Suction Line - Richter MNK serie Sicherheits- Und Installationshinweise

Safety and installation instructions for Richter pumps
The velocity in the suction line should not exceed 2.0 m/s and 5.0 m/s in the discharge line. When
determining the suction line nominal size, the NPSH-value (Net Positive Suction Head) must be
observed. The NPSHR-value required for the pump is specified in the data sheet.
The NPSHA-value available in the plant should be at least 0.5 m higher than the
NPSHR-value required for the pump. Otherwise, this will lead to a drop in the delivery
head, cavitation or even failure of the pump.
2.5.5.2 Nozzle loads
The pump can be subjected to nozzle loads in accordance with ISO 5199 [MNKA, RMA, RSA:
ANSI/HI 9.6.2]. See also TIS 0541-02-006. Changes in the length of the piping caused by tempera-
ture are to be allowed for by appropriate measures, e.g. the installation of expansion joints.
2.5.5.3

Suction line

The suction lines must always be laid on a rising gradient towards the pump. Otherwise, gas bub-
bles may form which considerably reduce the suction line cross section. Eccentric transition ele-
ments must be installed between different pipe diameters. Valves which disrupt the course of flow
should not be installed directly upstream of the pump.
Fig. 6: Suction line
A Suction line
B Suction nozzle of pump
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Installation > Piping
Richter Pumpen / pumps