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Series
2.15
INSTRUCTIONS
November 2014
Page
ISO
G
USER'S MANUAL – AHLSTAR
Preventive maintenance
COPYRIGHT © SULZER PUMPS FINLAND OY
ORIGINAL INSTRUCTION
1.1 Temperatures
During operation, the following surface temperatures are to be observed regularly:
volute casing (102.11)
bearing housing (330.31)
shaft sealing, measured from the casing cover (161.21) or from the stuffing box housing (451.21)
casing (100.21) measured at both the suction impeller and mechanical seal (liquid ring pumps (-LM, -S))
motor
(800.41)
The reasons for any deviations in temperatures are to be checked immediately to prevent further and more serious
damage.
1.2 Noise and vibration analysis
A regular follow-up of the pump noise and vibration gives a good view regarding the condition and wear of bearings
and also other wearing parts of the pump. This enables timely predictive maintenance routines and reduces the
potential for unexpected shut-downs. Admissible vibration severity values are presented in Section ”Safety
instructions/Balance and vibration”.
1.3 Discharge pressure
A regular control of the pressure generated by the pump, the rated flow and the power need of the drive unit gives a
good view regarding the condition and wear of the hydraulic parts of the pump. The follow-up enables such
preventive maintenance actions as clearance adjustments or parts renewals to be scheduled accordingly.
1.4 Pump washdown
The pump is designed to prevent external liquids from entering the bearing unit. However, direct spraying of high-
pressure water to the labyrinth rings (423.31 and 423.32) must be avoided.
2 Wet
end
2.1 Corrosion and wear
When the pumps are operating under corrosive and/or abrasive conditions, a regular follow-up of wall thicknesses in
the case and case cover is necessary. When the wall thickness has worn more than the permitted corrosion
allowance of 3.0 mm, the mechanical durability (pressure limits) stated in these instructions is no longer guaranteed.
Due to the casting tolerances (ISO 8062-3: 2007), the nominal wall thicknesses stated in the casting drawings
cannot be used for assessing excessive corrosion and wear. If corrosion and wear are expected, the wall
thicknesses of the volute case and case cover should be measured at specific points before the first start-up. These
values serve later as reference values for assessing excessive corrosion and wear.
2.2 Adjustment of clearance between sideplate and impeller
If the pump has an adjustable sideplate (135.11), the clearance between the impeller and sideplate is adjusted
without disassembling the pump as follows (Fig. 1):