PD ISO/TR 19688:2019

What is PD ISO/TR 19688 - Rotodynamic pumps about?

PD ISO/TR 19688 discusses Rotodynamic pumps. Rotodynamic pumps A pump is a mechanical device generally used for raising liquid from a lower level to a higher one. This is achieved by creating low pressure at the inlet and high pressure at the outlet of the pump. PD ISO/TR 19688 describes hydraulic performance tests (including cavitation tests) using a small size pump (centrifugal, mixed flow or axial pump, hereinafter referred to as a “model pump”). PD ISO/TR 19688 is used for pump acceptance tests with a geometrically similar model pump to guarantee the performance of a large size pump manufactured for practical use (hereinafter, a “prototype pump”). PD ISO/TR 19688 however does not preclude a temporary assembly inspection or other tests on the prototype pump. Moreover, it is preferable to conduct the tests with prototype pumps unless-

• The capacity of the pump, namely its flow rate and/or its power input, is beyond the limitations of the test facility, though it is difficult to set a criterion for carrying out a model pump test instead of the prototype pump test in terms of the volume rate of flow or the power input
• A part of the pump is to be constructed by concrete walls and reproduction of the whole assembly is impractical
• Model tests are specified by the purchaser
• It is difficult to carry out the prototype pump test due to any other reasons

PD ISO/TR 19688 applies to performance tests under steady operating conditions corresponding to the prototype pump.

Who is PD ISO/TR 19688 - Rotodynamic pumps for?

PD ISO/TR 19688 on Rotodynamic pumps is applicable to:

• Hydraulic pump equipment manufacturers
• Design engineers
• Quality control personnel

Why should you use PD ISO/TR 19688 - Rotodynamic pumps?

A rotodynamic pump is a kinetic machine in which energy is continuously imparted to the pumped fluid by means of a rotating impeller, propeller, or rotor, in contrast to a positive displacement pump in which a fluid is moved by trapping a fixed amount of fluid and forcing the trapped volume into the pump's discharge. Implementing PD ISO/TR 19688 you can construct a pump system with a higher precision due to the difference in measurement uncertainties and a shorter delivery period(s) of the prototype pump. Minimizing costs with respect to material and other resources can be achieved with the help of PD ISO/TR 19688.

Also, by the implementation of PD ISO/TR 19688, by means of the similitude theory, a model pump is used to assess and calculate the ability of the real pump to be built. PD ISO/TR 19688 describes testing methods using model pumps for hydraulic performance acceptance tests in addition to other testing methods. Using PD ISO/TR 19688 you can describe hydraulic performance tests (including cavitation tests) using a small size pump.