Dry Gas Seals Type 28
6
■ Temperature: -140°C to 315°C/-220°F to 600°F ■ Pressure: Up to 450 BARG/6,500 PSIG across single stage ■ Speed: Up to 200 m/s / 660 fps ■ Shaft: Up to 330 mm/13 in. Performance Capabilities Design Features ■ Shrouded mating ring prevents secondary damage in the event of a mating ring fracture. ■ Low-level leakage can be vented to a safe area, used as fuel to drive equipment, or returned to process via a low-pressure ejector. 28AT/28XP/28EXP Product Description Type 28 compressor dry-running gas seals have been the industry standard since early 1970 for gas-handling turbomachinery. Utilizing John Crane's patented spiral groove pattern, these seals are non-contacting in operation. ■ During dynamic operation, the mating ring/seat and primary ring/face maintain a sealing gap of approximately 0.0002 in./5 microns, thereby eliminating wear. ■ These seals eliminate seal oil contamination and reduce maintenance costs and downtime. ■ Single, double opposed, and tandem cartridge seals are capable of handling a wide variety of gas sealing applications in the gas collection/transmission, refining, chemical and petrochemical processing industries. TYPE 28 Compressor Seals Dry-Running, Non-Contacting Gas Seals Optional Bidirectional Groove Design Standard Unidirectional Groove Design *Contact [email protected] for more information about exact application requirements.
description
John Crane
Transcript of Dry Gas Seals Type 28
■ Temperature: -140°C to 315°C/-220°F to 600°F■ Pressure: Up to 450 BARG/6,500 PSIG across
single stage■ Speed: Up to 200 m/s / 660 fps■ Shaft: Up to 330 mm/13 in.
Performance Capabi l i t ies
Design Features■ Shrouded mating ring prevents secondary damage in
the event of a mating ring fracture.■ Low-level leakage can be vented to a safe area, used as
fuel to drive equipment, or returned to process via alow-pressure ejector.
28AT/
28X
P/2
8EX
P
Product Descript ionType 28 compressor dry-running gas seals have been theindustry standard since early 1970 for gas-handling turbomachinery. Utilizing John Crane's patented spiralgroove pattern, these seals are non-contacting in operation.■ During dynamic operation, the mating ring/seat and
primary ring/face maintain a sealing gap of approximately0.0002 in./5 microns, thereby eliminating wear.
■ These seals eliminate seal oil contamination and reducemaintenance costs and downtime.
■ Single, double opposed, and tandem cartridge seals arecapable of handling a wide variety of gas sealingapplications in the gas collection/transmission, refining,chemical and petrochemical processing industries.
TYPE 28 Compressor SealsDry-Running, Non-Contacting Gas Seals
Optional Bidirectional Groove DesignStandard Unidirectional Groove Design
*Contact [email protected] for more information about exact application requirements.
Type
28A
T Ta
ndem
Arr
ange
men
t
Inle
t for
Filt
ered
Proc
ess
Gas
Outle
t for
1st
STA
GELe
akag
e an
dSe
para
tion
Gas
Outle
t for
2nd
STA
GELe
akag
e an
dBa
rrie
r Gas
Barr
ier G
asSu
pply
1st S
TAGE
2nd
STAG
E
MAT
ING
RING
MAT
ING
RING
PRIM
ARY
RING
PRIM
ARY
RING
BEAR
ING
CAVI
TYPR
OCES
SGA
S
Inle
t for
Sep
arat
ion
Gas
(Opt
iona
l)
O-Ri
ng S
econ
dary
Sea
l
*Typ
ical
App
licat
ion
pres
sure
s up
to 1
,800
PSI
G/12
5 BA
RG
Proc
ess
Gas
Laby
rinth
Inte
rsta
ge L
abyr
inth
Type
82
Barr
ier S
eal
28AT/28XP/28EXPTY
PE
28
AT
Com
pres
sor
Sea
lsD
ry-R
unnin
g,
Non-C
onta
cting G
as S
eals
1st S
TAGE
2nd
STAG
E
MAT
ING
RING
MAT
ING
RING
PRIM
ARY
RING
PRIM
ARY
RING
BEAR
ING
CAVI
TY
Inle
t for
Filt
ered
Proc
ess
Gas
Outle
t for
1st
STA
GELe
akag
e an
dSe
para
tion
Gas
Outle
t for
2nd
STA
GELe
akag
e an
dBa
rrie
