PTS 13.42.01.pdf

PETRONAS TECHNICAL STANDARDS

Ex Equipment Selection Guideline (ELECTRICAL) (Ex ESG-E)

PTS 13.42.01 September 2013

© 2013 PETROLIAM NASIONAL BERHAD (PETRONAS) All rights reserved. No part of this document may be reproduced, stored in a retrieval system or transmitted in any form or by any means (electronic, mechanical, photocopying, recording or otherwise) without the permission of the copyright owner. PETRONAS Technical Standards are Company’s internal standards and meant for authorized users only.

PTS 13.42.01

EX EQUIPMENT SELECTION GUIDELINE (ELECTRICAL) (EX ESG-E)

September 2013 Page 2 of 20

FOREWORD PETRONAS Technical Standards (PTS) has been developed based on the accumulated knowledge, experience and best practices of the PETRONAS group supplementing National and International standards where appropriate. The key objective of PTS is to ensure standard technical practice across the PETRONAS group. Compliance to PTS is compulsory for PETRONAS-operated facilities and Joint Ventures (JVs) where PETRONAS has more than fifty percent (50%) shareholding and/or operational control, and includes all phases of work activities. Contractors/manufacturers/suppliers who use PTS are solely responsible in ensuring the quality of work, goods and services meet the required design and engineering standards. In the case where specific

requirements

are

not

covered

in

the

PTS,

it

is

the

responsibility

of

the

Contractors/manufacturers/suppliers to propose other proven or internationally established standards or practices of the same level of quality and integrity as reflected in the PTS. In issuing and making the PTS available, PETRONAS is not making any warranty on the accuracy or completeness of the information contained in PTS. The Contractors/manufacturers/suppliers shall ensure accuracy and completeness of the PTS used for the intended design and engineering requirement and shall inform the Owner for any conflicting requirement with other international codes and technical standards before start of any work. PETRONAS is the sole copyright holder of PTS. No part of this document may be reproduced, stored in a retrieval system or transmitted in any form or by any means (electronic, mechanical, recording or otherwise) or be disclosed by users to any company or person whomsoever, without the prior written consent of PETRONAS. The PTS shall be used exclusively for the authorised purpose. The users shall arrange for PTS to be kept in safe custody and shall ensure its secrecy is maintained and provide satisfactory information to PETRONAS that this requirement is met.

PTS 13.42.01



ANNOUNCEMENT

Please be informed that the entire PTS inventory is currently undergoing transformation exercise from 2013 - 2015 which includes revision to numbering system, format and content. As part of this change, the PTS numbering system has been revised to 6-digit numbers and drawings, forms and requisition to 7-digit numbers. All newly revised PTS will adopt this new numbering system, and where required make reference to other PTS in its revised numbering to ensure consistency. Users are requested to refer to PTS 00.01.01 (PTS Index) for mapping between old and revised PTS numbers for clarity. For further inquiries, contact PTS administrator at [email protected]

PTS 13.42.01



TABLE OF CONTENTS 1.0

2.0

3.0

INTRODUCTION................................................................................................................ 6 1.1

SCOPE ............................................................................................................................ 6

1.2

GLOSSARY OF TERM...................................................................................................... 6

1.3

SUMMARY OF CHANGES ............................................................................................... 7

ENGINEERING AND SELECTION GUIDELINES CRITERIA ....................................................... 8 2.1

GENERAL ....................................................................................................................... 8

2.2

ZONE ............................................................................................................................. 8

2.3

GAS GROUP ................................................................................................................... 9

2.4

TEMPERATURE CLASS ................................................................................................... 9

2.5

INGRESS PROTECTION................................................................................................. 10

2.6

EX EQUIPMENT FOR EMERGENCY SERVICES .............................................................. 10

2.7

EX MARKING ............................................................................................................... 10

2.8

SPARK PRODUCING DEVICES ...................................................................................... 10

2.9

EX PROTECTION BY PRESSURISATION ......................................................................... 10

2.10

CERTIFICATE REQUIREMENT ....................................................................................... 11

KEY EQUIPMENT GUIDELINES ......................................................................................... 12 3.1

MAIN POWER GENERATION AND COMPRESSOR PACKAGE ....................................... 12

3.2

BATTERY ...................................................................................................................... 13

