Dk Ep Mec Gde 0001 Rev 1.0 Eng07 343 Xjbr Dgl 12 Hvac Systems_7_0

DK-EP-MEC-GDE-0001 rev 1.0

Design and Installation of AHU and HVAC Units

1.0

14/11/2014 Issued

Revision

Date

Notes Author: Focal point: Approved by: Approval Date:

Jan Brøgger Merete Gorry Jens Peter Stigkær See Meta Data

This document contains proprietary information information belonging to Maersk Oil and shall not be wholly or partially reproduced nor disclosed without prior written permission from Maersk Oil.

Printed versions of this document are uncontrolled, check GMS for latest version.

DK-EP-MEC-GDE-0001 rev 1.0 Page 2 of 26

Table of Contents

1

Introduction ...................... ................................. ...................... ....................... ....................... ...................... ....................... ................... ....... 5

2

Objective ...................... ................................. ....................... ....................... ...................... ....................... ....................... ...................... ........... 5

3

Scope.......................................................................................................... 5

3.1

General ...................... ................................. ...................... ....................... ....................... ....................... ....................... .................... ......... 5

3.2

Existing Facilities ...................... .................................. ....................... ...................... ....................... ....................... .................. ....... 5

3.3

Deviations ............................................................................................... 5

4

Terms and Definitions ....................... .................................. ....................... ....................... ...................... ....................... ............... ... 6

5

MOG References ..................... ................................. ....................... ...................... ....................... ....................... ...................... ............. .. 7

6

Regulations, Codes and Standards .......................... ...................................... ....................... ...................... ................. ...... 7

6.1

EU Regulations ..................... ................................. ....................... ...................... ....................... ....................... ...................... ........... 7

6.2

National Regulations ....................... .................................. ....................... ....................... ...................... ....................... .............. 8

6.2.1

Danish Energy Agency ................. ............................ ....................... ....................... ...................... ....................... .............. 8

6.2.2

Danish Safety Technology Authority Author ity ...................... .................................. ....................... ...................... ........... 8

6.3 7

International Standards ....................... .................................. ...................... ....................... ....................... .................... ......... 8 Technical Definitions ..................... ................................. ....................... ...................... ....................... ....................... .................. ....... 9

7.1

General ...................... ................................. ...................... ....................... ....................... ....................... ....................... .................... ......... 9

7.1.1

Actuator ...................... .................................. ....................... ...................... ....................... ....................... ...................... ............... .... 9

7.1.2

AHU .................................................................................................... 9

7.1.3

Coalescer/drip catcher ...................... .................................. ....................... ...................... ....................... ................... ....... 9

7.1.4

Fire damper........................ damper.................................... ....................... ...................... ....................... ....................... .................... ......... 9

7.1.5

Flow detector........................ detector.................................... ....................... ...................... ....................... ....................... .................. ....... 9

7.1.6

Fusible plug/link...................... .................................. ....................... ...................... ....................... ....................... ................ ..... 9

7.1.7

Gas detector....................... ................................... ....................... ...................... ....................... ....................... .................... ......... 9

7.1.8

HVAC .................................................................................................. 9

7.1.9

Non-return damper ....................... .................................. ...................... ....................... ....................... ...................... ........... 9

7.1.10

Relief damper ..................... ................................. ....................... ...................... ....................... ....................... .................... ......... 9

7.1.11

Speed detector ..................... ................................. ....................... ...................... ....................... ....................... .................. ....... 9

8

Design Principles ...................... .................................. ....................... ...................... ....................... ....................... ..................... ..........10

8.1 8.1.1 8.2

General ...................... ................................. ...................... ....................... ....................... ....................... ....................... ................... ........10 Environmental Conditions ...................... .................................. ....................... ...................... ....................... .............. ..10 Systems ................................................................................................. 10

8.2.1

Electrical Control Systems ..................... ................................. ....................... ...................... ....................... .............. .. 10

8.2.2

Hydraulic Control Systems................... Systems.............................. ....................... ....................... ....................... ................ .... 10

This document contains proprietary information information belonging to Maersk Oil and shall not be wholly or partially reproduced nor disclosed without prior written permission from Maersk Oil.



8.3

Pneumatic Signals....................................................................................11

8.3.1

Pneumatic Supply Level ........................................................................11

8.3.2

Pneumatic Signal Level .........................................................................11

8.4

Electrical Signals ......................................................................................11

8.4.1

General ..............................................................................................11

8.5

Common Protection Requirements..............................................................11

8.5.1

Ex Protection methods ..........................................................................11

8.5.2

Enclosure Material ................................................................................11

8.5.3

Enclosure Entries .................................................................................11

9

Ventilation Purposes.....................................................................................12

9.1

General ..................................................................................................12

9.2

Reclassification purpose ............................................................................12

9.3

Environmental purpose .............................................................................12

9.4

Process conditioning purpose .....................................................................12

10 Ventilation Components ................................................................................13 10.1

Materials.................................................................................................13

10.2

Construction............................................................................................13

10.3

Intake filtration .......................................................................................13

10.4

Coalescer ................................................................................................13

10.5

Filters.....................................................................................................14

10.6

Ventilation fans .......................................................................................14

10.7

Dampers.................................................................................................15

10.7.1

Non return dampers .............................................................................15

10.7.2

Relief dampers.....................................................................................15

10.7.3

Fire dampers .......................................................................................15

10.7.4

Actuated dampers ................................................................................17

10.8

Dehumidifying, cooling and heating ............................................................17

10.8.1

Dehumidifying and cooling ....................................................................17

10.8.2

Heating...............................................................................................17

10.9

Ducting ..................................................................................................18

10.10 Electrical.................................................................................................18 10.10.1

Certification.........................................................................................18

10.10.2

Termination interface............................................................................18

10.10.3

Fan motors.......................................................................................... 18

10.10.4

Heater ................................................................................................ 18

This document contains proprietary information belonging to Maersk Oil and shall not be wholly or partially reproduced nor disclosed without prior written permission from Maersk Oil.



