Guarantee

In the context of acceptance testing of a centrifugal pump a guarantee is provided to warrant compliance with contractually agreed physical values and technical properties of the pump (also see Warranty tolerance). 

The acceptance test codes of DIN EN ISO 9906 and the Hydraulic Institute (HI) use the term "guarantee" in the technical sense. The contractually agreed values are the basis for verification within the scope of the acceptance test. The values and properties to be guaranteed are selected to match the design and intended use of the centrifugal pump.

In order to fulfil the guarantee, the pump characteristics guaranteed in the purchase contract must in the acceptance test lie within the tolerance ranges of the measuring results as specified in DIN EN ISO 9906 or by HI.

Any detailed test to verify guaranteed data causes costs which should always be in economically reasonable proportion to the pump purchase price. Any rights and obligations that might result from non-compliance with agreed values are not the subject of the codes.