TCS900003, Rev.6
04/26/2016
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Page 47
Meter Trouble Shooting
PROBLEM: Leaking packing gland and/or housing
A) Check to see whether any O-Rings have been damaged or cover bolts have not been tightened enough.
B) Two common causes of packing gland leakage are thermal expansion and hydraulic shock.
C) If two valves in a piping system (on either side of the meter) are closed, isolating the meter, and if the temperature
rises as little as 1ºF in the system, the possible rise in pressure due to temperature would exceed the working pressure
rating of the meter. To avoid this hazard caused by thermal expansion, a pressure-relief valve must be installed in the
system near the meter.
D) Hydraulic shock occurs when a large volume (mass) of liquid is moving through a pipe line at normal operating flow
rate and a valve is suddenly closed. When the flow is so suddenly stopped, the entire mass of the liquid in the piping
system acts as a battering ram, causing a shock effect within the meter. The greater the mass, length of line and/or
velocity, the greater the hydraulic shock. Since the valve is usually located at the meter outlet, the meter housing,
packing gland and the meter internal components receive the full impact of this hydraulic shock. To prevent this
hazard, a slow closing two-stage valve should be used in conjunction with the metering system. On those systems
where mass, length of line, etc. are of such magnitude as to preclude the elimination of hydraulic shock with the use of
a two-stage slow closing valve, an impact-absorbing air cushioning device should be used.
PROBLEM: Product flows through meter but register does not operate
A) Gear train motion interrupted by non-functioning gear due to broken pin or key. Replace pin or key where required.
B) If all meter parts are moving then problem is in register.
C) Remove register from meter. If all meter parts are moving but output shaft of adjuster assembly is not, adjuster is
worn and must be replaced.
D) If totalizer numerals (small numbers) on register are recording, but the big numerals are not moving, register needs
repair.
PROBLEM: Product flows through meter but register does not record correctly
A) Adjuster assembly not properly calibrated, See METER CALIBRATION on page 13 for more instructions.
B) The factory installed gear train may have incorrect gearing ratio.
C) Check register for defects.
PROBLEM: No flow through meter
A) Faulty non-functioning pump.
B) Foreign matter within the system, meter or components.
C) Meter has a broken rotor or rotor shaft.
D) Excessive wear on timing gears or bearings.
E) Meter “frozen” due to build-up of chemical “salts” inside metering chamber, sufficient to stop rotation of rotors.
F) Valve not open or not functioning.
PROBLEM: Meter runs too slow
A) There is a flow restriction within the system (tees, elbows, valves, etc.)
B) Foreign matter in system, meter or components.
C) Product viscosity is different or has changed from what was originally known.
D) Meter gears or rotors partially “salted” enough to slow up rotation of parts.
E) Valve internal mechanism faulty. Valve does not open fully or the linkage is not properly adjusted.
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