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ASTM F721-81(2004)

(Specification)

Standard Specification for Gage Piping Assemblies

Standard Specification for Gage Piping Assemblies

ABSTRACT
This specification covers details of gage piping assemblies for pressure gages with optional provisions for additional gages, pressure switches, transmitters, and so forth, for use with steam, steam drains, feed water, condensate, fresh water, salt water, compressed air, fuel oil, and lubricating oil systems. A siphon shall be used as shown in all gage applications for steam systems to maintain a protective water seal between the gage and the steam supply.
SCOPE
1.1 This specification covers details of gage piping assemblies for pressure gages with optional provisions for additional gages, pressure switches, transmitters, and so forth, for use with steam, steam drains, feed water, condensate, fresh water, salt water, compressed air, fuel oil, and lubricating oil systems.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

General Information

Status
Historical
Publication Date
31-Oct-2004
ICS
17.100 - Measurement of force, weight and pressure
Technical Committee
F25 - Ships and Marine Technology
Drafting Committee
F25.11 - Machinery and Piping Systems
Current Stage
Ref Project

Relations

Replaces
ASTM F721-81(1998) - Standard Specification for Gage Piping Assemblies
Effective Date
01-Nov-2004
Replaced By
ASTM F721-81(2008) - Standard Specification for Gage Piping Assemblies
Effective Date
01-Nov-2008

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ASTM F721-81(2004) - Standard Specification for Gage Piping AssembliesASTM F721-81(2004) - Standard Specification for Gage Piping Assemblies
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ASTM F721-81(2004) - Standard Specification for Gage Piping Assemblies
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: F 721 – 81 (Reapproved 2004)
Standard Specification for
1
Gage Piping Assemblies
This standard is issued under the fixed designation F 721; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope B 453/B 453M Specification for Copper-Zinc-Lead Alloy
(Leaded-Brass) Rod, Bar, and Shapes
1.1 This specification covers details of gage piping assem-
B 466/B 466M Specification for Seamless Copper-Nickel
blies for pressure gages with optional provisions for additional
Pipe and Tube
gages, pressure switches, transmitters, and so forth, for use
3
2.2 American National Standard Institute Standards:
with steam, steam drains, feed water, condensate, fresh water,
B16.11 Forged Steel Fittings, Socket Weld, and Threaded
salt water, compressed air, fuel oil, and lubricating oil systems.
B16.15 Cast Bronze Threaded Fittings
1.2 The values stated in inch-pound units are to be regarded
4
2.3 Federal Specifications:
as the standard. The values given in parentheses are for
QQ-S-637 Steel Bar, Carbon, Cold Finished (Standard
information only.
Quality, Free Machining)
2. Referenced Documents
QQ-S-763 Steel Bars, Wire, Shapes, and Forgings,
2
Corrosion-Resisting
2.1 ASTM Standards:
A 105/A105M Specification for Carbon Steel Forgings for
3. List of Assemblies
Piping Applications
3.1 This specification incorporates 13 gage piping assem-
A 106 Specification for Seamless Carbon Steel Pipe for
blies as described in Table 1.
High-Temperature Service
A 108 Specification for Steel Bars, Carbon, Cold Finished,
4. General Requirements and Guidelines
Standard Quality
4.1 Fig. 1 shows a typical piping assembly for bottom-
A 182/A182M Specification for Forged or Rolled Alloy-
connected gages and Fig. 2 a typical piping assembly for
Steel Pipe Flanges, Forged Fittings, and Valves and Parts
back-connected gages.
for High-Temperature Service
4.2 Asiphon shall be used as shown in all gage applications
A 276 Specification for Stainless Steel Bars and Shapes
for steam systems to maintain a protective water seal between
A 335/A335M Specification for Seamless Ferritic Alloy-
the gage and the steam supply.
Steel Pipe for High-Temperature Service
4.3 Each assembly includes a test connection beyond the
A 576 Specification for Steel Bars, Carbon, Hot-Wrought,
1
gage valve which consists of a tee with a ⁄4-in. NPT threaded
Special Quality
plug in the branch. The plug is removable for the purpose of
B 16 Specification for Free-Cutting Brass Rod, Bar, and
installing a test gage for calibration. As an alternative, a gage
Shapes for Use in Screw Machines
valve that incorporates a built-in test connection integral with
B 61 Specification for Steam or Valve Bronze Castings
the valve may be substituted for the gage valve and test tee.
B 62 Specification for Composition Bronze or Ounce Metal
4.4 Root connections should be kept to a minimum by
Castings
connecting other instruments at the tee between the root and
B 75 Specification for Seamless Copper Tube
gage valves. There is no limit to the number of dead-end-type
B 124 Specification for Copper and Copper Alloy Forging
instruments that can be served from a single root connection.
Rod, Bar, and Shapes
However, each instrument should have its own shutoff valve
and, if desired, a test tee may be fitted at each instrument.
4.5 Two shutoff valves are generally used in each assembly,
1
This specification is under the jurisdiction of ASTM Committee F25 on Ships
a root valve and a gage cutout valve. The gage valve may be
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
Machinery and Piping Systems.
Current edition approved Nov. 1, 2004. Published November 2004. Originally
approved in 1981. Last previous edition approved in 1998 as F 721 – 81 (1998).
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM 4th Floor, New York, NY 10036.
4
Standards volume information, refer to the standard’s Document Summary page on AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
the ASTM website. 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.
1

