mechanical seal
TRANSCRIPT
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Equipment
GLAND
THROAT BUSH
FOLLOWER
PACKING
LANTERN RING
SLEEEVE
PACKING WITHSLEEVE
PACKING WITHSLEEVE
*Wear is on the sleeve
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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
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Equipment
Vertical surface wear Scarifying elements
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Rotary Elements1- Carbon ring2- Snap Ring3- “O” Rings
4- Springs5- Sleeve
Stationary Element
Tungsten Carbide ring
Or Silicon Carbide ring
Equipment
Single mechanical sealSingle mechanical seal
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Double Mechanical seal Bellow typeDouble Mechanical seal Bellow type
BELLOWBELLOW
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Unbalanced mechanical seal
StationaryCarbon ring
Product + Springs
Product + Springs
Contact face pressure
Contact face pressure
>PRESSURE P STRESS S
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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
AS
Stationary ring
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P
S A1 ( projected area of P()product + spring
pressure(
)contacted surface stress( = A ( contacted surface
area(
120 cm2
230 cm2=
Mechanical seal has the following data: A = contacted surface area = 230 cm2
A1 = ( projected area of P) = 120 cm2Calculate 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
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Flushing Quenching
ATMOSPHERE
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Circulation Circulation
CYCLONE
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Heat control / removal
API Plan 21API Plan 21
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Circulating Circulating liquidliquidCirculating Circulating liquidliquid
Barrier Barrier fluidfluidBarrier Barrier fluidfluid
QuenchQuenchfluidfluidQuenchQuenchfluidfluid
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Barrier fluid Circulation
Product Circulation
Equipment
Tandem Seal
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Tandem SealTandem Seal
Barrier fluid Circulation
Product Circulation
Equipment
Pp
Barrier fluid CirculationBarrier fluid
Circulation
PBF = 1 bar max
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Barrier fluid TypeBarrier fluid Type
Temperature RangeTemperature Range Barrier fluidBarrier fluid
- 120 to - 90 Propanol - 120 to - 90 Propanol 0
C
- 90 to - 30 Methanol - 90 to - 30 Methanol 0
C
-30 to + 20 Kerosene or Hydraulic oil -30 to + 20 Kerosene or Hydraulic oil 0C
+20 to + 200 L.G.O. or H.G.O. +20 to + 200 L.G.O. or H.G.O. 0C