ALPHASEAL catalog

SEALING TECHNOLOGIES
FOR THE OIL&GAS INDUSTRY
Since 1971 PRP offers SEALING SOLUTIONS for a large variety of applications:
- OIL & GAS
- Energy
- Food & Beverage
- Chemical
- Marine
- Hydraulic
- Automotive
- Tool Machines
- Nuclear
- Costruction & Agricaltural Equipment
The PRP Technical Department offers support (CAD drawings, FEA, laboratory testing) to recommend
and design the suitable seal even for the most challenging working conditions.
The quality of PRP products leads to the longest seal working life and largest saving in terms of machine
downtime and productivity.
PRP is also well-know for the service to the customer
and for the quick reaction time.
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ALPHASEAL for OIL&GAS
Several years ago PRP started developing the αSEAL product range to satisfy the demanding requirements
of customers active in the OIL & GAS business, in particular producers of Trunnion Mounted Ball Valves.
The harsh working conditions, the increasing pressure levels and the request of certified material made
PRP the leading provider of sealing solutions for Sub Sea and Top Side valves as per ANSI, API 6A, and API
6D standards.
The αSEAL LIPRING is available with a variety of profiles and components to withstand high sour gas (H2S)
concentrations.
BALL VALVES - GATE VALVES - VALVE ACTUATORS
- αSEAL LIPRING for Valve SPE and DPE Seats.
- αSEAL LIPRING and V-PACK for Stem seals (Low Fugitive Emissions).
- αSEAL LIPRING for Body and Cover seals.
- αSEALC-Rings.
- αSEALO-Ring in different elastomeric compounds.
- αSEAL Graphite Packing for Valve Seat and Stem.
- αSEAL Thermosetting Guide Rings for Actuators.
ANY SEAL SIZE
FROM CRYOGENIC (-196°C) TO VERY HIGH TEMPERATURE
PRESSURE UP TO 15000 psi
NORSOK M710 AND M630 APPROVED MATERIALS
NACE MR-01-75 SPRINGS
ANTI-EXPLOSIVE DECOMPRESSION O-RINGS
LOW TEMPERATURE O-RINGS
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LIPRING in ball valves
STEM/FLANGE
HG
PKA
BODY/COVER - RADIAL or FACE
HG
SPE and DPE SEAT
UD
DI 3
FA4
OTHER ALPHASEAL APPLICATIONS IN OIL&GAS
• SWIVELS
• LOADING ARMS
• MOORING BUOYS
• LOADING TURRETS
• CHRISTMAS TREES
• MUD PUMPS
• COMPRESSORS
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What is a LIPRING and how does it work
The LIPRING consists of a polymeric jacket which is energized by a metallic spring when installed into a
groove. It offers many of the well-known advantages of the common elastomeric O-rings while avoiding
many of its limitations. The resilient spring element responds with constant force, pushing out the sealing
lips, creating a tight seal against the groove mating surfaces.
The open end of the jacket is orientated towards the highest pressure side and allows the hydrostatic
pressure to energize the seal and supplement the spring force which increases contact pressure and
eliminates potential leakage.
The use of a resilient spring element ensures positive sealing even at low-pressure and compensates for
jacket wall reduction from cold flow, wear and thermal contraction. In conditions that see thermal cycling,
the spring system continues to energize the seal lips without taking a compression set or becoming too soft
or hard. Many different spring designs are available in corrosion resistant metal alloys including stainless
steel, cobalt chromium - nickel alloy, Inconel® and Hastelloy®.
Jacket profiles are typically made from PTFE based
and other high-performance polymer plastics, often
with special additives to enhance, for example,
wear resistance or high-temperature strenght. PTFE
offers excellent inherent low friction characteristics
and an outstanding high degree of chemical
inertness. Additionally, polymers are less prone to
some of the problems associated with elastomeric
seals including explosive decompression and stickslip. LIPRINGS are precision lathe-turned parts.
Although PRP offers selected sizes to fit many
popular international O-ring cavities, the fact is that
the LIPRING system can be tailored to any existing
customer groove geometry.
