Rice Lake Z6 Single-Ended Beam, SS Welded-seal, IP67, OIML C3 - Manual (Page 43)

Attaching Piping to Weigh Vessels 39
When attaching pipes to a vessel partially
mounted on flexures, extra care must be
exercised to avoid side forces induced by
thermal expansion/contraction of the
pipes. Use flexible hose, bellows, or a
loop, and attach the pipes relative to the
load cells/flexures, as shown, to minimize
the transfer of weight from the flexures to
the cells or vice versa.
Do not attach pipes directly to the vessel
if possible (vented systems). Allow them
to enter through large clearance holes.
Flexible boots may be used to seal out
dust if necessary.
Do not run an attached pipe vertically to
its first support point. This will suspend
the vessel and destroy accuracy. All
pipes should be run horizontally away
from the vessel.
Increase as much as possible the
distance between the vessel and the first
pipe support.
Avoid long vertical runs of pipe,
particularly when they are restrained from
vertical movement. This is because any
thermally induced expansion/contraction
of the vertical pipe will be translated into
detrimental vertical forces on the vessel,
directly affecting accuracy.
Use flexible hose to make the
connection to the vessel. Do not use
the flexible hose to compensate for an
initial offset in the pipes.
Use flexible bellows to make the
connection to the vessel, if possible. Do
not use the bellows to compensate for
an initial offset in the pipes. Two bellows
may be used in series where large
deflections must be accommodated.
Incorrect Piping Guidelines Correct
Table 20-1. Piping Guidelines (Continued)
Load Cells
Flexures