The valve style numbering system provided below was developed to provide the cognizant engineer with a convenient method of identifying the desired features in valve procurements. The style number system provides a method of alpha-numeric identification of valves and should be used for identifying valves on the design drawings and/or Bills of Material. This system should be used in addition to the unique component numbering system required by ESM Chapter 1, Section 230, Component Nomenclature.
The following page provides a description of the numbering scheme for the valve specifications.
The following general notes are applicable to all of the valve specifications:
1) Desired features that are required by the engineering design but not identified in the style valve number must be noted in the procurement documents and on the applicable design drawings.
2) Not all possible combinations of materials are necessarily available. Some combinations may require extensive lead times and high cost. The purchaser should take care to specify only what is required by design, and should consult available manufacturers to decide between acceptable options on the basis of what may be readily available.
3) Acceptance of valves that do not specifically conform to all requirements of one of the listed standards (Table D-1) is at the discretion of the cognizant engineer, and may required additional qualification to comply with the applicable piping code (e.g.
qualification as an unlisted component per ASME B31.3).
4) Valve materials identified are those that are commonly available. Other materials may be available, and material availability changes over time with the advent of new and better materials. The valve style numbering system is controlled by the ESM Pressure Safety Point-of-Contact, and consideration will be given to any additions required by specific facilities on a case by case basis.
5) For austenitic stainless steel valves with welded ends (socket weld or butt weld), the low carbon alloys are required (e.g. F304L, CF3, F316L, or CF3M).
EXAMPLE VALVE STYLE NUMBER:
NOTES:
CV 1 0 1 GW - # - A B C D E
1 2 3 4 5 6 7 8 9 10 11 1-ASTM A216 WCB or A105
2-CF3, CF8, F304, or F304L 3-CF3M, CF8M, F316, or F316L 4-Use only in copper piping systems.
5-Includes Swagelok and Parker tube fittings.
6-Includes NBR and Buna-N.
7-Use only non-asbestos.
8-Non welded end stainless steel valves pressure rating is based on the high carbon (non L) grade.
9-Specify port requirement.
1-Acceptable Standards - LANL Valve 2- Basic Material (Body Material) 3-Pressure Class
4-Type of End Connection 5-Type of Valve 6-Valve Size
7-Disc or Ball Material (optional) 8-Seat Material (optional) 9-Stem Material (optional) 10-Packing Material (optional) 11-Body Gasket Material (optional)
REQUIRED SPECIFICATION FEATURES
1) Acceptable Standards 2) Basic Material 3) Pressure Class (8) 4) End Connection 5) Type of Valve
CV Code Valve 1 Brass 0 125 1 Flanged BL Ball
NV Non Code Valve 2 Bronze 1 150 2 Socket Weld BT Butterfly
3 Iron (Cast/Ductile) 2 200 3 Butt Weld CB Ball Check
4 Carbon Steel (1) 3 300 4 Threaded CF Folding Disc Check
5 Stainless Steel 304/304L (2)
4 400 5 Wafer CL Tilting Disc Check
6 Stainless Steel 316/316L (3)
6 600 6 Solder (4) CP Poppet Check
7 Monel 8 800 7 Flare CS Swing Check
8 Alloy 20 9 900 8 Mechanical CT Tilting Disc Check
9 Hastelloy P Pressure Rated 9 Compression (5) DV Diaphram
E Engineered Procurement E Engineered
Procurement
GF Gate:Flex./Wedge/Split Disc
GK Knife Gate GP Parallel Gate GW Solid Wedge Gate PI Pinch
PV Plug SC Stop Check TA Angle Globe TN Needle Globe TS Standard Globe TY Y Pattern Globe V3 Three Way (9)
OPTIONAL SPECIFICATION FEATURES
7) Disc Material 8) Seat Material 9) Stem Material 10) Packing Material 11) Body Gasket A Chromium (11-13%) A Chromium (11-13%) A Chromium (11-13%) A Graphite A Graphite B Stellite (Hard Face) B Stellite (Hard Face) B Carbon Steel B Teflon B Teflon
C Bronze C Bronze C Bronze C Natural Rubber C Natural Rubber
D Stainless Steel D Stainless Steel D Stainless Steel D Nylon D Nylon
E Monel E Monel F Alloy 20 E Nitrile (6) E Nitrile (6)
F Alloy 20 F Alloy 20 G Hastelloy F Neoprene F Neoprene
G Hastelloy G Hastelloy H Brass G Viton G Viton
H Brass H Brass I Nickel Copper H EPDM H EPDM
I Nickel Copper I Nickel Copper S Special (Specify) R UHMWPE I Ferrous
J Teflon J Teflon X No Specifc Requirement
(7)
S Special (Specify) J Non-Ferrous
K Natural Rubber K Natural Rubber X No Specifc Requirement
(7)
K Spiral Wound w/Teflon
L Nylon L Nylon L Spiral Wound w/Graphite
M Nitrile (6) M Nitrile (6) R UHMWPE
N Neoprene N Neoprene S Special (Specify)
O Viton O Viton X No Specific Requirement (7)
P EPDM P EPDM
Q Vespel Q Vespel
S Special (Specify) R UHMWPE X No Specific Requirement (7) S Special (Specify)
X No Specifc Requirement (7)
decision, and replacement of existing valves should be with a new valve that has all of the features required by the design. If the specific features that the cognizant engineer originally required are not known, replacement should be in kind unless the valve did not perform satisfactorily.
Replacement of a valve that did not perform acceptably in a given service is the responsibility of the cognizant engineer. The cause of the unsuitability of the valve (e.g. material compatibility, functional problem, etc.) should be determined before a replacement valve is specified.
APPENDIX E – FLANGED CONNECTIONS
Introduction
The guidance provided by this appendix is based on ASME B16.5 flanges. The majority of this guidance is representative of “good practices” that applies to the installation of many types of pipe flanges. Torque values presented herein are based on ASME B16.5 flanges and should be confirmed by engineering prior to use with other flanges.
Many factors can affect the ability of a flanged joint to establish an initial seal and maintain that seal during service for an extended period of time. One of the most important considerations is proper flange installation. The following guidance is provided to ensure that flanges are installed correctly either during initial installation or during maintenance activities.
ASME B31.3 recognizes a variety of national flange standards as “listed” components, including the following:
ASME 16.1 “Cast Iron Pipe Flanges and Flanged Fittings, Class 25, 125, 250 and 800,”
ASME 16.5 “Pipe Flanges and Flanged Fittings,”
ASME B16.36 “Orifice Flanges,"
ASME B16.42 “Ductile Iron Pipe Flanges and Flanged Fittings, Class 150, and 300,”
ASME B16.47 “Large Diameter Steel Flanges, NPS 26 Through NPS 60,”
AWWA C207 “Steel Pipe Flanges,”
MSS SP-44 “Steel Pipeline Flanges,” and
MSS SP-51 “Class 150LW Corrosion Resistant Cast Flanges and Flanged Fittings.”