Danfoss S19 Installation, Commissioning And Maintenance

Contents

Danfoss S19 Installation, Commissioning And Maintenance Manual pdf 18 page image

User Guide | Plate Type Heat Exchangers, Single plate & Semi-welded - Installation, Commissioning and Maintenance18 | BC172686461130en-000201 © Danfoss | DCS (ms) | 2019.07Most common problems with a plate heatexchanger, can be solved by own trainedpersonnel. Fig.16 lists a summary of possibleproblems together with relevant possible causesand solutions.To maintain a continuous proper function of theplate heat exchanger ,it is essential to keep theoperating pressure and temperature within theranges stated on the nameplate.For nearly all leakage problems it will benecessary to dismantle the unit before anyattempts to rectify the fault can be made. Markthe area(s) where the leakage seems locatedwith a felt tip marker or similar beforedisassembling the plate heat exchanger. Followthe instructions in section "Opening the plateheat exchanger".“Cold leakage” is caused by a sudden change intemperature. The sealing properties of certainelastomers are temporarily reduced when thetemperature changes suddenly. No action isrequired as the gaskets most often re-seal afterthe temperature has stabilized.Exceeding these values, even as short-lastingpeaks, may damage the unit or could be thecause of problems/issues.To avoid costly repairs, it is recommended tohave the installation and maintenance carriedout by properly trained personnel.TroubleshootingProblem Possible cause Possible solutionLeakageConnection sealing damagedCheck the rubber liners (if fitted)Check the flange gasket (if fitted)Check the ring gasket at first plateFit the pipes tension-freeMixing of primary and secondary circuitCheck the plates for holes and/or cracksSingle plate: Check the gaskets around theport and diagonal areasSemi-welded: Check the diagonal part of thefield gasket and ring gasketPlate package sealing damagedCheck the assembly distance "A"Check the condition of the gasketsCheck the proper position of the gasketsThe operating conditions deviate from thespecification Adjust the operating conditionsInsufficient capacityAir in the system Vent the piping systemCheck the pipe work for possible air trapsThe operating conditions deviate from thespecification Adjust the operating conditionsThe heat exchanger is fouled internally Clean the heat exchangerThe connections have been interchanged Redo the pipe workToo highpressure dropFlow larger than the design flow Adjust the flowChannels in plates blocked Flush / cleanIncorrect measurement Check the pressure indicatorFluid deviating from the specification Check the chemical compositionAir in the system Vent the piping systemCheck the pipe work for possible air trapsFig. 16. Summary of possible problems, causes and solutions

/ 20

Related manuals for Danfoss S19