GT Pressure Tanks
GRUNDFOS DATA BOOKLETGT pressure tanksFor cold-water and heating applications
GT pressure tanksTable of contents1.2.Product data3Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Volume range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Product range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Approvals and markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Type key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .333333Construction4Material specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Tank colour . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43.4.Operating conditions5Cold water6Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Tank range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Selection of cold water tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7GT-U, 10 bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8GT-U, 16 bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9GT-U, 25 bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10GT-U , 10 bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11GT-U , 16 bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12GT-U , 25 bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13GT-H, 10 bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14GT-H, 16 bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15GT-H, 10 bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16GT-D, 10 bar, GT-DF, 8.6 bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17GT-C, GT-CF, 8.6 bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185.6.2Heating19Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tank range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Selection of a GT-HR tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .GT-HR, 6 bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19191920Grundfos Product Center21
GT pressure tanks1ApplicationsProduct rangeThe Grundfos GT pressure tanks are long-life tanksideally suited for controlling the pressure in domestic,commercial as well as industrial applications in thefollowing systems: cold-water (drinking-water) systems. SeeApplications, page 6. heating systems. See Heating, page 19.Grundfos GT tanks ensure long, maintenance-free,reliable and controlled operation.GT tanks can be integrated in many different systemswith a wide variety of pumps. The large number of tanksizes and types available makes it possible to selectthe pressure tank that best suits the application andsystem in question.The table below shows the available tank types inrelation to application.Intended useGrundfos tanks can be used both indoors and outdoorsas they are rated C2 corrosivity category according toISO 12944.ISO 12944 distinguishes six corrosivity categories foratmospheric environments:CorrosivitycategoryEnvironment examples according to ISO 12944OutdoorsIndoorsC1-Heated buildings with aclean atmosphere such asoffices, shops, schools,hotels.C2Atmospherecontaminated to a smallextent, mainly ruralregions.Buildings which are notheated, wherecondensation may occure.g. storehouses, sportshalls.C3Production space of highIndustrial and urbanhumidity and certain airatmosphere with ancontamination e.g.average sulphur oxidefoodstuff plants, laundries,(IV) contamination level.breweries, dairies.C4Inshore areas of lowsalinity.Chemical plants, swimmingpools, ship repair yards.C5Buildings and areas ofIndustrial areas andalmost constantinshore areas of mediumcondensation and highsalinity.contamination.C5Inshore areas andoffshore areas of highsalinity.Buildings and areas ofalmost constantcondensation and highcontamination.SymbolProduct data1. Product dataDescription -RecommendedApplicableNot recommendedTank typeApplicationGT-UGT-U HeatingChilled waterSea waterGrey waterDrinking water GT-HGT-D GT-DFGT-CGT-CFGT-HR - For chilled water, a glycol-water mixture with amaximum of 50 % glycol is permissible