300LB Gylon 3500 Insulation Gasket

QS Gasket: 300LB Gylon3500 Insulation Gasket

300LB Gylon 3500 Insulation Gasket for leak-tight ASME B16.5-WN-RF 300LB joints, supplied with G11 sleeves, washers and ZPS.

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One-Minute Overview

300LB Gylon 3500 Insulation Gasket is built for a leak-tight ASME B16.5-WN-RF face at 300LB with a Gylon 3500 sealing element.
G11 sleeves and washers with ZPS come as a matched set, so the insulating stack stays concentric under bolt load.
The 18 Inch bore and gasket OD are checked against the flange drawing before cutting.
Final thickness and bolt circle are confirmed per inquiry.

Leak tightness on an isolated flange depends on even compression, not just on the gasket material. 300LB Gylon 3500 Insulation Gasket combines a Gylon 3500 element with G11 sleeves, washers and ZPS for ASME B16.5-WN-RF flanges rated 300LB. The assembly is sized for 18 Inch so the sealing face and the insulating hardware work as one stack.

Name: 300LB Gylon 3500 Insulation Gasket
Material: Gylon 3500
Standard: ASME B16.5-WN-RF
Size: 18 Inch
Pressure: 300LB
Type: F
Complete with: G11 sleeves and washers with ZPS
Note: Full dimensions and bolt pattern are confirmed per inquiry.

Confirm the facing type, the 300LB class and the ASME B16.5-WN-RF bolt circle first, because they determine how much compressive area is available. Then check that the Gylon 3500 element suits the medium and that the 18 Inch bore leaves the pipe clear; an undersized bore creates turbulence and erodes the gasket edge.

Degrease both faces and remove all old gasket material before setting the element concentric with the bore. Bring bolts up in three cross-pattern passes, pausing between passes so the Gylon 3500 element creeps evenly. Fit sleeves square under the washers, then recheck torque after the first thermal cycle when gasket relaxation is greatest.

FAQ

Q1. What causes an isolated flange to leak after start-up?

Uneven bolt load, a damaged ASME B16.5-WN-RF face or a sleeve seated at an angle are the usual causes. Creep of the Gylon 3500 element after the first heat-up also relaxes the joint, which is why a torque recheck is specified.

Q2. How is the 18 Inch bore verified before the gasket is cut?

Compare the pipe ID and the ASME B16.5-WN-RF flange drawing with the proposed bore. The opening must clear the pipe without leaving an unsupported gasket ring that could extrude at 300LB.

Q3. Why must the whole insulating stack come from one kit?

Mixing G11 sleeves and washers with ZPS from different sources changes stack height and compression. A matched set keeps every bolt equally isolated and lets the Gylon 3500 element compress uniformly across the face.

Q4. What's the minimum I can order?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Kits made to your drawing or for a non-standard bolt pattern are quoted individually, because the minimum really depends on the material and the tooling involved.

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