46 CFR 56.97-25 - Preparation for testing (reproduces 137.2).

§ 56.97-25 Preparation for testing (reproduces 137.2).

(a)Exposure of joints. All joints including welds must be left uninsulated and exposed for examination during the test.

(b)Addition of temporary supports. Piping systems designed for vapor or gas may be provided with additional temporary supports, if necessary, to support the weight of the test liquid.

(c)Restraint or isolation of expansion joints. Expansion joints must be provided with temporary restraint, if required for the additional pressure load under test, or they must be isolated from the test.

(d)Isolation of equipment not subjected to pressure test. Equipment that is not to be subjected to the pressure test must be either disconnected from the piping subassembly or system or isolated by a blank flange or similar means. Valves may be used if the valve with its closure is suitable for the proposed test pressure.

(e)Treatment of flanged joints containing blinds. Flanged joints at which blinds are inserted to blank off other equipment during the test need not be tested.

(f)Precautions against test medium expansion. If a pressure test is to be maintained for a period of time and the test medium in the system is subject to thermal expansion, precautions must be taken to avoid excessive pressure. A small relief valve set to 1 1/3 times the test pressure is recommended during the pressure test.

[CGD 73-254, 40 FR 40167, Sept. 2, 1975]

This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.

This list is taken from the Parallel Table of Authorities and Rules provided by GPO [Government Printing Office].

It is not guaranteed to be accurate or up-to-date, though we do refresh the database weekly. More limitations on accuracy are described at the GPO site.

United States Code
Presidential Documents

Executive Order ... 12234

Executive Order ... 12777

Title 46 published on 2015-12-02

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 46 CFR Part 56 after this date.

  • 2016-07-22; vol. 81 # 141 - Friday, July 22, 2016
    1. 81 FR 48220 - Harmonization of Standards for Fire Protection, Detection, and Extinguishing Equipment
      GPO FDSys XML | Text
      Final rule.
      This final rule is effective August 22, 2016. The incorporation by reference of certain publications listed in the rule is approved by the Director of the Federal Register on August 22, 2016.
      33 CFR Parts 140, 145, 148, and 149