**Ministry of Energy, People's Republic of China**
Approved: March 23, 1991
Implementation: August 1, 1991
**1. Scope and Field of Application**
This standard specifies the technical requirements, testing methods, inspection rules, marking, packaging, and storage for coal seam injection pumps (hereinafter referred to as water injection pumps).
It applies to axial drive swash plate plunger valves with reciprocating electric water pumps designed to transport water or liquids with physical properties similar to water.
It does not apply to crankshaft-driven reciprocating pumps.
**2. References**
- GB 7784: Test method for motor reciprocating pumps
- GB 10111: Random sampling method using random number dice
**3. Technical Requirements**
3.1 Water injection pumps must meet the requirements of this standard and be manufactured according to approved drawings and technical documents.
3.2 All self-made parts must pass tests before assembly. Purchased parts must have certificates or pass tests before being used.
3.3 Materials must be certified or tested before use.
3.4 The exposed surfaces of the product should be painted smoothly, with firm adhesion, consistent color, and no wrinkles, peeling, or bubbles.
3.5 After assembly, the pump should operate stably without abnormal sounds, vibrations, temperature rises, or leakage.
3.6 During operation, the temperature rise of the lubricating oil should not exceed 40°C.
3.7 During operation, the water seal leakage should not exceed 1.0 L/h, and other seals should show no external leakage.
3.8 During operation, the noise level should not exceed 85 dB(A).
3.9 The safety valve of the product must be sensitive and reliable.
3.10 Under rated conditions, the volumetric efficiency of the water injection pump must comply with the provisions in Table 1.
**Table 1**
| Project | <8 MPa | ≥8 ~ 16 MPa | Pump Speed (r/min) | 735 | 960 | 735 | 960 | Volumetric Efficiency (%) | ≥92 |
|--------|--------|-------------|---------------------|-----|-----|-----|-----|---------------------------|-----|
| | | | | | | | | | |
**Keywords:** Coal Seam Injection Pump, Technical Conditions
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