. Boiler safety orders. t 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 on;the purchaser. 104 Number of Test Bars. Two sets of two bars shall be castfrom each heat, 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 also be
. Boiler safety orders. t 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 on;the purchaser. 104 Number of Test Bars. Two sets of two bars shall be castfrom each heat, 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 also be cast for every mixture other 28 REPORT OF BOILER CODE COMMITTEE, than the regular one. Each set of two bars is to go into a single bars shall not be rumbled or otherwise treated, being simplybrushed off before testing. 105 Method of Testing. The transverse test shall be made on allthe bars cast, with supports 12 in. apart, load applied at the middle, Pipe Cope PATTERN 4- \ . 1 Fig. 6 Details of Pattern and Mold Required for Arbitration Bars inTesting Gray-Iron Casting Material and the deflection at rupture noted. One bar of every two of each setmade must fulfill the requirements to permit acceptance of the cast-ings represented. 106 Mold for Test Bar. The mold for the bars is shown in The bottom of the bar is 1/16 in. smaller in diameter than thetop, to allow for draft and for the strain of pouring. The patternshall not be rapped before withdrawing. The flask is to be rammed up NEW INSTALLATIONS, PART I, SECTION I. POWER BOILERS 2d with green molding sand, a little damper than usual, well mixed andput through a Xo. 8 sieve, with a mixture of one to twelve bituminousfacing. The mold shall be rammed evenly and fairly hard, thoroughlydried and not cast until it is cold. The test bar shall not be removedfrom the mold until cold enough to be handled. 107 Speed of Testing. The rate of application of the load shallbe from 20 to 40 seconds for a deflection
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