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water leg and at least 2 handholes or (d) A stop valve shall be used in each washout plugs near the line of the lower supply and return pipe connection if tube sheet.
more than one boiler is connected to a (d) A fire door or other access opening common system. not less than 11 by 15 inches or 10 by 16 (e) Provision shall be made for cleaninches or 15 inches in diameter shall be ing the interior of the return piping at provided for the furnace of an internally or close to the boiler. fired boiler in which the least furnace (f) When stop valves are used they dimension is 28 inches or over.
shall be properly designated on tags of (e) Washout plugs shall be made of metal or other durable material as indi. nonferrous material and be of not less cated by the following: than 2 inches pipe size.
(f) Washout openings may be used for return pipe connections and the wash
Supply valve Number ( ). Do not
close without also closing return out plug placed in a tee so that the plug
valve-Number ( ). is directly opposite and as close as possible to the opening in the boiler.
(g) All threaded openings shall be tapped into material having a minimum thickness as specified for the various pipe Return valve-Number ( ). Do not sizes in table 53.03–50 (g).
close without also closing supply
valve-Number ( ). TABLE 63.03-50 (g)-MINIMUM THICKNESS OF MATERIAL FOR THREADED CONNECTIONS
(g) After installation the boiler shall Minimum
be hydrostatically tested to twice the thickness of
material or pressure at which the safety or relief Pipe size (inches)
valve is set to open. thread required (CGFR 48–23, 13 F. R. 3525, June 26, 1948) (inch)
$ 53.03-60 Safety valves. (a) Each I and under ..
steam heating boiler shall have one or 1/4 to 2, inclusive
more approved safety valves set to dis24
charge at a pressure of not to exceed 30 3 to 34, inclusive
p. s. i., and designed, constructed and
flow-tested for actual capacity in con(h) Flanged pipe connections to boil- formance with Subpart 162.012 of Subers shall conform to the standards given chapter Q (Specifications) of this in table 55.07–15 (5) of Part 55 of this chapter. subchapter for the corresponding pipe (b) The minimum safety valve casizes.
pacity in pounds per hour shall be (CGFR 48-23, 13 F. R. 3525, June 26, 1948, determined by dividing the maximum as amended by CGFR 49-18, 14 F. R. 5086,
B. t. u. output at the boiler nozzle obAug. 17, 1949)
tained by the firing of any fuel, for which $ 53.03–55 Installation. (a) Feed or the unit is designed, by 1,000 or by mulmake-up water shall not be discharged
tiplying the square feet of heating surdirectly into any part of a boiler exposed
face by 5. In many cases a greater to the radiant heat of the fire. Feed
relieving capacity of valves will have to water shall not be introduced through
be provided than the minimum specified the openings or connections used for the
by these regulations. In all cases the water column, the water gauge, or the
requirements of paragraph (c) of this
section shall be met. gauge cocks.
(c) The steam safety valve capacity (b) Hot water systems shall be so
for each boiler shall be such that with installed that there will be no opportu- the fuel-burning equipment installed. nity for the fluid-relief column to be
the pressure cannot rise more than 6 peraccidentally shut off.
cent above the maximum allowable pres(c) When a stop valve is used in the sure of the boiler. For set pressures not supply pipe connection of a single boiler, exceeding 15 p. s. i., the safety valve ca. there shall be one used in the return pacity may be such that with the fuelpipe connection.
burning equipment installed, the pressure cannot rise more than 5 pounds above shall be used. When two or more valves the maximum allowable pressure.
are used on a boiler, they may be single, (d) When operating conditions are directly attached, or mounted on a Y changed, or additional boiler heating
base. surface is installed, the safety valve ca- (d) No shut-off of any description pacity shall be increased, if necessary, shall be placed between the safety or to meet the new conditions and be in relief valve and the boiler, nor on disaccordance with paragraph (c) of this charge pipes between such valves and section. The additional safety valves the atmosphere. may be installed on the outlet piping
(e) The escape from safety or relief provided there is no intervening valve.
valves shall be fitted with discharge pip(CGFR 52-43, 17 F. R. 9347, Oct. 18, 1952] ing so arranged that there is no danger § 53.03-62 Relief valves. (a) Each
of scalding operating personnel. hot-water heating or hot-water supply (f) The area of the discharge pipe boiler shall have one or more approved shall be not less than the area of the relief valves set to relieve at a pressure valve or aggregate area based on the not to exceed 30 p. s. i., and designed, nominal diameters of the valves with constructed and flow-tested for actual which it connects. The discharge pipe capacity in conformance with Subpart shall be fitted with an open drain to pre162.013 of Subchapter Q (Specifications)
vent water from lodging in the upper of this chapter.
part of the valve or in the pipe. When (b) The steam relieving capacity in
an elbow is placed on a safety- or reliefpounds per hour shall be determined by
valve discharge pipe, it shall be located dividing the maximum B. t. u. output
close to the valve outlet. at the boiler nozzle obtained by the (CGFR 52–9, 17 F. R. 7651, Aug. 21, 1952) firing of any fuel, for which the unit is $ 53.03–70 Fittings and appliancesdesigned, by 1,000 or by multiplying the (a) Steam gauges.
