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PSI Isolating Sleeves, Washers, and Kits
PSI Isolating Sleeves, Washers, and Kits
Isolating Sleeves are designed to easily fit over standard size flange bolts/studs in standard bolt holes. Isolating Washers are made to fit over isolating sleeves.
Isolating Washers – Standard 1/8 in. Thick*
Isolating washers are available in the following materials:
-
- High Strength Glass Clad Phenolic
- G-3 High Temperature Phenolic
- G-7 Silicon Glass
- G-10 Epoxy Glass
- G-11 Epoxy Glass
Designed to provide tough, positive isolation, PSI isolating washers are available for bolt sizes from 1/2 in. (12.7mm) through 3 1/2 in. (88.9mm) and are made to fit over the isolating sleeves.
* Other thicknesses are available by special order.
Steel Sleeve Washers
Steel washers are designed to fit over the isolation sleeve or the retainer ring on the one-piece sleeves and washers. The outside diameter is sized to fit within the bolt facing on ANSI standard flanges. They are made of 1/8 in (3.2mm) thick plated hot-rolled steel.
NOTE: 304 stainless steel is available by special order.
CAUTION: Bolts with smooth shank portions may not fit in the sleeves. Verify prior to ordering.
Isolating Sleeves
Isolating sleeves are available in the following materials:
- Mylar
- Polyethylene
- Phenolic
- Nomex®
- G-7 Silicon Glass
- G-10 Epoxy Glass
- G-11 Epoxy Glass
Designed to easily fit over standard size flange bolts/studs in standard bolt holes. PSI isolating sleeves have a wall thickness of 1/32 in. (0.79mm) and are used with separate isolating and steel washers. They are available for standard American bolt sizes from 1/2 in. (12.7mm) to 3 1/2 in. (88.9mm) as well as metric bolt sizes of 12mm and larger.
One-piece Molded Acetal
Molded from acetal resin and available for bolt diameters from 1/2 in. to 1 1/2 in. (12.7 to 38.1mm), one-piece sleeves and washers are structurally tough but limited to applications where the flange temperature does not exceed 180°F (80°C) and compressive loads do not exceed 18,000 psi.
They are generally used as single washer sets because they’re molded to specific lengths and, in many instances, are longer than the thickness of a single flange. A washer centering ring positions the steel washer on the unit properly to avoid uneven pressures on the washers.
G-10 1 PC
Completely assembly custom made where ANSI rating exceeds 600#, operating temperatures up to 300°F (149°) and can handle compressive loads of 50,000 psi.
- One – 1/8 in thick steel washer
- One – 1/8 in thick G-10 washer
- One – G-10 Isolating Sleeve
Physical Properties
| ASTM | Test Method |
Polyethylene | Mylar | Nomex® | Phenolic | G-7 Silicon Glass |
G-10 Epoxy Glass |
G-11 Epoxy Glass |
One-Piece Molded Acetal |
|---|---|---|---|---|---|---|---|---|---|
| D149 | Dielectric Strength Volts/Mil (Short Term) |
400 | 4000 | 400 | 400 | 350 | 800 | 400 | 1200 |
| D695 | Compressive Strength (psi) |
N/A | N/A | N/A | N/A | N/A | N/A | N/A | 18,000 |
| D229 | Water Absorption (percent) |
0.01 | 0.8 | 0.7 | 1.6 | 0.10 | 0.04 | 0.04 | 0.22 |
| Operating Temperature Range Degrees Farenheit |
-30 to +180 | -59 to +149 | -65 to +450 | -20 to +225 | Cryogenic to +450 | Cryogenic to +302 | Cryogenic to +320 | -30 to +180 | |
| Operating Temperature Range Degrees Celsius |
-34 to +82 | -59 to +149 | -54 to +232 | -29 to +107 | Cryogenic to +232 | Cryogenic to +150 | Cryogenic to +160 | -34 to +82 | |
| D790 | Flexual Strength psi |
7,000 | 13,000 | 20,000 | 16,000 | 20,000 | 65,000 | 55,000 | 1,400 |
| Cut Through Resistance ft-lbs. |
1,800 | 3,500 | 4,000 | No Test | No Test | 16,000 | No Test | 3,400 | |
| *G-7 Material should not be used with hydrocarbons, not even in trace amounts. | |||||||||
| ASTM | Test Method |
Glass Clad Phenolic |
G-3 Hi-Temp Phenolic Glass |
G-7 Silicon Glass |
G-10 Epoxy Glass |
G-11 Epoxy Glass |
One-Piece Molded Acetal |
||
|---|---|---|---|---|---|---|---|---|---|
| D149 | Dielectric Strength Volts/Mil (Short Term) |
500 | 550 | 350 – 400 | 800 | 550 | 1200 | ||
| D695 | Compressive Strength (psi) |
33,000 | 50,000 | 40,000 | 69,000 | 50,000 – 80,000 | 18,000+ | ||
| D229 | Water Absorption (percent) |
1.6 | 0.7 | 0.07 | 0.04 | 0.10 | 0.22 | ||
| Operating Temperature Range Degrees Farenheit |
-65 to +300 | -65 to +392 | Cryogenic to +450 | Cryogenic to +302 | Cryogenic to +350 | -30 to +180 | |||
| Operating Temperature Range Degrees Celsius |
-54 to +149 | -54 to +200 | Cryogenic to +232 | Cryogenic to +150 | Cryogenic to +177 | -34 to +82 | |||
| *G-7 Material should not be used with hydrocarbons, not even in trace amounts. | |||||||||
Single Washer Set
Single washer set flange isolation kits include the following items for each bolt:
- One – 1/8″ thick steel washer
- One – Isolating washer
- One – Isolating sleeve
Application Considerations
In buried applications, single washer configurations may be used to allow the Cathodic Protection (CP) current to reach the nuts and bolts. If desired, nuts on the opposite side of the cathodically protected flange may be included as part of the CP system.
