ASTM F1792-97(2004)
(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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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.
An American National Standard
Designation: F1792 – 97 (Reapproved 2004)
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 ing Inspection and Repair for Machinery, Piping and
Process Vessels in Ships of the United States Navy
1.1 This specification covers the special requirements for
MIL-STD-271 Non-destructive Testing Requirements for
valves used in gaseous oxygen service. It is intended that this
Metals
specification be invoked as an additional requirement in
MIL-P-46122 Plastic Molding and Extrusion Material,
conjunction with primary valve specifications.
Polyvinylidene Fluoride Polymer and Copolymer
1.2 The values stated in this specification in inch-pound
units are to be regarded as the standard. The SI equivalent
3. Ordering Information
shown in parenthesis are provided for information only.
3.1 Ordering documentation for valves under this specifica-
2. Referenced Documents tion shall include the following information, as required, to
2 describe the equipment adequately.
2.1 ASTM Standards:
3.1.1 ASTM designation and year of issue.
G63 Guide for Evaluating Nonmetallic Materials for Oxy-
3.1.2 Primary valve specification (see 1.1).
gen Service
3.1.3 End preparations, if different than specified in 4.4.
G88 Guide for Designing Systems for Oxygen Service
3.1.4 Supplementary requirements, if any (see S1 through
G93 Practice for Cleaning Methods and Cleanliness Levels
S4).
for Material and Equipment Used in Oxygen-Enriched
Environments
4. Valve Design and Construction
G94 Guide for Evaluating Metals for Oxygen Service
4.1 Valvesshallincorporatethefeaturesspecifiedin4.2-4.6.
2.2 American National Standards Institute (ANSI):
4.2 Materials of Construction—Material requirements shall
B1.1 Unified Screw Threads
4 be as follows:
2.3 American Society of Mechanical Engineers (ASME):
4.2.1 The pressure containing/retaining envelope (including
Boiler and Pressure Vessel Code
5 any bolting, union nuts, or other fastening devices establishing
2.4 Military Standards and Specifications:
the integrity of the pressure containing/retaining envelope),
MIL-STD-1330 Standard Practice for Precision Cleaning
bellows (where applicable), and end nipples, shall be nickel-
and Testing of Shipboard Oxygen, Helium, Helium-
copper (70-30). Internal trim which is in contact with the line
Oxygen, Nitrogen, and Hydrogen Systems
media shall be nickel-copper (70-30), bronze, nickel-
MIL-V-5027 Valves, Check, Oxygen, High Pressure
aluminum-bronze, InconelAlloy 600, brass, or other materials
MIL-STD-278 Fabrication, Welding and Inspection; Cast-
which are compatible with oxygen service.
4.2.2 Non-metallicseat,seatinsert,orseals.Thesematerials
This specification is under the jurisdiction of ASTM Committee F25 on Ships
shall be selected from TFE, Reinforced TFE, CTFE, plastic in
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
accordance with MIL-P-46122, Polyamide (Vespel), or PEEK.
Machinery and Piping Systems.
The materials for O-rings and gaskets shall be compatible for
Current edition approved May 1, 2004. Published May 2004. Originally
approved in 1997. Last previous edition approved in 1997 as F1792 - 97. DOI:
oxygen service.
10.1520/F1792-97R04.
4.2.3 Lubricants—Materials for lubricants shall be halocar-
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
bon (25-5S), Dupont (Krytox 240AC, 240AZ), Braycote 601,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
or other lubricants compatible with oxygen service.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
4.2.4 Guidance on the selection of materials for oxygen
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
service can be found in Guides G63 and G94. Guidance on
4th Floor, New York, NY 10036.
4 designing systems for oxygen service can be found in Guide
Available from American Society of Mechanical Engineers (ASME), ASME
International Headquarters, Three Park Ave., New York, NY 10016-5990. G88.
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F1792 – 97 (2004)
4.3 General Requirements: shall be completely chamfered and deburred to prevent the
possibility of sharp edges or machining burrs in contact with
4.3.1 Fire Prevention—Valves shall be constructed to mini-
oxygen.
mize the possibility of initiating ignition in gaseous oxygen
4.4.3 Cleaning—Prior to assembly and testing, valves shall
service. This shall be accomplished by the following:
bedegreasedandcleanedinaccordancewithPracticeG93,and
4.3.1.1 Materials for parts in contact with oxygen shall have
thereafter maintained clean for oxygen service.
the highest spontaneous ignition temperatures and the lowest
4.5 End Preparation—Unless otherwise specified (see Sec-
impact sensitivities compatible with construction and perfor-
tion 3), end preparation for the valves shall be as follows:
mance limitations.
4.5.1 Valves shall be supplied with inline extension nipples
4.3.1.2 Surfaces in contact with oxygen shall be smooth
welded directly to the valve body or fabricated as an integral
with well-rounded edges and without sharp or thin sectioned
part of the valve body. Nipples shall be of the same basic
protrusions (that is, all parts shall have a high ratio of
material as the body. The length and schedule of these nipples
volume-to-surface area). Sharp exterior corners are prohibited,
shall be as specified in Table 1.
and interior corners shall have fillets to prevent the retention or
4.6 Welding and Nondestructive Testing—Welding and non-
entrapment of machining chips, burrs, or foreign material.
destructive testing shall be in accordance with ASME Boiler
4.3.1.3 Nonmetallic materials (O-rings, gaskets, etc.) other
and Pressure Vessel Code, Sections VIII and IX.
than the seating insert, if applicable, shall be well removed
5. Marking
from the main flow path.
4.3.2 Fire Containment—Valves shall be constructed to 5.1 Identification Plates—A metallic corrosion-resisting
minimize oxygen escape in the event of an internal or external identification plate shall be securely attached to the valve and
fire. This shall be accomplished by the following: shall indicate “Valve specially made for oxygen service”.
5.2 In addition, each valve shall be marked in accordance
4.3.2.1 Pressure-Boundary Sealing—Joints for the
with their applicable primary valve specification requirements.
pressure-boundary seals shall provide an effective barrier to
leakage in the event of damage or consumption of the
6. Quality Assurance System
non-metallic sealing elements by providing long, close fitting
6.1 The manufacturer shall establish and maintain a quality
metal-to-metal 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
6.2 Awrittendescriptionofthequalityassurancesystemthe
carried away, there will be a secondary metal-to-metal seat to
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
6.3 The purchaser reserves the right to witness any tests and
possibility of ignition under a pressure surge.
inspect the valves in the manufacturer’s plant to the extent
4.3.2.3 Pressure Surge—Valvesshallbedesignedtoprevent
specified on the purchase order.
pressure surge, which could cause auto-ignition.
TABLE 1 Length and Schedule of Extension Nipples
4.4 Design Features:
Minimum Length
4.4.1 Manualvalvesshallbeofthepacklessdesign,withthe
of Extension,
Size of Valve Pipe Schedule
stem sealed by a bellows.
inches (Valve
Center to End)
4.4.2 Threads—Threads shall conform to ANSI B1.1. Use
⁄4 NPS to 1 NPS (13.5 mm to 33.7 mm) 80 7.00 (178 mm)
of threads in contact with oxy
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