3.3

POWER TRANSFORMER & TRANSFORMER RECTIFIER UNIT....................................... 13

3.4

DISTRIBUTION BOARD ................................................................................................ 13

3.5

JUNCTION/TERMINATION BOX ................................................................................... 14

3.6

SOCKET OUTLET .......................................................................................................... 14

3.7

RCU.............................................................................................................................. 14

3.8

MOTOR........................................................................................................................ 14

3.9

MOTOR OPERATED VALVE (MOV) .............................................................................. 15

PTS 13.42.01



4.0

3.10

LIGHTING..................................................................................................................... 15

3.11

NAVIGATION & AVIATION AID .................................................................................... 15

3.12

HVAC SYSTEM ............................................................................................................. 16

3.13

ELECTRICAL SUBMERSIBLE PUMP ............................................................................... 16

3.14

PROCESS HEATER ........................................................................................................ 16

3.15

ELECTRICAL HEAT TRACING ........................................................................................ 16

3.16

PORTABLE ELECTRICAL EQUIPMENT........................................................................... 16

3.17

LIFTING EQUIPMENT ................................................................................................... 17

3.18

MECHANICAL DRIVER.................................................................................................. 17

3.19

CABLE .......................................................................................................................... 18

3.20

BUS DUCT .................................................................................................................... 18

3.21

CONDUIT SYSTEMS ..................................................................................................... 18

3.22

CABLE GLANDS ............................................................................................................ 18

3.23

ELECTRICAL SUBSTATION/EQUIPMENT ROOM .......................................................... 19

3.24

BATTERY ROOM .......................................................................................................... 19

BIBLIOGRAPHY ............................................................................................................... 20

PTS 13.42.01



1.0

INTRODUCTION This PETRONAS Technical Standard (PTS) provides the minimum technical requirements for engineering and selection of electrical equipment to be utilized in hazardous areas. This PTS adopts an International Standards IEC 60079 as a supplement based on PETRONAS lesson learnt and best practices. Any clarification for deviation on the technical requirements specified in this PTS shall be obtained from the Technical Authority of PETRONAS.

1.1

SCOPE This PTS serve as a guideline for engineering and selection of electrical equipment to be utilized in hazardous areas for both upstream and downstream facilities of PETRONAS.

1.2

GLOSSARY OF TERM

1.2.1

General Definition of Terms& Abbreviations. Refer to PTS Requirements, General Definition of Terms & Reading Guide PTS 00.01.03 for General Definition of Terms & Abbreviations

1.2.2

Specific Definitions

No 1

Terms Certificate

2

Emergency lighting

3

Escape lighting

4

Ex Service Facility

5

Hazardous Area

Description Document issued by a recognized authority certifying that it has examined a certain type of apparatus and, if necessary, has tested it and concluded that the apparatus complies with the relevant standard. Lighting provided for use when the supply to the normal lighting fails. Part of the emergency lighting, which is provided to ensure that the escape route is illuminated at all material times. A service facility that has been assessed and approved by PETRONAS or certified by independent Ex Certification Bodies under IEC Ex scheme or OEM that have the required service facility including appropriate equipment, competent staff and procedures that the repair, overhaul or modification work complies to relevant IEC 60079 standards and requirements. An area in which an explosive gas atmosphere is or may be expected to be present in quantities such as to require special precautions for the construction, installation and use of electrical apparatus. NOTE:

6

Ignition Temperature

7

Non Hazardous Area

This applies equally to hazardous dust atmospheres.

The temperature at which a substance will begin to self- ignites. An area in which an explosive gas atmosphere is not expected to be present in quantities such as to require special precautions for the construction, installation and use of electrical apparatus.

