. Boiler safety orders. -quirements specified, analyses of two additional tubes from the samelot shall be made, each of which shall conform to the requirementsspecified. III Physical Properties and Tests 167 Flange Test, a A test specimen not less than 4 in. in lengthshall have a flange turned over at right angles to«the body of the tube NEW INSTALLATIONS, PART I, SECTION I, TOWER BOILERS 41 This flange as measured from the tool and die block as without showing cracks or flawsoutside of the tube shall be % in. wide. b In making the flange test, the flarin^shown in Fig. 7, may be used. 168 Flat
. Boiler safety orders. -quirements specified, analyses of two additional tubes from the samelot shall be made, each of which shall conform to the requirementsspecified. III Physical Properties and Tests 167 Flange Test, a A test specimen not less than 4 in. in lengthshall have a flange turned over at right angles to«the body of the tube NEW INSTALLATIONS, PART I, SECTION I, TOWER BOILERS 41 This flange as measured from the tool and die block as without showing cracks or flawsoutside of the tube shall be % in. wide. b In making the flange test, the flarin^shown in Fig. 7, may be used. 168 Flattening Tests. A test specimen 3 in. in length shallstand hammering flat until the inside walls are brought parallel andseparated by a distance equal to three (3) times the wall thickness,without showing cracks or flaws. In the case lapwelded tubes, thetest shall be made with the weld at the point of maximum bend. < CO FLARING TOOLA = OS. Diam. of Tube less § B- - I c P^h Position after using Flaring Tool\ingFlatter. k--A -^^L/tiersDIE BLOCKA = Diam. of Tube + ^ Fig. 7 Details of Flaring Tool and Die Block Bequired for MakingFlange Tests of Boiler Tubes 169 Hydrostatic Tests. Tubes under 5 in. in diameter shall standan internal hydrostatic pressure of 1000 lb. per sq. in. and tubes 5 diameter or over, an internal hydrostatic pressure of 800 lb. per Lapwelded tubes shall be struck near both ends, while under pres-sure, with a two-pound hand hammer or the equivalent. 170 Test Specimens, a All test specimens shall be taken fromtubes before being cut to finished lengths and shall be smooth on theends and free from burrs, b All tests shall be made cold. 171 Number of Tests. One flange and one flattening test shallbe made from each of two tubes in each lot of 250 or less. Each tubeshall be subjected to the hydrostatic test. 172 Retests. If the result of the physical tests of only one tubefrom any lot do not conform to the requirements specified in Pars. 167and 1
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