All ANSI rated flanges to 600#/2,225 psi respectively. Maximum hydrotest pressure is 2480 psi and 302Fp>
APPLICATIONS
The LineBacker™ is an excellent choice for isolating distribution lines and transport lines for gas, oil and water. The screened version is the best available product for filtering welding slag, rocks, nuts, bolts and other particulates from traveling downstream and damaging valves, pumps, compressors, etc. Because the LineBacker™ has very good resistance to creep relaxation², it performs well in heat exchangers, applications with high vibration or excessive thermal cycling.
OPTIONS
Gasket Types
Isolating gaskets may be specified as either “E” or “F” type while single, double or one-piece sleeve and washer sets are offered as options for varying degrees of electrical isolation between the flanges. A wide variety of material options exist for both isolating gaskets and sleeve and washer materials.
All kits are correctly sized for the application and conveniently packaged to minimize loss of component parts during installation.
Type E Gasket (Full Face) The gasket retainer extends out to the O.D. of the flange. Holes are cut at the bolt circle to accommodate threaded studs and sleeves.
Type F Gasket(Ring Type) The gasket retainer extends out to the I.D. of the bolt circle. The threaded studs and sleeves center the gasket in the flange.
Single Washer Set flange isolation kits include the following items for each threaded stud:
- 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 protected system.
Double Washer Set
Double washer set flange isolation kits include the following components 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.
Acetal One-Piece Sleeve and Washer Sets
One-piece sleeves eliminate the possibility of error by installers. 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.