10.11 Instrumentation.......................................................................................19 10.11.1

Certification.........................................................................................19

10.11.2

Termination interface............................................................................19

10.11.3

Filter detector ......................................................................................19

10.11.4

Speed detectors ...................................................................................19

10.11.5

Flow detector.......................................................................................20

10.11.6

Temperature control .............................................................................20

10.11.7

Fire & Gas control ................................................................................20

11 Test & commissioning...................................................................................21 11.1

Ducting ..................................................................................................21

11.2

Construction............................................................................................21

11.3

Intake filters ...........................................................................................21

11.4

Fan and motors .......................................................................................21

11.5

Dampers.................................................................................................21

11.6

Electrical.................................................................................................21

11.7

Instrumentation.......................................................................................21

12 Documentation ............................................................................................22 12.1

General Drawings ....................................................................................22

12.1.1

Piping and Instrument Diagrams (P&ID) ..................................................22

12.1.2

Cause & Effect (C&E) Diagrams ..............................................................22

12.1.3

Layout Drawings ..................................................................................22

12.1.4

Connection/Loop Diagrams ....................................................................22

12.2

Intrinsically Safe Loop ..............................................................................22

12.2.1

I.S. Calculations...................................................................................22

12.2.2

General ..............................................................................................22

12.3

Manufacturer Documentation.....................................................................23

12.3.1 12.4

FAT .................................................................................................... 23 Manufacturer Statements ..........................................................................23

12.4.1

Statement of Compliance ......................................................................23

12.4.2

Statement of Incorporation ...................................................................23

12.4.3

EC Declaration of Performance ............................................................... 23

13 Product References ......................................................................................24 14 Typical HVAC Diagram .................................................................................. 25 15 Typical Diagram for Cooling ..........................................................................26




1

Introduction

This guideline DK-EP-MEC-GDE-0001 defines the Maersk Oil DK requirements and recommendations for design and installation of AHU and HVAC Units on fixed platform installations. This guideline forms part of the overall Maersk Oil Guidelines (GDE). The GDEs are based on Maersk Oil Design Standard (MODES), Maersk Oil Technical Standards (MOTS), good engineering practice and on specified recognised Codes and Standards. This guideline specifies the following: a) International codes and standards to be used: b) Company requirements when these are different from or additional to the requirements of the codes and standards specified. c) Company recommendations based mainly on experience with existing installations and maintenance.

2

Objective

The objective of DK-EP-MEC-GDE-0001 defines the Maersk Oil DK recommendations for layout and principles for ventilation instruments, components and devices in order to provide consistent design across all new Company facilities with regards to safety, the environment, operability and maintainability

3 3.1

Scope General

The DK-EP-MEC-GDE-0001 should apply to all new installations, and to modifications and extensions to existing Company facilities offshore. The guideline should apply during all project stages including, but not limited to, conceptual, FEED, detailed design, procurement, construction and commissioning. FPSO´s are excluded from the scope of the DK-EP-MEC-GDE-0001. Reference is made to DK-EP-STD-0001, User Guideline, where other standards, relevant for preparation of documentation, are summarized.

3.2

Existing Facilities

When applying DK-EP-MEC-GDE-0001 in connection with modifications and extensions to existing Company facilities assessed according to other specifications, the user exercise engineering judgement necessary for ensuring compatibility with existing conditions, and ensure that the required safety is achieved. 3.3

Deviations

Request for substitutions or changes of any kind to the demands and recommendations detailed in this DK-EP-MEC-GDE-0001 where an alternative solution is subject to Company approval shall be made through a Technical Query (TQ) forwarded to Company. Request for deviations to Laws, Orders, Codes and Standards are not acceptable




4

Terms and Definitions

Any terms and definitions quoted in this section shall be also captured in the GMS Glossary of terms and conditions. Terms

Shall

Used to indicate that a provision is a requirement, i.e. mandatory

Should

Indicates that among several possibilities, one is recommended as particularly suitable, without mentioning or excluding others or that a certain course of action is preferred but not necessarily required. Other possibilities may be applied subject to agreement.

May

Verbal form used to indicate a course of action permissible within the limits of the guideline.

Abbreviations

AISI

American Iron and Steel Institute

API

American Petroleum Institute

ATEX

Atmospheres Explosible – explosive atmospheres

C&E

Cause & Effect Diagram

DOS

Documentations Standard

Ex

Explosion Protection

Ex-d

(Druckfest enclosure

Ex-e

(Erhöhte sicherheit) Ex Protection method by increased safety

Ex-i

(Intrinsic safety) Ex Protection method by limiting power to safe level

EN

European Standards (Europäische Norm)

ESD

Emergency Shutdown System

FAT

Factory Acceptance Test

F&G

Fire and Gas System

GDE

Guide Line for Design

H2S

Hydrogen sulphide – Very corrosive and extremely toxic gas

IEC

International Electrotechnical Commission

I.S.