Selecting the LIPRING size for your application
Standard LIPRINGS are available in any diameter from 2.5 mm up to 3000 mm and a variety of
cross-sections to fit the various groove sizes you may have.
Please refer to the page of the LIPRING type selected for your application to determine the appropriate
diameter, cross-section and housing dimensions.
Jacket material
PRP draws on hundreds of PTFE compounds and other polymeric materials to manufacture the LIPRING
jacket profile. Our material range includes unfilled PTFE, standard and speciality filled PTFE compounds,
TFM blends, UHMW polyethylene, thermoplastics, PEEK, polymide, ecc.
PRP can meet your material requirements for polymer sealing in most environmental and operating
conditions.
You can find the most common compounds in the following list. For other compounds please contact our
Technical Department.
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Material code
Code
NORSOK
M-710
Approval
10
34
55
Yes
Yes
24
12
11
Colour
Application
Temp
range
Virgin PTFE
White
Best for static applications requiring positive sealing.
Good in vacuum with low gas permeability.
Good for cryogenic service.
-260
+260
Black
Much better temperature resistance than virgin PTFE.
Better extrusion resistance higher wear resistance.
Excellent for corrosive service, steam and hot water
applications. Ideal for unlubricated service.
-260
+300
Grey
Excellent wear resistance because of internal lubrication
with MoS2. Often used for high-pressure extrusion
resistance or high speed, high-pressure rotary
applications. Only for use on very hard mating surface
because of its abrasive properties.
-240
+300
Bronze
Highly filled compound with excellent wear, temperature
and pressure resistance. Ideal for high-speed
applications.
Limitations in use because of chemical incompatibilities.
-260
+300
PTFE+graphite
PTFE+glass/
MoS2
PTFE+bronze
Yes
91
33
Description
Yes
Yes
A dynamic material for softer mating surfaces and a
static material for high temperatures.
PTFE+aromatic
Cream
Excellent wear resistance without abrasion.
polyester
Not recommended for applications involving
steam > 120°C.
Among the toughest, most wear-resistant materials
but with limited temperature and chemical resistance.
Intended for reciprocating or very slow rotary
UHMW-PE
Translucent
applications. Good lubricity in water.
It can serve in cryogenic conditions.
Higher coefficient of friction than PTFE.
Particularly suited for highly corrosive service.
Widely used in dynamic steam and water applications.
PTFE+carbon/
Black
Excellent general purpose material and often used in
graphite
rotary applications.
Performs well in non-lubricated system.
Modified
Virgin PTFE
-260
+315
-260
+80
-260
+300
White
Similar to virgin PTFE but lower gas permeability, higher
extrusion resistance and smoother surface on machined
parts. Can be used in slow, infrequent dynamics.
Good for cryogenic service.
-260
+300
Carbon fibre lowers creep, increases flexural and
compressive modulus and raises hardness. Thermal
expansion is lower and electrical conductivity is higher.
Good for strong bases and hydrofluoric acids.
Excellent wear behavior in aquaeous environment.
-260
+300
Very strong material with temperature resistance.
Static use or slow, intermittently dynamic.
-200
+315
41
Yes
PTFE+carbon/
fibre
Black
15
Yes
Virgin PEEK
Tan
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Spring load
Spring design and material
Spring compression
Spring material
300 series stainless steel
(300, 302, 304)
316 stainless steel
17/7 PH stainless steel
Cobalt-chromium-nickel alloy
Elgiloy®
Inconel® X-750
Hastelloy® C-276
Application
General-purpose spring material for most media up to 315°C.
Recommended up to 200°C in corrosive media.
Low-cost.
Standard material for cantilever springs.
316 provides additional corrosion resistance due to its higher nickel and
molybdenum content.
Typically used in food and sea water applications.
Limited availability in cantilever springs.
17/7 PH exhibits better retention of mechanical properties at
temperatures above 200°C than 300 series stainless steel.
Precipitation-hardenable.
Standard material for helical springs.
Originally developed as a spring material for watches.
Known for its excellent resistance to severe corrosive environments and
use at temperatures above 260°C.
Commonly used in oil industry applications.
Standard material for helical and cantilever springs.
