Mechanical seal
-
Upload
ramin-safikhani -
Category
Engineering
-
view
386 -
download
12
Transcript of Mechanical seal
1
Equipment
GLAND
THROAT BUSH
FOLLOWER
PACKING
LANTERN RING
SLEEEVE
PACKING WITHSLEEVE
PACKING WITHSLEEVE
*Wear is on the sleeve
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
Equipment
Vertical surface wear Scarifying elements
4
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
5
Double Mechanical seal Bellow typeDouble Mechanical seal Bellow type
BELLOWBELLOW
6
Unbalanced mechanical seal
StationaryCarbon ring
Product + Springs
Product + Springs
Contact face pressure
Contact face pressure
>PRESSURE P STRESS S
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
AS
Stationary ring
8
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
9
Flushing Quenching
ATMOSPHERE
10
Circulation Circulation
CYCLONE
11
Heat control / removal
API Plan 21API Plan 21
12
Circulating Circulating liquidliquidCirculating Circulating liquidliquid
Barrier Barrier fluidfluidBarrier Barrier fluidfluid
QuenchQuenchfluidfluidQuenchQuenchfluidfluid
13
Barrier fluid Circulation
Product Circulation
Equipment
Tandem Seal
14
Tandem SealTandem Seal
Barrier fluid Circulation
Product Circulation
Equipment
Pp
Barrier fluid CirculationBarrier fluid
Circulation
PBF = 1 bar max
15
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