112 LAWS GOVERNING MARINE INSPECTION 



the Coast Guard acts thereon: Provided further^ That such boilers, 

 steam generators, or pressure vessels may be constructed \\\i\\ seamless 

 shells or by means of any approved method of welding governed by 

 the rules and regulations prescribed by the Commandant of the Coast 

 Guard. 



Boilerplates 



46 U.S.C. 408 (R.S. 4430) 



All iron or steel plates, or other material used in the construction 

 of boilers or unfired pressure vessels for use on vessels subject to in- 

 spection shall be tested and inspected in such manner as shall be pre- 

 scribed by the Commandant of the Coast Guard, so as to enable the 

 Coast Guard to ascertain the tensile strength, homogenity, toughness, 

 and ability to withstand the effect of repeated heating and cooling; 

 and no plate or other material shall be used in the construction of 

 such boilers or pressure vessels which has not been tested, inspected, 

 and approved under the rules and regulations of the Commandant of 

 the Coast Guard: Provided, however, That small uniired pressure 

 vessels having diameters not exceeding thirty inches and subject to a 

 maximum allowable working pressure not exceeding one hundred 

 pounds per square inch shall be exempt from this requirement. 



The Commandant of the Coast Guard may detail Coast Guard offi- 

 cials to inspect iron or steel plates or other material at the mills where 

 the same are manufactured ; and if such plates or material are found 

 in accordance with the rules of the Commandant of the Coast Guard, 

 the Coast Guard official shall stamp the same with the initials of his 

 name and the official stamp of the Coast Guard, which stamp shall be 

 authorized by the Commandant; and material so stamped shall be 

 accepted by the Coast Guard officials of the various districts as being 

 in full compliance with the requirements of this section regarding the 

 test and inspection of such plates and material : Provided, That any 

 person, firm, or corporation who affixes any false, forged, fraudulent, 

 spurious, or counterfeit of the stamp herein authorized to be put on 

 by a Coast Guard official shall be deemed guilty of a felony and shall 

 be fined not less than $1,000 nor more than $5,000 and imprisoned not 

 less than two years nor more than five years. 



Thickness of boilerplate 



46 U.S.C. 412 (R.S. 4434) 



The maximum allowable thickness of shell plates and the details 

 of material, design, and construction of externally fired boilers shall 

 be determined by action of the Commandant of the Coast Guard. 



Stamping boilerplates 



46 U.S.C. 409 (R.S. 4431) 



Every plate of iron or steel, made for use in the construction of 

 boilers, unfired pressure vessels, or riveted steam pipe shall be dis- 

 tinctly and permanently stamped by the manufacturer thereof, and, 

 if practicable, in such places that the marks shall be left visible 

 when such plates are assembled, with the name of the manufacturer, 