PTS 13.42.01



8

Power Transformer

9

Repair

10

Switchgear

11

Uninterruptible Power Supply

12

Zone 0

13

Zone 1

14

Zone 2

A static piece of apparatus with two or more windings which, by electromagnetic induction, transforms a system of alternating voltage and current into another system of voltage and current usually of different values and at the same frequency for the purpose of transmitting electrical power. Action to restore a faulty apparatus to its fully serviceable condition and in compliance with the relevant standard. A general term covering switching devices and their combination with associated control, measuring, protective and regulating equipment, also assemblies of such devices and equipment with associated interconnections, accessories, enclosures and supporting structures, intended in principle for use in connection with generation, transmission, distribution and conversion of electric power. A source of electrical power which is backed up by a second (emergency) source of power, such as to provide a supply of electricity that may be interrupted for no longer than 0.5 ms. An area in which an explosive gas atmosphere is present continuously, or is present for long periods. An area in which an explosive gas atmosphere is likely to occur in normal operation. An area in which an explosive gas atmosphere is not likely to occur in normal operation and if it does occur, it will exist for a short period only.

Table1: Specific Definitions of Terms 1.2.3

Specific Abbreviations

No 1 2 3

Abbreviations EPL Ex OEM

Description Equipment Protection Level. Abbreviation which relate to equipment or facility that is suitable to be used in hazardous area. Original Equipment Manufacturer

Table 2: Specific Abbreviations

1.3

SUMMARY OF CHANGES This is a new PTS.

PTS 13.42.01



2.0

ENGINEERING AND SELECTION GUIDELINES CRITERIA

2.1

GENERAL There are two (2) main factors that need to be considered for selection of electrical equipment for use in hazardous area. i. ii.

Process and Environmental requirement Operation and Maintenance requirement

FACTORS/PARAMETER/CRITERIA

Ex Protection Requirement

Process & Environmental Zone

Zone 0: Equipment Protection Level (EPL) Ga/Da Zone 1: Equipment Protection Level (EPL) Gb/Db Zone 2: Equipment Protection Level (EPL) Gc/Dc

Gas Group

Matching Gas Group

Ignition Temperature

Temperature class to lower than Ignition Temperature of the gas present

Ingress Protection

Not less than IP54 for outdoor installation based on IEC 60079.

Operation & Maintenance Electrical Parameters

Electrical parameters such as voltage and current ratings shall be specified by the purchaser.

Equipment containing spark producing devices

Ex d, Ex nR, Ex o, Ex p type protection

Validity of Certification

For Ex e Motor repair / rewound, require manufacturers full winding information

Table 3: Requirement for Ex equipment selection. NOTE(S): For Zone 2 if Ex p is selected, Ex pz is preferred to avoid nuisance tripping due to temporary loss of pressurization .

2.2

ZONE Equipment Protection Level (EPL) shall be selected based on Hazardous Area Classification Zone.

PTS 13.42.01



Equipment located in Zone 0 shall comply to EPL Ga/Da. Equipment located in Zone 1 shall comply to EPL Gb/Db as a minimum, with EPL Ga /Da may be selected. Equipment located in Zone 2 shall comply to EPL Gc/Dc as minimum, with EPL Gb/Db and EPL Ga/Da may be selected.

Equipment Protection Level

ZONE 0

ZONE 1

ZONE 2

Ga/Da

√

√

√

√

√

Gb/Db

Gc/Dc

√

Table 4: Requirement for protection level selection.

2.3

GAS GROUP Equipment shall be selected to meet Gas Group in particular for Ex d and Ex i protection type. Different Gas group requires different energy level to cause ignition and also different magnitude of pressure developed as a result of explosion. However for increased safety and ease of equipment interchangeability as well as potential area classification changes overtime, equipment in all hazardous area should preferably to be suitable for Gas Group II C protection. Equipment marked Gas Group II could be used in any Gas Group under Group II but not under Group I. NOTE(S): group II equipment are not suitable for use in Group I (e.g. in mines).

2.4

TEMPERATURE CLASS Temperature class is selected based on the fo llowing: i. ii.

Lower than auto ignition temperature. Nature of the components; whether heat producing or non-heat producing components.

Examples: i. ii. iii.

Temperature class for motors located within Methane i.e. Gas Group IIA area with auto ignition temperature of 5270C should be T3 and T4. Temperature class for lighting located within Methane i.e. Gas Group IIA area with auto ignition temperature of 5270C should be T4. Temperature class for non-heat producing components such as switches and cable glands should be T6.

T1 and T2 temperature classes should be avoided.

PTS 13.42.01



2.5

INGRESS PROTECTION Ingress protection is selected based on: i. ii. iii. iv. i.