Intrinsically Safe (Ex protection method)

IP

Ingress Protection

ISO

International Standards Organisation

MEG

Mono Ethylene Glycol

MCC

Motor Control Centre – Switchboard with control, protection and feedback signal circuitries for electrical motors

kapselung)

Ex

Protection

method

by

flameproof




MOTS

Maersk Oil Technical Standard

MODES

Maersk Oil Design Standard

NAMUR

Normenarbeitsgemeinschaft für Meß- und Regeltechnik in der Chemischen Industrie (Standards Committee for Measurement and Control Technology in the Chemical Industry) - Standard includes proximity switches

PCS

Process Control System

PSD

Process Shutdown System

P&ID

Piping & Instrument Diagram

PO

Purchase Order

SCADA

Supervisory Control And Data Acquisition (process control system)

5

MOG References

MOG-EP-INS-STD-0001

MOTS 01 - Instrument Materials and Installation

MOG-EP-ELE-STD-0010

MOTS 10 - Electrical Installations

DK-EP-INS-GDE-0002

Design and Installation of Field Instrumentation

DK-EP-SAF-GDE-0001

Design and Installation of F&G System and Field Equipment

DK-EP-STD-0007

Piping & Instrument Diagrams

6 6.1

Regulations, Codes and Standards EU Regulations

DIRECTIVE 92/91/EEC

concerning the minimum requirements for improving the safety and health protection of workers in the mineral-extracting industries through drilling.

DIRECTIVE 94/9/EC

on equipment and protective systems intended for use in potentially explosive atmospheres. (ATEX)

DIRECTIVE 2006/95/EC

on electrical equipment. (LVD)


on health and safety requirements regarding the exposure of workers to the risks arising from physical agents. (Noise)


on health and safety requirements regarding the exposure of workers to the risks arising from physical agents (Vibration)

REG 305/2011/EU

for the marketing of construction products.




6.2

National Regulations

6.2.1

Danish Energy Agency

Act No. 520

Act on Safety, etc. for Offshore Installations for Exploration, Recovery and Transport of Hydrocarbons (The Offshore Safety Act)

Order No. 831

Executive Order on Construction, Design and Equipment of fixed Offshore Installations and Pipelines.

Order No. 602

Executive Order on protection against Exposure to Noise in Relation to Work on Offshore Installations

Order No. 1332

Order on the design of technical Equipment and Protective Systems intended for Use in Potentially Explosive Atmospheres

Order No. 688

Order on marketing, sales and market surveillance of building materials

6.2.2

Danish Safety Technology Authority

Order No. 697

Order on Electrical Equipment and Electrical Protective Systems intended for Use in Potentially Explosive Atmospheres

Order No. 797

Order of electrical equipment designed for use within certain voltage limits

Order No. 12502

Heavy Current Order – Title 6 Electrical Installations

6.3

International Standards

EN/ISO 13702

Petroleum and natural gas industries - Control and mitigation of fires and explosions on offshore production installations

EN 60079 series

Equipment for use in potentially Explosive atmospheres

EN 13463 series

Non-electrical equipment for use in potentially explosive atmospheres

IEC 61892 – series

Mobile and fixed offshore units – Electrical installations

EN 60529

Degrees of Protection Provided by Enclosures

EN/ISO-15138

Petroleum and natural gas industries — Offshore production installations — Heating, ventilation and air-conditioning

EN 14986

Design of fans working in potentially explosive atmospheres

EN 15650

Ventilation for buildings - Fire dampers

EN 12097

Ventilation for Buildings – Ductwork – Requirements for ductwork components to facilitate maintenance of ductwork systems

EN 779

Particulate air filters for general ventilation




7

Technical Definitions

7.1

General

Many of the following definitions are a combination of abbreviations and terms especially used offshore. The definitions will therefore be somewhat explanatory. 7.1.1

Actuator

Component on damper converting electrical, pneumatic or hydraulic signal to mechanical movement of damper. 7.1.2

AHU

Air Handling Unit – Unit for technical purpose such as pressurising rooms or removal of heat from machinery. 7.1.3

Coalescer/drip catcher

Unit located in inlet of the ventilation system for removal of water humidity and droplets in the used air. 7.1.4

Fire damper

Automatic damper unit located where ventilation ducting penetrates fire r ated structure. Used for securing area in case of F&G emergency. 7.1.5

Flow detector

Components consisting of a flow sensor located in ventilation ducting and an associated amplifier located in F&G system. Used for securing air flow/over pressure in to the covered area. 7.1.6

Fusible plug/link

Component located on fire damper actuator signal line or on damper as a mechanical link Used for closing damper in case of local temperature increase. 7.1.7

Gas detector

Detector(s) located in ventilation intake ducting. Used for securing th at air used is nonhazardous. 7.1.8

HVAC

Complete unit performing Heating, Ventilation and Air Conditioning for a dedicated area. 7.1.9

Non-return damper

Mechanical damper unit allowing air to pass in flow direction and blocks for air flow in reverse direction. 7.1.10

Relief damper

Mechanical damper unit located at the outlet from the dedicated area. Used for adjusting the room pressure to a sensible value (Minimum 50 Pa – 5 mm W.G.) 7.1.11

Speed detector

Components consisting of a speed sensor located on ventilation fans and an associated amplifier located in the MCC that is supplying the fan motors. Used for detecting fan failure and participates in the control of fan motors.