for freezeprotection.Grey water, also known as sullage, is non-industrialwastewater generated from domestic processes, suchas dish washing, laundry and bathing.Approvals and markingsApprovalsTank typeMarkingsWRASNSFACSCEEAC -- - GT-UGT-U GT-HGT-DGT-DFGT-CGT-CFGT-HRComplianceUBA METALLETank typeGT-U, GT-U , GT-H, GT-D, GT-DF, GT-C, GT-CFGT-HR -Type keyCodeExampleGT-U- 25PN 10G 1/2VType rangeTank typeVolume rangeApplicationCold waterHeatingPositionVolume range[l]VerticalHorizontalVertical8 to 500020 to 1008 to 3000UU HDDFCCFHRVHBladderBladderDiaphragmDouble diaphragmDouble diaphragm withFlowThruComposite tankComposite tank with FlowThruNon-replaceable diaphragm forheating applicationsTank volume [litres]Pressure ratingPipe connectionPositionVerticalHorizontal3
GT pressure tanks2Construction2. ConstructionGT-U, GT-U GT-H, GTDGT-HR467141256335Fig. 1TM03 8262 0907 - TM02 9095 0907 - TM03 1677 27052Sectional drawings, examples of tanks. The actual GT tank may look different from the examples shown above.Material specificationsPos.Component1Tank body2Bladder, diaphragmMaterial3Flange/pipe connection4Air valve5Clamping ring/feet6Lifting eye/skirt7Tapped holeGT-U, GT-U , GT-H, GT-D, GT-DF, GT-HRFibreglass, epoxy resin, compositeGT-C, GT-CFButylGT-U, GT-H, GT-D, GT-DF, GT-C, GT-CFEPDMGT-U SBR rubberGT-HRStainless steel EN 1.4301/AISI 304GT-H, GT-D, GT-DFStainless steel EN 1.4401/AISI 316 TiGT-U, GT-U Polyvinyl chloride (PVC)GT-C, GT-CFLow-carbon sheet steelGT-HRSteel/brassGT-U, GT-U , GT-H, GT-D, GT-DF, GT-C, GT-CF, GT-HRLow-carbon sheet steelGT-U, GT-U , GT-H, GT-D, GT-DF, GT-HRPolypropylene (PP)GT-C, GT-CFLow-carbon sheet steelGT-U, GT-U , GT-H, GT-D, GT-DF, GT-HRPolypropylene (PP)GT-C, GT-CFLow-carbon sheet steelGT-U, GT-U Tank colourTank typeGT-UGT-U GT-HGT-DGT-DFGT-HRGT-CGT-CF4Tank typeLow-carbon sheet steelColourColour codeGreyNCS S7005-R80B, gloss 20-35Grey-
GT pressure tanks3Operating conditions3. Operating conditionsGT-U bladder tank25 barGT-U bladder tankGT-U bladder tankMaximum operating pressure16 barGT-U bladder tankGT-H diaphragm tankGT-U bladder tankGT-U bladder tank10 barGT-D double-diaphragm tankGT-H diaphragm tankGT-DF double-diaphragm tank with FlowThru8.6 bar GT-CF composite tank with FlowThruGT-C composite tank6 barGT-HR heating tank (5 to 1000 litres)10 C20 C30 C40 C50 C60 C70 C80 C90 C100 CMaximum liquid temperature5
GT pressure tanks4Cold water4. Cold waterApplicationsThe Grundfos GT pressure tanks for cold-waterapplications are long-life tanks ideally suited forcontrolling the pressure in domestic, commercial aswell as industrial applications.Typical applications: domestic water supply systems booster systems irrigation systems industrial systems.GT tanks can be integrated in many different systemswith a wide variety of pumps. The large number of tanksizes and types available makes it possible to selectthe pressure tank that best suits the application andsystem in question.Tank rangeGT-U, bladder tankThe pressure tank body is made of steel and is factoryprecharged with nitrogen. All parts in contact withwater are either made of stainless steel or coated forprotection against corrosion.The replaceable bladder for tanks with a volumeexceeding 60 litres is made of high-quality rubbermaterial suitable for potable-water and grey-waterapplications, such as booster systems, pressurisationand water hammer arresting.GT-U , bladder tankGT-U has a built-in pressure gauge placed on thetank body.You can install a pressure switch by the air valve ontop of the tank in order to start and stop the pump.The pressure tank body is made of steel.The replaceable bladder is suitable for potable-waterand grey-water applications where high-pressureratings are required, such as booster systems, heatingexpansion, pressurisation and water-hammerarresting.GT-D, double-diaphragm tankThe diaphragm is a chlorine-resistant 100 % butyldiaphragm with a precision-moulded