DGS 0000-021 REV 1_June 2011
-
Upload
manojjuvali -
Category
Documents
-
view
195 -
download
6
description
Transcript of DGS 0000-021 REV 1_June 2011
Rev.
DGS 0000 021 1
Page
2 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
TABLE OF CONTENTS
1. GENERAL .......................................................................................................................................................................
1.1 INTRODUCTION........................................................................................................................................................ 3 1.2 PURPOSE ................................................................................................................................................................. 3 1.3 DEFINITIONS ............................................................................................................................................................ 3
2. CODES AND STANDARDS ........................................................................................................................................ 4
3. REFERENCE DOCUMENTS ..................................................................................................................................... 4
4. GUIDELINES FOR P&ID DEVELOPMENT ........................................................................................................... 5
4.1 GENERAL ................................................................................................................................................................ 5 4.2 INSTRUMENTATION ................................................................................................................................................. 5 4.3 PIPING ..................................................................................................................................................................... 7 4.4 PUMPS INSTALLATION ............................................................................................................................................. 8 4.5 SLOPING REQUIREMENTS ........................................................................................................................................ 8 4.6 VENTS AND DRAINS ................................................................................................................................................ 8 4.7 MISCELLANEOUS ..................................................................................................................................................... 9
5. TYPICAL REPRESENTATION DETAILS ............................................................................................................... 9
6. APPENDICES/ATTACHMENTS ............................................................................................................................... 9
APPENDIX 1: TYPICAL BATTERY LIMIT ARRANGEMENTS ................................................................................. 10 APPENDIX 2: DRAINS’ REPRESENTATION FOR VARIOUS SYSTEMS ................................................................. 16 APPENDIX 3: CRITERIA FOR CONTROL VALVE SIZE OF BOTH BLOCK AND BYPASS .................................... 17 APPENDIX 4: DOUBLE VALVE REQUIREMENTS ..................................................................................................... 18 APPENDIX 5: VENTS AND DRAINS FOR PUMPS ...................................................................................................... 19 APPENDIX 6: SELECTION TABLE FOR SPECTACLE BLANK, PADDLE SPACER/ BLANK ................................. 21
Rev.
DGS 0000 021 1
Page
3 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
1. GENERAL
1.1 Introduction
This specification outlines the criteria for standardization of the design and representation philosophies to be used during P&ID development for the ABU DHABI GAS INDUSTRIES LTD. (GASCO).
1.2 Purpose
The purpose of this document is to define the minimum requirements and general criteria for the preparation and development of P&IDs. . This document is intended to be a continually developing document and to be updated based on ENGINEER and COMPANY‟S discipline specialist‟s experience. All updates shall be submitted to the COMPANY for review and approval prior to implementation in accordance with PROJECT COMPANY procedure
ENGINEER shall review this document and highlight any conflicting requirements documented elsewhere.
1.3 Definitions
Where used in this specification, the following terms shall have the meanings indicated below unless otherwise clearly indicated by context of their use.
COMPANY - ABU DHABI GAS INDUSTRIES LTD. (GASCO)
CONTRACTOR - The party which carries out all or part of the design engineering, procurement, construction and commissioning or management of the PROJECT.
MANUFACTURER / VENDOR – The party(s) which manufacture(s) and/or supply(s) the material/ equipment, and provides technical documents / drawings and services to perform the duties specified by COMPANY / CONTRACTOR
CONCESSION REQUEST - A deviation requested by the CONTRACTOR or VENDOR, usually after receiving the contract package or purchase order. Often, it refers to an authorization to use, repair, recondition, reclaim, or release materials, components or equipment already in progress or completely manufactured but which does not meet or comply with COMPANY requirements. A CONCESSION REQUEST is subject to COMPANY approval.
LICENSOR - The party(s) which provides the technology and the basic design package for the engineering, procurement, construction, commissioning of the PROJECT.
PROJECT - (To be defined)
SHALL and SHOULD - The word „Shall‟ is to be understood as a mandatory and the word „Should‟ as strongly recommended to comply with the requirements of this document.
