TP0003B
BM BULKMETER
Chap 6
Page 1
FAULT FINDING
Chapter 6
FAULT FINDING
1 GENERAL
1.1
1.2
1.3
Because of the simple robust design of the bulkmeter, in most instances fault finding is limited to the
location and rectification of leaks. The following table lists faults that may be more difficult to
diagnose, their possible cause(s) and remedy.
In cases
wher
e the accuracy of the meter is in doubt, testing and calibration as in Chapter 5 Para 13
is to be carried out. If such calibration proves ineffective the bulkmeter should be removed from
service and returned to Liquid Controls for overhaul and repair. If this is not practical, the appropriate
procedures described in Chapter 5 may be carried out by a suitably qualified person providing full
workshop facilities are available.
It must be remembered that the fault table is a guide only and may not cover all possible faults.
Operation and maintenance procedures correctly carried out should keep faults to a minimum.
TABLE 1 - FAULT FINDING
FAUL T POSSIBLE CAUSE(S) REMEDY
No flow Zero line pressure Investigate system and rectify.
Control valve closed Open control valve.
Seized Bulkmeter rotor Refer to Chapter 5, dismantle
clean, inspect and renew
components as necessary.
Reassemble and test.
Reduced/Erratic Flow Fluctuating line pressure Investigate system and rectify.
Control valve not fully open Open control valve.
Partially seized rotor Refer to Chapter 5, dismantle
clean, inspect and renew
components as necessary.
Reassemble and test.
Overspeeding System not bled free of air/vapour Bleed system. If fault persists
consider fitting air separator
upstream of meter.
Rate of flow indicator contaminated Ingress of water to calibrating
mechanism
Calibrating mechanism overfilled
with oil
Locate and cure the leak.
Lubricate calibration mechanism
with GREASE (see Chapter 4).
Renew Rate of flow indicator.
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