ANSI/HI 11.6-2022
Rotodynamic Submersible Pumps for Mechanical and Electrical Acceptance Tests
- Standard No.
- ANSI/HI 11.6-2022
- Release Date
- 2022
- Published By
- American National Standards Institute （ANSI) US / ANSI
- Latest
- ANSI/HI 11.6-2022
- Introduction
Standard Overview and Technical Evolution Background
Submersible pumps are critical equipment used in special operating conditions. Their mechanical and electrical integrity is directly related to the safe operation and service life of the equipment. ANSI/HI 11.6-2022 is the Hydraulic Society's mechanical and electrical acceptance test specification specifically for submersible pumps, marking the professional development of the submersible pump testing standard system.
Compared to the previous version, the 2022 standard has undergone significant structural adjustments: hydraulic performance testing, hydrostatic pressure testing, and required NPSH testing have been moved to ANSI/HI 14.6, and vibration testing requirements have been moved to ANSI/HI 9.6.4. This specialized division of labor reflects the development of testing technology and the improvement of standardization.
Scope of application and test types of the standard
This standard applies to the mechanical and electrical integrity acceptance tests of all submersible pumps, covering a variety of equipment types:
Pump type Applicable situations Test focus Semi-permanent/lift type/wet well type Long-term underwater operation Sealing integrity, electrical insulation Dry well/dry installation type Dry installation environment Mechanical structure strength, electrical safety Portable/flexible export type Mobile usage scenarios Connection reliability, portability and safety Chopping/Cutting/Grinding Conveying solid materials Mechanical wear resistance, adaptability to special working conditions DC or battery-powered motor No AC power environment DC system compatibility, battery protection Fractional horsepower motor Small application scenarios Miniaturization design verification, economic testing Test type selection strategy
The standard defines three main test types, and users can choose according to project requirements and budget:
Test Type Witness Requirement Cost-Effectiveness Applicable Scenarios Non-Witnessed Factory Testing No Witness Lowest Cost Standard Products, Projects with Budget Constraints Certified Factory Testing No Witness but Certification Documents Medium Cost Standard Projects with Documentation Required Witnessed Factory Testing Witness Presence Required Highest Cost Critical Applications, Large Projects, Special Requirements Remote Witness Testing Witnessing via a remote system Medium cost Geographical restrictions, during epidemics
Mechanical Integrity Testing Technical Requirements
Casing Pressure Test
For submersible pumps with a submersion depth of 0-25 meters, the standard specifies a detailed casing pressure test procedure:
Safety Warning: The test pressure must not exceed 100 kPa (approximately 15 psi) to prevent equipment damage and safety incidents. The test configuration uses a pressure "T" assembly to connect to the casing. After pressurization, isolate the pressure source and observe the pressure gauge reading.
Acceptance Criteria: The pressure reading must remain stable for 5 minutes, with an allowable fluctuation range of ±5% of the stable value. In modern testing, calibrated leak decay instruments can be used instead of traditional pressure gauges to improve test accuracy.
Shell Vacuum Test
The vacuum test requires a minimum vacuum of 55 kPa (8 psi) and is achieved by simultaneously evacuating the shell chamber and a reference vessel. The test system includes a vacuum pump, a reference vessel, a valve, and a differential pressure transmitter.
The leak rate acceptance criteria are determined by the manufacturer based on the equipment specifications, reflecting the standard's respect for the manufacturer's professional judgment. This flexibility ensures that the standard is applicable to different types and sizes of submersible pumps.
Electrical Integrity Test System Specifications
Electrical Continuity and Resistance Tests
Tests of critical submersible pump motor components using resistance measuring instruments:
Test Components Test Method Normal Reading Abnormal Indication Motor Windings Ohmmeter measuring resistance between conductor pairs Low resistance value, within manufacturer's specifications Out of range value, indicating insulation damage or connection problems Thermal Switch Connected in series to measure continuity Closed circuit (normal temperature) Open circuit (overtemperature protection triggered) Humidity sensor Measure resistance between sensor leads High resistance or open circuit (no moisture) Low resistance (indication of moisture intrusion) Humidity sensor with check resistor Measure resistance of control cable leads Close to check resistance value Much below check resistance value (moisture intrusion) Megohmmeter resistance test
Must be performed immediately after completing the pump performance test per ANSI/HI 14.6. The test verifies the integrity of the motor insulation system and detects moisture intrusion.
Key acceptance criteria: The reading must be ≥2.0 megohms. Values below this indicate a failure in the insulation system or the presence of moisture, and the pump will fail the test. Continuity between ground and the motor frame must be verified before testing.
