I get many queries reg startup procedure from my juniors from I&C dept. So i thought of putting it on my blog. This is an example of synthesis gas compressor which i had found surfing thru google and i had used it to make up my answers. Hope it will help you guys.
Startup procedure for the synthesis gas and refrigeration compressors goes on as follows:
Slowly open the two‑inch pressuring bypass across the outlet isolation valve. Admit synthesis gas to the compressor, pressuring the system to approximately XX psig. Depressure system by venting at low and high points. Continue to do this until the nitrogen atmosphere of the system has been diluted with synthesis gas and is close to the normal H2 / N2 content. When purging is complete, pressure the compressor system by opening the bypass valve. It is necessary to restrict the suction pressure in order for seal buffer gas be able to be put to the seal until the machine discharge pressure is great enough to get in.
This start‑up sequence assumes that all instrumentation has been commissioned and is ready for service, that all electrical power is available, electrical switches are in the OFF position and that all other valves are closed unless specifically noted otherwise.
This start‑up sequence assumes that all instrumentation has been commissioned and is ready for service, that all electrical power is available, electrical switches are in the OFF position and that all other valves are closed unless specifically noted otherwise.
Check for the following during startup--·
the surface condenser is already in service·
open the lubricating oil isolation valve from the lubricating oil skid to the compressor train· open the turbine casing drain isolation valve to compressor·
Place the gland condenser in service.
Open cooling water to the gland condenser.
Be sure that the loop seal in the condenser drain is full of water.
Open the steam to the gland condenser jet and close the warm up drain.
Adjust the LP steam to the gland condenser jet to hold 20 inH2O vacuum on the line from the turbine seals. If necessary, this vacuum can be increased until all of the steam leakage past the outer seal rings on the turbine has stopped.
If the vacuum cycles up and down, open the vacuum stabilizer air inlet valve on the line from the turbine seals. "
For an excellent treatise on compressors i would rather urge you to refer http://www.easydeltav.com/controlinsights/compressorcontrolstudent/ . Its too good for an aspiring control engineer. Its written by Greg Mc Millan. He has made it an ebook an available for all for viewing.
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