ENGINEER / FEED ENGINEER - An Engineering Company / firm appointed by COMPANY to perform The Front End Engineering Design (FEED) and / or Engineering Design for the PROJECT.
Definitions:
MCR – Main Control Room
600# - 600 pound rated line
900# - 900 pound rated line
ANSI - American National Standards Institute
ESD- Emergency Shutdown (system)
Rev.
DGS 0000 021 1
Page
4 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
TSO – Tight Shut off
PSV - Pressure Safety Valve
FAG - Acid Gas Flare
FL - Flare
GD - Glycol Drain
CD -Closed Drain
OD - Open Drain
SDM -Solvent Drain, MDEA
FO = Fail Open control valve
FC = Fail Close Control valve
2. CODES AND STANDARDS
The following codes and standards, to the extent specified herein shall apply. Where a specific edition is not indicated, it shall be taken that the most current edition (including addenda) shall apply.
AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME)
ASME B16.5 Pipe Flanges and Flanged Fittings
AMERICAN PETROLEUM INSTITUTE (API)
API STD 520 Sizing, Selection, and Installation of Pressure-relieving Devices in Refineries,
Part I - Sizing and Selection,
Part II, Installation
API STD 521 Pressure-relieving and Depressuring Systems
3. REFERENCE DOCUMENTS
The following reference documents, to the extent specified herein, form a part of this specification. When an edition date is not indicated for a document, the latest edition in force at the time of contract award shall apply.
Design General Specifications:
DGS-1511-032 Instrument Design Criteria
DGS-1543-002 ESD And On/Off Valves
DGS-1511-042 Flow Instruments
DGS-1511-041 Flow Elements And Meter Runs
DGS-1300-010
DGS-1300-040
Piping Systems (Piping Classes)
General Piping – Process and utility design, layout and drawing
Rev.
DGS 0000 021 1
Page
5 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
4. GUIDELINES FOR P&ID DEVELOPMENT
4.1 General
1. All isolation valves should be single block valves, except:
ANSI Class 600# and higher for fluids in sour service .
ANSI Class 900# and higher for all services, except PSV's downstream block valves.
Double valving shall be in accordance with Appendix 4.
2. Battery Limits should be defined based on Plot Plan considerations. Each unit or processing area should be a distinct battery limit.
3. Air Coolers
Air coolers fans motors shall be remotely controlled with a local start/stop ground level switch and stop switch located near fan motor and shall be shown as such on P&ID.
Air coolers shall be stopped from MCR.
4. Pumps
All pumps can be stopped from control room and locally.
Pump status should be displayed on the DCS for main pumps
Pumps could be started locally and/or from control room after COMPANY has checked pump status. As a guideline, pumps with automatic start-up shall be able to be started from control room. Other pumps should be considered on a case-by-case basis with prior consultation with COMPANY depending on process considerations.
All spare pumps shall have the option of automatic start-up facility unless otherwise advised by COMPANY. Automatic start-up is subject to detailed operational & safety review.
5. No vent / drain are allowed to atmosphere in hydrocarbon service except for remote area “where no flare and/or drain systems available”.
6. Special consideration should be given to the installation of spool pieces between large bore valves In order to facilitate safe removal of one without the removal of the other where DGS allows.
4.2 Instrumentation
1. Safety/Relief Valves
PSV's should be spared on the n+1 basis (n required for the service + 1 identical spare), except for those PSV's mounted on equipment which can be taken out of service for PSV maintenance (typical example: 3 50% filters with fire case PSV's should be equipped with one PSV per filter). Thermal expansion relief valves should not be spared. Such non spared PSV's should not be equipped with an inlet block valve.
All inlet and outlet block valves to PSV's should be full port valves (type in accordance with the service). Inlet and outlet block valves of PSV's in service should be locked open. Inlet block valve of spare PSV should be locked closed; outlet block valve should be locked opened.
