14.STANDARD HEAT TRANSFER SYSTEM TROUBLE SHOOTING CHART
ProblemCauseCorrective Action System temperature too high for oilSee fluid manufacturer’s data forcausing vapor lockmaximum oil temperatureVapors lock due to steam or air in oilBleed air &steam from system, changeInsufficient suction pressure (0 oroil if problem continues J vacuum), pump noisy, gaugesNet positive suction pressure too lowRaise expansion tank to increase suctionvibrating, discharge pressure lowhead, static head should be 4-5 psig.(below 20 psig)(See expansion tank location No. 6)Strainer pluggedRemove and clean strainer
Valve closedCheck all valvesHigh discharge pressure over 40 psig,System piping blocked or restrictedCheck all valves, check strainerpressure gauges fluctuating rapidly,Check process piping sizing, check for K pump noisy, expansion tank normal,closed valves or improperly installedsystem operating on bypass reliefProcess piping blocked or restrictedautomatic valves, check all bleed valvevalves for air or steamSteam or water in oilBleed system, change oil
Expansion tank too lowExpansion tank should be mounted 15 ft. L Expansion tank overflows or “burps”above system(over 220°F)Expansion tank line too shortLengthen expansion tank line to cool oiland provide cold oil sealTank too small for systemCheck volume on process pipingOver-temperature control openSet
thermostat above process temperature M Control relay #1 will not closeand resetPressure switch not closedSee NSwitch set wrongSet pressure switch to approximately 5 psiover suction gauge pressureCheck pump & motor rotation, see arrow N Pressure switch will not closePump running backwardson motor, reverse phase lead on circuitbreakerNot enough or no fluid in systemCheck fluid levels in expansion tank,make sure all valves are openPump cavitatingSee OBleed system periodically until all air orstem is removedAir or steam in systemInsufficient bleed valves in process O Pump noisy and/or cavitationpiping to remove trapped airContaminated oilChange oil
Pump damaged by overtightenedpacking glandReplace pumpInsufficient suction pressureSuction pressure should be 4-5 psig
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