2.6

Exposure to liquids, solid particles and vibration. For example: directly exposed to rain, within shaded area or indoor installation. All outdoor termination requires IP56, whereas motor requires IP55. Equipment exposed to ocean splashes requires a minimum protection of IP56. Equipment submerged in water i.e. Electrical Submersible Pump (ESP), requires IP68. For equipment in dust environment, the minimum ingress protection is IP65.

EX EQUIPMENT FOR EMERGENCY SERVICES Ex equipment located within hazardous area for emergency services shall comply with zone 1 requirements. It shall include the following: i. ii. iii. iv.

Emergency lighting for safety escape and operational supports during emergencies (e.g. blackouts) Exit Sign Obstruction lights Navigational Aids

For offshore installations, all the above including in non-hazardous area shall be suitable for zone 1. UPS should be installed in room or otherwise it shall be suitable for Zone 1 .

2.7

EX MARKING The electrical apparatus shall be marked on the main part in a visible place. This marking shall be in compliance with IEC60079-0, eligible and durable taking into account possible chemical corrosion.

2.8

SPARK PRODUCING DEVICES Spark producing devices include switches, contactors, relays, fuses, capacitors etc. Spark producing devices shall not be housed within Exe and ExnA enclosure.

2.9

EX PROTECTION BY PRESSURISATION For Ex protection by pressurisation the selection of enclosure or room shall be based on the following: i. ii.

Zone 1:Ex px Zone 2:Ex pz

Upon loss of pressurisation, Expx equipment enclosure shall be automatically de-energized. However, only alarm is required to be provided for Expz. Upon gas detection, all non Ex equipment except emergency switchboard and UPS within Ex px and Ex pz room shall be automatically de-energized. Upon loss of pressurisation all non Ex equipment except emergency switchboard and UPS within Ex px room shall be automatically de-energized. However, only alarm is required to be provided for Expz room.

PTS 13.42.01



Ex px enclosure or room protection type shall not be selected for equipment located in Zone 2 as it would cause nuisance tripping upon loss of pressurisation.

2.10

CERTIFICATE REQUIREMENT

2.10.1 Ex-Complete Assembly Certification No equipment shall be installed without complete assembly certificates from approved certifying body, for example: i. ii. iii.

Ex Panel Ex Distribution Box Ex Motor with VSD

2.10.2 Air Gap Spark Free Certification. Rotating electrical machines with a rated output exceeding above 100kW shall have air gap spark free certification. This requirement includes motor with a duty type S1 and S2. As an option, the starting current of the machine is required to be limited to 300 % of rated current, (IN) or the machine design shall allow special measures to be applied during starting to ensure that its enclosure does not contain an explosive gas atmosphere at the time of starting. If complete assembly certificate is not available, then Ex de or Ex p motor shall be selected for VSD driven motor. NOTE(S): Any deviations e.g. Turbine generator package which is designed and constructed in compliance to Ex equipment selection but do not have a complete assembly certificate shall be technically assessed by the technical authority and addressed in MOC.

PTS 13.42.01



3.0

KEY EQUIPMENT GUIDELINES

3.1

MAIN POWER GENERATION AND COMPRESSOR PACKAGE This package is classified into three categories of sub equipment: i.

Prior to completion of purging

ii.

After completion of purging

iii.

External to enclosure

Separate lubrication system for compressor and driven equipment (i.e. compressor or pump) is preferred. However, for compression system where the motor and the compressor share the same lubrication system, dry gas seals shall be applied. 3.1.1

Prior to completion of purging All equipment within the enclosure that is energized prior to completion of purging shall meet Zone 1 or Equipment Protection Level Gb/Db. This includes equipment mounted on the enclosure. For examples: i.

Junction/Termination Box should be certified to Ex e.

ii.

Lube Oil Motor should be certified to Ex de.

iii.

Lighting should be crossreferred to section 4.10.

iv.

Extraction Fan Motor should be certified to Ex de.

NOTE(S): i.

For Ex de motor, “d” indicates the motor casing and “e” indicates the termination.

ii.

For pre-purge concept it is applicable only for rotating equipment having separate pre-purge fan

iii.

Field Instrumentation shall comply with PTS 32.31.00.32

iv.

