Regarding the issue of inlet pressure at the discharge end of the balance pipe in centrifugal compressors
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Today, in the document titled “Centrifugal Compressors for a Plant with an Annual Production Capacity of 300,000 tons of Synthetic Ammonia”, prepared by the former Dalian Institute of Technology, the description of the method for balancing axial thrust states that “according to API617, the balance tube should ensure that the pressure at the sealed discharge end of the balance disk does not exceed 0.035 MPa of the compressor’s inlet pressure”! However, after checking API617, I found no such provision! I’d like to ask if anyone has seen this regulation? Seeking answers:
Dalian Institute of Technology, now Dalian University of Technology – that API standard dates back to at least 1988
That’s because the process gas in the balance tube returns to the compressor’s inlet. If it exceeds a certain level, how can the process gas in the balance tube be discharged?
Can it be discharged if the pressure is lower than the inlet pressure?