. Tentative revised boiler safety orders. castings not over per cent Medium eastings not over per cent Heavy Castings not over per cent 97 Classification. In dividing castings into light, medium andheavy classes, the following standards have been adopted: 98 Castings having any section less than % in. thick shall beknown as liglit castings. 99 Castings in which no section is less than 2 in. thick shall beknown as heavy castings. 100 Medium castings are those not included in the above classifi-cation. new installations, part i, section i, potter boilers 27 Physical Properties and
. Tentative revised boiler safety orders. castings not over per cent Medium eastings not over per cent Heavy Castings not over per cent 97 Classification. In dividing castings into light, medium andheavy classes, the following standards have been adopted: 98 Castings having any section less than % in. thick shall beknown as liglit castings. 99 Castings in which no section is less than 2 in. thick shall beknown as heavy castings. 100 Medium castings are those not included in the above classifi-cation. new installations, part i, section i, potter boilers 27 Physical Properties and Tests 101 Transverse Test. The minimiTm breaking strength of theArbitration Bar under transverse load shall be not under: Light castings 2500 lbs. Medium castings 2900 lbs. Heavy castings 3300 lbs. In no case shall the deflection be under in. 103 Tensile Test. Where specified, this shall not run less than: Light eastings 18,000 lb. per sq. in. Medium castings 21,000 lb. per sq. in. Heavy castings 24,000 lb. per sq. in. Sfot. Thread. Pig. 5 Standard Fcrm of Test Specimen Required for Tension Tests op Gray-Iron Casting Material 103 Arhitratiofi Bar. The quality of the iron going into castingsunder specification shall be determined by means of the ArbitrationBar. This is a bar 1^ in. in diameter and 15 in. long. It shall beprepared as stated further on and tested transversely. The tensiletest is not recommended, but in case it is called for, the bar as shownin Fig. 5, and turned up from any of the broken pieces of the trans-verse test shall be used. The expense of the tensile test shall fall onthe purchaser. 104: Number of Test Bars. Two sets of two bars shall be castfrom each lieat, one set from the first and the other set from the lastiron going into the castings. Where the heat exceeds twenty tons, anadditional set of two bars shall be cast for each twenty tons or fractionthereof above this amount. In case of a change of mixture duringthe heat, one set of two bars shall a
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