(c) For offset bends, allowing a straight length between the bends is
better than making a direct reverse bend.
(3) Bending radius.
Figure 15 gives the radii for bending iron pipe of
various sizes.
Figure 15.
Radii for bending iron pipe.
7.
PIPE VISE.
a. Introduction. The pipe vise is a tool used to hold pipe firmly during
cutting, reaming, threading, and partial making-up operations. Only the hinged
vise will be discussed here. It has a fixed toothed lower jaw and a movable
toothed upper jaw.
b. Procedure for use.
(1) Release the pressure on the jaws of the vise (fig 16) by turning the
handle counterclockwise.
(2) Release the locking lever by pulling outward on it and then open the
vise by tilting the upper body to the side on its pivot.
(3) Lay the pipe in the vise on the V-shaped lower jaw. Support a long
length of pipe extending from the vise on a sawhorse or similar support.
(4) Reverse step (2) by tilting the upper body back to the closed position.
The lever automatically locks.
(5) Turn the handle clockwise until the V-shaped upper jaw presses on the
pipe. Turn the handle just far enough to get a good grip on the pipe. Avoid
turning it too hard and marking the pipe.
Note.
-
When working with polished or plated pipe, protect it from being
scratched by the steel jaws on the vise. A pipe coupling, split
lengthwise and lined with sheet lead, makes a good clamp to use in the
vise with such pipe.
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