CFR > Title 46 > Chapter I > Part 52 > § 52.01-120. Safety valves and safety relief valves (modifies PG-67 through PG-73)
Current as of: Oct. 2009
(a)(1) Boiler safety valves and safety relief valves must be as indicated in PG-67 through PG-73 of section I of the ASME Boiler and Pressure Vessel Code (incorporated by reference; see 46 CFR 52.01-1) except as noted otherwise in this section.
(2) A safety valve must:
(i) Be stamped in accordance with PG-110 of section I of the ASME Boiler and Pressure Vessel Code;
(ii) Have its capacity certified by the National Board of Boiler and Pressure Vessel Inspectors;
(iii) Have a drain opening tapped for not less than 6mm (1/4 in.) NPS; and
(iv) Not have threaded inlets for valves larger than 51mm (2 in.) NPS.
(3) On river steam vessels whose boilers are connected in batteries without means of isolating one boiler from another, each battery of boilers shall be treated as a single boiler and equipped with not less than two safety valves of equal size.
(4) (Modifies PG-70.) The total rated relieving capacity of drum and superheater safety valves as certified by the valve manufacturer shall not be less than the maximum generating capacity of the boiler which shall be determined and certified by the boiler manufacturer. This capacity shall be in compliance with PG-70 of section I of the ASME Boiler and Pressure Vessel Code.
(5) In the event the maximum steam generating capacity of the boiler is increased by any means, the relieving capacity of the safety valves shall be checked by an inspector, and, if determined to be necessary, valves of increased relieving capacity shall be installed.
(6) (Modifies PG-67.) Drum safety valves shall be set to relieve at a pressure not in excess of that allowed by the Certificate of Inspection. Where for any reason this is lower than the pressure for which the boiler was originally designed and the revised safety valve capacity cannot be recomputed and certified by the valve manufacturer, one of the tests described in PG-70(3) of section I of the ASME Boiler and Pressure Vessel Code shall be conducted in the presence of the Inspector to insure that the relieving capacity is sufficient at the lower pressure.
(7) On new installations the safety valve nominal size for propulsion boilers and superheaters must not be less than 38mm (11/2 in.) nor more than 102mm (4 in.). Safety valves 38mm (11/2 in.) to 114mm (41/2 in.) may be used for replacements on existing boilers. The safety valve size for auxiliary boilers must be between 19mm (3/4 in.) and 102mm (4 in.) NPS. The nominal size of a safety valve is the nominal diameter (as defined in 56.07-5(b)) of the inlet opening.
(8) Lever or weighted safety valves now installed may be continued in use and may be repaired, but when renewals are necessary, lever or weighted safety valves shall not be used. All such replacements shall conform to the requirements of this section.
(9) Gags or clamps for holding the safety valve disk on its seat shall be carried on board the vessel at all times.
(10) (Modifies PG-73.2.) Cast iron may be used only for caps and lifting bars. When used for these parts, the elongation must be at least 5 percent in 51mm (2 inch) gage length. Nonmetallic material may be used only for gaskets and packing.
(b)(1) (Modifies PG-68.) Superheater safety valves shall be as indicated in PG-68 of section I of the ASME Boiler and Pressure Vessel Code except as noted otherwise in this paragraph.
(2) The setting of the superheater safety valve shall not exceed the design pressure of the superheater outlet flange or the main steam piping beyond the superheater. To prevent damage to the superheater, the drum safety valve shall be set at a pressure not less than that of the superheater safety valve setting plus 5 pounds minimum plus approximately the normal load pressure drop through the superheater and associated piping, including the controlled desuperheater if fitted. See also Sec. 52.01-95(b) (1).
(3) Drum pilot actuated superheater safety valves are permitted provided the setting of the pilot valve and superheater safety valve is such that the superheater safety valve will open before the drum safety valve.
(c)(1) (Modifies PG-71.) Safety valves shall be installed as indicated in PG-71 of section I of the ASME Boiler and Pressure Vessel Code except as noted otherwise in this paragraph.
(2) The final setting of boiler safety valves shall be checked and adjusted under steam pressure and, if possible, while the boiler is on the line and the steam is at operating temperatures, in the presence of and to the satisfaction of a marine inspector who, upon acceptance, shall seal the valves. This regulation applies to both drum and superheater safety valves of all boilers.
