VARISCO M Series Instructions For Use And Maintenance Manual

VARISCO M Series Instructions For Use And Maintenance Manual Manual pdf 12 page image

Varisco S.p.A.Z.I. Nord - Terza Strada, 9 - 35129 PADOVA – ITALYTel.+39.049.8294111 Email: export@variscospa.comFax+39.049.8076762 Web: www.variscospa.com12Contact Varisco if you need to change the direction of rotation for pumps that use mechanical seal.IMPORTANT:In close coupled versions, it is necessary to check periodically that the shaft grub screw were welltightened and fits properly in the propeller shaft cavity, especially if the pump is employed in bothdirections. To this purpose, see par. 6.1.2.1 of this Manual.6.2 PIPE ASSEMBLY6.2.1 IMPORTANT PREMISE• Intake and outlet diameters must be adequate, according to viscosity and delivery involved.• Accurately clean the pipes before connecting them to the pump.• Pipes must be connected to the pump so that no external force may be applied to the pumpitself.• Fit adequate compensators between pump and pipes to protect the pump from vibrationswhich may damage the pump body.• Intake and outlet pipes shall be fitted so that, the pump is not working, there is some fluidupstream and downstream, in order to ensure that there is always enough fluid in the pumpto provide lubrication at startup.• Minimize the air intake in the body pump.Note: In case fluxed packing glands or fluxed mechanical seals or quenches were used, the feedingsystem connections and system tuning must to be carried out prior to the first startup.6.2.2 MAX ALLOWED PRESSUREUnless otherwise set out in the order confirmation, it is understood that the maximum pressureinside the pump body (i.e. with pump turning clockwise) is 6 bar per stage. The maximumallowed pressure at delivery is related its features:• flange: not exceeding nominal pressure (i.e. PN 16)• female thread: not exceeding 25 bar• sanitary male thread according to DIN 11851, up to DN 100:single and double stage pumps: not exceeding 12 barmultiple stage pumps: not exceeding 25 barOther configurations: In any case not exceeding 6 bar per stage of the stator being used.6.2.3 USEFUL ADVICEIt is advisable to fit to the pipe union a stub pipe of L length. This will allow the replacement of thestator without the need of disassembling the pump. The L value is shown in the table below,according to the size of the pump and the number of stages: