Piping Study Drums

TRAINING MANUAL- PIPING PIPING STUDY DRUM PIPING

Uhde India Limited

DOC No No. : 29040-PI-UPS-1002 Rev.

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CONTENTS Page 0.0

Cover Sheet

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List of drawings

2

1.0

General

3

2.0

Types of Drums

3

3.0

Location of Drums

4

4.0

Nozzle Locations

4

5.0

Platform Arrangements

5

6.0

Piping Arrangements

5

Applicable Revision: Prepared:

Checked:

Approved:

Date: First Edition: R0 Prepared: AKB

Date:

Date:

Checked: TNG

Approved: RUD

Date: File Name:

Date: Server:

Date: VKO: KUMUS 209

PUNE: KUMUS 207

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TRAINING MANUAL- PIPING PIPING STUDY DRUM PIPING

Uhde India Limited

SR.NO. DWG.NO.


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DESCRIPTION

1

DP1

TYPICAL VERTICAL COMPRESSOR SUCTION DRUM.

2

DP2

TYPICAL HORIZONTAL REFLUX DRUM

3

DP3

NET POSITIVE SUCTION HEAD ELEVATION REQUIREMENTS FOR A HORIZONTAL DRUM

4

DP4

ELEVATION REQUIREMENTS FOR AN AN UNDERGROUND DRUM

5

DP5

TYPICAL LEG SUPPORTED DRUM

6

DP6

TYPICAL SADDLE SUPPORTED DRUM

7

DP7

TYPICAL LUG SUPPORTED DRUM

8

DP8

TYPICAL DRUM ELEVATION

9

DP9

TYPICAL PROCESS VESSEL SKETCH FOR A HORIZONTAL DRUM

10

DP10

PREFFERED NO NOZZLE LO LOCATIONS FO FOR A HORIZONTAL DR DRUM

11

DP11

TYPICAL PLATFORM ARRANGEMENT FOR A HORIZONTAL DRUM

12

DP12

TYPICAL PL PLATFORM ARRANGEMENT FO FOR A VERTICAL DR DRUM

13

DP13

TYPICAL DRUM PLATFORM ARRANGEMENTS

14

DP14

15

DP15

16

DP16

TYPICAL PUMP SUCTION ARRANGEMENT

17

DP17

TYPICAL RELIEF VALVE SYSTEMS

18

DP18

TYPICAL DRUM PIPING ARRANGEMENT

19

DP19

DRUM LOCATION IN A TOW ER REFLUX SYSTEM

20

DP20

LOCATIONS FOR FEED SURGE AND COMPRESSOR SUCTION DRUMS

21

DP21

TYPICAL PIPING AND INSTRUMENTATION DIAGRAM

22

DP22

TYPICAL INSTRUMENT VESSEL SKETCH

23

DP23

TYPICAL INSTRUMENT AR ARRANGEMENT

24

DP24

TYPICAL HORIZONTAL DRUM DAVIT ARRANGEMENT

25

DP25

TYPICAL DRUM BOOT LAYOUT

TYPICAL PLATFORM AND LADDER ELEVATION REQUIREMENTS FOR A HORIZONTAL DRUM TYPICAL PLATFORM FLOOR SPACE AREA REQUIREMENTS FOR A HORIZONTAL DRUM













TRAINING MANUAL- PIPING

Uhde India Limited

PIPING STUDY DRUM PIPING


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1.0

GENERAL

1.1

The process vessels and drums are cylindrical hollow vessels used in process plants as intermediate containers. They are are often used to provide surge volumes for liquid-vapour separations on distillation columns or separating mixtures mixtures of immiscible liquids. Other uses are flash drums, condensate and other process liquid collectors and holding drums for additives and chemicals.

1.2

The piping study on drums shall consider the general requirements for drum plant layout and provide information required to locate nozzles, instruments, piping and controls for platforming and operation / maintenance access.

