GB/T 32338-2015 in English

This standard applies to the design and manufacture of piston/plunger single-acting drilling pumps, and specifies the technical requirements for 8 pressure levels from 3.5MPa to 69MPa. Its innovation is reflected in:

• For the first time, the quantitative indicator of discharge pressure unevenness ≤5% is clearly defined
• The hardness standard of bimetallic cylinder liner (60-65HRC) is established
• The reliability assessment method is introduced (Appendix D)

Hydraulic end pressure bearing parts must meet the following requirements:

1. Low temperature impact energy KV8≥27J (-20℃)
2. Magnetic particle inspection of castings shall be carried out in accordance with GB/T 9444 Level 1
3. Hydrostatic test pressure = 1.5 times the maximum pump pressure

Typical application case: A 2200 pump cylinder uses ZG25CrMo, and no leakage is verified after 3 times of 10-minute pressure maintenance.

1. The design of gear transmission should meet the following requirements:

• Service factor 1.25
• Bending strength safety factor ≥ 2.0
• Contact spot length ≥ 60%

2. Quality control notes:

• Power end cleanliness ≤ 1500mg (200 mesh filtration)
• Noise control: ≤ 100dB(A) (＞1600 specifications)
• Factory test ≥ 4 hours (including 2 hours of 80% load)