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DRY GAS SEAL OPERATION
Presented by M. Safdar Amin
Contents
INTRODUCTION
CONSTRUCTION
WORKING
DRY
GAS SEAL SYSTEM
DRY
GAS SEAL ( DGS ) DATA
COMMON
PROBLEM
ADVANTAGES
OF DGS
CONCLUSION
Introduction
Dry gas seal is a non-contacting type mechanical seal which works on the principles of hy hydrodyn drodynamic amic forces to create and maintain maintain precisely defined gap during operation.
Seal location on Compressor Bearing
Bearing
Seal components
Seal in ‘T ‘Tandem’ andem’ Ar A r rangement
Rotating ring
Stationary ring
Stationary ring Rotating ring
Primary Seal
Secondary Seal
Working W orking of DGS Seal gas supply
Primary vent
Buffer gas supply
Compressor shaft Process side
Primary seal
Secondary seal
Secondary vent
Spiral Groove Sealing Surface Rotating Ring
shaft rotation clockwise
spiral groove Inner groove diameter
Sealing dam Opposing face inner diameter
outer diameter
Spiral Groove Operation Gas Enters And is Induced Towards the Center
Direction of Rotation
Sealing Dam
Gas is Compressed and Set Sealing Gap
Unidirectional
Bidirectional
Seal Pressure Profile FC
FC=FO
Closing Force S
FO Opening Force
P
Grooves Compression P3 Expansion
S = Spring Load P = Hydrostatic Load
Sealing Dam
Gas Film Pressure Distribution
Significant hydrodynamic effect within grooved portion Maximum pressure achieved P3 Linear pressure drop across seal dam to ID
Seal Control Systems
cooler
Original Seal Gas Supply System
Modified Seal Gas Supply System
DGS Data At Expansion Unit No .
Description
Syn Gas
Amm.
1
Arrangement Arrange ment
Tandem
Tandem
2
Design Pressure
77 Kg/cm2
4.9 Kg/cm2
3
Design Temperat emperature ure
43 0C
43 0C
4
Injection (seal) Gas from
Recycle discharge
2nd Stage
6
N2 Supply Pressure
0.2 Kg/cm2
0.2 Kg/cm2
7
Primary Vent Pressure (operating)
0.15-0.2 Kg/cm2
0.05-0.1 Kg/cm2
8
Secondary Vent Pressure (Operating)
0.22 kg/cm2
0.22 kg/cm2
9
∆P Injection gas and balancing gas (operating)
0.4 Kg/cm2
0.34 Kg/cm2
11
Injection Gas Adjustment
Bean Choke
Bean Choke
Common Problems Seal
Contamination
Elastomers
Seal Contamination Source Process Seal
Side
Gas Supply
Bearing
Lube Oil
Results Dirt Seal
hang ups
W Wear ear
of faces of
Moisture Corrosion W Wear ear
of faces of
Elastomers Limitations Temperature Pressure
Results Los Losss
of Elast Elasticity icity
Advantages Adv antages of DGS Less Space Low Maintenance Cost Less Utility Consumption Less Environmental Hazards Prohibits Prohi bits Intermixing Intermixing Of Fluids
Conclusion
Dry gas seal (DGS) (DGS) is a state of the art technolo technology gy and an efficient tool in improving plant reliability