copolymerpolypropylene liner for superior air and waterseparation.The diaphragm assembly is clenched together with apositive lock internal clench ring which containsdrawdown water in a precharged air atmosphere, thusproviding separation between the diaphragm and tankwall. This air buffer means less problems withcondensation. The air chamber is sealed with a fixedO-ring and closed cell foam.GT-DF, double-diaphragm tank with FlowThruThe GT-CF pressure tank has a steel body and thesame double diaphragm as the CT-D tank.The FlowThru connection diverts system water intoand more importantly out of the tank while the pump isrunning. This constant flushing ensures that the waterin the tank remains fresh and eliminates the risk ofstagnant water during normal system operation. Seefig 2.GT-C, composite tankThe GT-C pressure tank is a lightweight pressure tank.The diaphragm is a chlorine-resistant 100 % butyldiaphragm with a precision-moulded copolymerpolypropylene liner for superior air and waterseparation. This design allows each tank size to havea properly sized water chamber matched to thedrawdown performance of that tank. A steel clench ringregulates movement and prevents the diaphragm fromrubbing against the tank wall.GT-CF, composite tank with FlowThruThe GT-CF lightweight pressure tank has the samediaphragm as the CT-C tank. The FlowThru connectiondiverts system water into and more importantly out ofthe tank while the pump is running. This constantflushing ensures that the water in the tank remainsfresh and eliminates the risk of stagnant water duringnormal system operation. See fig 2.GT-H, diaphragm tankTM04 5524 3309The polypropylene liner combined with an FDAapproved high-grade butyl diaphragm makes up thewater chamber. This is held against the tank wall with asteel clench ring.The brass air valve, sealed by a threaded O-ring valvecap, prevents air leaks.Fig. 26Illustration of the FlowThru function
GT pressure tanksSelection of cold water tankTank sizes exceeding 450 litresTank sizes not exceeding 450 litresCalculate tank sizes exceeding 450 litres with theformula below.For tank sizes not exceeding 450 litres, use thediagram in fig 4 to select the optimum tank size. All youneed to know is the cut-in pressure and the flow rate.The diagram below is based on the following values: differential pressure: 1 bar number of starts and stops per hour: 20 constant for tank precharge pressure: 0.9.V0 V0:VL:Vv:Qs:p1:p2:p0:QP:QT:N:Cold water41000 x Q s x (p1 1) x (p2 1)4 x N x (p 0 1) x (p2 - p1)Tank volume [litres]Air volume in tank [litres]Water volume in tank [litres]Mean flow rate [m3/h]Cut-in pressure [bar]Cut-out pressure [bar]Precharge pressure, tank [bar]Flow rate, pump [m3/h]Flow rate, pressure tank [m3/h]Maximum number of starts/stops per hourVVQTQpFig. 3p[bar]4.58l12 l18 l24 l33 l60 l80 lQsTM04 5567 3409VLCalculation of the tank volume100 l 130 l 170 l240 l 300 l450 lCut-in pressure4.03.53.02.52.01.50.080 0.10.150.20.30.4 0.5 0.60.811.523456810 12Q [m³/h]2Fig. 434567 8 9 1020304050 60 70 80 100Q [l/min]TM02 8938 24051.0Tank size in relation to the cut-in pressure and flow rate. For tank sizes not exceeding 450 litres.7
GT pressure tanks4Cold waterGT-U, 10 barVertical installation.Maximum pressure: 10 bar.Precharge pressure: 4 bar.Dimensions, weights and product numbers12 to 33 litres60 to 800 litres1000 to 4000 litresDDHTM03 1681 2809 - TM03 8257 2809 - TM03 8258 0518HHCH1DH1CCFig. 5Dimensional sketchesTank typeGT-U-12 PN 10 G 3/4 VGT-U-25 PN 10 G 3/4 VGT-U-33 PN 10 G 3/4 VGT-U-60 PN 10 G 1 VGT-U-80 PN 10 G 1 VGT-U-100 PN 10 G 1 VGT-U-200 PN 10 G 1 1/4 VGT-U-300 PN 10 G 1 1/4 VGT-U-400 PN 10 G 1 1/4 VGT-U-500 PN 10 G 1 1/4 VGT-U-600 PN 10 G 1 1/2 VGT-U-800 PN 10 G 1 1/2 VGT-U-1000 PN 10 G 1 1/2 VGT-U-1500 PN 10 DN 65 VGT-U-2000 PN 10 DN 65 VGT-U-3000 PN 10 DN 65 VGT-U-4000 PN 10 DN 65 80010001500200030004000Gross weight[kg]DHH1CStainlesssteel 33263263263286291320320G 3/4G 3/4G 3/4G1G1G1G 1 1/4G 1 1/4G 1 1/4G 1 1/4G 1 1/2G 1 1/2G 1 1/2DN 65DN 65DN 65DN 6120025853571010501140Product numberReplaceablebladder Stainlesssteel flangeCoated 657328596603454Note: For some GT-U tanks, the bladder is available as a spare part. The part number can be found on Grundfos.com (GPC).8
