effect on the date safety valves are manufactured shall form a part of the regulations of this subpart (see §§ 2.75-17 through 2.75-19 of Subchapter A (Procedures Applicable to the Public) and Subpart 50.15 of Subchapter F (Marine Engineering) of this chapter):

(1) ASME (American Society of Mechanical Engineers) Code (see § 50.15-5 of Subchapter F (Marine Engineering) of this chapter): The following paragraph from section IV of the ASME Code:

(1) HG-402, flow tests, see §§ 162.012-6(c) and 162.012-7(c).

(c) A copy of this specification and the referenced material listed in this section shall be kept on file by the manufacturer, together with the approved plans, specifications and certificate of approval. It is the manufacturer's responsibility to have the latest issue, including addenda and changes, of the referenced material on hand when manufacturing equipment under this subpart.

(1) The ASME Code may be obtained from the American Society of Mechanical Engineers, United Engineering Center, 345 East 47th Street, New York, N.Y. 10017.

(Sec. 552, 80 Stat. 383, as amended; 5 U.S.C. 552) [CGFR 68-82, 33 F.R. 18905, Dec. 18, 1968]

This specification covers requirements for the design, construction and testing of spring loaded safety valves intended for use on steam heating boilers and unfired steam generators designed for pressures not exceeding 30 pounds per square inch and installed on merchant vessels subject to inspection by the Coast Guard.

[CGFR 68-82, 33 F.R. 18905, Dec. 18, 1968] § 162.012-3 Materials.

(a) The materials used in the manufacture of safety valves shall conform to the applicable requirements of Subchapter F (Marine Engineering), except as otherwise specified in this subpart.

(b) Bodies of safety valves may be made of forged steel, cast steel, malleable iron, cast iron, cast bronze, or of such other equivalent material as may be approved by the Commandant.

(c) The seats and disks shall be of suitable corrosion resistant material. Seats or disks of cast iron or mallable

iron are prohibited. Springs shall be of best quality spring steel consistent with the design of the valve and the service requirements.

(d) Non-metallic material except for gaskets and packing is not permitted in the construction of the safety valves, as pressure parts.

[CGFR 52-43, 17 F.R. 9538, Oct. 18, 1952] § 162.012-4 Construction and work. manship.

(a) Safety valves shall be of the direct spring-loaded pop type, or of such other type as may be approved by the Commandant. Lever or weightloaded safety valves are prohibited.

(b) The nominal size of a safety valve shall be the inside diameter of the inlet opening to the individual valve disk. No safety valve shall be smaller than 34 inch nor larger than 4 inches nominal pipe size. Safety valves shall have flanged, welding end or screwed inlet and outlet connections. The inlet opening shall have an inside diameter equal to or greater than the seat diameter.

(c) All safety valves shall be so constructed that the failure of any part cannot obstruct the free and full discharge of steam from the valve.

(d) Safety valves shall be of the angle type fitted with side outlet discharge connections.

(e) Safety valves shall be constructed so that no shocks detrimental to the valve or boiler are produced when lifting or closing. Safety valves shall be designed to pop open instantly and reach full lift and capacity at the maximum accumulation. Valve closure after popping shall be clean and sharp. Safety valves shall operate satisfactorily without wiredrawing and chattering at any stage of operation.

(f) (1) Springs shall be so designed that they will not be compressed solid when the valve is discharging at the maximum rated relieving capacity.

(2) Springs used in safety valves shall not show a permanent set exceeding 1 percent of their free length 10 minutes after being released from a cold compression test closing the spring solid.

(3) Springs of safety valves except those for use on boilers set at 15 pounds per square inch may be reset for any pressures not more than 10 percent above or 10 percent below that for which the valve is marked. The springs of safety valves of boilers set at 15 pounds per

square inch shall not be reset at a higher pressure after they are adjusted by the manufacturer.

