VARISCO M Series Instructions For Use And Maintenance Manual

VARISCO M Series Instructions For Use And Maintenance Manual Manual pdf 17 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.com179 X X X Air leakage at intake10 X X X X Difficult intake11 X X X X Air intake from seal or packing12 X X X X Too Low speed13 X X X X Wrong direction of rotation14 X X X Available NPSH below required15 X X X X X X The pump is working dry16 X X X The stator is faulty – burned-over17 X X X X X Spoilt stator. Check rubber18 X X X X X Faulty rotor19 X X X X Faulty connecting rod20 X X The pump is not aligned to the elastic joint21 X X Broken connecting rod22 X X Spoilt bearings23 X X X Too high speed24 X X X X X Excessive viscosity25 X X X X X X X The gland needs to be adjusted26 X X X Inadequate sealing systemReference for malfunctioning removal:1) Fill the pump with suitable product, gliceryn or soap (DO NOT USE any kind of oil if an EPDM rubber stator isused).2) Check on the order for details concerning electric connections and compare.3) Measure pressure with a manometer and compare that with the order.4) Remove unknown material and replace damaged parts.5) If the temperature can not be lowered, install a downsized rotor.6) Check if the fluid corresponds to the order, change stator rubber.7) Increase the liquid percentage. Install a grid at intake.8) Clean the pump and repeat the operation after each single use.9) Increase the level of liquid at intake to prevent air intake.10) Check seals and carefully tighten the pipes unions.11) Tighten or replace the gland. If a mechanical seal is used, carefully clean and replace it if necessary.12) Increase rpm.13) Modify electric connections.14) Increase the pressure at the inlet lowering the pump position and lower the inlet fluid temperature.15) Fill the pump, install a device preventing dry working.16) Replace the stator.17) Replace the stator, check if the fluid corresponds to the order and if necessary change stator rubber.18) Replace the rotor and try to identify the cause, which may be abrasion, corrosion or cavitation.19) Replace worn parts.20) Re-align pump and elastic joint.21) Replace broken part and re-align.22) Replace bearings, lubricate and tight.23) Lower rpm through variator.24) Check viscosity and compare it with the order.25) Check specific weight and compare it with the order.26) Choose a different mechanical seal or packing.Note: For any query, please contact Nova Rotors or our local agent.9 DISASSEMBLY AND ASSEMBLY OF COMPONENTSPREMISE1. Comply with the safety measures set out in Chapter 2 of this Manual.2. The pump and its piping shall be emptied and cooled.9.1 DISASSEMBLY OF ROTOR-STATOR1. Disconnect the pump from intake and delivery pipes.2. Support the pump body (01) with wooden blocks (02) under the stator (03).