instrucţiune de funcţionare (2.0 MB)

english11. Frost protectionIf there is a risk of frost during prolonged periods ofnon-operation, the pump must be drained.Procedure:- Loosen the vent screw in the adapter and, ifpresent on pumps with mounting plates, remove thedraining plug in the pump casing. In the case ofvertical installation, additionally remove the manometerconnection on the flange at the bottom.CautionMake sure that the emerging medium doesnot cause injury to persons or damage tothe motor or other components. In plantswith hot media, particular care should betaken to avoid scalding.Only fit the drainage stopper again and tighten thevent screw when the pump is put back into operation.For recommissioning, see Section 9.12. Service12.1 Dirty pumpCautionIf the pump has been used for pumpinga liquid which is harmful to health or toxic,the pump is classified as being contaminated.In this case, detailed information about the pumpingmedium must be available at every request forservice.In the event of a request for service, contact must bemade and further information about pumping media,etc. must be available before despatching the pump,since otherwise acceptance of the pump may berefused. Any shipping costs incurred will be chargedto the sender.12.2 Spare parts/accessoriesWe expressly draw attention to the fact that spareparts and accessories which have not been suppliedby us also have not been checked and released by us.The installation and/or use of such products maytherefore adversely affect or impair design characteristicsof the pump.Any liability or warranty for damage resulting fromthe use of non-original spare parts and accessoriesis excluded.Faults which you cannot remedy yourself shouldonly be eliminated by authorized specialist companies.In the event of a fault, please give an exact descriptionso that our service engineers can make the necessarypreparations and provide themselves with the appropriatespares. The technical data and the ordernumber are shown on the rating plate.13. Calculatingthe minimum feed heightThe required minimum feed height «H» in [mWC]for preventing cavitation in the pump is calculated asfollows:H= p b × 10.2 - NPSH - H f - H V - H Sp b = Barometer reading in [bar](Air pressure at the pump’s location.In closed systems, pamb indicatesthe system pressure in [bar].)NPSH = Net Positive Suction Head in [mWC](See NPSH curves in the brochure)H f = Loss through frictionin the suction pipe in [mWC]H V = Vapour pressure level in [mWC],see 15.2, page 14H S = Safety supplement = 1.0 mWC.If the calculated pressure pumping height «H» ispositive, the pump can operate with a suction heightof max. «H» [mWC].If the calculated pressure pumping height «H»is negative, a feed height of min. «H» [mWC] isrequired. The calculated pumping height must beconstantly present during operation (see 5.4).Example:p b :1 barPump type:EBZ 87 V/4-269Pumping flow: 70 m 3 /hPumping height: 20.7 mWCNPSH:1.7 mWC (see brochure)H f = 2.1 mWC(depending on the plant)Medium temperature: +90 °CH V : 7.2 mWC (see 15.2)H S :1.0 mWC (assumption)H = p b × 10.2 - NPSH - H f - H V - H S [mWC].H = 1 × 10.2 - 1.7 - 2.1 - 7.2 - 1.0 = –1.8 mWCThis means that a forward-flow pumping heightof 1.8 mWC is required during operation.This is equivalent to a pressure:1.8 × 0.0981 ≅ 0.18 bar1.8 × 9.81 = 17.7 kPa24