Block valves with locking devices shall be covered by a note on the P&ID. For more details see Specifications DGS-1300-040
Blinding provision shall be included for each set of PSV's including the by-pass. This should be in the form of a spacer ring or spectacle blind on the nozzle of the protected equipment when the set of PSV's is directly mounted on equipment. A note should be added on P&ID in such case.
Each set of PSV's should be equipped with a 2" by-pass with single globe valve for low-pressure service and gate/ball + globe valve for high-pressure services (see appendix 4). The bypass valve(s) shall not be locked.
Rev.
DGS 0000 021 1
Page
6 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
PSV's should be fitted with a vent between block valve and inlet flange. To the maximum possible extent, downstream block valves and PSV's should be installed flange to flange (in that case without vent).
Block valves downstream PSV's should be gate valves.
For flow lines, PSV should be located upstream of the first blocking device in the flow line segment and should not be set higher than the rated working pressure of the segment
2. ESD valves:
ESD valves should be tagged XV, while sequence valves (if any) should be tagged KV. Critical valves positions (XV/KV) should be performed through position switches. No use of position transmitter should be done.
3. ESD valves TSO requirements should be identified during FEED, Tightness of ESD valves shall be as per DGS 1543-002. Wherever applicable they should be provided with a pressurization by-pass. The by-pass should be an XV, working automatically with the ESD valve status signal (ESD valve limit switch open signal should close the XV bypass valve). If the XV is fitted with a spectacle blind or spacer ring, then by-pass line should be equipped with a spectacle blind (irrespective of line size).
A differential pressure transmitter should be used as a permissive to open the ESD valve on high pressure services.
Under NO circumstances shall control valves be used as ESD valves. Where ESD valves
are deemed necessary, they shall be independent on/off type initiated by the COMPANY
via the ESD system.
4. Shut down systems should be equipped with dedicated field sensors.
5. Voting logic for ESD valve actuation shall be based on the recommendations of the Safety Integrity Level (SIL) Studies conducted for the PROJECT
6. Control Valves
Control valves should be equipped with a by-pass manifold as dictated by Process reasons. Block and by-pass valves, by-pass lines should be sized following the guide lines included in Appendix 3.
Except for specific cases, the following drains/vents should be provided:
for FO valves on both liquid and gas services, one vent/drain upstream valve,
for FC valves on both liquid and gas services, one vent/drain on each side of the valve.
Vents and drains should be connected to relevant networks.
7. Control valves with by-pass should not be equipped with hand-wheels, unless it is required for process reasons.
8. All flow measurement shall be evaluated for suitable flow meter considering better accuracy, calibration range & maintenance free operation requirement. .Flow measurement in flare headers shall be by use of ultrasonic meters. For more details see Specifications DGS 1511-042 and DGS 1511-041.
9. Level Gauge shall cover the full range of level control transmitters and safety transmitters. Glass type level gauges shall not be used in hydrocarbon or a toxic service, Magnetic type level gauges is preferred. Standpipes should not be specified in dirty services and for interface measurement.
10. All drain connections from level measuring instruments should be connected to most appropriate collection system for good housekeeping and when in sour service to the flare for environment protection requirement. Details showing the possible arrangements should be prepared by the ENGINEER for COMPANY review and approval.
Rev.
DGS 0000 021 1
Page
7 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
11. All Thermo wells (TW's) shall be fitted with Temperature Indicators (TI's). Lines smaller than 4" should be locally enlarged to 4" if a TW installation is required
12. All Battery Limit Process and Main Utilities “except for non continuous utilities streams” flow measurement should be pressure and temperature compensated. Pressure and temperature compensation for some other flow measurements should be evaluated and added as required or if instructed by COMPANY.
4.3 Piping
1. Ball valves shall be used for shut-off services in gas and hydrocarbon systems.
2. Butterfly valves shall not be used for isolation of equipment irrespective of leakage class.
3. Full port valves (type in accordance with the service) should be used at compressors and turbine inlet. Use of pipe reducers should be avoided for the same services.