(g) Each safety valve shall have a suitable lifting device which will positively lift the disk from its seat at least 16 inch when there is no pressure on the boiler.

(h) Safety valves of 11⁄2 inches size and below shall be tapped for not less than 8-inch pipe and safety valves above 11⁄2 inches size shall be tapped for not less than 1/4-inch pipe size drain at the lowest point where liquid can collect. [CGFR 52-43, 17 F.R. 9538, Oct. 18, 1952]

§ 162.012–5 Marking.

(a) Each safety valve shall be plainly marked by the manufacturer in such a way that the markings will not be obliterated in service. The markings may be stamped or cast on the valve body or stamped or cast on a plate securely fastened to the body, and shall contain the following information:

(1) The name or identifying trademark of the manufacturer.

(2) Manufacturer's design or type number.

(1) For set pressures not exceeding 15 pounds per square inch, at 5 pounds per square inch over the set pressure.

(2) For set pressures exceeding 15 pounds per square inch, at 3 percent over the set pressure.

(b) Tests shall be made to determine the lift, popping and blowdown pressures, and the capacity of at least three valves each of three representative sizes of each design and type.

(c) Flow tests shall be conducted in accordance with paragraph HG-402 of section IV of the ASME Code.

[CGFR 68-82, 33 F.R. 18906, Dec. 18, 1968]

**Number to be assigned by the Comman

dant.

§ 162.012-7 Procedure for approval.

(a) General. Safety valves intended for use on heating boilers and unfired steam generators installed on vessels subject to Coast Guard inspection shall be approved by the Commandant (MMT), U.S. Coast Guard, Washington, D.C. 20591.

(b) Plan submittal. Manufacturers desiring to secure approval of a new design or type of safety valve shall submit drawings in triplicate clearly showing the design, together with material specifications of the components. In the event the design is changed after receiving initial approval, amended drawings shall be submitted to the Commandant for reapproval.

(c) Preapproval tests. (1) Before approval is granted, manufacturers shall have flow tests conducted in accordance with § 162.012-6. The manufacturer shall submit evidence that such tests have been conducted in the form of Certification of ASME Capacities by the National Board of Boiler and Pressure Vessel Inspectors, or by submitting a copy of flow test report ASME Form H-1, and a table of relieving capacities for each size valve for which approval is required. Such data shall be forwarded to the Commandant with plan submission.

(2) Reports of conducted tests on designs of safety valves different from those previously approved shall be submitted by the manufacturer when requesting approval for different designs.

[CGFR 68-82, 33 F.R. 18906, Dec. 18, 1968] Subpart 162.013-Relief Valves (Hot

Water Heating and Hot Water
Supply Boilers)

AUTHORITY NOTE: The provisions of this Subpart 162.013 issued under R.S. 4417a, as amended, 4418, as amended, 4426, as amended, 4433, as amended, 4488, as amended, 4491, as amended, secs. 1, 2, 49 Stat. 1544, 1545, as amended, sec. 3, 54 Stat. 347, as amended, sec. 3, 68 Stat. 675; 46 U.S.C. 391a, 392, 404, 411, 481, 489, 367, 1333, 50 U.S.C. 198; E.O. 11239, July 31, 1965, 30 F.R. 9671, 3 CFR, 1965 Supp.

tions of this subpart (see §§ 2.75-17 through 2.75-19 of Subchapter A (Procedures Applicable to the Public) and Subpart 50.15 of Subchapter F (Marine Engineering) of this chapter):

(1) ASME (American Society of Mechanical Engineers) Code (see § 50.15-5 of Subchapter F (Marine Engineering) of this chapter): The following paragraph from section IV of the ASME Code:

(1) HG-402, flow tests, see §§ 162.013-6(c) and 162.013-7(c).

(c) A copy of this specification and the referenced material listed in this section shall be kept on file by the manufacturer, together with the approved plans, specifications and certificate of approval. It is the manufacturer's responsibility to have the latest issue, including addenda and changes, of the referenced material on hand when manufacturing equipment under this subpart.