High Voltage Potential Test
The high voltage test is mandatory, but it should only be performed once, as repeated testing can degrade the motor insulation. The standard references several authoritative standards for test procedures:
- NEMA MG 1 - Motors and Generators
- IEEE 43 - Recommended Practice for Insulation Resistance Tests of Rotating Machinery
- CSA 22.2 108 - Liquid Pumps
- UL 778 - Electric Water Pumps
The acceptance criteria are based on the allowable leakage current to ground, which is determined by the manufacturer, reflecting the standard's recognition of the manufacturer's expertise.
Instrument Calibration and Measurement Uncertainty Management
Calibration Interval Requirements
The standard specifies the default calibration intervals for various types of test equipment to ensure the reliability and traceability of measurement results:
Equipment Type Calibration Cycle (Years) Special Requirements Temperature Electrical Equipment 2 Including thermocouples, RTDs, etc. Bulb Thermometer 5 Mechanical Thermometers have a longer calibration cycle Electrical Megohmmeter 1 High-precision insulation test equipment Dielectric high-voltage tester 1 Safety-critical equipment Ohmmeter 1 Basic electrical test equipment Bourdon tube pressure gauge 0.33 (4 months) Frequent calibration of mechanical pressure equipment Pressure transmitter 0.33 (4 months) Electronic pressure measuring equipment Measurement uncertainty calculation
The standard uses a Type B evaluation method for measurement uncertainty calculation, which is based on scientific judgment rather than a complete statistical analysis. The total measurement uncertainty is calculated as follows:
e = √[Σ(ux/u)²]
Where: e = total uncertainty of measurement (percentage), ux = probability of uncertainty in the quantity measurement, u = value of the quantity measured
The standard defines four probability distribution types and their application scenarios in detail:
Distribution type Application scenario Divisor Example Normal distribution Calibration certificate, manufacturer specification limits 2 (k=2, 95% confidence level) Pressure transmitter calibration data Rectangular distribution Statistical analysis of experimental results √6 Statistical results of dimensional measurement
Recommendations and best practices for standard implementation
Pre-test preparation
When implementing the ANSI/HI 11.6-2022 standard, it is recommended to follow the following preparation procedures:
- Contractual Agreement: Clearly stipulate the test type and acceptance criteria to be performed in the purchase contract
- Equipment Selection: Select the appropriate submersible pump type and test level based on the application scenario
- Personnel Qualification: Ensure that the test personnel have the appropriate qualifications and experience
- Instrument Preparation: Verify that all test instruments are within the valid calibration period
- Document Preparation: Prepare complete test record forms and report templates
Key Points for Test Execution
Pay special attention to the following key points when performing the test:
- Safety First: Strictly adhere to the safety limits of pressure testing to prevent overpressure operation
- Sequential Execution: Follow the test sequence recommended by the standard to ensure that previous tests do not affect subsequent tests
- Environmental Control: Perform the test in a controlled environment to reduce interference from external factors
- Data Recording:Fully record all test data, including raw data and calculation process
- Exception Handling:Establish a clear procedure for handling abnormal situations
Post-Test Management
After the test is completed, the following management work should be carried out:
- Document Preservation:Preserve test records for at least 5 years in accordance with standard requirements
- Result Analysis:Perform statistical analysis of test results to identify potential trends
- Improvement Measures:Develop equipment maintenance and improvement plans based on test results
- Knowledge Accumulation:Incorporate test experience and best practices into the organizational knowledge base
Technology Development Trends and Standard Outlook
With the continuous development of submersible pump technology, the ANSI/HI 11.6 standard is also evolving:
- Intelligent Testing: Popularization of remote witness testing and automated data acquisition systems
- Predictive Maintenance: Equipment life prediction and preventive maintenance based on test data
- Standardization Integration: Coordination and integration with other pump testing standards
- International Coordination: Further coordination and unification with international standards such as ISO
The ANSI/HI 11.6-2022 standard provides a scientific and systematic technical framework for the mechanical and electrical acceptance testing of submersible pumps. By standardizing test procedures, clarifying acceptance criteria, and providing detailed measurement uncertainty calculation methods, it ensures the reliability and comparability of test results, laying a solid foundation for the safe operation and performance assurance of submersible pumps.
ANSI/HI 11.6-2022 Referenced Document
- ANSI/HI 14.6 Rotodynamic Pumps for Hydraulic Performance Acceptance Tests
- IEEE 43 IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery
- UL 778 UL Standard for Safety Motor-Operated Water Pumps (Sixth Edition; Reprint with revisions through and including October 20@ 2017)
ANSI/HI 11.6-2022 history
- 2022 ANSI/HI 11.6-2022 Rotodynamic Submersible Pumps for Mechanical and Electrical Acceptance Tests
- 2012 ANSI/HI 11.6-2012 Submersible Pump Tests