1.3

In the first study of plot plan, platform levels and details of vessel elevations are set from process requirements (net positive suction head - NPSH, gravity feed, barometric legs etc.) and from considerations of access for safe and convenient operation and maintenance. Methods of supporting supporting vessels and operating operating platforms are detailed. Access for lifting equipment or overhead hoists and trolley beams is arranged for removal of motors, mixers and internal heat exchangers from process vessels. A platform should always always be provided for the removal of such heavy items of equipment and for access to manholes, sight glass, light glass etc.

1.4

The mechanical design of the drum may be carried out once the methods of support have been determined and nozzle nozzle sizes and positions positions are finalised However, economic piping layout and access to valves and nozzles also depend upon the position and orientation of vessel nozzles which may be repositioned to give a better layout. Horizontal drums may be supported on saddles positioned about one-fifth of the drum length from each T/L of the drum. Vertical drums may be supported on 3 or 4 legs or skirts considering the size and load of the equipment.

1.5

In absense of any specific process requirement, the drum should be located at a minimum height height depending on the the valves and fittings that are are below the drum. Platforming should be kept to the minimum necessary to provide safe and suitable access to manholes and operating valves.

1.6

A typical vertical drum and horizontal drum are illustrated in sketches DP-1 and DP-2. DP-2.

2.0

TYPES OF DRUMS

2.1

Drums are categorised as horizontal or vertical drums. Drums internals are normally demister pads, baffles, vortex breakers and distribution piping. Steam drums and deaerators are usually proprietory items. items. Knock-out drums are used to separate condensate in the the relieving discharges before going to the the flarestack. Headers to flare stacks from relief and blowdown valves and vents are run first to knockout drum. It is recommended that the lines should run overhead to the top of the drum and must slope at minimum 1:400 so that all condensate drain into the drum. The leg-supported drum is illustrated in sketch DP-5. DP-5. The saddle supported drum is illustrated in sketch DP-6. DP-6. The lug-supported drum is illustrated in sketch DP-7. DP-7.














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2.2

A typical process vessel sketch of a horizontal drum is illustrated in sketch DP-9. DP-9. The preferred nozzles locations on a horizontal drum is illustrated in sketch DP-10. DP-10.

3.0

LOCATION OF DRUMS

3.1

Drums are located within a process unit either adjacent to related equipment (e.g. the reflux drum) or as a stand alone unit (e.g. a condensate collection drum) When operating within process sequence of related items (e.g. pumps, condensers and towers) the drum should be positioned to facilitate an orderly and economic piping interconnection between itself and those items.

3.2

Within a conventional inline process unit, drums and their related items are generally located on either side of a central piperack serviced by auxilliary roads for m aintenance access. In certain cases (e.g. flash drums and deaerators), drums can be located above the the piperack. In chemical plants, drums are located at all levels of enclosed or open structures. Sketch DP-19 illustrates location of a reflux drum and sketch DP-20 illustrates a typical location of a feed surge drum and compressor suction drums.

3.3

Similar to towers, drum elevations are dictated by the NPSH (as illustrated in sketch DP-3) DP-3)

3.4

Drums for chemical collection systems are generally located below ground level inside concrete pits as illustrated in sketch DP-4. DP-4.

3.5

To locate a drum, the following information to be collected so that the level of drum drum can be finalised. Drum dimensions Type of heads Support details NPSH requirements of pump Bottom outlet size Minimum clearances Location A typical drum elevation view is illustrated in the sketch DP-8. DP-8.

4.0

NOZZLE LOCATIONS

4.1

The following information is required to position the drum nozzles. Process vessel sketch (Refer illustrations in sketch DP-9 & DP-10) DP-10) Instrument vessel sketch Piping and Instrumentation diagrams Plant layout guidelines Nozzle schedule or summary Insulation requirements Unit Plot Plans

4.2

Sketch DP-10, DP-10, illustrates the preferred nozzle locations on horizontal drums. The preferred location for level instrument is away from the turbulence at the liquid outlet nozzle. Instrument nozzles shall be located in the quiet zone of the vessel ie. on the opposite side of the weir or baffle or near the vapour outlet.