8

Design Principles

8.1

General

Following chapter 8 is describing the common condition and principles for choice and design of instrument component, installation and methods with r egard to: 

Common physical conditions and to environmental conditions.



Common system conditions with regard to electrical, hydraulic and pneumatic systems. Conditions related to Ex safety, Enclosure protection and signal conditioning.



8.1.1

Environmental Conditions

For the general design of Instrument systems and enclosures covering process, utility and equipment areas, following environmental parameters can be used in the Danish part of the North Sea: Maximum wind speed

35 m/sec

Minimum outdoor ambient temperature

-10°C

Maximum outdoor ambient temperature

22°C

Maximum outdoor Humidity (Indoor*)

100%

Minimum indoor ambient temperature

15°C

Maximum indoor ambient temperature

35°C

Minimum indoor Humidity by HVAC

40%

Maximum indoor Humidity by HVAC

50%

It is recommended that the design manual for the field is frequented before design http://operations.maerskoil.dk/Doc/GD/DESIGNMANUAL/DUC%20FELTKORT_UK_APR.PD F 8.2

Systems

8.2.1

Electrical Control Systems

Commonly there are three electrical global facility control systems on a platform: The PCS system – Process Control System – (Also named SCADA: Supervisory, Control And Data Acquisition). The system is taking care of running the process and utility systems within normal parameters.



The PSD/ESD system – Process/Emergency Shut Down – (Also named ESD with levels named: ESD1 - ESD2 - ESD3 - ESD4).



The F&G system – Fire and Gas – The system is unlike SCADA and ESD not process related but facility related. While the two first are supervising and controlling the process, the F&G system will supervise and control hazardous situations (fire or gas release) on the facility. The F&G system is detailed described in DK-EP-SAF-GDE-0001



8.2.2

Hydraulic Control Systems

Hydraulic low pressure (LP) system for general purpose hydraulic power has design pressure of 207 barg. The working pressure range is minimum 90 barg and maximum 120 barg. PRV setting is 132 barg. Utility equipment (e.g. fire dampers) is locally controlled and supplied from LP system. This document contains proprietary information belonging to Maersk Oil and shall not be wholly or partially reproduced nor disclosed without prior written permission from Maersk Oil.



The distribution of Hydraulic oil control lines is normally provided via AISI 316 instrument tubing. 8.3

Pneumatic Signals

8.3.1

Pneumatic Supply Level

Pneumatic supplies for instruments/actuators shall be provided through a pressure regulator. It is important that pressure regulators are checked for setting of correct value according to the associated supplied instrument since many instruments are very sensitive, and may easily malfunction, if they are exposed to (too) high supply pressures. 8.3.2

Pneumatic Signal Level

Pneumatic signal are ranged 3-15 PSI or 0,2-1,0 Barg. This range is comparable with the electrically 4-20 mA signal. 8.4

Electrical Signals

8.4.1

General

Analogue input signals are normally performed as intrinsically safe (Ex-i) 4-20 mA DC for transmitters or Low voltage DC for Thermocouples and vibration/displacement sensors. Analogue output signals are normally performed as intrinsically safe (Ex-i) 4-20 mA DC for I/P converters on actuators. Digital input signals are normally performed as intrinsically safe (Ex-i) low voltage 7-10V for NAMUR sensors or intrinsically safe (Ex-i) 24 VDC for switches Digital inputs from control circuits e.g. switchgear, MCC etc. are standard NON-Ex signals. Digital outputs are standard NON-Ex signals to Ex-d certified equipment and to relays in switchgear, MCC etc. 8.5

Common Protection Requirements

8.5.1

Ex Protection methods

All electrical equipment shall be certified for Equipment Group II, Equipment Protection Category 2, Hazardous Category G, Apparatus Group II, Gas Group B, and Temperature Class T3, in accordance with IEC / EN 60079. All mechanical equipment shall be certified for Equipment Group II, Equipment Protection Category 2, Hazardous Category G, and Temperature Class T3 in accordance with EN 13463. 8.5.2

Enclosure Material

Electronic instrument enclosures shall generally be made of stainless steel AISI 316 and be IP rated according to demand in MOTS-01 and 10. It must be verified if outdoor installed instruments needs additionally shielding against Deluge and/or UV radiation. If an instrument is unavailable in AISI 316 version, the instrument can be protected by being installed in an AISI 316 enclosure and, if needed, provided with anti-condensation heater. 8.5.3

Enclosure Entries

All Ex-d enclosures shall be provided with Ex-e cable entry boxes, except for small components, including but not limited to, solenoid valves, alarm horns, lamps, etc. with an internal volume below 2000 cc. These smaller components can be provided with Ex-d certified and DELUGE proof metal glands. This document contains proprietary information belonging to Maersk Oil and shall not be wholly or partially reproduced nor disclosed without prior written permission from Maersk Oil.



Compound-filled Ex-d glands shall be avoided. Small sensors with embedded cable can be connected to boxes via Ex approved and flame resistant, Deluge proof (min. IP 66) polyamide g lands. DELUGE proof Ex-d metal gland

9

IP 68 Ex-e Polyamide gland

Ventilation Purposes

9.1

General

It must be noted that a HVAC/AHU can be installed for multiple purposes. 9.2

Reclassification purpose

The ventilation can be used for reclassifying an area from hazardous to non-hazardous area by purging the area with air taken from non-hazardous area. Ventilation intake shall be located minimum 3 meter from any zone 2 area and minimum 9 meter from any zone 1 area. The main reclassification conditions are - according to IEC 60079-13: 



9.3

The covered area shall have a min. air change of of 5 room volume per hour. The covered area shall have a pressure of min. 50 Pa (5 mm W.G.) above the outside classified area. Environmental purpose

The ventilation can be used for environmental purpose in order to secure correct temperature and humidity conditions for personnel and/or equipment inside the covered area by heating or cooling of the supplied air. 9.4

Process conditioning purpose

The ventilation can be used for securing conditions for material installed in the covered area. This can be: 





Removal of generated heat from equipment (E.g. turbines) Removal of gases (E.g. Hydrogen from batteries or leaks from fuel gas systems on turbines) Supply of air for combustion engines.