(3) The safety valve body drains required by PG-71 of section I of the ASME Boiler and Pressure Vessel Code shall be run as directly as possible from the body of each boiler safety valve, or the drain from each boiler safety valve may be led to an independent header common only to boiler safety valve drains. No valves of any type shall be installed in the leakoff from drains or drain headers and they shall be led to suitable locations to avoid hazard to personnel.
(d)(1) (Modifies PG-72.) The operation of safety valves shall be as indicated in PG-72 of section I of the ASME Boiler and Pressure Vessel Code except as noted in paragraph (d)(2) of this section.
(2) (Modifies PG-73.) The lifting device required by PG-73.1.3 of section I of the ASME Boiler and Pressure Vessel Code shall be fitted with suitable relieving gear so arranged that the controls may be operated from the fireroom or engineroom floor.
[CGFR 68-82, 33 FR 18815, Dec. 18, 1968, as amended by CGD 81-79, 50 FR 9433, Mar. 8, 1985; USCG-2003-16630, 73 FR 65161, Oct. 31, 2008]________________________________________________________________________
State Laws: Watercraft| Alabama | Alabama Code > Title 33 > Chapter 5 - Registration And Operation Of Vessels | | Alabama Code > Title 33 > Chapter 6 - Discharge Of Litter And Sewage From Watercraft | | Alabama Code > Title 33 > Chapter 6A - Recreational Vessel And Residence Boat Sewage Discharges Regulated | | Alaska | Alaska Statutes Chapter 05.25 - Watercraft | | Alaska Statutes Chapter 30.30 - Abandoned And Derelict Vessels | | Arizona | Arizona Laws > Title 5 > Chapter 3 - Boating And Water Sports | | California | California Harbors and Navigation Code > Division 3 - Vessels | | California Harbors and Navigation Code > Division 4 - Masters, Crews And Cargoes | | California Harbors and Navigation Code > Division 5 - Pilots For Monterey Bay And The Bays Of San Francisco, San Pablo, And Suisun | | Connecticut | Connecticut General Statutes > Title 15 > Chapter 268 - Boating | | Delaware | Delaware Code Title 23 > Chapter 21 - Motorboats | | Delaware Code Title 23 > Chapter 22 - Boating Safety | | Delaware Code Title 23 > Chapter 23 - Operation Of A Vessel Or Boat While Under The Influence Of Intoxicating Liquor And/Or Drugs | | Delaware Code Title 23 > Chapter 24 - Exemptions From Civil Liability For Rendering Vessel Traffic Information Services | | Florida | Florida Statutes > Title XXIV - Vessels | | Florida Regulations Chapter 61B-60 - Yacht and Ship Brokers | | Florida Regulations > Division 68D - Vessel Registration and Boating Safety | | Idaho | Idaho Code Title 67 > Chapter 70 - Idaho Safe Boating Act | | Illinois | Illinois Compiled Statutes > 625 ILCS 45 - Boat Registration and Safety Act | | Indiana | Indiana Code > Title 9 > Article 31 - Watercraft Titling And Registration | | Indiana Code > Title 25 > Article 28 - Boat Pilots | | Kansas | Kansas Statutes > Chapter 32 > Article 11 - Boating And Water Activities | | Maine | Maine Revised Statutes > Title 10 > Chapter 204-B - Watercraft Manufacturers, Distributors And Dealers | | Maine Revised Statutes > Title 10 > Chapter 212-A - Maine Marina And Boatyard Storage Act | | Maine Revised Statutes > Title 10 > Chapter 627 - Vessels | | Maine Revised Statutes > Title 12 > Chapter 935 - Watercraft And Airmobiles | | Maine Revised Statutes Title 23 > Chapter 412 - Waterborne Transportation | | Massachusetts | Massachusetts General Laws > Part I > Title XIV > Chapter 90B - Motorboats And Other Vessels | | Michigan | Michigan Laws > Chapter 123 > Act 68 of 1957 - Regulation Of Houseboats | | Michigan Laws > Chapter 445 > Act 88 of 1989 - Watercraft And Outboard Motor