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 M e c h a n i c a l Slip Joint
FIGURE 7-1.
( d ) A retaining flange to hold the gaskets and ball in the casing
I n construction, the pipe end of one of the two pipes being coupled is
c o n n e c t e d to the joint casing; the other pipe end is connected to the ball.
T h e ball is a hollow fitting that has two ends. One end is shaped externally
l i k e a b a l l , a n d f i t s i n s i d e t h e c a s i n g . T h e other end is cylindrical in
shape and can be threaded, flanged, or adapted for welding to the pipe.
B e c a u s e of the flexible articulation, ball joints can accommodate movements in
t w o or more planes simultaneously, as well as permitting twisting or torsional
rotation of the pipe, and angular movement.
4 INSPECTION AND MAINTENANCE OF EXPANSION LOOPS AND BENDS. N o specific
maintenance is required for expansion loops and bends other than inspection
f o r alignment. T h e following general inspection procedures are used for
ordinary piping:
( a ) Checking for leaks
(b) Inspecting supports
( c ) Making certain that operating conditions do not exceed temperature
a n d pressure ratings
5 INSPECTION AND MAINTENANCE OF EXPANSION JOINTS.
5 . 1 Inspection and Maintenance of Mechanical Slip Joints. Once a year,
i n s p e c t for signs of erosion, c o r r o s i o n , wear, deposits, and binding. Repair
7-8
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