10

Ventilation Components

10.1

Materials

Unit frames shall be made of stainless steel AISI 316. Unit parts, such as: Dampers, filter units, fans, heaters, coolers, instrumentation shall be fabricated of stainless steel AISI 316L. Use of light alloys is not acceptable. Saltwater resistant alloys can only be used by obtained approval from COMPANY. 10.2

Construction

The ventilation unit shall be modular built in order to ease maintenance/exchange of parts. The unit shall be provided with inspection/maintenance hatches both with regard to access inside installed equipment and for cleaning. 10.3

Intake filtration

The ventilation air inlet shall be provided with: 

Louvre and Bird screen



Droplet/drip catcher



Coarse filter



Fine filter

10.4

Coalescer

The coalescer compartment shall be provided with dr ip tray. At the lowest point, the drip tray shall be provided with a 1” drain pipe with ball valve

located outside for interface to Company drain sy stem. A Coalescer with Louvre - Bird screen

Droplet Separator and Coarse Filter

–




10.5

Filters

The ventilation intake shall be provided with: 



A coarse filter class G4/EU4 for facilities such as: Process equipment, workshops and utility rooms. In addition to the coarse filter, a fine filter, class F8/EU8 for facilities such as: Accommodation, kitchen/pantry, living rooms, offices and switchgear rooms.

The filters shall be installed with regard to easy maintenance and with sufficient space to other components in order to prevent damage of filter material. Special attention must be taken by the distance to duct heater. Air Filtration Unit with Coalescer and Retractable Filter unit

10.6

Ventilation fans

Fans shall be spark proof certified. Fans shall be provided with pre-lubricated bearings for min. 40.000 hours of operation. Fans shall be directly driven by motor. Any kind of transmission between motor and fan such as V-belt or equal is not acceptable. If the protected area contains extract fans (Welding or laboratory facilities) the ventilation fan capacity shall be sufficient to maintain 50 Pa (5 mm W.G.) overpressure under extract fans running conditions. Typical Axial Fan used

Typical Twin

for a Turbine Enclosure

Centrifugal Fans for a HVAC Unit




10.7

Dampers

10.7.1

Non return dampers

Non return dampers shall be installed up and down stream of each fan for making maintenance / repair of one fan possible during operation of stand by fan. 10.7.2

Relief dampers

Mechanical adjustable relief dampers shall be installed in outlet ducting from protected area. The dampers shall be adjusted to provide a min. of 50 Pa pressure inside the covered area. Typical AISI 316 Non Return Damper

10.7.3

Typical AISI 316 Relief Damper

Fire dampers

Fire dampers shall be provided where ducting is penetrating fire rated structures. The fire dampers shall be certified to same fire rating as the structures. Actuated dampers are normally used as fire damper at inlets to covered area, where fire dampers at outlets can be combined with non-return or relief damper functions. It is preferable that fire dampers are located in the penetrated structure. If the fire damper is located next to the fire rated structure, the integrity of fireproofing must be maintained. This means that ducting between structure and fire damper and, in some cases, ducting upstream of fire damper must be approved to same fire rating as structure. All equipment (Including the fire damper) located in fire proof ducting must also maintain same fire rating. Actuated fire damper open operation shall be by: 24 VDC actuator or 24 VDC solenoid valve operating pneumatic actuator or 24 VDC solenoid valve operating hydraulic actuator. Fire damper close operation shall be mechanical fail to close by gravity or spring. Fire dampers shall be provided with manually operated closing switch/valve. Fire dampers shall be provided with a local fusible plug/link. By temperatures above 124 ° C, the fire damper shall close. Fire dampers shall be provided with position switches (Open/close) of proximity types. Fire damper operation and signalling shall be interfaced to the F&G system.




Typical AISI 316 Fire damper

Typically Control Diagram for Fire dampers

FIRE DAMPER

ACTUATOR

CL

OP

T°

FUSIBLE LINK

VENTILATION MANUAL RELEASE DUCTING

24 VDC FROM F&G

REGULATOR

AIR SUPPLY




10.7.4

Actuated dampers

Actuated dampers for natural ventilation purpose can be installed in rooms where the ventilation unit do not run continuously. Actuated damper open operation shall have two actuators/solenoids, one for SCADA operation and one for F&G operation. The F&G action shall override the SCADA action. All demands for fire dampers shall be fulfilled by actuated dampers.