4. Block valves shall be motorized for sizes greater or equal to 16" where frequent use is expected and / or for stand-by equipment.
5. No globe valves larger than 6" should be used. Reduced port ball valves should be used instead, except for specific Process requirements.
6. Steam out connection should not be hard piped, except for large capacities requiring more than the flow supplied by one or two steam hoses.
When hard pipe connection is provided, it should be fitted with double block valve, bleed and blinding provision.
7. Battery Limit valves should be manual valves. When an ESD valve is supplied at plant inlet and/or outlet Battery Limit, it should be supplemented by a manual BL valve. Refer to Appendix 1 for details.
8. The following guidelines should be used for specifying blinds for equipment isolation:
Positive isolation shall be provided by a spectacle blind or a spacer / spade depending on the line size rating in accordance with Appendix 6: Selection Table for Spectacle Blank, Paddle Spacer/Blank. For more details see Specification DGS 1300-010
above 12 ": spacer rings
Drain lines may not be fitted with spectacle blinds at equipment flange provided that the drain lines are equipped with spectacle blinds.
Safety valves‟ nozzles when installed on the equipment should be fitted with spacer ring, irrespective of the nozzle diameter. A specific note should be added on the P&ID.
9. The following minimum guidelines should be followed for pressurization by-pass sizes:
1 “ by-pass for valves below and including 14"
1.5” for valves above 14"
Isolation valves should be provided with a pressurization bypass for all services with flange rating of 300# and above”
Bypass valves provided at battery limit or at equipment for warm-up purpose shall be minimum 2” in diameter.
10. Minimum pipe size for steam and Nitrogen from distribution headers to utility station and connectors shall be 2”.
Rev.
DGS 0000 021 1
Page
8 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
4.4 Pumps Installation
1. Pumps should be equipped with suction and discharge pressure gages or pressure indicators. Suction gage to be installed downstream the suction strainer.
Suction valve and piping between this valve and the suction nozzle shall be the same rating of the discharge piping of the pump.
2. Pumps discharging in a common network should be equipped with a recirculation by-pass on the discharge check-valve for
viscous fluids, or fluids which may solidify at minimum ambient temperature,
cryogenic fluids, or considerably below ambient temperature,
high temperature services (over 230°C).
Check valve bypass should be in 1" for valves below or equal to 14" and 1.5" for larger sizes.
3. Block valves diameters for suction and discharge lines are defined below, in function of pumps nozzles diameters:
Suction line : in all case, valve size is equal to suction line diameter.
Discharge line : line size is one diameter higher than nozzle, check valve and block valve should have the same size than as the line size.
If difference between line size and nozzle size is greater than one diameter, check valve and block valve should be of the lowest possible intermediate size (e.g.: nozzle 4", line 10", check and block valves: 6").
4.5 Sloping Requirements
1. Sloping requirements shall be indicated on P&ID.
2. Flare headers shall slope towards the flare drum. Except for specific cases, PSV's discharge should slope to the flare headers/sub headers. Connection to the header should preferably be at 45° angle for lines greater or equal to 2".
3. Compressors suction lines should preferably slope to the suction KO drum. Compressors anti-surge lines should preferably slope to suction and discharge drums with anti-surge valve at high point.
4.6 Vents and Drains
1. In addition to drainage to dedicated drain network, when applicable, all drains are to be equipped with a drain to the water drain through an open cup.
2. Depending on line size, utilities header should be equipped, either with a blind flange or with a cap fitted with a 3" valve and blind flange. 2" valves with blind flanges shall be installed at the end of flare headers and sub headers for Nitrogen purging.
3. Steam vents used for long duration during start-up phases should be equipped with silencers. Individual vents shall be connected to its dedicated single silencer; grouping of vents to a single silencer is not permitted. PSV's on steam system should not be equipped with silencers.
4. For steam turbines, open drain traps and vents shall be provided for draining of steam condensate during start-up phases (until quality is achieved).
