More info
Description / Abstract:
This Practice describes the requirements for calculating
allowable piping loads and the application of those loads for
rotating machinery including pumps and compressors (centrifugal,
reciprocating and rotary screw), steam and gas turbines, and liquid
ring compressors. Also this Practice may be used on fans and
blowers after consultation with the manufacturer.
This Practice describes the requirements for allowable nozzle
loads for vital or sensitive machinery and for essential (spared)
machinery.
This Practice also outlines the requirements for minimizing
loads imposed on equipment by the piping systems.
Purpose
This Practice provides designers and engineers with requirements
that will reduce the Total Cost of Ownership (TCO) of rotating
machinery by determining allowable piping loads and piping load
applications.
Comment: Owner experience has shown that designing
machinery piping to the maximum published allowable loads results
in low mean time between repair (MTBR) and higher than acceptable
maintenance costs.
This Practice limits the application of the entire maximum
allowable nozzle load during the equipment installation design,
allowing some reserve margin to maximize the possibility of the
final installation actually remaining within the allowable
loading.
This Practice drives the stated, published and calculated
allowable nozzle loads to become more performance based, tied more
closely to actual effects on the MTBR and TCO for the machinery in
order to:
– Promote the highest reliability for vital or sensitive
machinery and the determination of those allowable loads that will
allow the achievement of that reliability
– Allow spared (essential) machinery to be more heavily loaded,
and encourage manufacturers to either furnish allowable load data
or be in accordance with a published standard
– Encourage machinery manufacturers to generate more meaningful
reliability-based allowable nozzle load recommendations
– Encourage standards organizations to look at the basis for
their allowable load values/calculation methods and verify the
effects on the demonstrated MTBR and Total Cost of Ownership
(TCO)