Application
Device to compensate changes in pipe length
from both side, caused by temperature
changes. It cannot be used to absorb axial
forces, bending moments and twisting
moments in pipeline.
For service pressures and temperatures:
Technical description
The self lubricating expansion joint cosists of
a body, guide basket and piston. Piston has
two guiding rings, one in body guide, second
in guide basket. This secures that functional
part of the piston is not in contact with other
part of expansion joint during stroke (except
for gland packing) therefore this part of piston
and gland packing can not be mechanically
damaged. Rubber packing (or packing cord),
thrust ring, guide ring and stuffing box flange
are in gland packing space of the body. Gland
expansion joint double-sided consists of two
expansion joints single-ended in one body.
Self lubrication is provided by a differential
grease gun. Without the gun the expansion
joint must not be operating.
Connecting and face-to-face dimensions
Butt-weld end dimensions are given in the
table below.
Material
Body cast steel
Welded body end carbon steel
Piston carbon steel
Guide basket grey cast iron
Functional piston surface
anticorrosive finish
Testing
Strength and impermeability of the joint is
tested as per DIN 3230-3, ČSN 13 3060, part
two.
Installation
Axial forces of pipeline must be fixed outside
the expansion joint. Pipeline during
compensation must travel horizontally in
accordance with axis of the expansion joint.
Installation must not allow piston to stick in
its guide. For the purpose of easy installation,
expansion joints from DN 400 and up are
modified for optical alignment of the
expansion joint axis.
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