Blagdon Pump B25 Manuel d'entretien et d'utilisation - Page 7

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TROUBLE SHOOTING GUIDE
NOTE :- Check all solutions before dismantling the pump.
PROBLEM
Pump will not start
Erratic flow
Pump strokes but will not
discharge
Fluid discharged from air
exhaust
Intermittent stroke rate
ATEX Certified units :- X25
These models are certified to :-
Non-electrical equipment for potentially explosive atmospheres,
: EN13463-1 : 2001
'c' - Internal control of production.

Grounding the pump :-

The Atex approved units are supplied with a natural earth ground
cable. This cable is 2 meters in length and permanently connected
through a nut and bolt at the inner cover casting. The other end is free
to connect to the nearest available suitable point to provide a natural
earth ground. This must be done to reduce the risk of electro-static
sparking.
HG-CF-921 Rev. L - 28.07.05
CAUSE
Air valve assembly malfunction/Seizure
Obstructed fluid line.
Obstructed diaphragm chamber.
Diaphragm failure causing fluid & excessive air to be
expelled through the exhaust.
Diaphragm seal failure.
Air valve system malfunction.
Air connected to exhaust.
Diaphragm failure on one side.
Valve ball not seating.
Suction leakage.
Diaphragm failure causing fluid & excessive air to be
expelled through the exhaust.
Diaphragm seal failure.
Air valve system malfunction.
Excessive suction lift.
Suction line leakage.
Valve ball not seating correctly or damaged.
Suction line or strainer clogged.
Diaphragm failure.
Diaphragm Failure.
Loose frontplate.
Over lubrication
Diaphragm shaft seal failure.
Air valve system malfunction.
Valve ball not seating / partially obstructed.
II 2 GD c
WARNING!
Take action to prevent static sparking. Fire or
explosion can result, especially when handling
flammable liquids. The pump, piping, valves,
containers or other miscellaneous equipment
must be grounded.
SOLUTION
Check carrier for freedom of movement. -
Clean, oil & replace.
Clean line or increase line size.
Remove obstruction.
Replace diaphragm.
Replace shaft seals.
Check all seals in valve chest assembly.
Re-connect to air inlet.
Replace diaphragm.
Check and remove obstruction.
Check and correct.
Replace diaphragm.
Replace shaft seals.
Check all seals in valve chest assembly.
Shorten suction line.
Check and correct.
Check and remove obstruction / replace.
Clear.
Replace diaphragm.
Replace diaphragm.
Re-Torque to manual specifications.
Shut-down pump. Remove air connection
into pump & introduce a small quantity of de-
greasing agent into air valve and replace
line. Run pump until clear.
Replace seals.
Check all seals in valve chest assembly.
Clear obstruction.
Page 7