10.8

Dehumidifying, cooling and heating

10.8.1

Dehumidifying and cooling

Dehumidifying of intake air and, if necessary, air cooling shall be performed by a cooler located in ducting on the HVAC unit. The HVAC duct cooler shall be operating on a MEG/water coolant mixture. The MEG system shall interface to the seawater cooling system and the refrigerant units via heat exchangers. The refrigerant unit shall operate on an environmental approved media such as NH3. The refrigerant unit shall interface to the sea water cooling system via a heat exchanger. See Drawing YYYY-11-00000-0002. 10.8.2

Heating

Heating after dehumidifying shall be provided as a central heater in the HVAC system. The central heater shall be provided with double protection against overheating and not be able to operate without ducting flow. Individual room temperature control shall be performed by local duct heaters provided with local manual temperature control, overheat control and low flow protection. Typical AISI 316 Heater Ex-d e approved




10.9

Ducting

All outside and HVAC inlet ducting shall be made of 3 mm stainless steel AISI 316L (A0). Ducting shall be provided with inspection/maintenance hatches both with regard to access inside installed equipment and for cleaning of duct. The location of inspection hatches/access panels shall be provided where: 1. Equipment is installed inside duct. 2. Where ducting change direction. 3. Min every 6 m. of straight run for cleaning of ducting.

10.10 10.10.1

Electrical Certification

All electrical equipment shall be certified to category 2 (Zone 1) and use protection method: Ex d/e. 10.10.2

Termination interface

All termination interfaces for electrical equipment shall be accessible from outside of the enclosure/ducting. 10.10.3

Fan motors

The motors can be one or two speed types depending of necessary air flow. If control of motor speed is performed by VSD, the motors shall be provided with temperature monitoring either by PT 100 or PTC resistors for each phase. Motors shall be provided with pre-lubricated bearings for min. 40.000 hours of operation. It shall be possible to control (Stop) the ventilation from outside the protected area. Local control stations for motors shall be located close to fan units and wired to MCC / switchgear. 10.10.4

Heater

Heating element must be provided with temperature control switch and safety switch. Trip of temperature safety switch on heater element must be clearly visible. Reset of temperature safety switch on heater must be accessible without use of tool.




10.11 10.11.1

Instrumentation Certification

All instrument or F&G equipment shall be certified to category 2 (Zone 1) and protection methods: Ex-i (preferred) or Ex-de 10.11.2

Termination interface

All cable interfaces to/from ventilation system/components shall be done in external located junction boxes. Interface cabling directly into internal located component is not acceptable.

10.11.3

Filter detector

Filters shall be provided with a filter detector (Differential pressure switch) with set point of 200 Pa. The filter detector shall be wired to the SCADA system for alarming.

10.11.4

Speed detectors

Each fan shall be provided with an electronic speed detector. The speed detector amplifiers shall be installed either in SCADA system which will interface with the fan motor control or installed directly in the MCC/switchgear supplying the fan motors. If the selected duty fan fails, the associated speed detector amplifier shall start up the stand by fan. Speed Sensor

Speed Amplifier

Amplifier Front




10.11.5

Flow detector

The inlet ducting to the protected area shall be provided with two independent flow detectors. The detectors shall be of the calometric type. The flow detector amplifiers shall be installed in the F&G system. The flow signal logic shall allow start up of fans and verify an air change of 5 room volume per hour before release of the protected area. A separate flow detector shall be installed for prevent start of heater or trip the heater in case of missing flow. Flow sensor

10.11.6

Flow amplifier

Temperature control

If the ventilation is used for temperature control, the covered area and the inlet ducting shall be provided with temperature transmitters wired to SCADA. The signals shall (Via SCADA) control ventilation heating/cooling. 10.11.7

Fire & Gas control

Inlet ducting from non-hazardous area shall be provided with three HC gas detectors. If the ventilation unit is located where risk of H 2S is present, the inlet ducting shall be provided with two H2S detectors. Ducting from ventilation unit to a protected area shall be provided with a smoke detector. Pressurised non-hazardous area shall be provided with a 90 dBA alarm for missing HVAC flow. In pressurised rooms where noisy equipment is installed, there shall also be a flashing lamp for missing HVAC flow.




11

Test & commissioning

11.1

Ducting

Ducting shall be controlled for vibration/noise during running of ventilation fans. All connections and maintenance hatches shall be leak tested. Record of airflow in covered area during running of fans. Record of pressure in covered area. 11.2

Construction

Accessibility to all parts shall be verified. Galvanic isolation between different metals shall be verified 11.3

Intake filters

Drip tray slope towards 1” drain shall be verified. Filter guard set point shall be verified. 11.4

Fan and motors

Motors shall be checked for correct rotation and power consumption shall be recorded. Speed guards shall be tested for correct functionality. By fail of running fan, the stand by fan shall start up. 11.5

Dampers

All dampers shall be checked for correct function. Fire dampers shall be fully tested with all functions. Actuated dampers shall be fully tested with remote indications. Non-return dampers to be tested during running and fan change over. Relief damper to be adjusted to min. 50 Pa pressure during fan running. Test of functionality between ventilation unit dampers and n atural ventilation dampers. 11.6

Electrical

Heaters shall be checked for correct function (Heater to be de-energised from both high temperature and from missing flow) and record of power consumption. 

Check of protective settings for motors and heater in MCC or VSD



Test of remote stop function.



Test of fan change over.



Cooling unit to be performance tested.

11.7 

Instrumentation

All signals shall be loop tested in order to verify and record all ranges and set points.



Test of speed detector function



Test of flow detector function.



Test of filter alarm.



