KSB moviBOOST VP, Operating Instructions Manual

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moviBOOST VP
20
12 Inspection
KSB offers inspection services to relieve you as far as possible
of the routine necessity of inspecting your moviBOOST
package unit(s). Take advantage of this additional after-sales
service by taking out a maintenance contract with KSB. Get in
touch with your Service Partner for details.
13 Check list
In the event that you decide to conduct your own inspections,
proceed according to the following check list at least once a
year :
1. Check the pumps and drives for quiet running and the
mechanical seal for integrity.
2. Check the flexible transmission element for wear.
3. Check the function and seal condition of the shut-off, drain
and non-return valves.
4. Clean the strainer in the pressure reducer (if applicable).
5. Check the expansion joints for wear (if applicable).
6. Verify the pre-charge pressure level and check the
accumulator for integrity, if required (see section 14 pre-
set pressure table).
7. Check automatic switching.
8. Check the ON and OFF points of the unit.
9. Check if the functional check run is working.
10. Check the function of the overall system and compare the
actual data with the name plate data.
11. Check the water inlet, inlet pressure, lack-of-water
monitoring, flow monitoring and pressure reducer.
12. Check the inlet tank and float valve, if applicable. Check
the overflow for integrity and cleanliness.
14 Pre-charge pressure
The pre-charge pressure in the accumulator should be set to
a value which is 10% lower than the set start-up pressure.
The setting can be effected via a valve located under the cover
at the top of the accumulator.
Pre-charge pressure table
Pre-charge pressure of accumulator
p = 0.9 x p
E
; p
E
= unit start-up pressure
Recommendation
Fill the accumulator with nitrogen only (risk of corrosion).
The stated values are average values. Tests on accumulators
have shown that
pressures >3 bar for factor 0.9 and
pressures <3 bar for factor 0.8
result in the best storage volumes.
Example :
p
E
= 5 bar pre-charge pressure 5 x 0.9 = 4.5 bar
p
E
= 2 bar pre-charge pressure 2 x 0.8 = 1.6 bar