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The relief valve should be placed at a point on the top of the drum where the access platform can also provide access to other valves connected to the top of the drum. The pressure connection should be placed in the vapour space at the top of the drum, so that the face of the pressure gauge is visible from the ground or platform. The temperature connection is usually close to the bottom outlet, pointing towards the access aisle or platform. Manholes can be positioned at the top, at the side or at one end of the vessel. Steam-out connections should be located at the end opposite to the maintenance access with additional vent in the bottom section of the drum as steam has a lower molecular weight. The vent connection should be located in the top section of the drum at the end opposite the steam out connection. The drain should be located in the bottom section of the drum.

5.0

PLATFORM ARRANGEMEN MENTS

5.1

A platform with good guard railings is necessary for access if the manhole is more than 3.5 m above grade.

5.2

Platforms on drums are required for access to valves, instruments, blinds and maintenance accesses.

5.3

Sketch DP-11, DP-12, DP-13, DP-14, DP-15 illustrates some of the typical platform requirements for drum piping.

5.4

Platforming should be kept to the minimum necessary necessary to provide safe and suitable access to manholes and operating valves.

6.0

PIPING AR ARRANGEMENTS

6.1

Piping for process drums should be arranged in conjunction with nozzle locations, platform arrangements and the drums location to related equipment. Piping should be positioned to facilitate the installation of supports with sufficient flexibility to absorb any excessive stresses during operation. Piping for tall vertical drums should be arranged according to the guidelines mentioned in the piping study for column piping.

6.2

Sketch DP-16, DP-17, DP-18 illustrates some typical piping arrangement around drums.

6.3

Relief valves open to atmosphere on low elevated horizontal or vertical drums should be positioned to allow the discharge discharge piping to be routed routed to a convenient and and safe location. Closed system relief valve should be located at a convenient platform adjacent to the drum above the relief valve header.

6.4

Normally, the liquid or vapour inlet is at the top and at one end of of drum with liquid outlet outlet on the bottom and vapour outlet at the top at opposite end.














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6.5

Drain and vent lines may be located centrally or at the ends if the the drum drum is horizontal and if desired, desired, the drain valve may be placed at the low point of the outlet piping.

6.6

Horizontal drums should always have small slopes towards the drain points.

6.7

Level, pressure and temperature instruments are used to control the operation of the drum and should be in a position for optimum operation and maintenance.

6.8

Level controllers, switches and gauges are either located individually or grouped from a common bridle or stand pipe. The controller must be operable operable from grade or a platform, switches, gauges gauges and pressure / temperature connections may be operable from a ladder if no platform is available at the required elevation.

6.9

The fixed saddle shall be on the same side of the vessel as the pump suction nozzle. In case of requirement of an emergency isolation valves, these valves shall be located directly on the vessel nozzle. The position of the support shall allow for the installation installation of the valve and its actuator. actuator.

6.10

In order to gain gain access for maintenance maintenance and and operations operations purpose, purpose, level transmitter transmitter (LT) and Level indicator (LT) nozzles shall be arranged on either side of the access ladder with their centres 400mm from the ladder centerline.

6.11

All instruments shall be grouped on vessels and drums such such that that the minimum number of ladders ladders and platforms is required, without any compromise on accessibility.















TRAINING MANUAL - PIPING

DOC NO. : 29040-PI-UPS-1002


Uhde India Limited

Rev.

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TYPICAL VERTICAL COMPRESSOR SUCTION DRUM

VAPOUR OUTLET

DEMISTER PAD VAPOUR IN BAFFLE

HIGH LIQUID LEVEL (HLL)

MAINTENANCE ACCESS

LEVEL INSTRUMENTS














DOC NO. : 29040-PI-UPS-1002


Uhde India Limited

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TYPICAL HORIZONTAL REFLUX DRUM

T U O R U O P A V

N I D I U Q I L

HIGH LIQUID LEVEL (HLL)

MAINTENANCE ACCESS

LEVEL INSTRUMENTS

T U O D I U














Uhde India Limited


DOC NO. : 29040-PI-UPS-1002 Rev.

