Page 22 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

Installation, Maintenance, and Repair of Horizontal Pumps 7
(sez Figure 1-5) is being used less and less. API vertical in-line pumps
will be discussed later.
APZ (American Petroleum Znsritufe) style pumps are designed for petro-
chemical services in accordance with API Standard 610. API standards
define minimum requirements for pumps in heavy duty hydrocarbon ser-
vice.
API pumps are generally specified in steel or noncorrosive materials
with 300 lb raised face (RF) flanges. The pump casings are available
with centerline supports rather than foot supports to reduce alignment
distortion at high temperatures. The pressure limitations are at approxi-
mately 700 PSI with a maximum temperature of 850°F. API pumps are
required to have closed impellers with case and impeller wear rings.
The base plate and motor requirements will be the same as the ANSI
pumps, although the procurement of sturdier baseplates is advisable.

Principles of Installation of Pumps and Drivers’
The correct installation of pumps and drivers is an often overlooked
requirement. Incorrect installation indirectly costs millions of dollars a
year in increased maintenance and lost production due to premature
equipment failure.
This segment of our text provides a set of guidelines that will result in a
good pump installation. While centered around a typical single-stage,
overhung, centrifugal pump, and a motor driver, it can easily be adapted
to all types of machinery-the principles are the same. And, while these
guidelines prescribe the minimum requirements to be performed by the
installing agency, any specific instructions provided by the equipment
manufacturer should also be observed. Conflicts should be resolved
prior to installation. Refer also to checklists in Appendix 1B.

Preinstallation and Equipment Preservation Measures
When a pump is shipped from the manufacturer to the field, it nor-
mally is “suitably prepared” for short duration storage up to approxi-
mately six months. It is very important that the integrity of the equipment
be maintained during the construction phase of the installation. Many
pieces of equipment have been ruined before they had a chance to oper-
ate, because of mishandling in the field prior to unit start-up.

~
* Source: J. W. Dufour, Amoco Oil Company. Chicago. IL.