Double Washer Set
Double washer set flange isolation kits include the following items for each bolt:
- Two – 1/8″ thick steel washers
- Two – Isolating washers
- One – Full Length Isolating sleeve
Application Considerations
Double washer configurations may be used for added protection against the possibility of “shorting out” the nuts and bolts. In addition, double washer sets electrically isolate the nuts and bolts from both flanges.
One-Piece Sleeve and Washer Sets
One-Piece sleeve and washer set flange isolation kits include the following items for each bolt:
- Two – 1/8″ thick steel washers
- One – One-piece Isolating sleeve
Application Considerations
Easier to install, one-piece sleeves also allow the inspector a visual indication of sleeve usage. Due to the relatively low compressive strength of this material, its use is not recommended for high pressure or large diameter flanges that require high torque loads.
Note: G-10 One-Piece sleeve/washer assembly available for additional strength and convenience.
General/Economical
Flange Isolation Kit Specification
Materials for flange isolation kits on pipes containing water, aqueous fluids or natural gas (up to 220°F, 104°C) shall consist of the following components:
Isolating and Sealing Gasket
One full faced isolating and sealing gasket, LineBacker® Sealing Gasket – Type “E”, 1/8″ thick, phenolic retainer containing a precision tapered groove to accommodate the controlled compression of a EPDM quad-ring sealing element. Sealing element placement shall accommodate either flat, raised or RTJ face flanges. The quad-ring seal shall be pressure energized. The phenolic retainer shall have a 500 volts/mil dielectric strength and a minimum 25,000 psi compressive strength. The full faced flange isolation gasket shall be 1/8″ less in I.D. than the I.D. of the flange in which it is installed.
Full Length Bolt Isolating Sleeves
One full length Mylar sleeve (extending half way into both steel washers) for each flange bolt. The Mylar shall be a 1/32 inch thick tube with a 4000 volts/mil dielectric strength and water absorption of 0.8% or less.
Washers
Two, 1/8 inch thick, glass clad phenolic isolating washers for each bolt. Their compressive strength shall be 33,000 psi, dielectric strength 500 volts/mil and water absorption 1.6% or less. Two, 1/8 inch thick steel washers for each bolt. The I.D. of all washers shall fit over the isolating sleeve and the steel and isolating washers shall have the same I.D. and O.D.
Quality
Flange isolation kits shall be manufactured at a facility that has a registered ISO 9001:2000 Quality Management System. Submittals shall include copy of valid registration.
Availability
Gaskets shall be manufactured by Pipeline Seal and Insulator, Inc., Houston, Texas, U.S.A.,
Telephone: 713-747-6948
Facsimile: 713-747-6029
www.pipelineseal.com.
e-mail: info@psipsi.com
Performance suitability and material compatibility shall be determined by the user.
Top of The Line
Flange Isolation Kit Specification
Materials for flange isolation kits on pipes containing natural gas, oil and aqueous fluids (up to 280°F, 138°C) shall consist of the following components:
-
Isolating and Sealing Gasket
One full faced isolating and sealing gasket, LineBacker® Sealing Gasket – Type “E”, 1/8″ thick, G-10 retainer containing a precision tapered groove to accommodate the controlled compression of a Teflon (or Viton) quad-ring sealing element. Sealing element placement shall accommodate either flat, raised face or RTJ flanges. The quadring seal shall be pressure energized. The G-10 retainer shall have a 550 volts/mil dielectric strength and a minimum 50,000 psi compressive strength. The full faced flange isolating gasket shall be 1/8″ less in I.D. than the I.D. of the flange in which it is installed.
-
Full Length Bolt Isolating Sleeves
One full length G-10 sleeve (extending half way into both steel washers) for each flange bolt. The G-10 shall be a 1/32 inch thick tube with a 400 volts/mil dielectric strength and water absorption of 0.10% or less.
-
Washers
Two, 1/8 inch thick, G-10 isolating washers for each bolt. Their compressive strength shall be 50,000 psi, dielectric strength 550 volts/mil and water absorption 0.10% or less. Two, 1/8 inch thick zinc plated, hot rolled steel washers for each bolt. The I.D. of all washers shall fit over the isolating sleeve and both the steel and isolating washers shall have a same I.D. and O.D.
Quality
Flange isolating kits shall be manufactured at a facility that has a registered ISO 9001:2000 Quality Management System. Submittals shall include copy of valid registration.
Availability
Gaskets shall be manufactured by Pipeline Seal and Insulator, Inc., Houston, Texas, U.S.A.,
Telephone: 713-747-6948
Facsimile: 713-747-6029
www.pipelineseal.com.
e-mail: info@psipsi.com
Performance suitability and material compatibility shall be determined by the user.
For Large Diameter Flange Gasket or Flange Isolation Kit Applications.
It is strongly recommended that consideration be given to utilizing the Top of the Line Specification listed above.
Isolation Sleeves, Washers, and Kits
Flange isolation kits are available for all flange sizes, types, pressure ratings and materials. Each kit is individually and securely packed in a reinforced corrugated cardboard box, which is clearly labeled as to its contents for convenience in warehousing and field use inventory. Very large diameter gaskets are packaged separately from the sleeves and washers for convenience in storing and handling.