INSPECTION OF VESSELS 111 



SUBCHAPTER 3C.— MARINE ENGINEERING REQUIREMENTS 



Regulatory powers of Commandant of the Coast Guard as to 

 boilers, etc. 



46 U.S.C. 411 (R.S. 4433) 



The Commandant of the Coast Guard is empowered to prescribe 

 formulas, rules, and regulations for the design, material, and con- 

 struction of boilers, unfired pressure vessels, and appurtenances there- 

 of, and steam piping for use on vessels subject to the provisions of 

 this Act. The maxnnum working pressure shall be determined by 

 formulas prescribed by the Commandant of the Coast Guard and no 

 such boiler, pressure vessel, or appurtenance thereof shall be designed 

 or operated where the factor of safety is less than four: Provided^ 

 That the minimum thickness and maxmium allowable working f)res- 

 sure of valves, fittings, and other appurtenances shall be determined 

 by formulas prescribed by the Commandant of the Coast Guard. 

 {Jwne 13, 1933.) 



Construction of boilers and unfired pressure vessels 



46 U.S.C. 406 (R.S. 4428) 



All boilers and unfired pressure vessels constructed of iron or steel 

 plates or other approved metals for use on vessels subject to inspec- 

 tion shall be made of material that has been tested, inspected, and 

 stamped in accordance with the requirements of this Act. 



Punishment for improper construction 



46 U.S.C. 407 (R.S. 4429) 



Any person, firm, or corporation who constructs a boiler, or steam 

 pipe connecting the boilers, or an unfired pressure vessel for use on 

 vessels subject to inspection, of iron or steel plates or other approved 

 metals which have not been duly tested, inspected, and stamped ac- 

 cording to the provisions of this Act and the requirements of the Com- 

 mandant of the Coast Guard; or who knowingly uses any defective 

 material in the construction of such boiler, steam pipe, or pressure 

 vessel ; or who drifts any rivet hole to make it come fair ; or who de- 

 livers any such boiler, steam pipe, or pressure vessel for use, knowing 

 it to be defective in design, material, or construction, shall be fined 

 $1,000. Nothing in this Act shall be so construed as to prevent from 

 being used on such vessels any boiler, steam generator, steam pipe, or 

 unfired pressure vessel which may not be constructed of riveted iron 

 or steel plates: Provided, That scientific data and facts are submitted 

 to enable the Commandant of the Coast Guard to satisfy himself that 

 such boiler, steam generator, or pressure vessel is equal in strength 

 and as safe from explosion as one of the best quality of iron or steel 

 plates of riveted construction: Provided, however, That the Com- 

 mandant of the Coast Guard may grant permission to use any boiler, 

 steam generator, or unfired pressure vessel not of iron or steel plate 

 riveted construction upon the certificate of the Coast Guard official 

 for the district wherein such boiler, steam generator, or pressure ves- 

 sel is to be used, and other satisfactory proof that the use of the same 

 is safe and efficient, said permit to be valid until the Commandant of 



