Bypass of Compressor Bypass of Compressor Darshit9 (Mechanical) (OP) 2 Apr 15 06:26 hii.. How Bypass line used for startup the multistage reciprocating Gas compressor? ,if no unloader & bypass line is provided than what will be a breakaway torque of reciprocating compressor?... RE: Bypass of Compressor LittleInch (Petroleum) 11 May 15 09:10 darshit9 - Please provide a sketch and some more info. "Breakaway"?? This is usually reserved for valve action. Remember - More details = better answers Also: If you get a response it's polite to respond to it. RE: Bypass of Compressor georgeverghese (Chemical) 12 May 15 01:15 If there is no unloader and the overall bypass line is fully open, then final discharge pressure on the compressor will be nearly the same as suction, and startup torque will be the same as if all unloaders are open ?