Page 237 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

Compressor Best Practices Best Practice 3 .25
Shop test checklist , Review all instrument calibration procedures
, Review test set-up drawing
1. Scope , Review data calculation (data reduction) methods
, Define work scopes for site personnel (assembly and
, Appropriate industry specs included (ANSI, API, NEMA, etc.) disassembly witness, video or still frame pictures, etc.)
, In-house and/or E&C specs included - Confirm assigned vendor service engineers will be in attendance
, Project specific requirements for:
, Performance test , All rotors , One rotor , Assembly
, Test (equivalent) conditions , Disassembly
, Field (actual) conditions , Test
, Mechanical test , All rotors , One rotor
Shop test activity
, Test (equivalent) conditions
, Field (actual) conditions , Review and understand test agenda prior to test
, Unit test of all equipment (string test) - Immediately prior to test meet with assigned test engineer to:
, No load , Includes auxiliary systems , Review schedule of events
, Full load , Does not include auxiliary systems , Designate a team leader
, Confirm test team leader will be notified prior to each event
, Use of job couplings and coupling guards
, Testing of instrumentation, control and protection devices , ‘Walk’ test set-up to identify each instrumented point
, Auxiliary system test , Confirm calibration of each test instrument
, Obtain documents for data reduction check e if applicable
, Lube oil , Test press , Full press (flow meter equations, gas data, etc.)
, Control oil , Test press , Full press
- During test (Note: coordinate with test personnel to avoid
, Seal oil , Test press , Full press interference)
, Seal gas , Test press , Full press
, Review ‘as measured’ raw data for consistency
, Fuel , Test press , Full press , ‘Walk’ equipment e look for leaks, contract instrument,
, Flow measurement required piping and baseplate vibration, etc.
, Time base recording of transient events required , Use test team effectively e assign a station to each individual
, Use of all special tools during test (rotor, removal, coupling, etc.) , Ask all questions now, not later, while an opportunity exists
, Shop test attendance (includes assembly and disassembly) to correct the problem
, Site reliability , Site , Site operations , Check vendor’s data reduction for rated point e if applicable
maintenance - After test
, Inspect all components as required by the test agenda
, Review of instruction book during shop test visit (bearings, seals, labyrinths, RTD wires, etc.)
, Test agenda requirements , Review data reduction of performance data corrected to
, Mutually agreed limits for each measured parameter guarantee conditions
, Issue for approval 2 months prior to contract test date , Review all mechanical test data
, Generate list of action (if applicable) prior to acceptance of
2. Pre-test meeting agenda test
- Meet with test department prior to test to: , Approve or reject
, Confirm test agenda requirements
, Confirm all test parameters have mutually agreed established
limits

Best
Best Practice 3.25Practice 3.25

Do not allow centrifugal compressor mechanical tests to Some of these issues have been:
be run under vacuum conditions Vibration due to insufficient axial gap between components caused
This is specified because this type of test does not expose the by thermal expansion of the rotor
components to the following field conditions: Thrust bearing high pad temperatures
Partial shaft torque Axial rotor to diaphragm rubs
Thermal expansion of rotor
Partial thrust load
Benchmarks
This best practice has been followed since the 1970s, and has resulted
Lessons Learned in trouble free start-ups and centrifugal compressor reliabilities of
Centrifugal compressors that have had mechanical tests run greater than 99.7%.
in a vacuum have encountered field problems that would
have been exposed under partial pressure mechanical tests.

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