Page:1889 North Dakota Session Laws.pdf/122

 nace is at least two inches below the prescribed minimum water line of the boilers; that the arrangements for delivering the feed water are such that the boilers cannot be injured thereby, and that such boilers and their steam connections may be safely employed without peril to life. They shall also satisfy themselves that the safety valves are of suitable dimensions, sufficient in number and properly arranged, and that the safety valve weights and springs are properly adjusted so as to allow no greater pressure in the boilers than the amount prescribed by the inspection certificate; that there is a sufficient number of guage cocks properly inserted, suitable guages that will correctly record the pressure of steam; and that a fusible plug is properly inserted, so as to fuse by the heat of the furnace whenever the water in the boilers falls below its prescribed limits, and that adequate and certain provisions for an ample supply to feed the boilers at all times so that in high pressure boilers, the water shall not be less than four inches above the top of the flues, and that means for blowing out are provided so that the mud and sediment may be removed while the boiler is under pressure of steam. In subjecting to hydrostatic tests, boilers usually designated as high pressure, the inspector shall assume one hundred and twenty-five pounds to the square inch as the maximum pressure allowable as a working pressure for new boilers of forty-two inches in diameter, made in the best manner, of plates one-fourth of an inch thick, of good materials; but the inspector shall rate the working power of all high pressure boilers according to their strength, compared with this standard, and in all cases the test applied shall exceed the working power allowed, in the ratio of one hundred and sixty-five to one hundred and ten. In subjecting to the hydrostatic test boilers usually designated as low pressure, the inspector shall allow as a working power for each new boiler, a pressure of only three-fourths the number of pounds to the square inch to which it has been subjected by the hydrostatic test. Should the inspector be of the opinion that any boiler, by reason of its construction or material, will not safely allow so high a working pressure as herein provided, he may, for reasons to be stated specially in his certificate, fix the pressure of such boiler at less than three-fourths of the test pressure. No boiler or steam pipe nor any of the connections therewith, shall be approved which is made in whole or in part of bad material or is unsafe from any cause. Nothing herein shall be construed to prevent the use of any boiler or steam generator which may not be constructed of riveted iron or steel plates, when the Board of Inspectors have satisfactory evidence that such boiler or steam generator is equal in strength and as safe from explosion as boilers of the best quality constructed of riveted iron or steel plates.

§ 7. PENALTY FOR CONSTRUCTING IMPERFECT STEAM BOILER.] Every person who constructs a boiler or steam pipe of iron or steel plates, known to be faulty or imperfect, or who drills any rivet-hole