(1) Each steam square feet of heating surface by 5. In
boiler shall have a steam gauge conmany cases a greater relieving capacity nected to its steam space, or to its water of valves will have to be provided than
column, or to its steam connection by that minimum specified by the regula
means of a siphon or equivalent device tions in this subpart. In every case, the exterior to the boiler and of sufficient requirements of paragraph (c) of this capacity to keep the gauge tube filled section shall be met.
with water and so arranged that the (c) The relief valve capacity for each gauge cannot be shut off from the boiler boiler shall be such that with any fuel except by a cock, with T or lever hanburning equipment installed the pres- dle, placed in the pipe near the gauge. sure cannot rise more than 3 pounds per The handle of the cock shall be parallel square inch above the maximum allow- to the pipe on which it is located when able pressure of the boiler.
the cock is open. (CGFR 52–43, 17 F. R. 9348, Oct. 18, 1952) (2) Connections to steam gauge si$ 53.03–63 Installation of safety and
phon shall be of nonferrous metal when relief valves. (a) Safety and relief
smaller than 1 inch pipe and longer than valves shall be installed with the spindle
5 feet between the siphon and point of vertical, if possible, and may be con
connection of pipe to boiler, and also nected directly to the boiler, or to a
when smaller than 1/2 inch pipe size and fitting connected to the boiler by a close
shorter than 5 feet between the siphon nipple, or to a Y base or valveless steam
and point of connection of pipe to boiler. or water pipe between adjacent boilers,
(3) The scale on the dial of the gauge or to a valveless header connecting steam shall be graduated to not less than 30 or water outlets in the same boiler. p. s. i. The gauge shall be provided with Safety and relief valves shall not be con
effective stops for indicating pointer at nected to an internal pipe in the boiler.
the zero point. The travel of the pointer (b) When a Y base is used the inlet
from zero to 30 p. s. i. shall be at least area shall be not less than the combined
3 inches. outlet areas.
(b) Water pressure gauges. (1) Each (c) When the size of the boiler re
hot water boiler shall have a pressure quires a safety or relief valve larger than gauge connected to it or to its flow con4 inches in diameter, two or more valves nection in such a manner, that it canhaving the required combined capacity not be shut off from the boiler except
by a cock, with T or lever handle, placed on the pipe near the gauge. The handle of the cock shall be parallel to the pipe on which it is located when the cock is open.
(2) Pressure gauge connections shall be of nonferrous material when smaller than 1 inch pipe size and longer than 5 feet between gauge and point of connection of pipe to boiler, and also when smaller than 12 inch pipe size and shorter than 5 feet between gauge and point of connection of pipe to boiler.
(c) Thermometers. (1) Each hotwater boiler shall have a thermometer so located and connected that the temperature may be read at the same time as the water pressure is being observed.
(2) The thermometer shall be so located that it shall at all times indicate the temperature in degrees Fahrenheit of the water in the boiler or near the outlet.
(d) Temperature combustion regulator. A temperature combustion regulator, which will control the rate of combustion to prevent the temperature of the water from rising above 250° F. at or near the outlet, or a thermostatic device which will relieve the pressure on the boiler when the temperature exceeds 250° F. shall be installed on each hot water heating boiler.
(e) Pressure control regulator. When a pressure control regulator is used, it shall cperate and prevent the steam pressure from rising above 30 p. s. i.
(f) Bottom blowof. Each boiler shall have a blowoff pipe connection fitted with a valve or cock of not less than 34 inch pipe size connected to the lowest water space available.
(g) Water gauge glasses. Each steam boiler shall have one or more water gauge glasses attached to the water column or boiler by means of valved fittings with the lower fitting provided with a valve or pet cock.
(h) Gauge cocks. Each steam boiler shall have two or more gauge cocks located within the visible range of the water glass.