Manufacturers, Distributors, And Dealers | | Minnesota | Minnesota Statutes Chapter 86B - Water Safety, Watercraft, and Watercraft Titling | | Missouri | Missouri Laws > Title XIX > Chapter 306 - Watercraft Regulation and Licensing--State Water Patrol | | Nevada | Nevada Revised Statutes > Chapter 488 - Watercraft | | New Hampshire | New Hampshire Revised Statutes > Chapter 270-A - Use Of Houseboats | | New Hampshire Revised Statutes > Chapter 270-B - Abandoned Boats | | New Hampshire Revised Statutes > Chapter 270-D - Boating And Water Safety On New Hampshire Public Waters | | New Hampshire Revised Statutes > Chapter 270-E - Vessel Registration And Numbering | | New Mexico | New Mexico Statutes Chapter 66 > Article 12 - Boating | | New Mexico Statutes Chapter 66 > Article 13 - Boating While Intoxicated | | New York | New York Laws - General Business > Article 38 - Vessel Dealer Agreements | | New York | New York Laws > General Business > Article 38 - Vessel Dealer Agreements | | North Carolina | North Carolina General Statutes Chapter 75A - Boating and Water Safety | | North Dakota | North Dakota Code > Chapter 20.1-13 - Boating Regulation | | North Dakota Code > Chapter 20.1-13.1 - Intoxication Testing of Boat Operators | | North Dakota Code > Chapter 20.1-17 - Aquatic Nuisance Species | | Ohio | Ohio Code > Title 15 > Chapter 1547 - Watercraft And Waterways | | Ohio Code > Title 15 > Chapter 1548 - Watercraft Certificates Of Title | | Ohio Code > Title 45 > Chapter 4585 - Actions Relating To Watercraft | | Oregon | Oregon Statutes > Title 61 - Small Watercraft | | Rhode Island | Rhode Island General Laws > Chapter 46-8. Registration of Outboard Motors | | Rhode Island General Laws > Chapter 46-9. Pilots – Rhode Island Sound, Narragansett Bay, Sakonnet River, and Tributaries | | Rhode Island General Laws > Chapter 46-9.1. Pilots–Block Island Sound | | Rhode Island General Laws > Chapter 46-22. Regulation of Boats | | Rhode Island General Laws > Chapter 46-22.1. Uniform Boat Title Act | | Rhode Island General Laws > Chapter 46-22.2. Alcohol Boating Safety Act | | Rhode Island General Laws > Chapter 46-27. Personal Watercraft Safety Act | | South Carolina | South Carolina Code > Title 29 > Chapter 9 - Liens On Ships And Vessels | | South Carolina Code > Title 50 > Chapter 21 - Equipment And Operation Of Watercraft | | South Carolina Code > Title 50 > Chapter 23 - Watercraft And Outboard Motors | | South Carolina Code > Title 50 > Chapter 25 - Boating And Surfing At Particular Localities | | South Dakota | South Dakota Laws > Title 32 > Chapter 03A - Title, Registration And Taxation Of Boats | | South Dakota Laws > Title 32 > Chapter 07B - Regulation Of Boat Dealers | | South Dakota Laws > Title 42 > Chapter 8 - Watercraft | | Tennessee | Tennessee Code > Title 69 > Chapter 9 - Boating Regulation | | Texas | Texas Civil Statutes > Title 132 > Chapter 19 - Boat Or Motor Manufacturers, Distributors, And Dealers | | Utah | Utah Code > Title 73 > Chapter 18 - State Boating Act | | Utah Code > Title 73 > Chapter 18 - Boating - Litter and Pollution Control | | Utah Code > Title 73 > Chapter 18 - Water Safety | | Utah Code > Title 73 > Chapter 18 - Financial Responsibility of Motorboat Owners and Operators Act | | Vermont | Vermont Statutes > Title 25 > Chapter 1 - Operation of Vessels | | Virginia | Virginia Code Title 29.1 > Chapter 7 - Boating Laws | | Virginia Code Title 29.1 > Chapter 8 - Watercraft Dealer Licensing Act | | Virginia Code Title 62.1 > Chapter 18 - Protection of Aids to Navigation | | Wisconsin | Wisconsin Statutes > Chapter 30 > Subchapter V - Regulation Of Boating |
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