Gas detection System shall comply with PTS 32.31.00.32

v.

Instrument control panel shall comply with PTS 32.37.20.10

For power generation system provided with block and bleed valve that will block the incoming fuel supply and bleed off the existing fuel within the system upon gas detection, may opt to comply to Zone 2 requirement i.e. EPL Gc/Dc if decided so by PSM/Process/HSE engineers responsible for the area classification. 3.1.2

After completion of purging All Equipment within the package that is possibly energized after completion of purging may be non Ex or normal type of equipment. For examples: i.

Turbine or Compressor Driver Motor

ii.

Alternator

The extraction/ventilation fan is specified to dilute possible gas release from the fuel control valve to a minimum level of 25% Lower Explosive Limit (LEL).

PTS 13.42.01



3.1.3

External to enclosure All components external to the enclosure either related or non-related to the Package shall: i.

Meet Zone 2: Equipment Protection Level (EPL) Gc/Dc if area outside the enclosure is classified as Zone 2. Zone 2 is selected due to possible source of release from the fuel gas flange or from external equipment which are not related to main power generator and compressor packages. For example, Power Junction Box which is located externally should already be Ex e certified.

ii.

Non Ex if the area outside the enclosure is classified as non-hazardous area. Non-hazardous area due to no source of release from the fuel gas flanges (if flange connection is fully welded) or from external equipment (not related to main power generator and compressor packages). For gas engine generator, whenever possible the fuel gas pressure is to be limited to 4 bars in order to have non Ex Equipment to be used. In the event that the fuel pressure is more than 4 bars, the equipment components shall be certified to zone 2 while block and bleed valve and gas detection system shall be provided unless no possible source of release is being assessed and ensured. Diesel generator should be located in non-hazardous area and the equipment components should be non Ex unless the diesel temperature is more than 50 OC. For diesel generator located in hazardous area, it should comply with the area classification. Microturbine Generator (MTG) should be located in non-hazardous area. If unavoidable, the MTG certified to zone 2 shall be specified.

3.2

BATTERY For battery bank with dedicated enclosure, the complete assembly should be certified to Ex e or Ex de.Isolation switch or breaker for battery banks shall be certified to Ex d.

3.3

POWER TRANSFORMER & TRANSFORMER RECTIFIER UNIT Power Transformer, Transformer Rectifier Unit and its associate equipment should be located in Non-Hazardous Area. For transformer to be located in hazardous area, it has to be assessed case by case, subject to principal’s approval and managed through MOC if completed assembly certification cannot be obtained.

3.4

DISTRIBUTION BOARD Distribution Board in hazardous area shall be certified for complete assembly. Recommended type of protection should be certified to Ex de (“d” for compartment containing spark producing components and “e” for termination.) or Ex d.

PTS 13.42.01



3.5

JUNCTION/TERMINATION BOX Junction/Termination Box which does not contain any spark producing components shall be at least to comply with Ex e protection type. Ex d junction boxes cable entries shall be pre-drilled by the Ex certified manufacturers in order to ensure the validity of existing certification is maintained.

3.6

SOCKET OUTLET Socket outlet should be certified to Ex de.

3.7

RCU RCU should be certified to Ex de.

3.8

MOTOR

3.8.1

Motor Less than 500KW i.

For Zone 1, Ex de motor should be installed.

ii.

For Ex de, the motor construction shall be Ex d while the motor terminal box shall be certified to Ex e. For Zone 2, ExnA motor is highly recommended. Ex nR motor is not recommended due to challenges of maintaining “r estricted breathing” properties, especially due to aging and frequent repair activities.

iii.

Avoid Ex e Ex e motor’s thermal overload hot curve is required to comply with te which possibly may be overlooked during the breaker selection and relay setting. Ex e motor being repaired/rewound without compliance to manufacturer winding information will generally invalidate existing Ex certification. In the event that Ex e motor is being selected, the tripping time (based on the hot curve) of the motor thermal overload protection shall be faster than the marked time t Ε.

3.8.2

Motor 500KW and above. i.

Ex de motor should be the base case for Zone 1 and ExnA motor for Zone 2. However, Ex p motor may be considered if Ex de and Ex nA are not available in the market. There is overall commercial advantage after taking consideration of the Ex p panel cost and instrument air system to be provided.

ii.