(1) The ASME Code may be obtained from the American Society of Mechanical Engineers, United Engineering Center, 345 East 47th Street, New York, N.Y. 10017.

(Sec. 552, 80 Stat. 383, as amended; 5 U.S.C. 552) [CGFR2 68-82, 33 F.R. 18906, Dec. 18, 1968]

§ 162.013-2 Scope.

(a) This specification covers requirements for the design, construction and testing of relief valves on hot water heating and hot water supply boilers designed for pressure not exceeding 30 pounds per square inch and installed on merchant vessels subject to inspection by the Coast Guard.

[CGFR 68-82, 33 F.R. 18906, Dec. 18, 1968] § 162.013-3 Materials.

(a) The materials used in the manufacture of relief valves shall conform to the applicable requirements of Subchapter F (Marine Engineering), except as otherwise specified in this subpart.

(b) Bodies of relief valves may be made of forged steel, cast steel, malleable iron, cast iron, or cast bronze, or of such other equivalent material as may be approved by the Commandant.

(c) The seats and disks shall be of material suitable to resist corrosion. Seats and disks of cast iron or malleable iron shall not be used. Non-metallic materials may be used in the construction of relief valves where approved by the Commandant, provided such mate

(a) Relief valves shall be of the spring-loaded type without guide disks on the pressure side of the valve, or of such other type as may be approved by the Commandant. Lever or weightloaded relief valves are prohibited.

(b) The nominal size of a relief valve shall be the inside diameter of the inlet opening to the individual valve disk. No relief valve shall be smaller than 34 inch nor larger than 4 inches nominal pipe size. The inlet opening shall have an inside diameter equal to or greater than the seat diameter. In no case shall the minimum opening through any part of the valve be less than 4 inch diameter or its equivalent area.

(c) All relief valves shall be so constructed that the failure of any part cannot obstruct the free and full discharge of liquid from the valve.

(d) Relief valves shall be of the angle type fitted with side outlet connections.

(e) (1) Springs shall be so designed that they will not be compressed solid when the valve is discharging at the maximum rated relieving capacity.

(2) Springs used in relief valves shall not show a permanent set exceeding 1 percent of their free length 10 minutes after being released from a cold compression test closing the spring solid.

(3) Springs shall not be reset for any pressures more than 10 percent above or 10 percent below that for which the valve is marked.

(f) Each relief valve shall have a suitable lifting device which will positively lift the disk from its seat at least 16 inch when there is no pressure on the boiler.

(g) Relief valves shall be so constructed that no shocks detrimental to the valve or boiler are produced when lifting or closing. The relief valves shall operate without pounding or pulsation and shall not chatter at any stage of operation.

[CGFR 52-43, 17 F.R. 9539, Oct. 18, 1952]

(6) Coast Guard approval number. The minimum wording shall be "USCG 162.013/**" or "USCG 162.013-**”. [CGFR 68-82, 33 F.R. 18906, Dec. 18, 1968] § 162.013-6 Flow rating tests.

(a) The maximum rated capacity of relief valves shall be determined by actual steam flow at a pressure of 10 percent over the set pressure but not less than 3 pounds per square inch. The tests shall be made with steam, and in a manner closely approximating actual operating conditions of steam boilers. For determining the B.t.u. discharge capacity of relief valves for hot water boilers, the weight of steam in pounds per hour shall be multiplied by 1,000.

(b) For relief valves with metallic discs, tests shall be made to determine the popping and blowdown pressures, and capacity of at least three valves each of three representative sizes of each design or type.

(c) Flow tests shall be conducted in accordance with paragraph HG-402 of section IV of the ASME Code.

[CGFR 68-82, 33 F.R. 18906, Dec. 18, 1968] § 162.013-7 Procedure for approval.

