GB/T 26507-2019 in English

Standard Revision and Technology Evolution

This standard replaces the 2011 version. The main technical upgrades include: expanding the rated discharge pressure range to 0.6-5.0MPa, increasing the upper limit of gas content to 85%, adding new material selection specifications for hydrogen sulfide environments, and improving the performance test system. It reflects the technical requirements of my country's oil and gas field development for the adaptability of twin-screw mixed delivery pumps to high gas content conditions.

Core parameter system

Key technical requirements

4.5 Basic parameter specifications

The flow range covers 2.5-1000m³/h, and the pressure classification reaches 7 levels. Under special working conditions, the oil-gas mixed transmission pump is allowed to operate under the conditions of sand content ≤500g/m³ and medium viscosity 1×10⁻⁶~1×10⁻¹m²/s.

4.11 Efficiency grading system

Establish a five-level efficiency evaluation standard with gas content of 20%-100%. For example, under a pressure difference of 1.6MPa:

• Pure liquid state (gas content 0%): efficiency ≥65%
• High gas content state (85%): efficiency ≥50%
• Pure gas state (100%): efficiency ≥10%

Test method innovation

5.3.2 Performance test grouping

Adopt a two-group test method:

New Appendix D requires recording of gas/liquid phase flow data to provide basic data for multiphase flow research.

Material and safety specifications

Article 4.22 specifies that hydrogen sulfide-containing media should use sulfur-resistant materials that comply with GB/T 20972.2 to prevent stress corrosion cracking. Supporting requirements:

• The explosion-proof grade of the motor in explosive environment complies with GB3836.1
• Bearing temperature monitoring ≤80℃
• Noise control: ≤85dB(A)@37kW

Implementation suggestions

Key points for selection and application

1. Select a model that matches the efficiency curve according to the actual gas content
2. Sulfur-containing working conditions should give priority to using 316L and other sulfur-resistant material pump bodies
3. For large flow conditions (>400m³/h), pay attention to the attenuation of the upper pressure limit

Maintenance specifications

It is recommended to perform the following every 2000 hours:

• Rotor clearance detection (standard value 0.10-0.15mm)
• Overflow valve sealing test (1.1-1.3 times rated pressure)
• Retest volumetric efficiency (a 5% drop requires maintenance)