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[
EJ GUIDE ]
Expansion Joint Design and Installation
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The expansion joint design shall
conform to the requirements of the EJMA Standards, the
ANSI Piping Codes and the ASME Boiler and Pressure
Vessel Codes as applicable. The design of structural
attachments shall be in accordance with accepted
methods, based on elastic theory.
Expansion joint manufacturing quality
The expansion joint manufacturer shall be required to
furnish, on request, a copy of their Quality Assurance
Manual.
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Installation
The necessary steps for installing all
expansion joints shall be pre-planned. The
installers shall be made aware of the steps as well as
the installation instructions furnished by the
manufacturer. The most critical phases of the
expansion joint installation are as follows:
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Care shall be exercised
to prevent any damage to the thin bellows section,
such as dents, scores, are strikes and weld spatter. |
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No movement of the
expansion joint - compression, extension, offset,
rotation and especially torsion - due to piping
misalignment, for example, shall be imposed which
has not been anticipated and designed into the
movement capability of the expansion joint. If
such movements are imposed, they can result in
system malfunction, damage to the bellows or other
components in the system. Specifically, cycle
life adjacent equipment may exceed their design
limits, internal sleeve clearances may be adversely
affected, and the pressure capacity and stability of
the bellows may be reduced. |
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Any field
pre-positioning shall be performed in accordance
with specific instructions which include both the
direction and magnitude of the movement. |
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Anchors, guides and
pipe supports shall be installed in strict
accordance with the piping system drawings.
Any field variances from planned installation may
affect proper functioning of the expansion joint and
must be brought to the attention of a competent
design authority for resolution. |
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The expansion joint, if
provided with internal sleeves, shall be installed
with the proper orientation with respect to flow
direction. |
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After the anchors or
other fixed points are in place and the piping is
properly supported and guided, the expansion joint
shipping devices should normally be removed in order
to allow the expansion joint to compensate for
changes in ambient temperature during the remainder
for the construction phase. |
EJ Guide |
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U.S. Bellows, Inc. Designed and Fabricated 50
Universal Expansion Joints for an Air Force Base in New Mexico
(Ref#91376-A1, EA) 11/14/2007
U.S. Bellows, Inc. fabricated 50 expansion joints from 304L
stainless steel. The expansion joints were 6" and 8" sizes. The 6"
expansion joints are 24" face to face and the 8" expansion joints
are 26" face to face. All of the expansion joints are fabricated
with liners that are also made with 304L stainless steel. The design
temperature was 200°F and the design pressure was 200 PSIG. The
expansion joints were dye-penetrant tested and hydro tested at 300
PSIG. U.S. Bellows, Inc. provides 100% customer satisfaction in
terms of quality and delivery.
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FAX: (713) 731-8640