The OPI 350DG is a triplex drilling mud pump rated at 350 HP input power, an 8 in stroke and a rated speed of 175 SPM, with a maximum working pressure of 3525 PSI. Factory data lists maximum pressure by liner size, from 6 in liners at up to 1200 PSI down to 3.5 in liners at up to 3525 PSI. The power end frame is built from high-strength welded steel plate or cast steel for rigidity, the forged alloy steel crankshaft is precision-machined and dynamically balanced, and a V-gear drive with combined forced and splash lubrication keeps bearings and moving parts protected. We supply aftermarket fluid-end wear parts for this model, including Liner （缸套）, Piston （活塞）, Valve （阀）, Valve Seat （阀座）, Valve Spring （阀簧） and Packing （盘根）, shipped to Canada, the United States and international oil & gas markets under HS code 84139100.
FAQ
What are the factory ratings of the OPI 350DG?
Factory data rates the OPI 350DG at 350 HP input power, an 8 in stroke, a rated speed of 175 SPM and a maximum working pressure of 3525 PSI.
What pressures can the OPI 350DG reach with different liner sizes?
Per factory data at 175 SPM: 6 in liners up to 1200 PSI, 5.5 in up to 1428 PSI, 5 in up to 1730 PSI, 4.5 in up to 2135 PSI, 4 in up to 2705 PSI and 3.5 in up to 3525 PSI.
Are OPI 350DG fluid-end parts available?
Availability changes daily. Please contact us for current availability of Liner （缸套）, Piston （活塞）, Valve （阀） and Valve Seat （阀座） for this model.
Can you ship OPI 350DG parts to Canada or the United States?
Yes. We ship mud pump fluid-end parts to Canada, the United States and international destinations under HS code 84139100.
What is the construction of the OPI 350DG power end?
The frame uses high-strength welded steel plate or cast steel for rigidity, with a forged alloy steel crankshaft that is precision-machined and dynamically balanced, plus a V-gear transmission and combined forced and splash lubrication.