Metal Bellows Correctedn 7/11/00 6:41 PM Page 82
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INSTALLATION INSTRUCTIONS
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Senior Flexonics Pathway Expansion Joints are fully
inspected at the factory and are packaged to arrive at
the job site in good condition. Please, immediately
upon receipt at the job site, verify that there is no
freight damage; i.e., dents, broken hardware, loose
shipping bars, etc.
Because the bellows expansion joint is required to absorb
thermal and/or mechanical movements, the bellows
element must be constructed of a relatively thin gage
material. This requires special installation precautions.
The following steps should be taken prior to installation
of the expansion joint into the pipeline or duct.
1. The opening into which the expansion joint will 2. When a flow liner is installed in the expansion
be installed should be examined to verify that the joint, orient the expansion joint with FLOW
opening for which the expansion joint wa ARROW POINTING IN DIRECTION OF FLOW.
designed does not exceed the installation
3. Using lifting lugs, lift joint to desired location
tolerances designated by the designer and/or
and position into pipeline or ducting.
purchaser. If the opening exceeds the tolerance,
notify Senior flexonics pathway at once for a
4. Weld end expansion joints.
disposition.
(a) PRIOR TO WELDING, COVER THE BELLOWS
2. The attachment edges of the pipe or duct should
ELEMENT WITH A CHLORIDE FREE FIRE
be smooth, clean, and parallel to each other.
RETARDANT CLOTH. This is to prevent arc
strikes, weld splatter, etc. from damaging the
3. The area around the expansion joint should be
bellows element.
cleared of any sharp objects or protrusions. If not
removable, they should be noted so they can be
(b) Using the proper electrode, weld the
avoided.
expansion joint to adjacent piping.
DO NOT USE BELLOWS TO CORRECT FOR
4. Expansion joints provided with lifting lugs
MISALIGNMENT OF PIPING UNLESS THIS
should be lifted only by the designated lifting
HAS BEEN CONSIDERED IN THE DESIGN OF
lugs. SHIPPING BARS (PAINTED YELLOW) ARE
THE EXPANSION JOINT.
NOT DESIGNED TO BE LIFTING DEVICES.
NEVER USE A CHAIN OR ANY OTHER
5. Flanged end expansion joints.
HANDLING DEVICES DIRECTLY ON THE
(a) Orient expansion joint flanges so that the
BELLOWS ELEMENT OR BELLOWS COVER. For
bolt holes are aligned with the mating flanges.
expansion joints not provided with lifting lugs
DO NOT FORCE THE EXPANSION JOINT TO
(i.e., less than 500 lbs.), the best lifting method
MATCH THE BOLT HOLES OF THE MATING
should be evaluated at the time of installation.
FLANGE. This causes torsion on the bellows
5. The shipping bars are installed on an expansion
and will severely reduce the bellows capability
joint to maintain shipping length and give the
during operation and may cause premature
expansion joint stability during transit and
failure of the expansion joint. It is good
installation. DO NOT REMOVE THE SHIPPING
practice to leave one pipe flange loose until
BARS UNTIL THE INSTALLATION IS COMPLETE.
the expansion joint is installed or to purchase
an expansion joint with a flange that will
rotate.
Installation:
(b) Install gaskets and bolt to the required torque
The following precautions must be taken when
recommended by the flange manufacturer.
installing an expansion joint:
1. Remove any protective covering from the ends of
expansion joint. Plywood covers may have been
used to protect flanges or weld ends. Check
inside expansion joint for dessicant bags or any
other material.
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