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CFR › Title 46 › Chapter I › Subchapter F › Part 56 › Subpart 56.50 › Section 56.50-25

46 CFR 56.50-25 - Safety and relief valve escape piping.

There is 1 rule appearing in the Federal Register for 46 CFR 56. Select the tab below to view, or View eCFR (GPOAccess)
§ 56.50-25
Safety and relief valve escape piping.
(a) Escape piping from unfired steam generator, boiler, and superheater safety valves shall have an area of not less than that of the combined areas of the outlets of all valves discharging thereto and shall be led as near vertically as practicable to the atmosphere.
(b) Expansion joints or flexible pipe connections shall be fitted in escape piping. The piping shall be adequately supported and installed so that no stress is transmitted to the safety valve body.
(c) Safety or relief valve discharges, when permitted to terminate in the machinery space, shall be led below the floorplates or to a remote position to minimize the hazardous effect of the escaping steam.
(d) The effect of the escape piping on the operation of the relief device shall be considered. The back pressure in the escape piping from the main propulsion steam generator should not exceed 10 percent of the relief device setting unless a compensated relief device is used. Back pressure must be calculated with all relief valves which discharge to a common escape pipe relieving simultaneously at full capacity.
[CGFR 68-82, 33 FR 18843, Dec. 18, 1968, as amended by CGD 77-140, 54 FR 40608, Oct. 2, 1989; CGD 95-012, 60 FR 48050, Sept. 18, 1995]

Title 46 published on 2012-10-01

The following are only the Rules published in the Federal Register after the published date of Title 46.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2013-02-27; vol. 78 # 39 - Wednesday, February 27, 2013
    1. 78 FR 13243 - Updates to Standards Incorporated by Reference; Reapproved ASTM Standards; Technical Amendment
      GPO FDSys XML | Text
      DEPARTMENT OF HOMELAND SECURITY, Coast Guard
      Final rule.
      This rule is effective March 29, 2013. The incorporation by reference of certain publications listed in the rule is approved by the Director of the Federal Register on March 29, 2013.
      33 CFR Parts 126, 127, 154, and 155

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
USC : Title 33 - NAVIGATION AND NAVIGABLE WATERS

§ 1321 - Oil and hazardous substance liability

§ 1509 - Marine environmental protection and navigational safety

USC : Title 43 - PUBLIC LANDS

§ 1333 - Laws and regulations governing lands

Presidential Documents

Executive Order ... 12777

Title 46 published on 2012-10-01

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

  • 2013-02-27; vol. 78 # 39 - Wednesday, February 27, 2013
    1. 78 FR 13243 - Updates to Standards Incorporated by Reference; Reapproved ASTM Standards; Technical Amendment
      GPO FDSys XML | Text
      DEPARTMENT OF HOMELAND SECURITY, Coast Guard
      Final rule.
      This rule is effective March 29, 2013. The incorporation by reference of certain publications listed in the rule is approved by the Director of the Federal Register on March 29, 2013.
      33 CFR Parts 126, 127, 154, and 155