09-08-2012, 12:00 PM
BOILER COMMISSIONING.
26550263-Boiler-Commissioning.ppt (Size: 163.5 KB / Downloads: 67)
OBJECTIVE:
It is a systematic procedure used after completion of erection in making the Boiler and its auxiliaries available for safe, smooth and reliable Operation.
Major events in Boiler Commissioning
01. Air leakage test.
02. Hydro testing of boiler.
03. Readiness of Boiler auxiliaries.
04. Gas distribution test.
05. Boiler light up
06. Alkali boil-out and first stage passivation.
07. Acid cleaning and second stage passivation.
08. Steam blowing of critical piping.
09. Safety valve floating.
10. Coal firing.
AIR LEAK TEST.
Air leak test is an erection activity and is conducted before conducting the Hydro test of boiler. The aim of air leak test is to ensure that erection of pressure parts is completed.
Air leak test is conducted by introducing air into the boiler pressure parts at a pressure of approximately 8 ksc and the entire boiler pressure parts are checked manually for any leakage.
BOILER HYDRO TEST.
Boiler hydro test is an erection activity and conducted after ensuring zero leakage from air leak test. Boiler hydro test is done at 1.5 times the design pressure of drum for the first time. It is statutory requirement and conducted every year. It is a major milestone activity in power plant installation schedule.
Boiler hydro test is done by filling water from the bottom most portion of the boiler. After ensuring full flow of water through the vents the vents are closed and pressurization is done by an external pump installed near the drain header.
READNESS OF BOILER AUXILARIES
After erection completion of individual equipments and their related systems, commissioning of each system and sub system are done individually to confirm the availability of each equipment.
ID Fans & Auxiliaries
PA Fans & Auxiliaries
SA Fans & Auxiliaries
Start-up burners and Bed Lances i.e Oil System
Blowers safety settings