Test of gas and smoke detectors




12

Documentation

12.1

General Drawings

Documentation of instrument systems shall generally follow Maersk Oil DOS. 12.1.1

Piping and Instrument Diagrams (P&ID)

All instruments shall be covered by piping and instrument diagrams. The function shall be clearly indicated as: F&G (F) – Safety (S) – Control (C) – Local (L) or indication (I). Reference is made to DK-EP-STD-0007, Piping & Instrument Diagrams. 12.1.2

Cause & Effect (C&E) Diagrams

The safety system logic shall be documented on Cause and Effect diagrams showing each input and its action on all outputs. All field inputs and outputs shall be documented with field tag number and software transferred signals with signal tag number. Cause & Effect diagrams are detailed described in DOS: DK-EP-STD-009 Change to Cause & Effect diagrams must be verified and accepted by third part. 12.1.3

Layout Drawings

The location of instrument system field equipment shall be documented on layout drawings covering all the areas of the platform. The layout drawings shall contain: 

Location of all instruments



Location of junction boxes

Reference is made to DK-EP-STD-0002, Engineering Drawings & Lege nds. 12.1.4

Connection/Loop Diagrams

The connection or loop diagrams shall show all connections from the field component via junction boxes to the barriers/isolators and finally ending up in the PCS/PSD/F&G system. 12.2

Intrinsically Safe Loop

12.2.1

I.S. Calculations

In the I.S. calculation, typical parameters such as: maxU – maxI – maxP – maxC – maxH and L/R ratio are compared between barrier/isolator and field equipment (component and cable) It must be noted that all components shall be documented with the electrical parameters from the Ex-i certificate, however simple apparatus may form part of an intrinsically safe loop without all parameters available. It must be noted that the Maersk Oil I.S. database already contains a huge amount of calculations for existing combinations of barriers/isolators and field components. 12.2.2

General

All intrinsically safety loops shall be verified and assessed for the electrical parameters of equipment such as barriers/isolators, field equipment and the interconnecting wiring in a descriptive system document. The descriptive system documents in which the items of electrical apparatus are listed are typically done as an I.S. calculation according to EN 60079-25: Intrinsically safe systems.




12.3

Manufacturer Documentation

12.3.1

FAT

The manufacturer of constructions / equipment shall execute a Factory Acceptance Test before delivery. The FAT shall be based on drawings upgraded to As Built status The FAT is normally supervised by Company and – depending of system – Third party. Survey during manufacture and participation in Factory Acceptance Tests (FATs) by the nominated certifying agency will normally be required for: 1. Safety related systems. 2. Non-standard instruments/components of welded construction for Piping Class 1 and 2 systems. 3. Ex certified panels with certified or non-certified equipment. 4. Panels with Ex certified equipment. 5. Units with safety related systems e.g.: Hydraulic wellhead power and PSD/ESD system, PA/GA system, High Integrity Pressure Protection System (HIPPS), LOS transmission 6. Hardware and software in safety systems (ESD - F&G) All FATs with Third party participation shall be documented in form of an inspection release note from the third party. 12.4

Manufacturer Statements

By receiving equipment or constructions/units it is important to verify that associated documentation is sufficient and complete. The manufacturer shall either make a statement of compliance or statement of incorporation depending of the equipment finishing status The statement shall list EU directive(s) to be complied with but also the harmonised standards that are (has to be) involved and complied with. 12.4.1

Statement of Compliance

By completed delivery of equipment, a “Statement of compliance” shall state the EU

directive(s) complied with. It must be noted that any modification made after equipment is received can invalidate the statement of compliance. It is therefore of major importance that any kind of equipment specific modification is verified and agreed by the manufacturer before execution. 12.4.2

Statement of Incorporation

By partial finished equipment (for incorporation in exi sting equipment) a “Statement of incorporation” shall be provided from manufacturer and shall inform of conditions to be

fulfilled by the completion part in order to comply with EU directive(s). The conditions have to be completed before the equipment can be p ut into safe operation. 12.4.3

EC Declaration of Performance

REGULATION (EU) No 305/2011 harmonised conditions for the marketing of construction products CHAPTER II DECLARATION OF PERFORMANCE AND CE MARKING Article 4 Declaration of performance 1. When a construction product is covered by a harmonised standard or conforms to a European Technical Assessment which has been issued for it, the manufacturer shall draw up a declaration of performance when such a product is placed on the market.




13

Product References

SECTION

PRODUCT

MANUFACTURER

8.5.3

Ex-d/e GLAND

HAWKE

8.5.3

Ex-e POLYAMIDE GLAND

STAHL

10.4

Coalesher

Halton

10.4

Filter

Halton

10.6

Axial fan

System Air

10.6

Centrifugal fan

Nyborg fan

10.7.2

Non return damper

Halton

10.7.2

Relief damper

Halton

10.7.3

Fire damper

Halton

10.8.2

Air Duct Heater

JEVI

Duct Access Hatch

Lindab

10.11.4

Speed Detector

Pepperl & Fuchs

10.11.5

Flow Detector

EGE Electronic

10.9




14

Typical HVAC Diagram

R E C S E L A

O C

R E P M A D E R I F

N R U T R E E R P N M O A N D

T I N U R E T L I F

G N I L L A N G I S

R L O T O I T R S T U I C R N R I Y O H C C T

R E W O P

M R A L A L A U S I V

D N E G E L

R E O K T C O E M S T E D

R O T T A C E E H T E D

- X E X S 1 X 0

- X E X X H 1 X 0

T C U D D E T T E A L C N I O L E 2 1 . N I R V 1 D R E V E E R E D L N O R D O A O O I D T O C T E D T D + G E E V R P I O T T D E R R A A R T C P D D I A S P P P H E E A U U T H D