5. 3/4" vents and drains should be differentiated. The following is suggested:
V1: vent, 3/4", gate valve (1)
V2: vent, 3/4", globe valve (1)
V3: vent, 3/4", ball valve (1)
Rev.
DGS 0000 021 1
Page
9 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
D1: drain, 3/4", gate valve (1)
D2: drain, 3/4", globe valve (1)
D3: drain, 3/4", ball valve (1)
(1) With plug or blind flange, according to piping class.
4.7 Miscellaneous
Sample connection should be shown as simplified on the P&ID. Specific P&ID should be developed to show sample connection details (line size and numbers, valve types, etc). The minimum connection size is 3/4".
Sample connections shall be located at grade unless stairway access is provided. Ladder access to sample connections is not acceptable
5. TYPICAL REPRESENTATION DETAILS
Typical representation should be developed and shown on the symbol P&ID for the following items:
Standpipes, showing drains and valving as required,
Valves such as XV, KV and MOV's, showing the instrument loop details.
6. APPENDICES/ATTACHMENTS
Following Appendixes provide typical guidelines:
Appendix 1 - Typical Battery Limit Arrangements
Appendix 2 - Drains Representation for Various Systems
Appendix 3 - Criteria for Control Valve size of both Block and Bypass
Appendix 4 - Double Valve Requirements
Appendix 5 - Purge for Filters and Pumps Suction
Appendix 6 - Selection Table for Spectacle Blank Paddle Spacer/Blank.
Notes:
Symbols and legends used in Appendixes are just for presentation however PROJECT‟s Symbols and legends shall be used during PROJECT phases
Rev.
DGS 0000 021 1
Page
10 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
APPENDIX 1: TYPICAL BATTERY LIMIT ARRANGEMENTS
a. General
The simplest battery limit arrangement is shown below for gases and liquids. It includes block valve, spectacle blind or spade per line size and vent and / or drain
When the out coming line is connected to a common header (e.g. Sales Gas), a check valve should be added to prevent backflow in case of a single train shut down.
Note 1:
Ø =1" for line < 4"
Ø = 2" for line 4" to 8"
Ø =3" for line > 8"
GAS LINES
TO UNIT
MIN.
BL
3/4"
OR
GAS LINES
FROM UNIT
MIN.
BL
3/4"
OR
LIQUID LINES
TO UNIT
NOTE 1
OR
MIN.
BL
LIQUID LINES
FROM UNIT
NOTE 1
OR
MIN.
BL
Rev.
DGS 0000 021 1
Page
11 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
b. Specific Cases
1. HP Sour Gas and HP Sour Liquid (ANSI Class 600# or more)
For HP Sour Gas and HP Sour Liquid (ANSI Class 600# or more) with XV valve at the Battery Limit, refer to the following schemes for incoming and outgoing lines.
FL
XV
HP SOUR GAS INLET
BL
MIN.
MIN.
XV
MIN.
PIPING CLASS
/ INSULATION / FLUID
CODE BREAK
PIPING CLASS
/ INSULATION / FLUID
CODE BREAK
V3 PURGE
CDOD
3/ 4"
FL
XV
HP SOUR GAS OUTLET
BLMIN.
XV
MIN.
PIPING CLASS
/ INSULATION / FLUID
CODE BREAK
PIPING CLASS
/ INSULATION / FLUID
CODE BREAK
V3
CDOD
3/ 4"
Rev.
DGS 0000 021 1
Page
12 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
2. HP Sweet Gas and HP Sweet Liquid (ANSI Class 900# or more)
For HP Sweet Gas HP Sweet Liquid (ANSI Class 900# or more) with XV valve at the Battery Limit, refer to the following schemes for incoming and outgoing lines.
FL
XV
HP SWEET GAS INLET
BL
MIN.
MIN.
XV
MIN.
PIPING CLASS
/ INSULATION / FLUID
CODE BREAK
PIPING CLASS
/ INSULATION / FLUID
CODE BREAK
V3 PURGE
CDOD
3/ 4"
FL
XV
HP SWEET GAS OUTLET
BLMIN.
