[Code of Federal Regulations]
[Title 46, Volume 2]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR53.01-10]

[Page 137]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 53_HEATING BOILERS--Table of Contents
 
                   Subpart 53.01_General Requirements
 
Sec. 53.01-10  Service restrictions and exceptions (replaces HG-101).

    (a) General. The service restrictions and exceptions shall be as 
indicated in this section in lieu of the requirements in HG-101 of the 
ASME Code.
    (b) Service restrictions. (1) Boilers of wrought materials shall be 
restricted to a maximum of 103 kPa gage (15 psig) for steam and a 
maximum of 689 kPa (100 psig) or 121 [deg]C (250 [deg]F) for hot water. 
If operating conditions exceed these limits, design and fabrications 
shall be in accordance with part 52 of this subchapter.
    (2) Boilers of cast iron materials shall be restricted to a maximum 
of 103 kPa gage (15 psig) for steam and to a maximum of 206 kPa gage (30 
psig) or 121 [deg]C (250 [deg]F) for hot water.
    (c) Hot water supply boilers. (1) Electrically fired hot water 
supply boilers which have a capacity not greater than 454 liters (120 
gallons), a heat input not greater than 58.6 kilowatts (200,000 B.t.u. 
per hour), and are listed as approved under Underwriters' Laboratories 
Standard 174 or 1453 are exempted from the requirements of this part 
provided they are protected by a pressure relief device. This relief 
device need not comply with Sec. 53.05-2.
    (2) Oil fired hot water supply boilers shall not be exempted from 
the requirements of this part on the basis of size or heat input.
    (d) Exhaust gas type boilers shall be restricted to a working 
pressure equal to or less than 103 kPa gage (15 psig) and an operating 
temperature equal to or less than 454 [deg]C (850 [deg]F). The design 
temperature of parts exposed to the exhaust gas must be the maximum 
temperature that could normally be produced by the source of exhaust 
gas. This temperature shall be verified by testing or by the 
manufacturer of the engine or other equipment producing the exhaust.
    (e) Heating boilers whose operating conditions are within the 
service restrictions of Sec. 53.01-10(b)(1) may be constructed in 
accordance with section I of the ASME Code. In addition, these heating 
boilers must:
    (1) Be stamped with the appropriate ASME Code symbol in accordance 
with PG-104 through PG-113 of the ASME Code;
    (2) Meet the service restrictions of Sec. 53.01-10(b)(2) if made of 
cast iron;
    (3) Have safety valves which meet the requirements of Sec. 52.01-
120 of this subchapter;
    (4) If a hot water supply boiler, have a temperature relief valve or 
a pressure-temperature relief valve in accordance with Sec. 53.05-2(c);
    (5) If automatically controlled, meet the applicable requirements in 
part 63 of this subchapter; and
    (6) Meet the inspection and test requirements of Sec. 53.10-3.
    (f) Controls and miscellaneous accessories. Refer to part 63 of this 
subchapter for the requirements governing controls and miscellaneous 
accessories.

[CGFR 68-82, 33 FR 18826, Dec. 18, 1968, as amended by CGD 81-79, 50 FR 
9435, Mar. 8, 1985]