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(R2021) MIL-PRF-32531A-002.pdf
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(R2021) MIL-PRF-32531A-002.pdf
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Comments, suggestions, or questions on this document should be addressed to: AFLCMC/EZSS,
2145 Monahan Way, Area B, Bldg 28, Wright-Patterson AFB, OH 45433 or email to
ENGINEERING.ST[email protected]. Since contact information can change, you may want to verify
the currency of this address information using the ASSIST Online database at https://assist.dla.mil/.
AMSC N/A FSC 6635
MIL-PRF-32531A
18 January 2021
SUPERSEDING
MIL-PRF-32531
7 August 2015
PERFORMANCE SPECIFICATION
FLUORESCENT PENETRANT INSPECTION (FPI) UNITS,
SEPARATE MODULAR STATION TYPES
This specification is approved for use by all
Departments and Agencies of the Department of Defense.
1. SCOPE
1.1 Scope. This specification covers fluorescent penetrant inspection (FPI) units for
nondestructive inspection/testing using the liquid penetrant method.
1.2 Classification. The FPI units are of the following types, sizes, classes and forms as
specified (see 6.2).
Types. The types of FPI units are as follow:
Type I Water washable (self-emulsified) with dry developer.
Type II Post-emulsified with aqueous developer.
Type III Post-emulsified with dry developer.
Type IV Solvent-removable (inspection station only).
NOTE: Type designations of FPI units do not match ASTM E1417/E1417M type
designations for FPI processes.
1.2.1 Sizes. The sizes of the FPI units are as shown in table I. Size 1 is no longer used, but
retained for other sizes to match prior acquisition documents. The designation refers to Penetrant
Testing (PT) followed by the frame size in inches. Length dimensions are left-to-right and width
dimensions are front-to-back.
INCH-POUND
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MIL-PRF-32531A
2
TABLE I. FPI unit sizes.
Size Designation Frame Size
Minimum Useable Tank Size
1 Not used N/A
N/A
2 PT-24 24" long x 34" wide x 36"
height
19" long x 29" wide x 26"
deep
3 PT-36 36" long x 34" wide x 36"
height
31" long x 29" wide x 26"
deep
4
PT-48S
(short)
48" long x 34" wide x 36"
height
43" long x 29" wide x 26"
deep
5 PT-48 48" long x 34" wide x 36"
height
43" long x 29" wide x 26"
deep
6 PT-72 72" long x 50" wide x 36"
height
67" long x 44" wide x 26"
deep
1.2.2 Classes. FPI units are in the following classes:
Class A - unpowered tanks.
Class B - pneumatically-powered tank lifts.
NOTE: Class A units are often used with an overhead hoist/conveyor.
1.2.3 Forms. The FPI units will be in two forms:
Standard form; left-to-right processing, beginning with the penetrant tank.
Reverse form; right-to-left processing, beginning with the penetrant tank.
1.3 Part or Identifying Number (PIN). PINS to be used for FPI units acquired to this
specification are created as follows:
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MIL-PRF-32531A
3
1.4 National Stock Number (NSN). Below is a list of NSN’s, part numbers and cage codes.
NSN PART NUMBER CAGE CODE
6635-01-483-0552RN M32531-II2ASF 81348
6635-01-483-0548RN M32531-II3ASF 81348
6635-01-483-0559RN M32531-II4ASF 81348
6635-00-110-9463RN M32531-II5ASF 81348
6635-00-249-5341RN M32531-II6ASF 81348
2. APPLICABLE DOCUMENTS
2.1 General. The documents listed in this section are specified in sections 3 and 4 of this
specification. This section does not include documents cited in other sections of this specification or
recommended for additional information or as examples. While every effort has been made to ensure
the completeness of this list, document users are cautioned that they must meet all specified
requirements of documents cited in sections 3 and 4 of this specification, whether or not they are
listed.
2.2 Government documents.
2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and
handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the
issues of these documents are those cited in the solicitation or contract.
DEPARTMENT OF DEFENSE SPECIFICATIONS
MIL-PRF-20696 - Cloth, Waterproof, Weather Resistant.
(Copies of this document are available online at https://quicksearch.dla.mil.)
2.2.2 Other Government documents, drawings, and publications. The following other
Government documents, drawings, and publications form a part of this document to the extent
specified herein. Unless otherwise specified, the issues of these documents are those cited in the
solicitation or contract.
Federal Acquisition Regulation (FAR)
FAR 23.404 - Agency Affirmative Procurement Programs
(Copies of FAR and DFARS may be obtained at https://www.ecfr.gov/.)
AIR FORCE TECHNICAL ORDER (AFTO)
TO 33B-1-1 - Nondestructive Inspection Methods,
Basic Theory (Joint TO 33B-1-1,
NAVAIR 01-1A-16-1, TM 1-1500-335-23)
(Copies of this document are available online at
https://www.tinker.af.mil/Home/Technical-Orders/)
2.3 Non-Government publications. The following documents form a part of this document to
the extent specified herein. Unless otherwise specified, the issues of these documents are those cited
in the solicitation or contract.
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MIL-PRF-32531A
4
ASTM INTERNATIONAL
ASTM A123 / - Standard Specification for Zinc (Hot-Dip
A123M Galvanized) Coatings on Iron and Steel Products
(DoD Adopted)
ASTM A240/ - Standard Specification for Chromium and Chromium
A240M Nickel Stainless Steel Plate, Sheet, and Strip for
Pressure Vessels and for General Applications
(DoD Adopted)
ASTM E1210 - Standard Practice for Fluorescent Liquid Penetrant
Testing Using the Hydrophilic Post Emulsification
-Process
ASTM E1417 - Standard Practice for Liquid Penetrant Testing
/E1417M (DoD Adopted)
ASTM E3022 - Standard Practice for Measurement of Emission
Characteristics and Requirements for LED UV
-A Lamps Used in Fluorescent Penetrant and
Magnetic Particle Testing, 2018 or later edition
(Copies of these documents are available from www.astm.org.)
THE AMERICAN WELDING SOCIETY
AWS D9.1 - Sheet Metal Welding Code
AWS D17.1 - Specification for Fusion Welding for
Aerospace Applications
(Copies of this document are available from www.aws.org.)
NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)
NFPA 70 - National Electrical Code, Article 500, Hazardous
(Classified) Locations, Classes I, II, and III,
Divisions 1 and 2 (DoD Adopted)
(Copies of this document are available from www.nfpa.org.)
THE SOCIETY FOR PROTECTIVE COATINGS (SSPC)
SSPC-Paint 20 - Paint Specification No. 20 Zinc-Rich Coating
Type I – Inorganic and Type II – Organic
(DoD Adopted)
(Copies of this document are available from at www.sspc.org.)
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a
conflict between the text of this document and the references cited herein, the text of this document
takes precedence. Nothing in this document, however, supersedes applicable laws and regulations
unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), a sample shall be subjected to first article
inspection in accordance with 4.4.
3.2 Design and construction. The FPI units shall be designed and constructed to perform
complete and efficient penetrant inspections of parts and assemblies in accordance with ASTM
E1210 and ASTM E1417/E1417M. They shall be constructed to hold aerospace components or
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