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# Mechanical seal

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Mechanical seals

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### Mechanical seal

1. 1. 1 Equipment GLAND THROAT BUSH FOLLOWER PACKING LANTERN RING SLEEEVE PACKING WITH SLEEVE PACKING WITH SLEEVE *Wear is on the sleeve
2. 2. 2 Horizontal Surface wear Shaft wear Equipment Now it essential to find a solution to avoid shaft wear, Such as finding another surface of another parts to be worn but easy and cheap to be replaced, It is the MECHANICAL SEAL
3. 3. 3 Equipment Vertical surface wear Scarifying elements
4. 4. 4 Rotary Elements 1-Carbon ring 2-Snap Ring 3-“O” Rings 4-Springs 5-Sleeve Stationary Element Tungsten Carbide ring Or Silicon Carbide ring Equipment Single mechanical sealSingle mechanical seal
5. 5. 5 Double Mechanical seal Bellow typeDouble Mechanical seal Bellow type BELLOWBELLOW
6. 6. 6 Unbalanced mechanical seal StationaryCarbon ring Product + Springs Product + Springs Contact face pressure Contact face pressure >PRESSURE P STRESS S
7. 7. 7 FACE AND SEAT AREA EQUAL 100% BALANCEFACE AND SEAT AREA EQUAL 100% BALANCE F = P * A F = S * A P * A = S * A P = S A = Contacted Surface area S = Contacted Surface stress P = Product+ Spring pressure F = Acting force S P = 100% AP Carbon ring A S Stationary ring
8. 8. 8 P S A1 ( projected area of P()product + spring pressure( )contacted surface stress( = A ( contacted surface area( 120cm2 230cm2 = Mechanical seal has the following data: A = contacted surface area = 230 cm2 A1 = ( projected area of P) = 120 cm2 Calculate the hydraulic balance Percentage SOLUTION =.0 52*100= 52% Hydraulic balance % is less than 65% This Mechanical is prone to leak Hydraulic balance % is less than 65% This Mechanical is prone to leak
9. 9. 9 Flushing Quenching ATMOSPHERE
10. 10. 10 CirculationCirculation CYCLONE
11. 11. 11 Heat control / removal API Plan 21API Plan 21
12. 12. 12 CirculatingCirculating liquidliquid CirculatingCirculating liquidliquid BarrierBarrier fluidfluid BarrierBarrier fluidfluid QuenchQuench fluidfluid QuenchQuench fluidfluid
13. 13. 13 Barrier fluid Circulation Product Circulation Equipment Tandem Seal
14. 14. 14 Tandem SealTandem Seal Barrier fluid Circulation Product Circulation Equipment Pp Barrier fluid Circulation Barrier fluid Circulation PBF = 1 bar max
15. 15. 15 Barrier fluid TypeBarrier fluid Type Temperature RangeTemperature Range Barrier fluidBarrier fluid -120to - 90 Propanol -120to - 90 Propanol 0 C -90to - 30 Methanol -90to - 30 Methanol 0 C -30to + 20 Kerosene or Hydraulic oil -30to + 20 Kerosene or Hydraulic oil 0 C +20to + 200 L.G.O. or H.G.O. +20to + 200 L.G.O. or H.G.O. 0 C