GT pressure tanks4Cold waterGT-U, 16 barVertical installation.Maximum pressure: 16 bar.Precharge pressure: 4 bar.Dimensions, weights and product numbers12 to 25 litres80 to 800 litres1000 to 5000 litresDDHTM03 1681 2809 - TM03 8257 2809 - TM03 8258 0518HHCH1DH1CCFig. 6Dimensional sketchesTank typeGT-U-12 PN 16 G 3/4 VGT-U-25 PN 16 G 3/4 VGT-U-80 PN 16 G 1 VGT-U-100 PN 16 G 1 VGT-U-200 PN 16 G 1 1/4 VGT-U-300 PN 16 G 1 1/4 VGT-U-400 PN 16 G 1 1/2 VGT-U-500 PN 16 G 1 1/2 VGT-U-600 PN 16 G 1 1/2 VGT-U-800 PN 16 G 1 1/2 VGT-U-1000 PN 16 G 1 1/2 VGT-U-1500 PN 16 DN 65 VGT-U-2000 PN 16 DN 65 VGT-U-3000 PN 16 DN 65 VGT-U-4000 PN 16 DN 65 VGT-U-5000 PN 16 DN 65 00015002000300040005000Gross weight[kg]DHH1CStainlesssteel 5265265291291320320320G 3/4G 3/4G1G1G 1 1/4G 1 1/4G 1 1/2G 1 1/2G 1 1/2G 1 1/2G 1 1/2DN 65DN 65DN 65DN 65DN 23264694904124913641616Product numberReplaceablebladderStainlesssteel 4319660343296603433 Note: For some GT-U tanks, the bladder is available as a spare part. The part number can be found on Grundfos.com (GPC).9
GT pressure tanks4Cold waterGT-U, 25 barVertical installation.Maximum pressure: 25 bar.Precharge pressure: 4 bar.Dimensions, weights and product numbers8 litres80 to 800 litres1000 litresDDDDHTM03 1681 2809 - TM03 8257 2809 - TM03 8258 0518HHHCCH1DDH1CCCCFig. 7Dimensional sketchesTank typeGT-U-8 PN 25 G 3/4 VGT-U-80 PN 25 DN 50 VGT-U-120 PN 25 DN 50 VGT-U-180 PN 25 DN 50 VGT-U-300 PN 25 DN 50 VGT-U-400 PN 25 DN 50 VGT-U-600 PN 25 DN 50 VGT-U-800 PN 25 DN 50 VGT-U-1000 PN 25 DN 50 duct numberGross weight 160159159159G 3/4DN 50DN 50DN 50DN 50DN 50DN 50DN 50DN 508107142179201302404150559 Stainlesssteel flangeCoated 03465966034669660346896603469Note: For some GT-U tanks, the bladder is available as a spare part. The part number can be found on Grundfos.com (GPC).10
GT pressure tanks4Cold waterGT-U , 10 barVertical installation.Maximum pressure: 10 bar.Precharge pressure: 4 bar.Dimensions, weights and product numbers100 to 3000 litresH1TM07 0604 0418HDCFig. 8Dimensional sketchTank typeGT-U GT-U GT-U GT-U GT-U GT-U GT-U GT-U GT-U GT-U 100 PN 10150 PN 10200 PN 10300 PN 10500 PN 10750 PN 101000 PN 101500 PN 102000 PN 103000 PN 280270270250Gross weight[kg]ReplaceablebladderProduct 92.0 1/41/422221/2Note: For some GT-U tanks, the bladder is available as a spare part. The part number can be found on Grundfos.com (GPC).11
GT pressure tanks4Cold waterGT-U , 16 barVertical installation.Maximum pressure: 16 bar.Precharge pressure: 4 bar.Dimensions, weights and product numbers100 to 3000 litresH1H1TM07 0604 0418HHD DC CFig. 9Dimensional sketchTank typeGT-U GT-U GT-U GT-U GT-U GT-U GT-U GT-U GT-U GT-U 100 PN 16150 PN 16200 PN 16300 PN 16500 PN 16750 PN 161000 PN 161500 PN 162000 PN 163000 PN 280270270250Gross weight[kg]ReplaceablebladderProduct 055.0 1/41/422221/2Note: For some GT-U tanks, the bladder is available as a spare part. The part number can be found on Grundfos.com (GPC).12
GT pressure tanks4Cold waterGT-U , 25 barVertical installation.Maximum pressure: 25 bar.Precharge pressure: 4 bar.Dimensions, weights and product numbers100 to 3000 litresH1TM07 0604 0418HDCFig. 10 Dimensional sketchTank typeGT-U GT-U GT-U GT-U GT-U
and more importantly out of the tank while the pump is running. This constant flushing ensures that the water in the tank remains fresh and eliminates the risk of stagnant water during normal system operation. See fig 2. GT-C, composite tank The GT-C pressure tank is a lightweight pressure tank. The diaphragm is a chlorine-resistant 100 % butyl
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