GB/T 13469-2021Economical operation for centrifugal, mixed flow and axial flow pump systems (English PDF)

4.3 Requirements for installation, commissioning and acceptance of the pump systems

4.3.1 The installation shall be carried out by a dedicated installation technician in accordance with the installation provisions of the manufacturer.

4.3.2 The determination of the installation site and location shall fully consider the convenience of operation and management; and reserve necessary maintenance space.

4.3.3 After installation of the pump system, online debugging shall be carried out to check whether the pump is out of the high-efficiency zone where the pump is allowed to operate; and perform the test in accordance with Clause 6. the inclination shall be no less than 0.5%;

c) The suction pipeline layout and flow rate of large centrifugal pumps, axial flow pumps and mixed flow pumps shall be selected so that the suction medium does not produce vortex, cavitation, etc.;

d) The bottom valve should not be used in the suction pipeline;

e) In order to ensure the suction performance of the pump, the medium flow rate of the suction pipe for conveying clean water at room temperature shall be less than 2m/s.

4.4.2.10 The discharge pipeline shall meet the following requirements:

a) For the connection between the branch pipe and the main pipe, an oblique connection should be used instead of a straight connection;

b) No additional resistance valve or micro resistance valve should be used;

c) The discharge pipeline shall adopt economical flow rate, and the flow rate of clean water at room temperature shall be 2m/s~3m/s.

4.4 Reasonable use requirements of pump systems...

4.4.3 Economical operation of the system

4.4.3.1 Applicable control and regulation systems shall be adopted according to the user's flow and head requirements.

4.4.3.2 For long running time, large load changes and discontinuous operation conditions, a regulating device system including a variable frequency speed regulating device should be used. The application technical conditions of the variable frequency speed regulating device shall comply with the provisions of GB/T 21056.

4.4.3.3 When the flow rate variation is less than 20%, or the annual operating time is less than 4000h, the following flow adjustment methods should be adopted, including:

a) The throttling method can be used for small centrifugal pumps;

b) For mixed flow pumps and axial flow pumps, the flow rate and head can be adjusted through changing the installation angle of the blades or adjusting the inlet guide blades;

c) When the change range of flow rate is less than 10%, the variable flow constant pressure method shall be adopted;

d) Voltage reduction and power saving technology can be used when the motor is lightly loaded.

4.4.3.4 The equipment and pipe network that transport high (low) temperature medium

4.5.2.3 For pumps with a capacity of 100kW and above, economic indicators of the systems should be tested regularly.

4.5 Management of economical operation for pump systems...

4.5.3 Requirements for finding and troubleshooting faults

4.5.3.1 Once a failure occurs, the cause of the failure shall be analysed and eliminated in time; and the results of the failure shall be recorded in detail.

4.5.3.2 The following should be recorded when the system fails:

a) Failure overview (time of failure, description of failure and failure phenomenon, working conditions and environmental conditions at the time of failure, name of the person who discovered the failure);

b) The nature of the failure;

c) The fault characteristics of the product performance (the measured value of the fault parameter and the minimum required value of the parameter);

d) Analytical opinions and suggested corrective measures related to failures.

4.5.3.3 The following failure maintenance information shall be recorded:

a) Failure verification (the used instruments and methods, description of observation results);

b) Repair instructions (the taken measures, repair date, name of maintenance personnel);

c) Description of the replaced parts (part name, model, supplier, failure cause and classification opinions).

5.5 Judgment and evaluation of the system

5.5.1 If all equipment and units in the system meet the economical operation requirements specified in

5.4 at the same time, then the system shall be considered to be operating economical. If all equipment and units in the system meet the reasonable operation requirements specified in

5.3 and 5.4, and there are no uneconomical operation items, then the system shall be considered to be operating reasonable. If one of all equipment and units in the system is judged to be uneconomical, then the system shall be considered to be operating uneconomical.

5.5.2 If the power consumption per ton by 100 meters of liquid transported by the system meets the qualified index requirements in GB/T 16666, then the system shall be considered to be operating economical. If it does not meet the qualified index requirements in GB/T 16666, the system shall be considered to be operating uneconomical.

6.2 Requirements for measuring instruments

6.2.1 The measurement range of the measuring instrument shall meet the measurement requirements of the relevant parameters of the pump system; and it should be ensured that the usual measured value is within the range of 1/2 ~ 2/3 of the relevant instrument.