ASTM F1792-97
(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
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
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An American National Standard
Designation: F 1792 – 97
Standard Specification for
Special Requirements for Valves Used in Gaseous Oxygen
Service
This standard is issued under the fixed designation F 1792; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope MIL-STD-271 Non-destructive Testing Requirements for
Metals
1.1 This specification covers the special requirements for
MIL-P-46122 Plastic Molding and Extrusion Material,
valves used in gaseous oxygen service. It is intended that this
Polyvinylidene Fluoride Polymer and Copolymer
specification be invoked as an additional requirement in
conjunction with primary valve specifications.
3. Ordering Information
1.2 The values stated in this specification in inch-pound
3.1 Ordering documentation for valves under this specifica-
units are to be regarded as the standard. The SI equivalent
tion shall include the following information, as required, to
shown in parenthesis are provided for information only.
describe the equipment adequately.
2. Referenced Documents 3.1.1 ASTM Designation and Year of Issue.
3.1.2 Primary Valve specification (see 1.1).
2.1 ASTM Standards:
3.1.3 End Preparations, if different than specified in 4.4.
G 63 Guide for Evaluating Nonmetallic Materials for Oxy-
3.1.4 Supplementary requirements, if any (see S1 through
gen Service
S4).
G 88 Guide for Designing Systems for Oxygen Service
G 93 Practice for Cleaning Methods for Materials and
4. Valve Design and Construction
Equipment Used in Oxygen-Enriched Environments
4.1 Valves shall incorporate the features specified in 4.2-4.6.
G 94 Guide for Evaluating Metals for Oxygen Service
4.2 Materials of Construction—Material requirements shall
2.2 American National Standards Institute (ANSI):
be as follows:
B1.1 Unified Screw Threads
4.2.1 The pressure containing/retaining envelope (including
2.3 American Society of Mechanical Engineers (ASME):
4 any bolting, union nuts, or other fastening devices establishing
Boiler and Pressure Vessel Code
the integrity of the pressure containing/retaining envelope),
2.4 Military Standards and Specifications:
bellows (where applicable), and end nipples, shall be Nickel-
MIL-STD-1330 Standard Practice for Precision Cleaning
Copper (70-30). Internal trim which is in contact with the line
and Testing of Shipboard Oxygen, Helium, Helium-
5 media shall be Nickel-Copper (70-30), Bronze, Nickel-
Oxygen, Nitrogen, and Hydrogen Systems
5 Aluminum-Bronze, Inconel Alloy 600, Brass, or other materi-
MIL-V-5027 Valves, Check, Oxygen, High Pressure
als which are compatible with oxygen service.
MIL-STD-278 Fabrication, Welding and Inspection; Cast-
4.2.2 Non-metallic Seat, Seat Insert, or seals. These mate-
ing Inspection and Repair for Machinery, Piping and
5 rials shall be selected from TFE, Reinforced TFE, CTFE,
Process Vessels in Ships of the United States Navy
plastic in accordance with MIL-P-46122, Polyamide (Vespel),
or PEEK. The materials for O-rings and gaskets shall be
compatible for Oxygen service.
This specification is under the jurisdiction of ASTM Committee F25 on Ships
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on 4.2.3 Lubricants—Materials for lubricants shall be Halocar-
Machinery and Piping Systems.
bon (25-5S), Dupont (Krytox 240 AC, 240 AZ), Braycote 601
Current edition approved April 10, 1997. Published August 1997.
or other lubricants compatible with oxygen service.
Annual Book of ASTM Standards, Vol 14.02.
4.2.4 Guidance on the selection of materials for Oxygen
Available from American National Standards Institute, 25 W. 43rd St., 4th
Floor, New York, NY 10036.
service can be found in ASTM G 63, and G 94. Guidance on
Available from American Society of Mechanical Engineers ASME Interna-
designing Systems for Oxygen service can be found in ASTM
tional Headquarters, Three Park Ave., New York, NY 10016–5990.
5 G 88.
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
4.3 General Requirements:
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F1792–97
4.3.1 Fire Prevention—Valves shall be constructed to mini- 4.4.3 Cleaning—Prior to assembly and testing, valves shall
mize the possibility of initiating ignition in gaseous oxygen be degreased and cleaned in accordance with Practice G 93,
service. This shall be accomplished by the following: and thereafter maintained clean for oxygen service.
4.3.1.1 Materials for parts in contact with oxygen shall have
4.5 End Preparation—Unless otherwise specified (see Sec-
the highest spontaneous ignition temperatures and the lowest
tion 3), end preparation for the valves shall be as follows:
impact sensitivities compatible with construction and perfor-
4.5.1 Valves shall be supplied with inline extension nipples
mance limitations.
welded directly to the valve body or fabricated as an integral
4.3.1.2 Surfaces in contact with oxygen shall be smooth
part of the valve body. Nipples shall be of the same basic
with well rounded edges and without sharp or thin sectioned
material as the body. The length and schedule of these nipples
protrusions (that is, all parts shall have a high ratio of volume
shall be as specified in Table 1.
to surface area). Sharp exterior corners are prohibited, and
4.6 Welding and Nondestructive Testing—Welding and
interior corners shall have fillets to prevent the retention or
Nondestructive testing shall be in accordance with ASME
entrapment of machining chips, burrs, or foreign material.
Boiler and Pressure Vessel Code, Sections VIII and IX.
4.3.1.3 Nonmetallic materials (O-rings, gaskets, etc.) other
than the seating insert, if applicable, shall be well removed
5. Marking
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
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
metal-to-metal leakage or flame paths.
6.1 The manufacturer shall establish and maintain a quality
4.3.2.2 Internal Seating—The seat design shall be such that
assurance system that will ensure all the requirements of this
in the event that the non-metallic seat is damaged, destroyed or
specification are satisfied.
carried away, there will be a secondary metal-to-metal seat to
6.2 A written description of the quality assurance system the
minimize through seat leakage. The construction and location
manufacturer will use shall be available for review and
of the nonmetallic seals and seating inserts shall minimize the
acceptance by the inspection authority.
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 manufacture’s plant to the extent
pressure surge which could cause auto-ignition.
specified on the purchase order.
4.4 Design Features:
4.4.1 Manual valves shall be of the packless design, with the
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 of sharp edges or machining burrs in contact with
1 1
1- ⁄2 NPS to 2- ⁄2 NPS (48.3 mm to 73.0 mm) 160 12.0 (305 mm)
oxygen.
SUPPLEMENTAR
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