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ROTALIGN 01.2000
Special case: parallel growth
Pumps, in particular, often present the special situation in which they
must be handled as stationary machines, yet exhibit thermal growth
of a pure parallel nature (i.e. both front and back feet rise by the
same amount as the machine warms up).
Practical examples of thermal growth entries
17 17
"Hot" (steady state operation) shaft line
The motor (right) is unaffected by thermal growth, but must be
positioned during "cold" alignment such that it compensates the
expected parallel offset due to thermal growth of the pump.
Contrary to the standard procedure described on the previous page,
the desired offset could also be attained in this special case by using
the thermal growth function and entering a negative expected
"growth" of -0.17 mm for both front and rear feet of the right
machine; i.e. the motor on the right "sinks" by 17/100 mm relative to
the pump on the left:
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