NACE approved material in heat-treated condition.
Inconel X-750 offers highest corrosive resistance.
Commonly used in high-temperature environments.
NACE approved material in heat-treated and cantilever springs.
Limited availability in helical and cantilever springs.
Resistant in severely corrosive media when temperature exceeds 200°C.
Limited availability in helical springs.
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Radial LIPRING groove dimensions
SEAT
STEM/FLANGE
BODY/COVER-RADIAL
Seals can be supplied for any diameter as per the following table
OD
Suggested
h8
G
G1
G2
R
Groove
+ 0,2
-0
Groove
+ 0,2
-0
max
H8
Groove
+ 0,2
-0
1/16”
7,5 - 75
B + 2,84
2,4
3,8
5,3
0,30
3/32”
5,5 - 180
B + 4,52
3,6
4,6
6,2
0,50
1/8”
6,0 - 250
B + 6,15
4,8
6,0
7,7
0,50
3/16”
12,5 - 300
B + 9,45
7,1
8,5
10,8
0,75
1/4”
50,0 - 500
B + 12,12
9,5
12,1
14,7
0,75
3/8”
150,0 - 1400
B + 18,75
13,3
15,8
19,4
0,75
1/2”
300,0 - 3000
B + 25,40
18,0
20,5
23,5
0,75
Nominal
Cross section
ID
Standard
Groove G for type: HA - HB - VA
Extended heel or with Back-up
Groove G1 for type: HC - HD - HE - HF - VB - VC - UA - UB
Extended heel with Back-up or Standard with double Back-up
Groove G2 for type: HG - HH - HM1 - HN1 - UC - VD - UD - VG - UG
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Face LIPRING groove dimensions - internal pressure
Seals can be supplied for any diameter as per the following table
OD
D
G
G1
G2
Suggested
H11
Groove
depth range
Groove
width min.
Groove
width min.
Groove
width min.
max
1/16”
10 - 65
1,42 - 1,47
2,4
3,3
5,3
0,30
3/32”
14 - 100
2,26 - 2,31
3,6
4,5
6,2
0,50
1/8”
25 - 200
3,07 - 3,12
4,8
6,5
7,7
0,50
3/16”
48 - 350
4,62 - 4,68
7,1
8,0
10,8
0,75
1/4”
115 - 400
6,05 - 6,12
9,5
11,3
14,7
0,75
3/8”
200 - 1000
9,47 - 9,58
13,3
15,8
19,4
0,75
1/2”
325 - 3000 12,70 - 12,80
18,0
20,5
23,5
0,75
Nominal
Cross section
R
Standard
Groove G for type: FA1 - FE1
Extended heel or with Back-up
Groove G1 for type: FA2 - FA3 - FE2 - FE3
Extended heel with Back-up or Standard with double Back-up
Groove G2 for type: FA4 - FA6 - FE4 - FE6
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Face LIPRING groove dimensions - external pressure
Seals can be supplied for any diameter as per the following table
OD
D
G
G1
G2
Suggested
H11
Groove
depth range
Groove
width min.
Groove
width min.
Groove
width min.
max
1/16”
5 - 65
1,42 - 1,47
2,4
3,3
5,3
0,30
3/32”
10 - 100
2,26 - 2,31
3,6
4,5
6,2
0,50
1/8”
20 - 200
3,07 - 3,12
4,8
6,5
7,7
0,50
3/16”
40 - 350
4,62 - 4,68
7,1
8,0
10,8
0,75
1/4”
90 - 400
6,05 - 6,12
9,5
11,3
14,7
0,75
3/8”
200 - 1000
9,47 - 9,58
13,3
15,8
19,4
0,75
1/2”
300 - 3000 12,70 - 12,80
18,0
20,5
23,5
0,75
Nominal
Cross section
R
Standard
Groove G for type: FC1 - FG1
Extended heel or with Back-up
Groove G1 for type: FC2 - FC3 - FG2 - FG3
Extended heel with Back-up or Standard with double Back-up
Groove G2 for type: FC4 - FC6 - FG4 - FG6
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Range of standard models
Radial helical spring
HA
HC
HE
HG
HM1
HB
HD
HF
HH
HN1
Radial cantilever spring
VA
VB
VC
VD
VG
UA
UB
UC
UD
UG
FA3
FA4
FA6
FC3
FC4
FC6
FE3
FE4
FE6
FG3
FG4
FG6
Face internal pressure helical spring
FA1
FA2
Face external pressure helical spring
FC1
FC2
Face internal pressure cantilever spring
FE1
FE2
Face external pressure cantilever spring
FG1
FG2
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Non-standard models
Besides the standard range of LIPRING there are many additional, non-standard types which have been
developed, customized and proven over the years for specific applications in many different industries and
final products. Our Technical Department recommends these for special requirements.
