What is the distance between the impeller of the field drilling rig and the pump casing?

0.8 to 1.0 mm. The distance between the impeller and the pump casing of the field drilling rig can be adjusted by changing the thickness of the rear gasket, which is 0.8 to1.0mm. The clearance on the back of the impeller is1~1.3mm. The clearance value H 1-H2 can be obtained by measuring the height from the pump shaft shoulder to the inner wall of the pump casing and the depth H2 of the water seal seat hole of the impeller.