api standard for screw pumps

The primary API (American Petroleum Institute) standard for screw pumps is:

API 676 - Positive Displacement Pumps—Rotary

This standard covers rotary positive displacement pumps, including screw pumps, used in petroleum, petrochemical, and natural gas industries.

Key Features of API 676 for Screw Pumps:

1. Design & Construction

• Materials, pressure ratings, and dimensional requirements.

• Covers single-screw (progressive cavity) and twin/triple-screw pumps.

2. Performance Requirements

• Flow rates, pressure capabilities, and efficiency.

• Acceptable vibration and noise levels.

3. Testing & Inspection

• Hydrostatic tests, performance tests, and NDE (non-destructive examination).

• Factory acceptance testing (FAT) requirements.

4. Ancillary Equipment

• Sealing systems (mechanical seals, packing).

• Driver requirements (electric motors, turbines).

5. Operation & Maintenance

• Guidelines for installation, startup, and maintenance.

Other Relevant API Standards:

• API 682 (Shaft Sealing Systems for Pumps) – Applies to sealing in screw pumps.

• API 610 (Centrifugal Pumps) – While mainly for centrifugal pumps, some general requirements may overlap.

Industry Applications:

• Oil & gas production, refining, and pipeline services.

• Chemical processing and power generation.

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