(a) General. Relief valves for use on hot water heating and hot water supply boilers installed on vessels subject to Coast Guard inspection shall be approved by the Commandant (MMT), U.S. Coast Guard, Washington, D.C. 20591.

(b) Plan submittal. Manufacturers desiring to secure approval of a new design or type of relief valve shall submit drawings in triplicate clearly show

**Number to be assigned by the Comman

dant.

ing the design of same together with material specifications of the component parts. In the event the design is changed, amended drawings shall be submitted to the Commandant for reapproval.

(c) Preapproval tests. (1) Before approval is granted, manufacturers of relief valves shall have flow tests conducted in accordance with § 162.013-6. The manufacturer shall submit evidence that such tests have been conducted in the form of certification of ASME Capacities by the National Board of Boiler and Pressure Vessel inspectors, or by submitting a copy of the flow test report, ASME form H-1 and a table of relieving capacities for each valve for which approval is requested. Such data shall be forwarded to the Commandant with plan submission.

(2) Reports of conducted tests on designs of relief valves different from those previously approved shall be submitted by the manufacturer when requesting approval for different designs.

[CGFR 68-82, 33 FR. 18907, Dec. 18, 1968] Subpart 162.014-Fusible Plugs for Merchant Vessels

AUTHORITY NOTE: The provisions of this Subpart 162.014 issued under R.S. 44178, as amended, 4418, as amended, 4426, as amended, 4433, as amended, 4488, as amended, 4491, as amended, secs. 1, 2, 49 Stat. 1544, 1545, as amended, sec. 3, 54 Stat. 347, as amended, sec. 3, 68 Stat. 675; 46 U.S.C. 3918, 392, 404, 411, 481, 489, 367, 1333, 50 U.S.C. 198; E.O. 11239, July 31, 1965, 30 F.R. 9671, 3 CFR, 1965 Supp.

SOURCE: The provisions of this Subpart 162.014 contained in CGFR 51-55, 16 F.R. 11965, Nov. 28, 1951, unless otherwise noted. § 162.014-1 Applicable specifications, and referenced material.

(a) Specifications. The following specifications, of the issue in effect on the date fusible plugs are manufactured, shall form a part of the regulations of this subpart (see §§ 2.75-17 through 2.75-19 of Subchapter A (Procedures Applicable to the Public) and Subpart 50.15 of Subchapter F (Marine Engineering) of this chapter:

(b) Copies on file. A copy of this specification and the referenced material listed in this section shall be kept on file by the manufacturer, together with copies of letters of acceptance issued by the Coast Guard for heats of fusible plugs meeting Coast Guard requirements.

(1) The ASTM specifications may be obtained from the American Society for Testing and Materials, 1916 Race Street, Philadelphia, Pa. 19108.

(Sec. 552, 80 Stat. 383, as amended; 5 U.S.C. 552) [CGFR 68-82, 33 F.R. 18907, Dec. 18, 1968]

§ 162.014-2 General requirements.

(a) The manufacture and testing of water-side and fire-side fusible plugs intended for use in boilers installed on merchant vessels subject to inspection by the Coast Guard shall be in accordance with the requirements in this subpart.

§ 162.014-3 Types.

(a) Water-side plugs are fusible plugs which are inserted from the water-side of the boiler plate, flue or tube to which they are attached.

(b) Fire-side plugs are fusible plugs which are inserted from the fire-side of

(a) The casings of fusible plugs shall be machined to the dimensions not less than those shown in Figure 162.014-5, Sketch A for %-inch (i.p.s.) water-side plugs, Sketch B for 2-inch (i.p.s.) and larger water-side plugs, Sketch C for 2-inch (i.p.s.) and larger fire-side plugs, and Sketch D for 3-inch (i.p.s.) fire-side plugs. All dimensions are minimum. The minimum length of the fusible filling shall be increased at least 16-inch for each 64-inch increase of the minimum diameter for the fusible filling.