XV
MIN.
PIPING CLASS
/ INSULATION / FLUID
CODE BREAK
PIPING CLASS
/ INSULATION / FLUID
CODE BREAK
V3
CDOD
3/ 4"
Rev.
DGS 0000 021 1
Page
13 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
3. LP Sour Gas/Acid Gas and LP Sour Liquid (below ANSI Class 600#)
For LP Sour Gas, sour Liquid and Acid Gas with XV valve at the Battery Limit, refer to the following schemes for incoming and outgoing lines.
FL
XV
LP SOUR GAS & ACID
GAS INLET
BLMIN.
MIN.
PIPING CLASS
/ INSULATION / FLUID
CODE BREAK
PIPING CLASS
/ INSULATION / FLUID
CODE BREAKPURGE
CDOD
3/ 4"
FL
XV
LP SOUR GAS & ACID
GAS OUTLET
BL
MIN.
PIPING CLASS
/ INSULATION / FLUID
CODE BREAK
PIPING CLASS
/ INSULATION / FLUID
CODE BREAK
CDOD
3/ 4"
Rev.
DGS 0000 021 1
Page
14 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
4. LP Sweet Gas and LP Sweet Liquid (ANSI Class 600# and below)
For LP Sweet Gas and LP Sweet Liquid with XV valve at the Battery Limit, refer to the following schemes for incoming and outgoing lines.
FL
XV
LP SWEET
GAS INLET
BLMIN.
MIN.
PIPING CLASS
/ INSULATION / FLUID
CODE BREAK
PIPING CLASS
/ INSULATION / FLUID
CODE BREAKPURGE
CDOD
3/ 4"
FL
XV
LP SWEET
GAS OUTLET
BL
MIN.
PIPING CLASS
/ INSULATION / FLUID
CODE BREAK
PIPING CLASS
/ INSULATION / FLUID
CODE BREAK
CDOD
3/ 4"
Rev.
DGS 0000 021 1
Page
15 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
c. Flare Headers Battery Limit
TO MAIN FLARE
HEADER
BL
MIN.
1½"
UPPER TANGENT LINE
LO
NOTE 1MIN.
Note 1:
Valve shall be installed with stem in horizontal position and locked open with position indicator.
d. Utilities Battery Limit
Double block-valve Vent Drain
B/L valve
by-pass
Steam condensate No Yes Yes No
HP Steam (STH, STS) Yes Yes Yes Yes
LP Steam (STL, SLH) No Yes Yes Yes
Fuel gas No Yes Yes No
Nitrogen No Yes No No
Instrument./Plant air No Yes No No
BFW No No Yes No
Utility water No No Yes No
Cooling water No No Yes No
Potable water No No Yes No
Demineralized water No No Yes No
Rev.
DGS 0000 021 1
Page
16 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
APPENDIX 2: DRAINS’ REPRESENTATION FOR VARIOUS SYSTEMS
CD
Piping Class break
(if applicable)
Second Piping Class break
(if applicable)
Globe Valve
(or GD, SDM, ....)
Multiple drains arrangement
Valve(s) type
according to
piping class
OD
Valve type
according to
piping class
1. A note on P&ID should indicate that drains could be tie-in.
“Drains to closed drain systems (CD, SDM, .....) Should be grouped according to piping arrangement"
2. Drains to closed systems are not intended to be operated when the line / equipment is in service. The normal procedure is to empty the line/vessel to the maximum possible extent to capacities where liquids can be easily recovered, isolate line/vessel and reduce pressure before draining to the closed drain network. Therefore double valving upstream spectacle blind is not foreseen.
Rev.
