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Hi guys,
Our plant has GT MS9001E by GE. Recently we tried starting the GT on distillate (gas = primary fuel; distillate = secondary fuel) but failed. The AA booster compressor was functioning but there was no pressure reading on the AA manifold pressure gauge. The indicator needle did not even move even a whisker. We suspected the check valve right after the AA booster compressor to be stucked.
But after we rectified it, it still failed to start on distillate. According to the GE manual, there should be about 12psig = 0.7 bar. Subsequently, we opened the venting valve which is normally close during normal operation, to check if there was suction or discharge of air. The motor was rotating CCW. Surprisingly, there wasn't any suction. The air was discharging through the venting valve. We swapped the cable terminal for the motor and tested again. There was suction.
We did not try starting on distillate since then. Will do if we get the opportunity. I double checked the manual. It is stated that the AA motor should be rotating CCW if view at the drive end. But the actual situation required us to change the rotation to CW. My only suspicion would be the impeller in the compressor is installed wrongly.
We discussed among us alternative ways to bypass the AA booster compressor. One of them is to tap an external air pressure. The only problem is that we do not know at what pressure should we regulate it to. I tried checking when was the last time we ran on distillate but to no avail. Coz we rarely or did not start up on distillate.
I wonder if you guys have experienced similar problems. Appreciate the feedback.
thank you.
Our plant has GT MS9001E by GE. Recently we tried starting the GT on distillate (gas = primary fuel; distillate = secondary fuel) but failed. The AA booster compressor was functioning but there was no pressure reading on the AA manifold pressure gauge. The indicator needle did not even move even a whisker. We suspected the check valve right after the AA booster compressor to be stucked.
But after we rectified it, it still failed to start on distillate. According to the GE manual, there should be about 12psig = 0.7 bar. Subsequently, we opened the venting valve which is normally close during normal operation, to check if there was suction or discharge of air. The motor was rotating CCW. Surprisingly, there wasn't any suction. The air was discharging through the venting valve. We swapped the cable terminal for the motor and tested again. There was suction.
We did not try starting on distillate since then. Will do if we get the opportunity. I double checked the manual. It is stated that the AA motor should be rotating CCW if view at the drive end. But the actual situation required us to change the rotation to CW. My only suspicion would be the impeller in the compressor is installed wrongly.
We discussed among us alternative ways to bypass the AA booster compressor. One of them is to tap an external air pressure. The only problem is that we do not know at what pressure should we regulate it to. I tried checking when was the last time we ran on distillate but to no avail. Coz we rarely or did not start up on distillate.
I wonder if you guys have experienced similar problems. Appreciate the feedback.
thank you.