Dimensional data has not been provided as many of these seal types are customized for specific groove
configurations which differ from the standard recommendations.
To order or request a quotation for a non-standard LIPRING, please advise all your requirements by completing the “Lipring application data” (forms at the end of this catalog).
Please send the completed form to sales@prpitalia.it
Our Technical Department will respond quickly with detailed recommendations.
NI3
PT1
PKA
DD3
DI3
PT5
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Groove design and installation guidelines
LIPRING are rigid in comparison to seals made from elastomeric materials. They can be damaged if
stretched or compressed beyond their material limitations. It is recommended a two-piece, split-groove
design, whenever possible. This allows easy installation or removal of the LIPRING without the need for
additional tooling and this will greatly reduce the risk of damage to the seal.
It is necessary that all edges across which the seal might pass during installation are blended and very
smooth to prevent damage to the seal.
Cross
K
section mm
Cross
K
section mm
1/16” 0,20
1/16” 0,90
3/32” 0,30
3/32” 1,10
1/8”
1/8”
0,30
1,25
3/16” 0,40
3/16” 1,50
1/4”
0,45
1/4”
1,75
3/8”
0,60
3/8”
3,50
1/2”
0,80
1/2”
4,00
Sometimes the use of the open groove configuration is not practical or possible. An alternative to the open
groove is the step-cut or partially closed-groove configuration. This solid one-piece design has a reduced
wall on the pressure side of the groove. This allows the seal to snap into the groove without the need for
a separate retainer or installation tools.
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Temperature, pressure and extrusion gap
The pressure capability of a LIPRING is a function of temperature, pressure, seal material, seal design,
and extrusion gap. An excessive extrusion gap in the given application conditions will cause the polymer
material to migrate towards the clearance until rupture in the jacket material and failure of the seal are
inevitable. Eccentricity also affects the extrusion gap and should be considered in the seal design.
Maximum extrusion gap (mm)
Seal Type
Materials
Class A
Class B
Class C
Class D
Virgin PTFE (10), TFM (11)
PTFE graphite (34)
PTFE aromatic polyester (12)
0.10
0.08
0.05
----
PTFE GlassMoS2 (55)
PTFE Bronze (24)
UHMWPE (91)
PTFE Carbon Graphite (33)
PTFE Carbon fiber (41)
0.15
0.1
0.08
0.05
Virgin PTFE (10), TFM (11)
PTFE graphite (34)
PTFE aromatic polyester (12)
0.20
0.10
0.08
----
PTFE GlassMoS2 (55)
PTFE Bronze (24) UHMWPE (91)
PTFE Carbon Graphite (33)
PTFE Carbon fiber (41)
0.25
0.20
0.10
0.08
PTFE GlassMoS2 (55)
PTFE Bronze (24) UHMWPE (91)
PTFE Carbon Graphite (33)
PTFE Carbon fiber (41)
0.25
0.20
0.10
0.08
PEEK (15)
0.30
0.25
0.20
0.10
In case of a combination of pressure and temperature above Class D or in case of an operating temperature
above 260 °C, pls. consult our Technical Department. Hardware designs without centering devices must
consider the diametral clearance as the maximum extrusion gap.
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Surface finish and hardness
Proper surface finish of the seal groove is critical to ensure positive sealing and achieve the longest possible
seal life in dynamic applications.
Mating surfaces that are too rough can create leak paths and be very abrasive to the seal.
