ASME B16.42:2016 pdf free download

ASME B16.42:2016 pdf free download.Ductile lron PipeFlanges and Flanged Fittings Classes 150 and 300.
6.1 Castings
Ductile iron castings covered by this Standard shall conform to ASTM A395. The castings shall not be repaired by plugging, welding, brazing, or impregnation.
6.2 Bolting
Bolting listed in paras. 62.1 and 6.2.2 is recommended to be used in flanged joints covered by this Standard. Bolting of other material may be used if permitted by the applicable code or governmental regulation.
6.2.1 High-Strength Bolting. Bolting materials haing allowable stresses not less than those for ASTM A 193 Grade 87 m4w be used with any flanged joint at all listed temperatures. The strength of the nut shall be not less than that specified for ASTM A194 Grade 2H.
6.2.2 Low-Strength Bolting. Bolting materials with yield strength equivalent to ASTM A307 Grade B are considerend low strength, and may be used for flanged joints at temperatures not gRater than 205C (40(YF) and only with gaskets described in para. 7.8.
6.2.3 BoltIng to Cast Iron flanges. When Class 150 ductile mm flanges arc bolted to Class 125 cast iron flanges, or Class 300 ductile iron flanges are bolted to Class 250 cast iron flanges. it is that low- strength holtings he used within the limitations in para. 6.2.2. If high-strength bolting is used, it is recommended that the mating flanges he flat faced and that lull-faced gaskets (ASMI 816.5, Table B-I, Gasket Group Number Ia) extending to the O.D. of the flange be used.
7.1.4 Fittings With Bases. Dimensions of baes for base elbows and base tees are shown in Tables 5 and 6.
7.1.5 SpecIal-Degree Elbows. Special-degree elbows ranging from I deg to 45 deg, inclusive, shall have the same center-to-contact-surface dimensions as 45 deg elbows; those over 45 deg to (deg, inclusive, shall have the same center-to-contact-surface dimensions as ‘11) deg elbows. The angle designation of an elbow is its deflection from straight-line flow and is also the angle between the flange faces.
7.2 FacIngs
7.2.1 General. Class lO fittings and companion flanges are regularly furnished flat or with a 1.5 mm (O.( in.) raised face. Class 3(a) fltting, and companion flanges are furnished with a 1.5 mm (O.(Wl in.) raked face. The raked face is Induded in the minimum flange thickness dimensions, Q, as given in the tables.
7.2.2 Facings of Blind flanges. Blind hinges need not be faced in the center if, when this center part is raised, its diameter is at least 25.4 mm (1 in.) smaller than the inside diameter of the corresponding pressure cla%s fittings, as given in the tables When the center part is depressed, its diameter shall not be greater than the inside diameter of the corresponding pressure-class fittings, as given in the tables. Machining of the depressed center is not required.