Insulation Kit

QS Gasket: Insulation Kit China Suppliers

Insulation Kit built around Garlock Gylon 3500 with G11 sleeves and washers for ASME B16.5.

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One-Minute Overview

Flange isolation assembly built around a Garlock Gylon 3500 retainer for ASME B16.5.
Supplied complete with G11 sleeves and washers for electrical discontinuity at the joint.
Rated for 3 Inch and Class 300 service, sealing and isolating in one kit.
Exact bolt pattern, thickness and dimensions are confirmed per inquiry.

A flange isolation assembly does two jobs at once: it seals the joint and it breaks the metallic path that lets stray currents and galvanic corrosion move between connected pipe sections. This one is built around Garlock Gylon 3500 with G11 sleeves and washers for ASME B16.5 at Class 300. Qishine supplies it where a dependable dielectric break matters as much as a leak-tight seal.

Name: Insulation Kit
Type: F
Standard: ASME B16.5 flange
Gasket material: Garlock Gylon 3500, G11 sleeves and washers
Size: 3 Inch
Pressure: Class 300
Note: Full dimensions and bolt pattern are confirmed per inquiry.

Start with the ASME B16.5 geometry and the Class 300 class, because they fix the gasket footprint and the bolt circle. Then match the retainer to the medium: Garlock Gylon 3500 for the listed service, with G11 sleeves and washers chosen so the insulating stack keeps its dielectric strength under bolt load. Confirm the gasket bore clears the pipe ID and that the 3 Inch dimensions are confirmed per inquiry against the flange drawing before anything is cut.

On installation, clean both flange faces, set the retainer concentric with the bore and bring the bolts up in a star pattern so compression stays even. Insulating sleeves must run the full grip length and seat square under the washers; a short or cocked sleeve can crush and short the bolt to the flange. Recheck torque after the first heat-up, because gasket creep and thermal growth both relax the joint. Used this way, the kit supports cathodic protection by keeping protection current on the intended side of the joint.

FAQ

Q1. How does this kit break the electrical path across the flange?

The Garlock Gylon 3500 retainer seals the joint while G11 sleeves and washers keep every bolt from touching the flange metal. With the current path interrupted, cathodic protection current stays on the protected side and galvanic corrosion between dissimilar metals is held in check.

Q2. What should I check on the flange face before fitting the gasket?

Inspect the ASME B16.5 surfaces for pitting, warping and old gasket debris, then verify the gasket bore clears the pipe. A clean, flat face lets the retainer compress evenly; a scored or dirty face concentrates bolt load and invites a leak under Class 300 service.

Q3. How tight should the bolts be, and do the sleeves change the torque?

Tighten in a cross pattern to the value set by the flange and bolt grade, in several passes, so the retainer compresses evenly. Insulating sleeves and washers must seat square: a cocked sleeve can crack under load, so confirm the full stack-up and recheck torque after the first thermal cycle.

Q4. What payment terms do you accept?

T/T, L/C at sight and other internationally accepted terms. The exact terms are agreed with you before production starts, because the payment schedule has to match the order value, the shipping method and the delivery schedule you need — which is also why we confirm them up front rather than after shipment.

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