Mainly used in coal gasification process of TEXACO technology, SHELL technology, GSP technology, HT technology. HP-OHA can be chosen as lock hopper circulating pump, chilling water pump, particles water circulating pump and flushing tower circulating pump in TEXACO technology. HP-OHA also can be chosen as slag tank circulating pump and ash discharge auxiliary pump in the SHELL technology. The pumping fluid with 0.5% to 3% solid particles, with certain corrosively, with higher inlet pressure, with pulsation inlet pressure，with low NPSH，with high pressure, with high temperature also can use HP-OHA pump.