For Zone 1, Expx motor should be installed. Ex px motor will automatically trip on low pressure detection. Due to this characteristic (tripping on low pressure), Ex px motor shall not be used in Zone 2. Otherwise, it will create unnecessary nuisance tripping.

iii.

For Zone 2, Expz motor should be installed. The selection of Expz gives advantage in terms of cost. However the disadvantage is that it adds to extra maintenance activity in maintaining the integrity of the pressurization control.

PTS 13.42.01



3.9

MOTOR OPERATED VALVE (MOV) For Zone 1 and 2, MOV selection shall be Ex d for the motor and Ex e for terminal box.

3.10

LIGHTING

3.10.1 Process Lighting Lighting in Zone 1 shall comply with EPL Gb/Db requirement, typically of Ex de protection type. Lighting in Zone 2 shall comply with EPL Gc/Dc requirement, typically of ExnA protection type. Ex nR should be avoided because it will add extra maintenance activities in order to ensure the “restriction breathing” property is maintained. 3.10.2 Perimeter Lighting Lighting in Zone 1 shall comply with EPL Gb/Db requirement typically of Ex e combined with Ex q and Ex mb i.e. Ex e mb q or combined with d to become Ex de. Lighting in Zone 2 shall comply with EPL Gc/Dc requirement, typically of ExnA protection type. Ex nR should be avoided because it will add extra maintenance activities to ensure “restriction breathing” property is maintained. For optimization purposes, the practical location of the lighting pole ought to be at the nonhazardous area. Thus avoiding the installation of expensive Ex lighting. 3.10.3 Emergency Lighting Emergency/Escape lighting specified within Zone 1 to meet EPL 2 standard requirement, typically of Ex e combined with Ex q and Ex mb i.e. Ex e mb q or combined with d and ib to become Ex de and Ex de ib Emergency lighting should be provided with self-contained battery pack instead of central. 3.10.4 Emergency Exit Sign Lighting Emergency exit sign lighting in Zone 1 and Zone 2 requirement is typically of Ex e combined with Ex ib and Ex mb i.e. Ex e ibmb. 3.10.5 Floodlight Floodlight lighting in Zone 1 and Zone 2 should comply with Ex de. 3.10.6 Helideck Lighting CAP 437 requires helideck lighting to comply with at least EPL Gc/Dc minimum standard i.e. Zone 2. Typically helideck lighting should be certified to Ex de. However fundamentally, helideck lighting does not require Ex protection type as helideck shall be located in non-hazardous area and helicopter shall not land in the event of beacon is activated i.e. detection of fire and gas system. Thus, consent from Aviation Authority need to be sought by project team prior to making final decision.

3.11

NAVIGATION & AVIATION AID Navigation aid is meant to be operating at all conditions including for emergency purposes and shall be of EPL Gb/Db.

PTS 13.42.01



3.11.1 Marine Lantern and Fog Signal/Horn Marine lantern and fog signal/horn should be certified to Ex de or Ex ed. 3.11.2 Aviation Obstruction Light Aviation Obstruction Light should be certified to Ex de or d. 3.11.3 Beacon Beacon should be certified to Ex d or de. 3.11.4 Sounder Sounder should be certified to Ex d or de.

3.12

HVAC SYSTEM Generally, the HVAC system is located in non-hazardous area and does not require Ex protection type. In the event it is located within the hazardous area, it should comply with the previously classified Ex protection selection. Ducting passing through hazardous area shall be gas-tight and properly sealed.

3.13

ELECTRICAL SUBMERSIBLE PUMP Down hole electrical submersible pump does not require Ex protection as it is above Upper Flammable Limit regions.

3.14

PROCESS HEATER Process heater terminal box should be certified to Ex e, Ex d or Ex de. The panel should be located within non-hazardous area. Whenever the above is not practical and the panel is located in hazardous area, it should be certified to Ex de or Ex d.

3.15

ELECTRICAL HEAT TRACING Heat tracing terminal box should be certified to Ex e or Ex d. The panel should be located within non-hazardous area. Whenever the above is not practical and the panel is located in hazardous area, it should be certified to Ex d or Ex de. Heat tracing tape should be Self-Limiting Self Regulating (SLSR) type.