To maximize seal performance, the recommendations for surface roughness in table below.
As a general rule, the higher the sealing surface hardness the better the seal performance.
Higher hardness reduces wear and increases seal life.
Fluid
Static
Dynamic
Rotation
Gas/ Low temperature
Hydrogen
Helium
Freon
Oxygen
Liquid nitrogen
Ra=0,3µm
Ra=0,2µm
Ra=0,1µm
Low viscosity gases/liquids
Air
Alcohol
Gaseous Nitrogen
Natural gas
Ra=0,6µm
Ra=0,3µm
Ra=0,2µm
Medium and high viscosity fluids
Water
Oil
Grease
Liquid adhesives
Ra=0,8µm
Ra=0,4µm
Ra=0,2µm
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LIPRING APPLICATION DATA 1
Company
Phone
Reference person
E-mail
STEM/FLANGE
Internal diameter with tolerance (ID)
External diameter with tolerance (OD)
Groove length (G)
Extrusion gap (E) / (E1)
Media / Service
Liquid
Gas
Operating temperature
Operating pressure
Test Pressure
Stem chamfer (L1)x(α°1)
Flange chamfer (L2)x(α°2)
Radius (R)
Roughness (Ra)
Special request
Others
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LIPRING APPLICATION DATA 2
Company
Phone
Reference person
E-mail
BODY/COVER-RADIAL
Internal diameter with tolerance (ID)
External diameter with tolerance (OD)
Groove length (G)
Extrusion gap (E)
Media / Service
Liquid
Gas
Operating temperature
Operating pressure
Test Pressure
Cover chamfer (L1)x(α°1)
Body chamfer (L2)x(α°2)
Radius (R)
Roughness (Ra)
Special request
Others
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LIPRING APPLICATION DATA 3
Company
Phone
Reference person
E-mail
SEAT
Single Piston Effect (SPE)
Double Piston Effect (DPE)
Internal diameter with tolerance (ID)
External diameter with tolerance (OD)
Groove length (G)
Extrusion gap (E)
Media / Service
Liquid
Gas
Operating temperature
Operating pressure
Test Pressure
Body chamfer (L1)x(α°1)
Seat chamfer (L2)x(α°2)
Radius (R)
Roughness (Ra)
Special request
Others
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LIPRING APPLICATION DATA 4
Company
Phone
Reference person
E-mail
BODY/COVER FACE
Internal diameter with tolerance (ID)
External diameter with tolerance (OD)
Groove length (G)
Cross Section (D)
Extrusion gap (E)
Media / Service
Liquid
Gas
Operating temperature
Operating pressure
Test Pressure
Radius (R)
Roughness (Ra)
Special request
Others
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LIPRING APPLICATION DATA 5
Company
Phone
Reference person
E-mail
BODY/COVER FACE
Internal diameter with tolerance (ID)
External diameter with tolerance (OD)
Groove length (G)
Cross Section (D)
Extrusion gap (E)
Media / Service
Liquid
Gas
Operating temperature
Operating pressure
Test Pressure
Radius (R)
Roughness (Ra)
Special request
Others
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The data and tables shown in this
catalog are based upon information
from material suppliers and careful
examination of available publications
and are believed to be accurate and
reliable; however, it is the user’s
responsibility to determine suitability
for use.
You should thoroughly test any proposed
use of our seals and indipendently
conclude satisfactory performance in
your application.
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R
Certified quality system UNI EN ISO 9001
www.carco.it
Prp
Basiano (Italy)
sales@prpitalia.it
Tel.: +39 02 48702970
Carco Headquarters
Basiano (Italy)
sales@carco.it
Tel.: +39 02 95760331
Carco GmbH
Hamburg (Germany)
sales@carco-germany.de
Tel.: +49 40 21985855
Carco America LLC
Sharon Center (OH)
mdolinar@carco-usa.com
Tel.: +1 330 419 1003
Carco Asia Ltd.
Shenzhen (China)
carcochina@carco.it
Tel.: +86 755-84594011
ICT21
Les Pennes Mirabeau (France)
contact@ict.fr
Tel.: +33 442772857