(1) Water column pipes. The minimum size of pipes connecting a water column to a steam boiler shall be 1 inch. No connections, except for regulator, drain or steam gauge, shall be attached to a water column or the piping connecting a water column to a boiler. If the water column or gauge glass is connected
to the boiler by pipe and fittings, a T, or equivalent fitting, in which a drain valve and piping may be attached, shall be installed in the water piping connection at every right angle turn to facili. tate cleaning.
(j) Automatic low-water fuel cut-of. (1) Each automatically-fired steam boiler shall be equipped with an auto. matic low-water fuel cut-off, so located as to automatically cut off the fuel supply when the surface of the water fails below the lowest safe water level. If a water-feeding device is installed in conjunction with the required low-water fuel cut off, it shall be so constructed that the water inlet valve cannot feed water into the boiler through the float chamber and so located as to supply the required amount of feed-water when the surface of the water falls to the lowest safe water level. This point shall be not lower than the lowest visible part of the water glass.
(2) The fuel or feed-water control device may be attached direct to the boiler or to the tapped openings provided for attaching a water glass direct to a boiler, provided that such connections from the boiler are non-ferrous T's or Y's not less than 12-inch pipe size between the boiler and the water glass, so that the water glass is attached direct and as close as possible to the boiler. The straightway tapping of the Y or T shall take the water glass fitting, and the side outlet of the Y or T shall take the fuel cut-off or water-feeding device.
(3) Low water cut-off devices employing a float and float bowl shall have a vertical straight-a-way valved drain pipe at the lowest point in the water equalizing pipe connection by which the bowl and equalizing pipe can be flushed and the device tested. (CGFR 52-9, 17 F. R. 7651, Aug. 21, 1952)
$ 53.03–75 Hydrostatic tests, inspection, and stamping. (a) Each boiler shall be subject to a hydrostatic test pressure of not less than 60 pounds per square inch by the manufacturer.
(b) In the event of any defects developing, the defective material may be replaced and the boiler retested.
(c) Individual shop inspection of heat. ing boilers by an inspector is not required. Such inspection shall be made by the manufacturer while the boiler is subjected to the required hydrostatic test
34 and under. i to 242, inclusive. 3 to 342, inclusive.
516 210 58
(Coast Guard Approval No.) (CGFR 52-9, 17 F. R. 7651, Aug. 21, 1952] SUBPART 53.05_CAST-IRON HEATING BOILERS
SOURCE: $6 53.05–1 to 53.05-50 contained in CGFR 48-23, 13 F. R. 3526, June 26, 1948, except as otherwise noted.
$ 53.05–1 Scope. The regulations in this subpart contain detail requirements for the design and construction of castiron heating boilers.
$ 53.05-5 Manufacturer's certification. A manufacturer desiring to fabricate cast-iron heating boilers for use on vessels subject to inspection by the Coast Guard shall submit an affidavit on Form CG-935A certifying that such boilers will comply with all the applicable requirements of the regulations in this subchapter.
$ 53.05–10 Material. The material used in the fabrication of cast-iron heating boilers shall conform to the requirements of Subpart 51.61 of this subchapter for grade B or grade C cast iron. (CGFR 48-23, 13 F. R. 3526, June 26, 1948; CGFR 52-62, 17 F. R. 11875, Dec. 31, 1952]
$ 53.05-15 Washout openings. cast-iron steam and hot water heating boilers shall be provided with suitable washout openings to permit the removal of any sediment that may accumulate therein. Washout openings may be used for return pipe connections and the washout plug placed in a tee so that the plug is directly opposite and as close as possible to the opening in the boiler.
$ 53.05–20 Flanged connections. Flanged pipe connection openings in
$ 53.05–30 Hydrostatic tests, inspection, and stamping. (a) The completed boiler shall be subject to a hydrostatic test pressure of not less than 60 pounds per square inch by the manufacturer.
(b) In the event of any defects developing, the defective cored section may be replaced and the boiler retested.
(c) The requirements of $ 53.03–75 (c) and (d) apply to cast-iron heating boilers.
(d) (1) All cast-iron heating boilers shall be plainly and permanently marked, stamped, or cast with the following data:
(1) (Name of fabricator and serial number).
(ii) (Month and year fabricated).
(iii) (Maximum w. p.) (Steam or water). iv)
pounds per hour or B. t. u. per hour.
(Safety or relief valve capacity, minimum).
(v) Coast Guard Approval No.
(2) Items (i), (ii), and (iii) shall be stamped or cast on all cored sections of the boiler. In addition, a name plate containing all the markings listed herein shall be attached in a suitable location on the outside of the completed boiler or casing. (CGFR 48-23, 13 F. R. 3527, June 26, 1948, as amended by CGFR 52-9, 17 F. R. 7652, Aug. 21, 1952)
$ 53.05-35 Installation. The provisions of $ 53.03-55 shall apply to castiron boilers.
p. s. 1.
