COMMISSIONING, START-UP AND SHUTDOWN
DESMI Pumping Technology A/S
Tagholm 1
9400 Nørresundby
– Denmark
Tlf. nr.: +45 96 32 81 11
Fax +45 98 17 54 99
E-mail: [email protected]m
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a risk of damage to the pump and, at worst, of a steam explosion. If the pump is not monitored, the
installation of a safety device is recommended.
Check in the electric motor manual if the bearings in the motor needs be lubricated with grease
before first start-up.
On pumps not running, the shaft shall be rotated at least 2-3 times monthly to avoid standstill
damage to shaft seal and bearings. If the pump is filled with liquid, it can alternatively be started up
shortly.
In special applications, it may require more frequent shaft rotation or start-up in order to avoid
seizing of the impeller and/or the shaft seal.
In pressurized systems, the shaft seal often leaks a bit during standstill
– in most cases the
leakage stops shortly after the pump is started up.
It is not recommended to lead liquid (either one way or the other) through a passively rotating
pump, as this may damage the shaft seal.
For the sake of the shaft seal lifetime, it is recommended to run at least 300 rpm and use max. 1
minute on acceleration from 0 to 300 rpm and max. 1 minute on deceleration from 300 to 0 rpm.
6.3.1. Start-up procedure
Before starting the pump check that:
- The shaft rotates freely without jarring sounds.
- The pump casing and the suction line are filled with liquid.
Start the pump for a moment to check the direction of rotation. If the direction is correct (i.e. in the
direction of the arrow) the pump may be started.
• The system piping is cleaned.
• The pump, suction line and inlet tank, if any, are vented and primed with the fluid to be
pumped.
• The lines for priming and venting are closed.
Содержание NSL 100-215
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