Pulsafeeder Pulsa GLM DM7 - Manual (Page 27)

27
DIFFICULTY PROBABLE CAUSE REMEDY
Delivery erratic
Leak in suction line Locate and correct
Product cavitating Increase suction pressure
Entrained air or gas in product Consult factory for suggested venting
Motor speed erratic Check voltage and frequency
Fouled check valves Clean, replace if necessary
Inadequate backpressure
Increase discharge pressure to obtain a
minimum pressure difference of 5 psi from
suction to discharge
Delivery higher than rated
Suction pressure higher than discharge
pressure Install backpressure valve or consult
factory for piping recommendations
Back pressure valve set too low Increase setting
Vack pressure valve leaks Repair, clean or replace
Noisy gearing, knocking
Discharge pressure too high Reduce pressure
Water hammer Install pulsation dampener
Low oil level
Examine sight glass on side of pump, add or
replace oil as required.
Piping noisy
Pipe size too small
Increase size of piping - install pulsation
dampener
Pip runs too long Install pulsation dampener in line
Pulsation sampener inoperative or flooded
Refill with air or insert gas. Inspect and replace
diaphragm and recharge
No surge chamber or dampener used Install pulsation dampener
Motor overheats
Pump overloaded
Check operating conditions against pump
design. Verify discharge pressure
High or low voltage Check power source
Loose wire Trace and correct
Incorrect motor wiring Verify and correct
Oil level low Check and add as cecessary