Skip to main content

Code of Federal Regulations Title 46. Shipping § 46.164.141–3 Testing, marking, and inspection requirements

Welcome to FindLaw's Cases & Codes, a free source of state and federal court opinions, state laws, and the United States Code. For more information about the legal concepts addressed by these cases and statutes, visit FindLaw's Learn About the Law.

(a) All plastic piping submitted for approval must meet the flame spread requirements of IMO Resolution A.653(16) as modified for pipes by IMO Resolution A.753(18) and IMO Resolution MSC.313(88) (all incorporated by reference, see § 164.141–2) except that:

(1) The test specimens need not be wrapped in aluminum foil;  and

(2) Testing need not be conducted on every pipe size. Testing may be conducted on piping sizes with the maximum and minimum wall thickness intended to be approved. This will qualify all piping sizes within the tested range.

(b) In order to receive approval for fire endurance, pipe must be tested as indicated in IMO Resolution A.753(18) and IMO Resolution MSC.313(88). When satisfying the requirements for L1 or L2 service, the pipe will be approved for use in lesser service grades. The approval of piping systems of sizes different than those tested will be allowed as provided for in Table 164.141(a) of this subpart.

Table 164.141(a)—Approval of Piping Systems of Sizes Different Than Tested

Size * tested, inches

Minimum size * approved

Maximum size * approved, inches

0 to ≤2

Size Tested

Size Tested.

>2 to ≤6

Size Tested


>6 to ≤12

Size Tested


>12 to ≤24

Size Tested


>24 to ≤36

Size Tested


>36 to ≤48

Size Tested


* Nominal outside diameter

(c) To be approved for smoke and toxicity requirements, piping systems must meet the requirements of Annex 1, Part 2 of the FTP Code (incorporated by reference, see § 164.141–2) with the following modifications:

(1) Plastic piping meeting paragraph 2.2 of Annex 2 of the FTP Code as having very low flame spread when tested to Part 5 are deemed to meet the smoke and toxicity requirements without testing to Part 2.

(2) Testing need only be conducted on piping sizes with the maximum and minimum wall thicknesses intended to be approved.

(3) The test sample should be fabricated by cutting pipes lengthwise into individual sections and then assembling the sections into a test sample as representative as possible of a flat surface. All cuts should be made normal to the pipe wall.

(4) The number of sections that must be assembled together to form a square test sample with sides measuring 3 inches, should be that which corresponds to the nearest integral number of sections which will result in a test sample with an equivalent linearized surface width between 3 and 3 1/2 inches. The surface width is defined as the measured sum of the outer circumference of the assembled pipe sections normal to the lengthwise sections.

(5) The test samples should be mounted on calcium silicate board and held in place by the edges of the test frame and, if necessary, by wire. There should be no gaps between individual sections and the samples should be constructed so that the edges of two adjacent sections coincide with the centerline of the test holder.

(6) The space between the concave unexposed surface of the test sample and the surface of the calcium silicate backing should be left void.

(7) The void space between the top of the exposed test surface and the bottom edge of the sample holder frame should be filled with a high temperature insulating wool where the pipe extends under the frame.

(8) When the pipes are to include fireproofing or coatings, the composite structure consisting of the segmented pipe wall and fireproofing shall be tested and the thickness of the fireproofing should be the minimum thickness specified for the intended usage.

(9) Test samples should be oriented in the apparatus such that the pilot burner flame will be normal to the lengthwise piping sections.

(d) Where required to be approved, piping systems must comply with the non-metallic materials requirements in 46 CFR 56.60–25(a)(1).

(e) All testing and inspections required by this subpart, except as allowed by paragraph (b) of this section, must be performed by an independent laboratory accepted by the Coast Guard under subpart 159.010 of this chapter. A list of independent laboratories accepted as meeting subpart 159.010 of this chapter is available online at

(f) The independent laboratory must perform an initial factory inspection to select the test specimens and establish the materials of construction, chemical make-up, dimensions, tolerances, and other related factors needed to confirm product consistency during follow-up production inspections.

(g) Production inspections must be performed by the independent laboratory in accordance with subpart 159.007 of this chapter at least annually to confirm that no changes have been made to the product that may adversely affect its fire performance as plastic piping.

(h) The independent laboratory must prepare production inspection procedures and a report of the results of the fire testing program, and must furnish the manufacturer with three copies of each upon completion of the required testing.

(i) Materials approved under this subpart must be shipped in packaging that is clearly marked with the name of the manufacturer, product designation, date of manufacture, batch or lot number, and Coast Guard type approval number.

Cite this article: - Code of Federal Regulations Title 46. Shipping § 46.164.141–3 Testing, marking, and inspection requirements - last updated October 03, 2022 |

FindLaw Codes may not reflect the most recent version of the law in your jurisdiction. Please verify the status of the code you are researching with the state legislature or via Westlaw before relying on it for your legal needs.

Was this helpful?

Thank you. Your response has been sent.

Copied to clipboard