A series of pieces or “rings” were Setting Innovative Standards M PUMPS PROCESS SRL Via dell’artigianato, 120 45015 Corbola (RO) – Italia Tel. Double seals provide a level of safety/zero emissions compliance not possible with single seals. 9) Install the mechanical seal in the pump: a) Place gland with stationary seal face and gasket on the pump shaft. In some pumps, even if the mechanical seal setting plates are engaged can be turned for preliminary alignment however some of them are quite difficult to turn so I suppose it is a good idea to did-engage it before any turning of the shaft is done. In order to assure you receive the correct seal for your pump, it is very important that you supply us with accurate information. Springs (single or multiple), a metal bellows or just compressed elastomers are used to provide the needed energy to keep pressing the seal faces together. (Fig.3 & 4) On both of the above set-ups, the installation of a suitable device is required to seal the fluid contained in the casing. While mechanical seals can range in price from $6,000 to $40,000, stuffing boxes range from $500 to $3,000, depending on shaft size. In some cases, we are not able to directly cross reference a seal in our cross reference to pump manufacturers. The other key aspect of a mechanical pump seal is how to maintain the seal. 4. Mechanical split seals are designed for relatively low-duty pumps used in many industries for aqueous applications where the process fluid being sealed would not be considered hazardous. • Before the advent of mechanical seals, pump users relied primarily on “rope” or braided style packing to achieve a “seal” around the shaft. b) Slide rotary unit on shaft sleeve and set the back of the rotary unit on the second scribe line as determined in step 8. 3 Fig. Where Vertical pumps. Combination of Plan 11 and Plan 13. THE FUNDAMENTALS 2 ALPHA ALPHA Fig. Increase seal chamber pressure and fluid vapor margin. Below, you will see a sequence of photos which will help us identify the seal assembly you have. A mechanical seal positioned just behind the spinning impeller on the motor shaft prevents water from entering the delicate electrical motor of the pump. The biggest advantage of split seals is that the pump motor does not need to be completely disassembled to get to the seal, reducing installation and maintenance time and labor. Expellers can also be more cost-effective than mechanical seals and, since repairing mechanical seals can cost up to 60% of the installation, price is a factor for many. Clean, non-polymerizing fluids at moderate temperatures. Set screw the rotary unit to the shaft sleeve (if seal is supplied with holding clips, remove at this time). Seal chamber heat removal. The liquid film This is essential when pumping or mixing a dangerous or toxic substance. Seal flush from pump discharge and recirculation to pump suction with orifices. Replacing these mechanical seals involves opening the pump system, removing the impeller from the pump's shaft and sliding the old seal off the shaft. Because mechanical shaft seal failures are the number one cause of pump downtime, the writer decided to dedicate this column to mechanical seal basics. Every other leak path within the mechanical seal is blocked with the use off a gasket, o-ring, wedge (Rubber, PTFE or Flexible Graphite). Double (or dual) mechanical seals are designed to ensure maximum sealing safety. +39 0426 346304 Fax + 39 0426 349126 info@mpumps.it PUMP MECHANICAL SEAL Centrifugal, Horizontal, Lined CL SEAL-M series User Manual This copy of the manual is a translation of the italian version Please let me know your thoughts. • Mechanical seals were originally designed to lend a greater sealing capability than could be achieved using common packing. Why Continuous seal chamber venting on vertical pumps. These seals virtually eliminate leakage of the fluid or gas being handled in pumps or mixers. Typically mechanical seals are installed on pumps and mixers.
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