Page 388 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer
P. 388

Lube, Seal and Control Oil System Best Practices  Be st Practice 7.5
              objectives, then, of this phase are to confirm the proper  During all functional testing, any system pulsations or pres-
              arrangement  details  and  functional  operation  of  the  sure drops above specified values are reason for the non-
              equipment.                                           acceptance of the test. All components which do not meet re-
                                                                   quirements must be corrected and units must be completely
              Test agenda                                          retested.
                                                                     The value of testing the auxiliary console with the unit
              To meet the objectives of this phase the equipment must be
                                                                   should be seriously considered. Since the console and the unit
              thoroughly tested prior to field installation. The test should  piping form the specific auxiliary system, there is a significant
              confirm the functional operation of all components as they will  benefit to testing both together. The additional costs of such
              operate in the field. In order to ensure a valid factory test, a test  a test should be evaluated against the potential reduction of
              agenda should be prepared approximately two months before  reliability and loss of operation time in the field if any
              the test date, and be reviewed by the equipment purchaser.  malfunctions exist that were not determined by test of the
              Specific areas of concern are:
                                                                   console alone.
                                                                     Testing the console without the unit assumes that a model of
              Flushing                                             the actual equivalent critical equipment orifices has been
              Component system flushing is required as an inspection point  properly installed during the test. There is no assurance that the
              and should be accepted prior to the initiation of the test. Ad-  actual manufacturer of the equipment has not incorporated
              ditionally, all test agendas should always be structured such
                                                                   changes in equivalent orifices sizes. This would result in differ-
              that a limit for each item to be tested is specifically defined in  ent flows to the unit and different console responses for various
              the test agenda. The flushing acceptance criteria must be mu-
                                                                   transient operational modes. Daily revenue should be consid-
              tually agreed upon and be adhered to during the review of  ered in evaluating the extra cost involved for a full console unit
              flushing the operation. A typical field flushing procedure is  test in a manufacturer’s works. If a full unit test is to be
              given in B.P. 7.18.
                                                                   performed, it is still recommended that the console be tested at
                                                                   the point of manufacture prior to the unit test in the critical
              Confirm arrangement details                           equipment vendors shop. This action will reveal console design
              Prior to commencement of test, it should be confirmed that the  problems prior to shipment to the vendor’s plant.
              arrangement of all components, controls and instruments agree
              with design requirements. Any discrepancies should be  I. System requirements e see chart (previous page) for
              corrected prior to functional test.                  input data
                Confirm proper test fluid in sufficient capacity is present to
              prior to the initiation of test.
                                                                    1. Total pump flow           ¼ ______   equipment
                                                                    (Positive displacement pump)  flow (l a )
              Temporary test setup                                  Total pump flow              ¼ ______
              If it is necessary to import utilities or switches for the test that  (Centrifugal pump)  ¼ ______ (total flow in l a )
              are not normally present, as in the case of steam turbine steam  2. Bypass flow    ¼ (1) e l a total flow
              generator and control switches, these items must be con-  (Positive displacement pump)  ¼ ______e_____
              firmed prior to test initiation. In addition, a means of                           ¼ ____________
              confirming proper flow rates, temperature and pressure during  3. Total heat load (from la)  ¼ ______ BTU/HR or kW
              the test must be provided. Supply lines to the unit must be
                                                                    4. Pump discharge pressure  ______60 _____1000
              provided with properly size orifices to duplicate unit flow
              requirements.                                           Viscosity (SSU) or centistokes  ________ ________
                                                                      A. Lube oil pressure     ________ ________
                                                                         (at equipment)        ________ ________
                                                                      B. Elevation DP          ________ ________
              Functional testing
                                                                      C. Pipe DP               ________ ________
              Having confirmed proper test setup, calibration of all in-  D. Valve DP           ________ ________
              strumentation, proper fluid and test instrumentation, the  E. Cooler DP           ________ ________
              functional test is now ready to be performed. As a minimum the  F. Filter (clean) DP  ________ ________
              following tests should be performed on any auxiliary system  G. Miscellaneous DP  ________ ________
                                                                                               Pressures in kPa or PSI
              console:                                                Pump discharge press
                                                                      (Add A through G)
              - Relief valve test (if supplied)
              - Transfer valve test                                 Note: If system is combined with seal and/or control oil, add highest
              - Auto start test of auxiliary pump with the following  value to determine pump discharge pressure.
                 conditions:
              - Main pump tripped                                  II. Component requirements
              - Two pump operation (main pump in operation, standby  Confirm sizing as stated below and check data sheet and specific
                 pump started)                                     requirements for each component.




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