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Possible Cause In Symptom Order Of Probability Test for Cause Correction PUMP 12. Air leakage in suction 12. Check suction by placing thumb 12. If suction is weak check each CYCLES 13UT line or blocked suction. over suction hose. Suction should be pipe or tubing joint for suction leak. WILL NOT substantial and increasing. Use teflon tape or pipe dope on all PRIME OR joints. Remove pump from service. MAINTAIN Pressurize discharge at 30 psi (2 PRIME bars) with air and block suction. Use soap solution to find leak. 13. Check ball valves 13. If pump is used to pump slurries 13. Remove discharge and suction blocked open by debris. or particulates, pump should be manifolds. Carefully remove check flushed with clean fluids before shut ball seats and wash clean. Hold down: Slow cycling rate of pump with ball lightly in seat and test seat by air valve then repeatedly open and suction on opposite side of seat. close discharge valve. If pump still Leakage past seat should be slight will not prime, proceed to correction. to none. 14. Suction lift too high. 14. Refer to the suction lift specifica- 14. Suction lift bordering on maxi- tions. mum. Reduce lift or wet check valves by pouring fluid into dis- charge. Set cycling rate at 90 to " 120 cycles per minute. 15. Cycle rate too high or 15. Maximum suction lift obtained at 15. Change cycling rate up and low. about two to three cycles per second. down with air flow control valve not air pressure regulator. 16. Viscosity of fluid high. 16. Reduce air volume with air flow 16. Use short, large diameter suc- control valve - slowing to one stroke tion lines; diameter twice nominal in 5 seconds. If performance im- pump size is common. Wet check proves, problem is high viscosity bails by force feeding in suction fluids. port. Use flooded suction, that is pump Is lower than fluid being pumped. Extremely high viscosity fluids or pastes may require a fol- lower plate or a closed plastic bag to prevents suction air holes. 17. Too much air volume for 17. Reduce air volume with air flow 17. Reduce air volume to zero,then fluid being pumped. control valve between pressure regu- slowly increase while listening to lator and pump. pump cycle. Air volume is too high when pump sounds erratic. DISCHARGE 18. Check balls not seating. 18. Same as 13. 18. Same as 13. ERRATIC 19. Suction leakage on suc- 19. Inspect outer chamber and inter- 19. Tighten clamps and bolts as re- tion side of pump or tine. mediate joint around clamp using quired. soap.solution. Soap joints to cause soaping solution to completely cover , joint being tested. If there is a suc- tion teak, the suction will pull a hole throught the soap bobbies. 20. Remove pump from service. 20. Repair leak by tightening fas- Wash out any chemicals. Then plug teners. replacing O-rings, repairing suction line. Pressurize discharge damaged seal areas. Use a Teflon with 30 psi 12 bars) air. Use soap so- pipe paste on O-ring seals to ensure lution to Inspect for leak. a good seal. AFG 3194 Page 4 Z08.025TOC