G U L P E L E B V I S L U A F V

P P A

T T S S P P

R E L O O C R I A

R E T A E H R I A

E R V U O L

R E P

E E V L I B R A D I R D E A E V P S

M E A R D U F S S E I E L R E P R

Z H

- D N T A S A N R E E R E R E M A P T P I D M A U A E E Q D H S E F E I R R X I O U F E N - S N S G W E N O I O R N S D P T L O L N L U I A C H S

F

- X E X F X 1 0

F

- X E X X F 1 0

F

- X E X S X 1 X 0

L T R O I O R U T T C N O R I O M C C

E L M B R I A D U L A A

R O T C E T E D S A G

H C T I W S W O L F

F

- X E X G 1 X 0

L X L X S 1 F 0

L T A C U E N L A E M S

A 1 0 2 1 D N

W Y O F B L F O R R E P I I T A R A T E W H O L

M

B 1 0 2 1 D N

A 1 0 2 1 Y S

1 0 0 0 0 0 0 0 0 1 1 Y Y Y Y : o n g w D

e l t i T

X - X T T X 2 1

C

C

B A

C

B 1 0 2 1 M B

B 1 0 2 1 Y S

K S R Æ M

G N I W A R D L A C I P Y T C A V H

1 0 2 1 D F

O / X C X S X 2 Z 1

F

R B E D D I X F X E R I 2 E A L P U P 1 S G M T A S

- B E X S X 2 1

V 0 . 1 . E 2 1 1 F E R

S A G & E L I A L R E O N E K G S R Æ M

R Y I A L . P T P S U N I S

R E A D D I X E R F X E A I L 2 P U P 1 S G M T A S

B 2 0 2 1 D N

M

- X V X X O 1 S 0

L P O R M T E N T O C

A 2 0 2 1 D N

- A E X S X 2 1

D I O N E E V L L O A S V

M A E D T A S C Y S S

F

A 1 0 2 1 M B

D R A U G D E E P S

- X E X X 2 S 1

K C E H C N R R R R R W B B B B B J J J J J A X X X X X R D 1 - - 3 - 1 - 8 6 1 1 E R V 0 P 1 T O 0 - A N - - A - 6 5 1 2 D 1 2 1 2 5 0 W N C F P J

. . 0 v 2 e R

M T N O A O E O R H G F R N I O O D E E N K E S P O O E P M R S D U P

- X E X S X 1 X 0

E S O L C L A U N A M

F - X E X H X 1 X 0

S R E P M A D E R I F

Z H X X X 2 1 A U

W O M L R F A W L O A L

Z H

F

- X H X H X S 2 T 1

1 0 2 1 E H

T I N U G N I ) L D O E I O F C I C O E T P S N F O I I T ( C E N N O C

D E A S I E R R A U E S F S E A S R P

1 0 2 1 Y T

2 0 2 1 E

C

H X S X D X 2 P 1

1 0 2 1 T F

X X X 2 1 A

R A / E G C H C C T M I W S

1 0 2 1 E

R E T 8 L G I F / U E E N I F

- X E X G X X 1 0

M T O A N O E O R H G F N R I O O D E E N K E S P O O E P M R D S U P

X X 2 1 A T I N U C A V H

F

- X E X G X 1 X 0

1 0 2 1 T C

F

F

W O M L R F A W L O A L

F

F

R E T L I 4 F G E / S U

- X E X G X X 1 0

F

X

R E A O C

F

- X E X G X X 1 0

- X V X O X 2 S 1

- X E X S X 1 X 0

F - X E X H X 1 X 0

M R E T O S F S Y E S I L G P N I P L U O S O C

1 0 2 1 D R

1 0 2 1 C F

F

X O / X C S X Z 2 1

2 0 2 1 D F




15

Typical Diagram for Cooling

R O S S E R P T M I O N C U

T N E

M U R T S N I

M

R R E E T T A M M N Y A E E L R W T P W T U A S P A S T E Y U E Y E S S S S S R

L O R E T V N L O A C V

A I Y D T E L N P M P A R U G E M N S G E I I T L G R E F S O M E Y O R S C -

A I N D E R U M T E G R N I G L E O M O C -

. . 0 v 1 e R G N I L L A N G I S

R E W O P

T T

D N E G E L

1 V E R O T D E E T T A A D D P P U U

S T N N E O I D M T E M P V O I O C R R C P R S P O E A F D

T S P

T S P

P P A

K C W E C P H C N R R R R R W B B J B J B J B J J A X X X X X R D 3 1 1 - - 1 - 8 6 5 E R V 0 0 T P O 0 A N A 5 6 D 1 5 8 2 1 1 1 1 N F J

E V L A V K C O L B

R E S N E D T N I O N C U

P M U P

Y R E C T N E R E U V Q E N O R F C Z H

S A G & E L I A L R E O N E K G S R Æ M

V 0 . 1 . 1 0 0 B A E R

K S R Æ M

G N I W A R D L A C I P Y T G N I L O O C

e l t i T

2 0 0 0 0 0 0 0 0 1 1 Y Y Y Y : o n g w D

Y L P P U S R E T A W A E S

M L E E E T R N S U A Y T P S A L R G O E R N P I T L M N E O O T O C C

L O L T E R I T N N N A U P O C

C C M M O R F S E I L P P U S Z H

T T

Z H

M

T I N U C A V H M O R F

T T

T T



Dk Ep Mec Gde 0001 Rev 1.0 Eng07 343 Xjbr Dgl 12 Hvac Systems_7_0

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