3.16

PORTABLE ELECTRICAL EQUIPMENT All portable electrical equipment to be used in Zone 1 or Zone 2 area shall be certified to EPL Gb/Db. Risk assessment shall be carried out in case of the following: i.

Use of non Ex equipment in hazardous area

ii.

Use of any Ex equipment certified for EPL Gc/Dc

PTS 13.42.01



iii.

Use of any Ex equipment certified for EPL Gb/Db or Gc/Dc in Zone 0

Typical certification for the following portable equipment is: i. ii. iii. iv. v. vi. vii. viii.

Torch Light – Ex e ib Hand Lamp – Ex d Fiber Optic Inspection Light –EExed Multimeter- Ex e ib or Ex ib Insulation Resistance Tester – Ex ia Infrared Temperature Detector – Ex nC Personal Digital Assistant – Ex ia Laptop – Ex ib

NOTE(S):

3.17

i.

All equipment brought by the contractors shall comply with hazardous area requirements.

ii.

2) Any deviation (e.g. welding machine, habitat, pumps etc.) shall strictly adhere/monitor to comply with Hot work Permits requirements.

LIFTING EQUIPMENT All lifting equipment (e.g. pedestal crane, gantry crane, overhead crane, monorail hoist etc.) including auxiliary (e.g. cabin air conditioning, instrumentation & metering, control console, lighting, pendant control unit etc.) in hazardous zone shall comply as minimum to the zone and gas group ignition temperature and IP requirement specified. Slip ring assembly for pedestal crane located within hazardous area shall be certified to Ex d protection type.

3.18

MECHANICAL DRIVER Mechanical driver such as Gas Turbine and Engine in all areas shall be designed in such way that the surface temperature of any exposed part shall be at least 20% below the Auto Ignition Temperature (AIT) under all operating conditions including initial post shutdown periods. This could be achieved by means of appropriate cooling system or gas tight insulation to ensure the surface temperature shall be at least 20% below the Auto Ignition Temperature. Vendors have to demonstrate compliance with this r equirement. Gas detector shall be provided inside the room as well as at the inlet of the ventilation system to detect the presence of gas either from external or due to leakage of fuel gas system. In addition, double block and bleed valve shall be provided in the fuel system to cut off the incoming fuel supply in the event of gas detection inside the room and vent off the remaining fuel. Ventilation system has to be adequately sized with redundancy in accordance to IEC 6007913 .Inlet and exhaust shall be taken from non-hazardous area. NOTE(S): i.

Gas engine operating at pressure less than 4 bar is not considered as a source of release.

ii.

Surface temperature means temperature accessible by hazardous gas.

PTS 13.42.01



3.19

CABLE As minimum, cable for hazardous area installation shall comply with IEC60332. Fire and Safety related system shall comply with IEC60331. Power cable from main power generation to the transformer shall be of fire retardant type. Similarly Ex e cable gland and junction boxes to be selected as the external area of the enclosure in Zone 2 houses localized fuel source from the flange connection. Power connection between the transformer and switchgear should either be using cable complying with IEC60332 or bus-duct.

3.20

BUS DUCT For bus duct joints, terminations and heaters, it has to comply with Ex e. In case of unavailability of Ex certified product, it has be to assessed case by case and managed through Management Of Change.

3.21

CONDUIT SYSTEMS Conduit should be avoided wherever possible. However, whenever conduit is used, it shall be provided with stopping boxes where it enters or leaves a hazardous area and adjacent to enclosures to maintain the appropriate degree of protection (e.g. IP54) of the enclosure. Where the conduit system is used as the protective conductor, the threaded junction shall be suitable to carry the fault current which would flow when the circuit is appropriately protected by fuses or circuit breakers. After cables are installed in the conduit, stopping boxes shall be filled in accordance with manufacturer’s instructions with a compound w hich does not shrink on setting and is impervious to, and unaffected by, chemicals found in the hazardous area.

3.22

CABLE GLANDS For cable gland selection, the following needs to be considered: i.

