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364. Pipe FittingThis is the term used to designate the work of
putting together various lengths of piping and their
connecting parts. This work is associated with the machine shop,
where the required lengths of piping
are usually cut and threaded. The connecting parts are known as
fittings. They are made in certain
standard forms as a branch of re-manufacturing, and are kept in
quantities among the supplies of themachine-shop store-room.
Fig. 21. - !"ample of #ipe Fitting.
The piping, used so e"tensively for conveying steam, water and
gas, in many requirements other than
those of engineering, is described in the chapter on
the re-manufacture of metals. The standardi$ationof the
si$es and threads of fittings to agree with standard si$es and
threads of piping makes it possible
to use together the fittings and piping of all manufacturers.
%owever, difficulty is occasionally found in
pipe-fitting work due to the fact that the slightly
tapered threads on both pipe and fittings are cut toodeep or too
shallow.
&eference 'o. Fitting-. (i$e. (tyle.
1 )lobe valve.............................. 1*2+
2 ngle valve............................. *+
)ate valve............................ 1*2+
#lug cock........................... *+
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/ %ori$ontal check valve............................. *+
0ertical check valve............................. *+
ngle check valve.................... 1+
screw union............................ *+
3 Flange union................................... 1+
14 5ong screw................................ 1+
11 ..............do.................................. *+
12 Tee........................................... *+ 6alleable,
beaded.
1 .....do.............................. *+ 6alleable, plain.
1 ..............do.................................. 1*2+
6alleable, beaded.
1/ 7ull-head tee.................................. *+"1+ 8o.
1 &educing tee................................*+"1+"1
+8o.
1 Four-way tee............................. *+ 6alleable,
plain.
1 9ross................................... *+ 6alleable,
beaded.
13 :-branch.................................. *+
9ast iron.
24 !lbow............................................. 1+
6alleable, plain.
21 .....do....................................... *+ 8o.
22 &educing elbow............................... *+"1+ 9ast
iron.
2 (ide-outlet elbow.............................. 1+ 6alleable,
plain.
2 (treet elbow................................... *+ 6alleable,
beaded.
2/ /o &eturn bend......................... *+ 8o.
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2 &eturn bend............................... 1+ 9ast
iron.
2 (leeve coupling........................ *+
2 &educing coupling............................... 1*2+"*+
6alleable, plain.
23 ..............do.................................. *+"1+
8o.
4 !"tension piece...................... 1*2+ 8o.
1 7ushing............................... 1*2+"*+
2 ..............do.................................. *+"+
!"pansion ;oint....................................
1*2+
9ross-over..................................... *+ 6alleable,
beaded.
/ (houlder nipple................................ 1+
5ong nipple........................ 1+
9ap.................................. 1*2+
..............do.................................. *+
3 .....do....................................... 1*2+
4 #lug........................................ *+
1 ..............do.................................. *+
2 .....do........................................ *+
#ipe threads are usually right handed, though left-hand threads
are used for special purposes. The pipe
ends are always threaded on the outside and most of the fittings
are threaded to screw on the pipe end,although some fittings are
made with outside threads to be screwed into other fittings.
