PSI Isolating Sleeves, Washers, and Kits

Description

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

PSI Isolating Sleeve and Washer

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

PSI Isolating Sleeve and Washer

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

PSI Isolating Sleeve and Washer

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

Physical Properties of Sleeve Material

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.

Physical Properties of Washer Material

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

PSI Isolating Single Washer Kit

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

PSI Double Washer Kit

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

PSI One Piece Sleeve and Washer Kit

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.

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