$ 53.05–40 Safety and relief valves. (a) The provisions of $ $ 53.03-60, 53.03– 62 and 53.03-63 shall apply to cast-iron heating boilers except as specified in this section.
(b) Safety and relief valves shall be set to discharge at a pressure not to exceed 15 pounds per square inch.
(c) Safety and relief valves for castiron heating boilers shall be such that with any fuel burning equipment installed, the pressure cannot rise above the maximum allowable pressure more than 5 pounds per square inch for a steam boiler and 3 pounds per square inch for a hot-water boiler. (CGFR 52-43, 17 F. R. 9348, Oct. 18, 1952)
$ 53.05-50 Fittings and appliances. The provisions of $ 53.03–70 shall apply to fittings and appliances for cast-iron boilers, except that the pressure control regulator shall operate to prevent the pressure from rising above 15 p. s. i. (CGFR 52-9, 17 F. R. 7652, Aug. 21, 1952]
Part 54-Unfired Pressure Vessels
Subpart 54.01-General Requirements Sec. 54.01-1 Scope. 54.01 5 Definitions. 64.01-10 Plan approval.
Subpart 54.03—Design and Construction 64.03-1 Materials. 54.03 5 Workmanship and design. 04.03 10 Cylindrical shells and heads. 84.03 12 Cast-iron heads. 64.03 16 Tube sheets. 64.03 20 Heat exchanger tubes. 04.03-26 Bolted flanged connections. 84 03 30 Evaporators. 84 03 38 Access and inspection openings. B4 03 40 Nozzle openings and reinforce
ments. Subpart 54.07-Pressure-Relief Devices 84 07 1 (eneral requirements. 1407 Relief valves, 84 07 10 Evaporator safety valves. 040115 Heat exchanger relief valves. 407 80 Rupture disks. ad 01 25 Bafety relief valves.
AUTHORITY: 11 54 01-1 to 54.07-25 issued linder 184403, AA Amended. 4462, as nendes 40 (8C375, 416. Interpret or y N
4400, 4417, 44174, 4418, 4426**** #414 41, a amended, sec. 14, 29 Stat.
305, secs, 1. 2. 49 Stat. 1644, BU **7. sec 6, 55 Stat 244, 245, as HALO 10 N (362, 363, 366, 367, 391,
40 41 435, 489, 1333. 50 U. 8. C. Tank 1040. 17 P. R. 9917; 3 CFR, la Buppe
SOURCE: $ $ 54.01-1 to 54.07–25 contained in CGFR 52-9, 17 F. R. 7652, Aug. 21, 1952; CGFR 52-62, 17 F. R. 11875, Dec. 31, 1952.
SUBPART 54.01–GENERAL REQUIREMENTS
$ 54.01-1 Scope. (a) The regulations in this part contain detail requirements for the design and construction of unfired pressure vessels subject to inspection by the Coast Guard.
(b) An unfired pressure vessel is subject to shop inspection when such a vessel may contain any of the following:
(1) Steam, gas, or vapors at pressures exceeding 15 pounds per square inch or temperatures exceeding 300°F. The shell, tubes, or coils of a heat exchanger shall be considered a pressure vessel if such parts may be subjected to steam. gas, or vapor pressures exceeding 15 pounds per square inch or temperatures exceeding 300° F.
(2) Fuel oil at pressures exceeding 100 pounds per square inch or temperatures exceeding 150° F.
(3) Lubricating oil at pressures exceeding 100 pounds per square inch or temperatures exceeding 200° F.
(4) Liquids, except fuel oil and lubricating oil, at pressures exceeding 100 pounds per square inch or temperatures exceeding 200° F.
(5) Liquids in compression tanks with air cushions of pressures exceeding 100 pounds per square inch.
(6) Stored or stowed dangerous articles, substances, or combustible liquids which are required by law or regulation to be carried in containers fabricated as a pressure vessel, irrespective of pres. sures, temperatures, or capacities, except such stored or stowed dangerous articles, substances, or combustible liquids which are permitted by Subchapter N (Explosives or Other Dangerous Articles or Substances and Combustible Liquids on Board Vessels) of this chapter to be carried in containers constructed in accordance with the requirements of the Interstate Commerce Commission.
(c) Unfired pressure vessels may be exempted from shop inspection when the internal volume does not exceed 5 cubic feet capacity and the design pres. sure does not exceed 100 pounds per square inch; however, such vessels shall otherwise comply with the requirements for materials, construction, welding and marking as specified in this subchapter.