SPP id: Version 14 > / 150201 / Replaces 140901 / en /
N31568
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Series
2.15
INSTRUCTIONS
February 2015
Page
ISO
G
COPYRIGHT © SULZER PUMPS FINLAND OY
ORIGINAL INSTRUCTION
USER'S MANUAL – AHLSTAR
Safety instructions
Cause:
Consequence:
Gland packing tightened too much.
Adequate sealing water service neglected.
- Sealing water pump not started
- Sealing water valve not opened
- Sealing water equipment incorrectly adjusted
- Quality of the sealing water does not match our requirements.
Inlet pressure incorrectly estimated when the pump was originally selected.
Pump is not properly filled with the pumped liquid.
- Suction valve not opened
- Suction tank not properly filled
- Suction piping resistance or air tightness improperly checked
High temperatures (Sealing unit)
Pump lubrication carried out inadequately.
- Oil/grease filling neglected
- Oil/grease quality incorrectly selected
- Relubrication carried out inadequately
Pump washdown carried out inadequately (sprayed water enters the bearing
unit).
Properties of the pumped liquid incorrectly estimated when the pump was
originally selected.
High temperatures (Bearing unit)
8 Balance and vibration
The pump is normally balanced in accordance with grade G 6.3 of ISO 1940, in special cases with grade G 2.5 of
ISO 1940. Vibration does not exceed the vibration severity limits given in Table 2 when measured at the
manufacturer’s test facilities. These values are measured radially at the bearing housing at rated speed and flow
when operating without cavitation.
A pump equipped with a specially designed impeller may exceed the limits given in Table 2.
Table 2, Max. r.m.s values of vibration velocity
Pump installation
Shaft centerline height H1
≤
225 mm
>
225 mm
Pump on a grouted baseplate or on a concrete baseplate
3 mm/s
4.5 mm/s
Pump on a baseplate without grouting
4.5 mm/s
7.1 mm/s
9 Wet
end
9.1 Admissible forces and moments on pump flanges
Forces and moments acting on the pump flanges due to pipe loads can cause misalignment of the pump and driver
shafts, deformation and overstressing of the pump casing, or overstressing of the fixing bolts between the pump and
baseplate.
This is a simple method for checking that loads transmitted to a pump by its piping remain within acceptable limits.
This is done by comparing the loads (forces and moments) calculated by the piping designer, with the maximum
values allowed on the flanges, as a function of their size and the installation conditions.
The basic values given in Table 3 are applicable to each of the pump flanges, respecting the sign convention of the
three axes through the flange. The values can be applied simultaneously in all directions with positive or negative
signs, or separately on each flange (suction and discharge).