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NET POSITIVE SUCTION HEAD ELEVATION REQUIREMENTS FOR A HORIZONTAL DRUM

C L OF DRUM

PUMP

D A E H C I T A T S

GRADE LEVEL














Uhde India Limited


DOC NO. : 29040-PI-UPP-1002 Rev.

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ELEVATION REQUIREMENTS FOR AN UNDERGROUND DRUM

PUMP

DRUM

HOLDING DOWN STRAP















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TYPICAL LEG SUPPORTED DRUM

DIA.

H T G N E L . T S

T H G I E H G E L

















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TYPICAL SADDLE SUPPORTED DRUM

1/5 L

3/5 L

1/5 L

INSIDE RADIUS + 355 MIN. INSIDE RADIUS + 585 MAX.

° 3 0

REINFORCING PAD SADDLES















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TYPICAL LUG SUPPORTED DRUM

DIA.

H T G N E L














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TYPICAL DRUM ELEVATION

SLOPE

0 0 9

0 0

0 0 6

C 103.750 L














DOC NO. : 29040-PI-UPS-1002


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TYPICAL PROCESS VESSEL SKETCH FOR A HORIZONTAL DRUM

3050 E

A

P

B

MIN.

MIN.

L1 0 2 2 1 . A I D

HLL (HIGH LIQ. LEVEL) 0 1 6

LLL (LOW LIQUID LEVEL) 0 5 4

L2

MIN. F

MA

T

D














DOC NO. : 29040-PI-UPS-1002


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PREFERRED NOZZLE LOCATIONS FOR A HORIZONTAL DRUM

1/2 FLANGE DIAMETERS + 4" /100 MIN. (TYPICAL) A

B

VAPOUR OUT L

E

D + 5" D+125 MIN (TYP.)

P

LIQUID/ VAPOUR IN ALTERNATIVE MAINTENANCE ACCESS LOCATIONS

WEIR

F

L T

T

VORTEX BREAKER SADDLES

D CHECK

MA
















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TYPICAL PLATFORM ARRANGEMENT FOR A HORIZONTAL DRUM

ALTERNATIVE TOP HEAD PLATFORM DESIGN














Uhde India Limited

PIPING STUDY DRUMPIPING


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TYPICAL PLATFORM ARRANGEMENT FOR A VERTICAL DRUM














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TYPICAL DRUM PLATFORM ARRANGEMENTS

TOP HEAD PLATFORM SUPPORTED FROM TRUNNIONS

SUPPORTED FROM CONCRETE PIERS

SUPPORTED FROM TRUNNIONS














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TYPICAL PLATFORM AND LADDER ELEVATION REQUIREMENTS FOR A HORIZONTAL DRUM

VENT, INSTRUMENT, BLIND AND VALVE ACCESS

STEP-THROUGH LADDER RUN 10'-0"/3M MAX.














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TYPICAL PLATFORM FLOOR SPACE AREA REQUIREMENTS FOR A HORIZONTAL DRUM

2'-6" MIN./ 750

VENT PRESSURE INSTRUMENT
















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TYPICAL PUMP SUCTION ARRANGEMENT














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TYPICAL RELIEF VALVE SYSTEMS














Uhde India Limited

PIPING STUDY DRUMPIPING


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TYPICAL DRUM PIPING ARRANGEMENT














Uhde India Limited


DOC NO.: 290 40-PI40-PI-UPSUPS-100 100 2 Rev.

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DRUM LOCATION IN A TOWER REFLUX SYSTEM

N














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LOCATIONS FOR FEED SURGE AND COMPRESSOR SUCTION DRUMS
















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