Hydrocarbon Compression


without comments

After the compressor unit is selected and a purchase order issued and accepted, the next steps require continued vigilance. This is not simple be­cause many more people in the engineering and supplier organizations now become involved. Follow these guidelines to prevent certain items from being neglected:

1. For all but simple catalog units, prepare a process and instrumentation diagram or an engineering flow diagram for the complete compressor system.

2. Establish the layout requirements including those determined by operator assignment, that is, the number of operators assigned to the compressor during normal operations, during startup only, etc. Provide terminals for remote control if an operator will not be in attendance at all times.

3. If a large, complex compressor is involved, hold meetings with the supplier’s engineering group to establish schedules for the submission, review, and approval of the supplier’s engineering data and drawings, and tentative plans for use of his servicemen during installation and startup.

4. Review the compressor manufacturer’s drawings and those of his suppliers to ensure that quality and performance criteria are being met.

5. Review the torsional-vibration analysis and lateral critical studies completed by the compressor and drive supplier to make certain that no contemplated operating condition will cause the machine to operate at a hazardous speed.

6. Review unpriced supplier orders. (Priced orders would not be made available and are unnecessary.)

7. Review control plans, including startup, normal operation, scheduled and forced shutdowns, protective and safety devices for alarm and shutdown, and the duties to be assigned to the operators.

8. Submit to the supplier, for his comments and review, design bases and installation drawings for foundations, piping, and pipe supports. Such information should include the calculated forces and moments (hot and cold) exerted by the piping on the equipment flanges. Guidelines for allowable values are established by the compressor and turbine suppliers on their outline drawings.

9. Review requirements for shop and field pressure and performance testing. In most applications, test procedures established by the supplier are sufficient. Establish procedures for shop erection and match marking of the prefabricated pipe to be furnished by the compressor supplier. Establish what shop tests are to be witnessed.

10. Establish requirements for such items as operating and maintenance access (cranes, monorails, etc.); noise control within buildings and other enclosures; protection from fumes and dust; winterizing; and piping systems, including drains, vents, and access for field flushing and cleaning.

11. Provide methods so that the installed dimensional accuracy of piping right at the compressor is high, and thus compatible with the level of dimensional exactness required by the machinery. Neglect of this may require field changes in the piping arrangement to secure and maintain the acceptable compressor alignment. Arrange the major piping so that supports can be taken from concrete substructures rather than from elevated steel structures. This is most important in reciprocating compressors because it helps in attenuating vibration.

12. Make provisions for shop inspection during fabrication and assembly, as well as during shop testing.

13. Obtain copies of expediting and inspection reports. Monitor delivery schedule.

Written by Jack

October 1st, 2021 at 1:05 am

Posted in Fundamental

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