Application Cable gland selection shall be based on the type of cable used: a) Gland with fire retardant sealing compound for corrugated cable application. b) Gland with sealing ring or compound filled seal for armoured and braided cables. c) Gland for non-armoured and non-braided cables. d) Special gland for heat tracing cables.

ii.

Protection Type The protection type for the gland shall be selected based on the equipment protection type to which the gland is connected.

PTS 13.42.01



For Ex d enclosure, to use Ex d or Ex de gland shall be used. For application in IIC location and/or zone 1 area, Ex d enclosure containing ignition source, shall use Ex d barrier gland with compound filled seals around the individual cores. For Ex e enclosure, Ex d, Ex de, or Ex e gland shall be used. iii.

Cable Size Cable gland has to be selected based on manufacturer’s selection table that corresponds with the cable size and outer and inner diameter tolerance.

NOTE(S):

3.23

i.

Final gland selection has to be verified according to the actual cable purchased.

ii.

Adaptors shall be limited to only one change in thread size. (E.g. Adaptors of 25/32 is allowed while 25/40 is not allowed).

iii.

Sealing plug shall not be used with adaptor.

ELECTRICAL SUBSTATION/EQUIPMENT ROOM The electrical substation/equipment room shall be located in non-hazardous area. In the event that it becomes impossible to locate the electrical substation/equipment room within non-hazardous areas, all openings (doors, ventilations, etc.)shall be positioned in nonhazardous area and more than 2 meters away from the hazardous area boundaries. Any electrical substation/equipment room with openings (doors, ventilations, etc.) within 2 meters from the hazardous area boundary shall be pressurized for the entire building, has air locked entrance passage and equipped with gas detection system at inlet of the air pressurization system. Upon triggering of the gas detection system, all incoming supplies shall be cut off and UPS and HVAC shutdown automatically. The cable entries to the electrical substation/equipment room shall use Multi Cable Transit (MCT) to provide gas tight sealing. The HVAC systems (if required to pressurize the room) shall be as minimum complying with Equipment Protection Level (EPL) Gc/Dc including requirements in IEC60079-13.i.e. Ex pz for zone 2 and Expx for zone 1 in particular minimum rate of air changes and pressure requirement.

3.24

BATTERY ROOM Battery room shall not have adjoining door with Non-Ex Electrical Equipment room and shall not have any adjoining ducting between battery room and non-Ex room. Battery room shall be equipped with redundant ventilation system to provide the necessary air change and cooling. For the existing installation in which the battery room has adjoining door or ducting with non Ex electrical room, then gas detection shall be provided inside the battery room if the total capacity of vented batteries exceeds 20,000 V Ah. For unmanned facilities, upon gas detection within the room, the battery breaker shall be tripped and thus stopping further hydrogen release except for battery supplying Public Address General Alarm (PAGA) System wherever possible. For manned facilities, only the alarm shall be triggered.

PTS 13.42.01



4.0

BIBLIOGRAPHY In this PTS, reference is made to the following Standards/Publications. Unless specifically designated by date, the latest edition of each publication shall be used, together with any supplements/revisions thereto:

PETRONAS TECHNICAL STANDARDS Index to PTS

PTS 00.01.01

Requirements, General Definition of Terms, Abbreviations & Reading Guide

PTS 00.01.03

INTERNATIONAL STANDARDS Equipment - General Requirements

IEC 60079-0

Explosive Atmosphere - Equipment Protection by flameproof enclosure 'd'

IEC 60079-1

Explosive Atmosphere - Equipment Protection by pressurized enclosure 'p'

IEC 60079-2

Explosive Atmosphere - Equipment Protection by powder filling ‘q’

IEC 60079-5

Explosive Atmosphere - Equipment Protection by increased safety 'e'

IEC 60079-7

Explosive Atmosphere - Equipment Protection by intrinsic safety 'i'

IEC 60079-11

Explosive Atmosphere - Equipment Protection by pressurized room 'p'

IEC 60079-13

Explosive Atmosphere - Electrical Installations Design, Selection and Erection

IEC 60079-14

Explosive Atmosphere - Equipment Protection by type of protection 'n'

IEC 60079-15

Explosive Atmosphere - Equipment Protection by encapsulation ‘m’

IEC 60079-18

International Electro technical Vocabulary

IEC 60050

PTS 13.42.01.pdf

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