r Gas
Barr
ier G
asSu
pply
Inle
t for
Sep
arat
ion
Gas
(Opt
iona
l)
PROC
ESS
GAS
Proc
ess
Gas
Laby
rinth
Inte
rsta
ge L
abyr
inth
Poly
mer
Sec
onda
ry S
eal
*Typ
ical
App
licat
ion
pres
sure
s up
to 3
,000
PSI
G/20
0 BA
RG
Type
82
Barr
ier S
eal
Type
28X
P Ta
ndem
Arr
ange
men
t
28AT/28XP/28EXPTY
PE
28
XP C
ompr
esso
r Sea
lsD
ry-R
unnin
g,
Non-C
onta
cting G
as S
eals
Type
28E
XP T
ande
m A
rran
gem
ent
BEAR
ING
CAVI
TYPR
OCES
SGA
S
1st S
TAGE
2nd
STAG
E
MAT
ING
RING
MAT
ING
RING
PRIM
ARY
RING
PRIM
ARY
RING
Inle
t for
Filt
ered
Proc
ess
Gas
Outle
t for
1st
STA
GELe
akag
e an
dSe
para
tion
Gas
Outle
t for
2nd
STA
GELe
akag
e an
dBa
rrie
r Gas
Barr
ier G
asSu
pply
Inle
t for
Sep
arat
ion
Gas
(Opt
iona
l)
Proc
ess
Gas
Laby
rinth
Inte
rsta
ge L
abyr
inth
Adva
nced
Pol
ymer
Sec
onda
ry S
eal
Type
82
Barr
ier S
eal
*Typ
ical
App
licat
ion
pres
sure
s up
to 6
,500
PSI
G/45
0 BA
RG
28AT/28XP/28EXPTY
PE
28
EXP C
ompr
esso
r Sea
lsD
ry-R
unnin
g,
Non-C
onta
cting G
as S
eals
5
4
3
2
1
0
Pow
er (K
W)
6.0
5.0
4.0
3.0
2.0
1.0
02.187 3.187 4.187 5.187 6.125 7.125 8.125 9.125 10.125
50 100 150 200 250
Seal Size
Pow
er (H
P)
(inches)
(mm)
Conditions: Air, 140°F/60°C
10,000 rpm; 69 BARG/1,000 PSIG
10,000 rpm; 7 BARG/100 PSIG
5,000 rpm; 7 BARG/100 PSIG
5
4
3
2
1
0
Leak
age
(SCF
M)
125
100
75
50
25
02.187 3.187 4.187 5.187 6.125 7.125 8.125 9.125 10.125
50 100 150 200 250
Seal Size
Leak
age
(sl/m
in)
(inches)
(mm)
Conditions: Air, 83 BARG/1,200 PSIG
5,000 rpm
10,000 rpm15,000 rpm
5
4
3
2
1
0
Leak
age
(SCF
M)
125
100
75
50
25
0
0 200 400 600 800 1,000 1,200
80
Pressure
Leak
age
(sl/m
in)
(PSIG)
(BARG)
Conditions: 6.187-inch Diameter Seal, 14,000 rpm
0 20 40 60
Hydrogen, 38°C/100°FMethane, 38°C/100°FAir, 38°C/100°FAir, 150°C/300°F
TYPE 28 Compressor SealsDry-Running, Non-Contacting Gas Seals
Size and Speed E f fect on Leakage
Pressure, Temperature and Gas E f fect on Leakage
Gas Seal Power Consumpt ion
*This information should not be used for specification purposes. Contact [email protected] for more information about exact application requirements.
TYPE 28 Compressor SealsDry-Running, Non-Contacting Gas Seals
Typica l S ing le Seal Arrangement and Seal Support System
Typica l Double Opposed Seal Arrangement and Seal Support System
Typica l Tandem Seal Arrangement and Seal Support System
*Single Seal Arrangement for applications not requiring a safety back-up seal.
*Tandem Seal Arrangement for applications requiring a safety back-up seal.
For your nearest John Crane facility, please contact one of the locations above.
If the products featured will be used in a potentially dangerous and/or hazardous process, your John Crane representative should be consulted prior to their selection and use. In the interest of continuous development, John Crane Companies reserve the right to alter designs and specifications without prior notice. It is dangerous to smoke while handling products made from PTFE. Old and new PTFE products must not be incinerated.
©2002 John Crane Inc. Print 2/02 www.johncrane.com ISO-Certified QS 9000 S-28AT/28XP/28EXP
*For more information contact [email protected]
EuropeSlough, UK
Tel: 44-1753-224000Fax: 44-1753-224224
North AmericaMorton Grove, Illinois USA
1-800-SEALINGTel: 1-847-967-2400Fax: 1-847-967-3915
Latin AmericaSão Paulo, Brazil
Tel: 55-11-3371-2500Fax: 55-11-3371-2599
Middle East, Africa, AsiaDubai, United Arab Emirates
Tel: 971-4-3438940Fax: 971-4-3438970
VENTVENT
JOHN CRANE GAS SEALS
VENTVENT
JOHN CRANE GAS SEALS
EXTERNAL SUPPLY
APPROVED VENTVENT
JOHN CRANE GAS SEALS
APPROVED VENT VENT
*Double Seal Arrangement where hazardous gas is not permissible to leak into atmosphere.
