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Technical Drawing & Function
The ASME B16.11 bushing has male threads on the surface of outside diameter (O.D.) and female threads on the surface of inside diameter (I.D.). When used in piping connection, its O.D. screws into the larger-diameter pipe with female threads and its I.D. screws into the smaller-diameter pipe with male threads, thus, makes a reduction in line size like a reducer. ASME B16.11 bushings can be further classified into hex head bushing and flush bushing, of which hex head bushings are most commonly used. The bushings are available in sizes 1/8″ through 4″. They are not identified by class designation and may be used for pressure ratings up to Class 6000 designation.

The technical drawing of 3 types of ASME B16.11 plug: (I) square head plug; (II) hex head plug; (III) round head plug. A: minimum length; B: minimum height of square head; C: minimum width flats; D: minimum overall length of round head plug; E: nominal round head diameter; H: minimum height of hex head; F: nominal width flats of hex head.

The technical drawing of ASME B16.11 street elbow with one end MNPT and other end FNPT. H: outside diameter of band; B: minimum length of perfect thread; L2: effective length of external thread; L: minimum length of male thread; G2: minimum wall thickness; J: center-to-male end of street elbow; G1: minimum wall thickness; A: center-to-female end of street elbow.

Technical drawing of ASME B16.11 90° elbow with socket welding ends. A: center-to-bottom of socket; B: socket bore diameter; D: bore diameter of elbow; C: socket wall thickness; G: body wall thickness; J: socket depth.
The technical drawing of ASME B16.11 90° elbow with NPT threaded ends. A: center-to-end of threaded elbow; H: outside diameter of band; G: minimum wall thickness; B: minimum length of perfect length; L2: length of useful thread.

ASTM A213 Gr. TP316L seamless tubes can be further classified as TP316L boiler tubes, TP316L superheater tubes, and TP316L heat exchanger tubes, according to the service it is used for. The tubing is usually specified by outside diameter and minimum wall thickness, or average wall thickness. Sometimes the wall thicknesses are specified by Birmingham Wire Gauge (B.W.G) numbers.