---------------------- Page: 1 ----------------------
F 721 – 81 (2004)
A,B
TABLE 1 Gage Piping Assemblies
Assembly Maximum Pressure, Maximu
...

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5.1 Multi-axis force measuring platforms are used to measure the ground reaction forces produced at the interface between a subject's foot or shoe and the supporting ground surface. These platforms are used in various settings ranging from research laboratories to healthcare facilities. The use of force platforms has become particularly important in gait analysis where clinical evaluations have become a billable clinical service.  
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1.1 This practice applies to the calibration of electronic non-automatic weighing instruments. A non-automatic weighing instrument is a measuring instrument that determines the mass of an object by measuring the gravitational force acting on the object. It requires the intervention of an operator during the weighing process to decide whether the weighing result is acceptable.  
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Note 5: Ref (2) concluded that dusts with KSt values below 45 bar m/s when measured in a 20-L chamber with a 10 000-J ignitor, may not be explosible when tested in a 1-m3 chamber with a 10 000-J ignitor. Ref (2) and unpublished testing has also shown that in some cases the KSt values measured in the 20-L chamber can be lower than those measured in the 1-m3 chamber. Refs (1) and (3) found that for some dusts, it was necessary to use lower ignition energy in the 20-L chamber in order to match MEC or MIC test data in a 1-m3 chamber. If a dust has measurable (nonzero) Pmax and KSt values with a 5000 or 10 000-J ignitor when tested in a 20-L chamber but no measurable Pmax and ...
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1.1 Purpose. The purpose of this test method is to provide standard test methods for characterizing the “explosibility” of dust clouds in two ways, first by determining if a dust is “explosible,” meaning a cloud of dust dispersed in air is capable of propagating a deflagration, which could cause a flash fire or explosion; or, if explosible, determining the degree of “explosibility,” meaning the potential explosion hazard of a dust cloud as characterized by the dust explosibility parameters, maximum explosion pressure, Pmax; maximum rate of pressure rise, (dP/dt)max; and explosibility index, KSt.  
1.2 Limitations. Results obtained by the application of the methods of this standard pertain only to certain combustion characteristics of dispersed dust clouds. No inference should be drawn from such results relating to the combustion characteristics of dusts in other forms or conditions (for example, ignition temperature or spark ignition energy of dust clouds, ignition properties of dust layers on hot surfaces, ignition of bulk dust in heated environments, etc.)  
1.3 Use. It is intended that results obtained by application of this test be used as elements of a dust hazard analysis (DHA) that takes into account other pertinent risk factors; and in the specification of explosion prevention systems (see, for example NFPA 68, NFPA 69, and NFPA 652) when used in conjunction with approved or recognized design methods by those skilled in the art.
Note 1: Historically, the evaluation of the deflagration parameters of maximum pressure and maximum rate of pressure rise has been performed using a 1.2-L Hartmann Apparatus. Test Method E789, which describes this method, has been withdrawn. The use of data obtained from the test method in the design of explosion protection systems is not recommended.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1....

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1.1 This test method covers the quantitative measurement and normalization of impact forces generated through a mechanical impact test on an athletic surface. The impact forces simulated in this test method are intended to represent those produced by lower extremities of an athlete during landing events on sport or athletic surfaces.  
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1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.  
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1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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Standard Practices for Calibration and Verification for Force-Measuring Instruments

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