3.10.1 ISO standard pumps

ISO standard pumps

ISO standard pumps, also called ISO pumps are standard pumps according to the international standardization body ISO, which has issued a standard recommendation, ISO 2858, for horizontal centrifugal pumps in pressure class PN 16 (maximum pressure 16 bar or 1.6 MPa).

By default, all connection dimensions are shown, Figure 3.70, and performance. These cover the head height 5-140 m and the volume flow 3-300 m³ / h.

Apart from special pumps for various purposes, standard pumps cover acc. ISO approximately 80% of all needs in the field of centrifugal pumps.

Figure 3.70 Standard pump acc. ISO. The dimensions and flange dimensions indicated by arrows are standardized.

The constructive structure of the ISO pumps is called “back pull-out” – Figure 3.71 – ie dismantling of the pump rotor takes place on the motor side after the motor or usually a spacer in the shaft coupling is removed.

The construction is further based on a kit system with 3-4 bearings comprising shaft with bearing housing, shaft sealing element, etc.

Most manufacturers – at least thirty in Europe – all have a comprehensive delivery program for material grades and shaft seals. There are even sealless pumps with ISO built-in dimensions and performance.

It should be noted that the ISO standard covers only dimensions and performance, which is why a qualitatively questionable design can meet the standard. In procurement, therefore, supplementation should be made with reference to some quality standard or at least some minimum requirements should be set for shaft deflections and ball bearing life.

Figure 3.71 Back pull-out construction.