UB USER INSTRUCTIONS ENGLISH 71569247
®
If bearing temperatures are to be monitored it is essential that a benchmark temperature is recorded at the commissioning stage and after the bearing temperature has stabilized.
•Record the bearing temperature (t) adjacent to the bearing and the ambient temperature (ta)
•Estimate the likely maximum ambient temperature (tb)
•Set the alarm at
It is important, particularly with grease lubrication, to keep a check on bearing temperatures. After start up the temperature rise should be gradual, reaching a maximum after approximately 1.5 to 2 hours. This temperature rise should then remain constant or marginally reduce with time. (Refer to section 6.2.3.1 for further information.)
5.7.5Normal vibration levels, alarm and trip For guidance, pumps generally fall under a classification for rigid support machines within the International rotating machinery standards and the recommended maximum levels below are based on those standards.
Alarm and trip values for installed pumps should be based on the actual measurements
(N)taken on the pump in the fully commissioned as new condition. Measuring vibration adjacent to the pump bearings at regular intervals will then show any deterioration in pump or system operating conditions.
Vibration velocity – unfiltered | Horizontal | Vertical |
| |
mm/s (in./s) r.m.s. | pumps | pumps |
| |
Normal | N | ≤ 5.6 (0.22) | ≤ 7.1 (0.28) | |
Alarm | N x 1.25 | ≤ 7.1 (0.28) | ≤ 9.0 (0.35) | |
Shutdown trip | N x 2.0 | ≤ 11.2 (0.44) | ≤ 14.2 (0.56) | |
5.7.6 Stop/start frequency
Pump sets are normally suitable for the number of equally spaced stop/starts per hour shown in the table below. Check actual capability of the driver and control/starting system before commissioning.
Motor rating kW (hp) | Maximum stop/starts | |
per hour | ||
| ||
Up to 15 (20) | 15 | |
Between 15 (20) and 90 (120) | 10 | |
Above 90 (120) | 6 |
Where duty and standby pumps are installed it is recommended that they are run alternately every week.
5.8 Stopping and shutdown
a)
Close the outlet valve, but ensure that the pump runs in this condition for no more than a few seconds.
b)Stop the pump.
c)Switch off flushing and/or cooling/heating liquid supplies at a time appropriate to the process.
d)
For prolonged
5.9Hydraulic, mechanical and electrical duty
This product has been supplied to meet the performance specifications of your purchase order, however it is understood that during the life of the product these may change. The following notes may help the user decide how to evaluate the implications of any change. If in doubt contact your nearest Flowserve office.
5.9.1 Specific gravity (SG)
Pump capacity and total head in metres (feet) do not change with SG, however pressure displayed on a pressure gauge is directly proportional to SG. Power absorbed is also directly proportional to SG. It is therefore important to check that any change in SG will not overload the pump driver or
5.9.2 Viscosity
For a given flow rate the total head reduces with increased viscosity and increases with reduced viscosity. Also for a given flow rate the power absorbed increases with increased viscosity, and reduces with reduced viscosity. It is important that checks are made with your nearest Flowserve office if changes in viscosity are planned.
5.9.3 Pump speed
Changing pump speed effects flow, total head, power absorbed, NPSHR, noise and vibration. Flow varies in direct proportion to pump speed, head varies as speed ratio squared and power varies as speed ratio cubed. The new duty, however, will also be dependent on the system curve. If increasing the speed, it is important therefore to ensure the maximum pump working pressure is not exceeded, the driver is not overloaded, NPSHA > NPSHR, and that noise and vibration are within local requirements and regulations.
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