Abstract

This specification establishes the performance characteristics required for mechanically attached fittings (MAFs) for use in piping and tubing systems. These fittings directly attach to pipe or tube by mechanical deformation of the pipe or tube or fitting, or a combination thereof, creating a seal and a restrained joint. process. MAFs covered here are classified into the following design types: Type I radially swaged MAF (permanent); Type II flared MAF (separable); Type III flareless (bite-type) MAF (separable); Type IV grip-type MAF (separable); Type V shape memory alloy (SMA) MAF (permanent); and Type VI axially swaged MAF (permanent). Moreover, the MAFs shall be made from on or more of the following material grade: Grade A carbon steel; Grade B stainless steel; Grade C nickel-copper; Grade D copper-nickel; Grade E brass; and Grade F nickel titanium. The MAFs shall also be grouped into ten classes according to their pressure ratings. The standard qualification tests to which the MAFs shall perform satisfactorily are pneumatic proof test, hydrostatic proof test, impulse test, flexure fatigue test, tensile test, hydrostatic burst test, repeated assembly test, rotary flexure test, and mercurous nitrate test. Successful completion of the tests described constitutes completion of the technical portion of the qualification

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

1. Scope

1.1 This specification establishes the performance characteristics required for mechanically attached fittings (MAFs) for use in piping and tubing systems. These fittings directly attach to pipe or tube by mechanical deformation of the pipe or tube or fitting, or a combination thereof, creating a seal and a restrained joint. The seal may be created via the mechanical deformation or created independently. Successful completion of the tests described constitutes completion of the technical portion of the qualification process.

1.2 Supplementary requirements are provided for use when additional testing or inspection is desired. These shall apply only when specified in part or whole by the purchaser in the order. Unless otherwise specified, U.S. Navy contracts shall invoke the supplementary requirements in whole.

1.3 Unless specific MAF types are specified, the term MAF shall apply to all types described herein.

1.4 The tests specified in Section 13 and described in Annex A1 and Supplementary Requirements are applicable only to ascertain the performance characteristics of MAFs. These tests are not intended for use in the evaluation of non-MAF products.

1.5 A fire performance test is specified in Supplementary Requirement S7. This test provides general guidelines to determine the responsiveness of MAFs when subjected to fire. This test should not be considered for use to evaluate non-MAF products.

1.6 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.7 The following safety hazards caveat applies only to the tests listed in Section 13 and the tests described in the Supplementary Section and the Annex of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

A105/A105M Specification for Carbon Steel Forgings for Piping Applications

A106/A106M Specification for Seamless Carbon Steel Pipe for High-Temperature Service

A108 Specification for Steel Bar, Carbon and Alloy, Cold-Finished

A109/A109M Specification for Steel, Strip, Carbon (0.25 Maximum Percent), Cold-Rolled

A167 Specification for Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and Strip

A182/A182M Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service

A213/A213M Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes

A234/A234M Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service

A240/A240M Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications

A249/A249M Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes

A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels

A269 Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service

A276 Specification for Stainless Steel Bars and Shapes

A312/A312M Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes

A380 Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems

A403/A403M Specification for Wrought Austenitic Stainless Steel Piping Fittings

A450/A450M Specification for General Requirements for Carbon and Low Alloy Steel Tubes

A479/A479M Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels

A530/A530M Specification for General Requirements for Specialized Carbon and Alloy Steel Pipe

A564/A564M Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes

A576 Specification for Steel Bars, Carbon, Hot-Wrought, Special Quality

A766/A766M Specification for Forgings, Leaded, and Resulfurized Carbon Steel, for Pressure-Containing Applications

B16/B16M Specification for Free-Cutting Brass Rod, Bar and Shapes for Use in Screw Machines

B21/B21M Specification for Naval Brass Rod, Bar, and Shapes

B111/B111M Specification for Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock

B117 Practice for Operating Salt Spray (Fog) Apparatus

B122/B122M Specification for Copper-Nickel-Tin Alloy, Copper-Nickel-Zinc Alloy (Nickel Silver), and Copper-Nickel Alloy Plate, Sheet, Strip, and Rolled Bar

B124/B124M Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes

B154 Test Method for Mercurous Nitrate Test for Copper Alloys

B164 Specification for Nickel-Copper Alloy Rod, Bar, and Wire

B251 Specification for General Requirements for Wrought Seamless Copper and Copper-Alloy Tube

B371/B371M Specification for Copper-Zinc-Silicon Alloy Rod

B564 Specification for Nickel Alloy Forgings

B633 Specification for Electrodeposited Coatings of Zinc on Iron and Steel

B696 Specification for Coatings of Cadmium Mechanically Deposited

B766 Specification for Electrodeposited Coatings of Cadmium

E511 Test Method for Measuring Heat Flux Using a Copper-Constantan Circular Foil, Heat-Flux Transducer

E1529 Test Methods for Determining Effects of Large Hydrocarbon Pool Fires on Structural Members and Assemblies

Keywords

axially swaged; bite-type; elastic strain preload (esp); fittings; flared; flareless; grip type; mechanically attached fittings (MAFs); piping; radially swaged; shape memory alloy (SMA); tubing; Axially swaged fitttings; Corrosion--marine (shipbuilding) materials; Displacement; Elastic strain preload (ESP); Elevated temperature tests; Fatigue; Fire fighting systems--marine applications; Heat flux; Hydrostatic pressure test; Impact testing--marine (shipbuilding) materials/applications; Impulse measurement/testing; Leak testing; Mechanically attached fittings (MAF); Mercurous nitrate test; Performance--marine (shipboard) materials/applications; Pipe fittings; Pneumatic proof test; Pressure testing--marine (shipbuilding) applications; Rotary flex test; Shape memory alloys (SMA); Soak testing; Steel fittings--specifications; Tensile properties/testing--metallic materials; Thermal analysis (TA); Torsion testing; Vibration test

ICS Code

ICS Number Code 23.060.01 (Valves in general)

DOI: 10.1520/F1387-99R12

ASTM International is a member of CrossRef.

ASTM F1387