Watson-Marlow SP Series - Manual (Page 27)

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The filling degree of the pump hose
is too low, because the speed is too
high in relation to the viscosity of the
product to be pumped and the inlet
pressure. The suction line can be too
long or too narrow or a combination
of these factors. Consult your Bredel representative for a
recommendation.
Suction and discharge lines are not
secured correctly. Check and secure pipework.
High pump speed with long suction
and discharge lines or high product
specific gravity or a combination of
these factors. Reduce pump speed. Reduce the line
lengths on both suction and discharge
where possible. Consult your Bredel
representative for a recommendation.
Vibration of the pump and
pipework.
Too narrow diameter of suction
and/or discharge line Increase the diameter of the
suction/discharge lines.
Broken front cover bolts Pump cover (dis)mounted with the
hose in the pump Never (dis)mount the pump cover when
the hose is still in the pump
Chemical attack of the hose. Check the compatibility of the hose
material with the product to be pumped.
Consult your Bredel representative for
correct hose selection.
High pump speed. Reduce pump speed.
High discharge pressures. Maximum working pressure 16 bar.
Check that the discharge line is not
blocked, the shut-off valves are fully
opened and the pressure relief valve
functions properly (if present in the
discharge line).
High product temperature. Consult your Bredel representative for
correct hose selection.
Short hose life.
High pulsations. Restructure the discharge and inlet
conditions.
Insufficient or no hose lubricant in
the pumphead. Add extra lubricant, see “Maintenance”:
“Changing lubricant”.
No original Bredel lubricant. Consult the Bredel representative for the
correct lubricant.
Hose pulled into the pump.
Extremely high inlet pressure - larger
than 300 Kpa. Reduce the inlet pressure.
Hose blocked by an incompressible
object in the hose. The hose cannot
be compressed and will be pulled
into the pump housing. Remove hose, check for blockages and
replace if necessary.
Bolts of flange bracket loose. Tighten to the specified torque settings
(see ‘Torques’).settings, see
“Specifications”: “Torques”.
Lubricant leakage at flange
bracket.
Bolts of hose clamps loose. Tighten to the specified torque settings
(see ‘Torques’).settings, see “Torques”.