DGS 0000 021 1
Page
17 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
APPENDIX 3: CRITERIA FOR CONTROL VALVE SIZE OF BOTH BLOCK AND BYPASS
Line size (inches)
Control Valve
size (inches)
1.5" 2" 3" 4" 6" 8" 10" 12" 14"
3/4" Block
Bypass
1.5"
1.5"
2"
2"
1" Block
Bypass
1.5"
1.5"
2"
2"
2"
2"
1.5" Block
Bypass
1.5"
1.5"
2"
2"
2"
2"
3"
3"
2" Block
Bypass
2"
2"
3"
2"
3"
3"
4"
4"
3" Block
Bypass
3"
3"
4"
3"
4"
4"
6"
6"
4" Block
Bypass
4"
4"
6"
4"
6"
6"
8"
8"
6" Block
Bypass
6"
6"
8"
6"
8"
8"
10"
10"
8" Block
Bypass
8"
8"
10"
8"
10"
10"
12"
12"
10" Block
Bypass
10"
10"
12"
10"
12"
12"
12" Block
Bypass
12"
12"
14"
12"
14" Block
Bypass
14"
14"
Notes:
1. Other configurations to be studied on a case by case basis, using the same approach.
2. Reducers to be installed according to the above table.
3. For flashing services, the line downstream the block valve should of a size equal to the main line size and equipped with the corresponding reducer. In all other cases, by-pass line and valve should be of identical size.
4. By-pass valves should normally be globe valves if smaller or equal to 6".
5. By-pass valve size may be reduced if they impair downstream safety relief system unless otherwise requested by COMPANY.
Rev.
DGS 0000 021 1
Page
18 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
APPENDIX 4: DOUBLE VALVE REQUIREMENTS
Service Sweet Service
900 # and above
Sour Service (5)
600# and above
Control valves block valves doubled doubled
Control valves by-pass valves doubled (2) doubled (2)
PSV's inlet block valves doubled doubled
PSV's outlet block valves not doubled not doubled
PSV's bypass valves doubled (2) doubled (2)
Battery limit valves doubled (1) doubled (1)
Pumps suction/discharge block valves not applicable doubled (1)
Itemized filters
Launchers and Receivers
doubled (1)
doubled (3, 4)
doubled (1)
doubled (3, 4)
Notes:
1. ESD valve may be used as second block valve
2. One valve is used for throttling purposes (usually a globe valve)
3. Pipeline Launchers and Receivers shall have double block valves for 300# and above
4. A bleed / drain connection shall be provided in the pipe spool between the valves.
5. Sour services: Streams contain H2S level > 1000 ppm-mole on either wet or dry basis.
Rev.
DGS 0000 021 1
Page
19 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
APPENDIX 5: VENTS AND DRAINS FOR PUMPS
All pumps shall be able to be vented and drained to the most appropriate collection system in accordance with the service.
Pump vent and drain shall be as per typical following examples.
PIPING CLASS /INSULATION
BREAK (IF APPLICABLE)
(OR SDM, GD ETC.)CDOD
LPTOR
FL
DETAIL 'A1' - PUMPS IN HYDROCARBON, TOXIC OR CHEMICAL SERVICE
(FILTER IN VERTICAL POSITION)
(OR FAG)
3/4"
3/4"
3/4"
3/4"
3/4"
3/4"
2" PURGE
CONN.
Rev.
DGS 0000 021 1
Page
20 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
PIPING CLASS /INSULATION
BREAK (IF APPLICABLE)
(OR SDM, GD ETC.)CDOD
OR
FL
DETAIL 'A2' - PUMPS IN HYDROCARBON, TOXIC OR CHEMICAL SERVICE
(FILTER IN HORIZONTAL POSITION)
(OR FAG)
3/4"
3/4"
3/4"
3/4"
3/4"
2"
PURGE CONN.
Notes:
1. Eccentric reducer
2. Use basket filter for large suction pipe size, i.e., >16”
Rev.
DGS 0000 021 1
Page
21 of 21
ABU DHABI GAS INDUSTRIES LTD. (GASCO)
P & ID DEVELOPMENT
DGS 0000-021 REV1
APPENDIX 6: SELECTION TABLE FOR SPECTACLE BLANK, PADDLE SPACER/ BLANK