9
Startupoperations
UV‐radiation can damage the housing parts of pumps made of PE (material code E and F). In general, the
pump has to be connected load free. Neglecting this causes leakage and maybe even damages. To avoid
vibrations, pulsationdampersand compensators are recommended. Before connecting the pump,
take the
yellow blind plugs out of the suction and discharge connections as well as the air inlet [23] in the center
housing [4]. The air inlet is located bel ow the bilingual sticker with safety instructions. The connections of
ALMATECair‐operateddiaphragmpumpsmadeofplastichaveslightlytaperedthreads.
Usethreadsealonly
sparingly,otherwisetheconnectionscouldbedamaged.
Theoperatorisresponsibleforanadequatelystabilityandanappropriatefixationofthepipingaccordingto
the state of the art. To facilitate the i nstallation and maintenance shut off valves should be installed right
beforeandafterthepump.
Thenominalwidthoftheconnectionpipeshastobechoseninaccordancetothe
connectionsofthepump.Asmallerpipingcancausecavitation(suctionline)aswellasalossofperformance
(suction anddischarge line).In case thepipe istoobig,the drysuctioncapacityofthe
pumpcan decrease.
Connect the suction line to the lower connection in the center housing [4]. Seal the suction line diligently;
hosepipes should be suitably armoured. A suction line continuously rising will prevent the formation of air
locksinthelinewhichwouldaffectthesuctionlift.
Theairinlet
[23]islocatedinthemiddleofthecenterhousing[4].Whendelivereditiscoveredbyabilingual
sticker with safety instructions, which can be easily removed. Before installation, make sure that the air
supplypipeisfreeofsolids.Tosupplythepumpwithdrivingairsufficiently,thepipe
diametershouldmatch
thesizeoftheairinlet.Takecarethatnodirtorparticlescanintrudeinto thepumpduringtheconnection,as
these canaccumulate insidethe pumpand cancausemalfunctions. Anair filter [24]directly behind theair
inlet[23](notincludedinE08
andE10)preventstheentryofbulkparticles.
TheintegratedaircontrolsystemPERSWINGP
®
[26]isaprecision‐controlthatrequiresoil‐free,dryandclean
compressedairforoptimalfunction.Ifhumidityisexpected,awaterseparatororairdryerhastobefittedto
protect the pump from blocking by ice. The ideal condition is the dewpoint of air at‐20°C (‐
4°F). In humid
surroundings, icingfromtheoutsidemayoccur despite thedriving airisdried.Ifso,aprolonged waste‐air‐
exhaust (ca. 500 mm / 20 inch by pipe or hose) can be helpful. When installing the pump into boards or
cabinets, it has to be ensured that cold
air does not get caught behind the muffler. In applications with a
tendency to freezing at the waste air exhaust, good experiences in practise have been achieved by pre‐
heatingthedrivingairtoincreasethedistancetothedewpointoftheair.Doingso,ithastobe
considered
that the driving air temperature generally may not exceed 50°C (122°F) to avoid expansion and sticking
effects on the air side. This maximum air temperature is a well valid when using a compressor producing
warmairwhichise.g.oftentruefortruckcompressors.
Thepressure ofthe drivingair
should belimited tothe amountrequired tomeetthe performanceneeded.
Excessivepressureincreasesboththeairconsumptionandthewearofthepump.Thepump isregulatedby
tuning theflow rateof theair. Foraproper operationat thelower performance rangethe regulationvia a
needle valveisrecommended.Anempty pump has tobedriven slowly (e.g. viaaneedle‐valve). Thepump
starts automatically. Pumps of the E‐Series are self‐priming when dry, thus it is not necessary to fill the
suction line ofthepump. During slow operationof the pump the
drysuctionlift is better than during high
strokefrequency.Thesuctionliftcapacityofaliquid‐filledpump,however,ismuchhigher.
Thepumpisappropriateforrunningdryduringslowoperation.Dryrunningathighstrokefrequencycauses
premature wear.The pumps can briefly (uptomax.
one hour)be operated againstaclosed discharge line.
Throttling on the suction side may damage the pump. When the pump operation has been stopped by a
closed discharge, the pressure equilibrium of the diaphragms must be ensured. This can be achieved by
keeping the pump connected to the air supply
pressure; for longer stoppage, the pump must be released
fromthepressurewithinthesystemonbothfluidsideandairsupplyside.
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