ASTM F1792-97(2010)
(Specification)Standard Specification for Special Requirements for Valves Used in Gaseous Oxygen Service
Standard Specification for Special Requirements for Valves Used in Gaseous Oxygen Service
ABSTRACT
This specification covers the special requirements for valves used in gaseous oxygen service. The pressure containing/retaining envelope, bellows, and end nipples, shall be made of nickel-copper alloy. Internal trim which is in contact with the line media shall either be made of nickel-copper alloy, bronze, nickel-aluminum-bronze, Inconel alloy 600, brass or other materials which are compatible with oxygen service. Non-metallic seat, seat insert, or seals shall be manufacture from either TFE, reinforced TFE, CTFE, plastic, polyamide, or PEEK. Materials for lubricants shall be halocarbon, Dupont, Barycote 601, or other lubricants compatible with oxygen service. Valves shall be constructed to minimize the possibility of initiating ignition in gaseous oxygen service. Valves shall be constructed to minimize oxygen escape in the event of an internal or external fire. This shall be accomplished by pressure-boundary sealing, internal seating and pressure surge. The manual valves shall be of the packless design, with the stem sealed by a bellows.
SCOPE
1.1 This specification covers the special requirements for valves used in gaseous oxygen service. It is intended that this specification be invoked as an additional requirement in conjunction with primary valve specifications.
1.2 The values stated in this specification in inch-pound units are to be regarded as the standard. The SI equivalent shown in parenthesis are provided for information only.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:F1792 −97(Reapproved 2010) An American National Standard
Standard Specification for
Special Requirements for Valves Used in Gaseous Oxygen
Service
This standard is issued under the fixed designation F1792; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope MIL-STD-278 Fabrication,Welding and Inspection; Casting
Inspection and Repair for Machinery, Piping and Process
1.1 This specification covers the special requirements for
Vessels in Ships of the United States Navy
valves used in gaseous oxygen service. It is intended that this
MIL-STD-271 Non-destructive Testing Requirements for
specification be invoked as an additional requirement in
Metals
conjunction with primary valve specifications.
MIL-P-46122 Plastic Molding and Extrusion Material, Poly-
1.2 The values stated in this specification in inch-pound
vinylidene Fluoride Polymer and Copolymer
units are to be regarded as the standard. The SI equivalent
shown in parenthesis are provided for information only.
3. Ordering Information
3.1 Ordering documentation for valves under this specifica-
2. Referenced Documents
tion shall include the following information, as required, to
2.1 ASTM Standards:
describe the equipment adequately.
G63 Guide for Evaluating Nonmetallic Materials for Oxy-
3.1.1 ASTM designation and year of issue.
gen Service
3.1.2 Primary valve specification (see 1.1).
G88 Guide for Designing Systems for Oxygen Service
3.1.3 End preparations, if different than specified in 4.4.
G93 Practice for Cleaning Methods and Cleanliness Levels
3.1.4 Supplementary requirements, if any (see S1 through
for Material and Equipment Used in Oxygen-Enriched
S4).
Environments
G94 Guide for Evaluating Metals for Oxygen Service
4. Valve Design and Construction
2.2 American National Standards Institute (ANSI):
4.1 Valvesshallincorporatethefeaturesspecifiedin4.2-4.6.
ANSI B1.1 Unified Screw Threads
2.3 American Society of Mechanical Engineers (ASME):
4.2 Materials of Construction—Material requirements shall
ASME Boiler and Pressure Vessel Code
be as follows:
2.4 Military Standards and Specifications: 4.2.1 The pressure containing/retaining envelope (including
MIL-STD-1330 Standard Practice for Precision Cleaning
any bolting, union nuts, or other fastening devices establishing
and Testing of Shipboard Oxygen, Helium, Helium-
the integrity of the pressure containing/retaining envelope),
Oxygen, Nitrogen, and Hydrogen Systems
bellows (where applicable), and end nipples, shall be nickel-
MIL-V-5027 Valves, Check, Oxygen, High Pressure
copper (70-30). Internal trim which is in contact with the line
media shall be nickel-copper (70-30), bronze, nickel-
aluminum-bronze, InconelAlloy 600, brass, or other materials
This specification is under the jurisdiction of ASTM Committee F25 on Ships
which are compatible with oxygen service.
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
Machinery and Piping Systems. 4.2.2 Non-metallicseat,seatinsert,orseals.Thesematerials
Current edition approved May 1, 2010. Published June 2010. Originally
shall be selected from TFE, Reinforced TFE, CTFE, plastic in
approved in 1997. Last previous edition approved in 2004 as F1792 - 97 (2004).
accordance with MIL-P-46122, Polyamide (Vespel), or PEEK.
