When I was working as operation Manager in 250 MW Karbala Power station, there was one issue that during cold weather, the PSRV pressure safety relief valve located at the down stream of the LDO forwarding pumps use to operate early the morning while unit (gas turbine frame 9e) was operating on partial Load. It was not closing normally therefore I advised operator to increase load by 10MW and this step was helping to close the PSRV. The Idea is that as soon as load is increased on gas turbine, the fuel flow towards turbine increases consequently pressure in the LDO pipe drops causes the PSRV to close.
As soon as the PSRV was closed, then operator use to reduce load gradually to its original load set and LDO system remains stable.
Disclaimer:
- OEM manuals and approved plant procedures take precedence.
- Only authorized personnel should perform the procedure.
- Site-specific risk assessment, permits and interlocks must be respected.
- The case study is not universal operating instruction.
Nawaz Ali Lakho is a power-generation professional and project-management consultant with more than 33 years of experience across thermal, nuclear, gas-turbine, steam-turbine, and combined-cycle power plants. His career encompasses plant operations, maintenance, commissioning, troubleshooting, asset management, and the leadership of multidisciplinary teams of more than 200 personnel.
His hands-on experience includes GE Frame 9E and 6FA and Alstom GT13DM gas turbines; Mitsubishi, GE, and Fuji steam turbines; heat-recovery steam generators; supercritical boilers; and major plant-control platforms from GE, ABB, Emerson, and Siemens. He has participated in cold and hot commissioning, major overhauls, hot-gas-path inspections, and combustion inspections at power facilities ranging from 150 MW to 586 MW.
At Global Power News, Nawaz shares field-informed O&M case studies, technical guidance, equipment insights, and analysis of power systems and energy infrastructure. Connect with him on LinkedIn.
International Experience: Have worked around the world specially, Pakistan, Iraq, Saudi Arabia, UAE, Angola, England and Nigeria.
Disclaimer: Articles are developed using internet research, professional field experience, and AI assistance. While every effort is made to ensure accuracy, the content may contain estimates, projections, or assumptions. The author assumes no liability for technical or computational discrepancies.