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API 675 test bed for ProMInent process pumps

ProMinent has invested around €500,000 in a new pump test bench which is enabling it to undertake further development of its process metering pumps. This includes even the highest performance ranges and pumps to meet API 675 guidelines, thereby ensuring that process safety is guaranteed when metering and handling flammable, toxic, solids-laden or highly viscous fluids.

Known for decades as a major player in the low pressure diaphragm metering pump segment, ProMinent has also been establishing itself for many years as a provider of process metering pumps. The investment of around €500,000 in a new pump test bench enables ProMinent to ensure product quality and undertake further development, even in the highest performance ranges, and test performance profiles adapted to specific applications and customer specifications according to the state of the art. ProMinent can now also test pumps to meet API 675 guidelines (American Petrol Institute guidelines for oscillating displacement pumps for use in the crude oil, chemical and gas industries) for metering and handling flammable, toxic, solids-laden or highly viscous fluids. The new test bench for process pumps became operational in Heidelberg at the start of 2011. Manufactured throughout from stainless steel 1.4301, the test bench comprises two independently operated test stations, each of which is equipped with a centralised power supply, monitoring equipment and a supply to the test bay. A computer integrated console controls and parametrises the individual components of the test bench, enabling the test bench to be operated centrally. All of the requisite parameters inputted are monitored, analysed and documented by an operating data collection system.

Performance ranges

All process pumps with a motor capacity of 0.37 to 90 kW with 400 V and 5.5 to 160 kW with 690 V can undergo variable performance tests. A hydraulic line is supplied to the test pieces for this purpose and, depending on the type of pump and any customer-specific requirements, the pumps will transport a certain volume of water against a back pressure that can be set by the operator. The measuring range for the flow ranges from 20 l/h to 90,000 l/h and the measured value has an accuracy of 0.1% right across the given range. This is guaranteed by the use of highprecision Coriolis flow meters.

Metering medium

interesting feature of the new test bench is the metering medium used: ultra-high quality water, treated in an environmentally- friendly way according to the state of the art and permanently monitored. A made-to measure water treatment plant, designed and manufactured in ProMaqua's in-house plant engineering department, guarantees that the pumps to be tested are fed with a medium to a high degree of purity.

During operation, the water in the test circuit is continuously filtered and the differential pressure is monitored to ensure that contamination can be identified at an early stage, allowing any contamination that occurs to be reliably removed. The water is then disinfected and cleaned using ozone, thereby helping to protect the test bench against possible contamination. The water quality is continuously monitored by measuring the conductivity, pH value, redox potential and turbidity and the pH value is automatically regulated. The water quality and all relevant operating parameters are documented throughout the entire test procedure.


The new process pump test bench from ProMinent is designed to comply with the state of the art. Data are automatically generated for each pump being tested and specific test documents are produced. Complex water treatment processes developed by ProMaqua ensure a constant quality of water – the basis for reliable test results.

The test bench means that pumps can undergo performance testing with high-precision accuracy at maximum volume and maximum operating pressure. Additional tests, such as pressure testing, performance characteristic lines and tests to comply with API 675 can be offered to customers, depending on their requirements, and a high level of flexibility can be ensured, thanks to the option of parallel testing.