DOI: 10.1520/F1792-97R10.
2 The materials for O-rings and gaskets shall be compatible for
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
oxygen service.
Standards volume information, refer to the standard’s Document Summary page on
4.2.3 Lubricants—Materials for lubricants shall be halocar-
the ASTM website.
bon (25-5S), Dupont (Krytox 240AC, 240AZ), Braycote 601,
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
or other lubricants compatible with oxygen service.
4th Floor, New York, NY 10036, http://www.ansi.org.
Available from American Society of Mechanical Engineers (ASME), ASME
4.2.4 Guidance on the selection of materials for oxygen
International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
service can be found in Guides G63 and G94. Guidance on
www.asme.org.
designing systems for oxygen service can be found in Guide
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS. G88.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1792−97 (2010)
4.3 General Requirements: 4.4.3 Cleaning—Prior to assembly and testing, valves shall
4.3.1 Fire Prevention—Valves shall be constructed to mini- bedegreasedandcleanedinaccordancewithPracticeG93,and
mize the possibility of initiating ignition in gaseous oxygen thereafter maintained clean for oxygen service.
service. This shall be accomplished by the following:
4.5 End Preparation—Unless otherwise specified (see Sec-
4.3.1.1 Materials for parts in contact with oxygen shall have
tion 3), end preparation for the valves shall be as follows:
the highest spontaneous ignition temperatures and the lowest
4.5.1 Valves shall be supplied with inline extension nipples
impact sensitivities compatible with construction and perfor-
welded directly to the valve body or fabricated as an integral
mance limitations.
part of the valve body. Nipples shall be of the same basic
4.3.1.2 Surfaces in contact with oxygen shall be smooth
material as the body. The length and schedule of these nipples
with well-rounded edges and without sharp or thin sectioned
shall be as specified in Table 1.
protrusions (that is, all parts shall have a high ratio of
4.6 Welding and Nondestructive Testing—Welding and non-
volume-to-surface area). Sharp exterior corners are prohibited,
destructive testing shall be in accordance with ASME Boiler
and interior corners shall have fillets to prevent the retention or
and Pressure Vessel Code, Sections VIII and IX.
entrapment of machining chips, burrs, or foreign material.
4.3.1.3 Nonmetallic materials (O-rings, gaskets, etc.) other
5. Marking
than the seating insert, if applicable, shall be well removed
from the main flow path. 5.1 Identification Plates—A metallic corrosion-resisting
4.3.2 Fire Containment—Valves shall be constructed to identification plate shall be securely attached to the valve and
minimize oxygen escape in the event of an internal or external shall indicate “Valve specially made for oxygen service”.
fire. This shall be accomplished by the following:
5.2 In addition, each valve shall be marked in accordance
4.3.2.1 Pressure-Boundary Sealing—Joints for the pressure-
with their applicable primary valve specification requirements.
boundary seals shall provide an effective barrier to leakage in
the event of damage or consumption of the non-metallic
6. Quality Assurance System
sealingelementsbyprovidinglong,closefittingmetal-to-metal
6.1 The manufacturer shall establish and maintain a quality
leakage or flame paths.
assurance system that will ensure all the requirements of this
4.3.2.2 Internal Seating—The seat design shall be such that
specification are satisfied.
intheeventthatthenon-metallicseatisdamaged,destroyed,or
carried away, there will be a secondary metal-to-metal seat to 6.2 Awrittendescriptionofthequalityassurancesystemthe
manufacturer will use shall be available for review and
minimize through seat leakage. The construction and location
acceptance by the inspection authority.
of the nonmetallic seals and seating inserts shall minimize the
possibility of ignition under a pressure surge.
6.3 The purchaser reserves the right to witness any tests and
4.3.2.3 Pressure Surge—Valves shall be designed to prevent
inspect the valves in the manufacturer’s plant to the extent
pressure surge, which could cause auto-ignition.
specified on the purchase order.
4.4 Design Features:
4.4.1 Manualvalvesshallbeofthepacklessdesign,withthe
stem sealed by a bellows.
TABLE 1 Length and Schedule of Extension Nipples
4.4.2 Threads—Threads shall conform to ANSI B1.1. Use
Minimum Length
of threads in contact with oxygen shall be minimized. Any
of Extension,
Size of Valve Pipe Schedule
threads wetted by oxygen shall be of rolled construction or inches (Valve
Center to End)
shall be completely chamfered and deburred to prevent the
⁄4 NPS to 1 NPS (13.5 mm to 33.7 mm) 80 7.00 (178 mm)
possibility o
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