4 Inch Gylon 3500 Gasket

QS Gasket: 4 inch Gylon3500 Gasket

4 Inch Gylon 3500 Gasket for 4 Inch ASME B16.21 150LB flanges, with assembly guidance for G11 sleeves and washers with ZPS.

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One-Minute Overview

4 Inch Gylon 3500 Gasket is supplied for 4 Inch ASME B16.21 150LB flanges with G11 sleeves, washers and ZPS.
Staged cross-pattern tightening keeps the Gylon 3500 element evenly compressed.
Sleeves must span the full grip length and sit square under every washer.
Torque values and stack height are confirmed per inquiry.

Most isolation joint failures trace back to assembly practice rather than the gasket itself. 4 Inch Gylon 3500 Gasket pairs a Gylon 3500 element with G11 sleeves, washers and ZPS for ASME B16.21 150LB flanges in 4 Inch. Correct bolt sequence and a square insulating stack are what preserve both the seal and the dielectric break over time.

Name: 4 Inch Gylon 3500 Gasket
Material: Gylon 3500
Standard: ASME B16.21
Size: 4 Inch
Pressure: 150LB
Type: RF
Complete with: G11 sleeves and washers with ZPS
Note: Full dimensions and bolt pattern are confirmed per inquiry.

Before fitting, verify the ASME B16.21 bolt circle, the 150LB rating and the available grip length. Choose the 4 Inch gasket so the bore clears the pipe, then confirm that each sleeve is long enough for the assembled stack; a sleeve that ends short of the washer leaves a live metal path.

Clean and inspect both faces, set the gasket concentric with the bore, and tighten in at least three cross-pattern passes to the torque defined by the flange and bolt grade. Seat sleeves and washers square, then recheck the joint after the first heat-up because creep and thermal growth relax bolt load. Finish by measuring electrical continuity across the flange.

FAQ

Q1. What bolt sequence is recommended for this kit?

A cross or star pattern in at least three passes to the torque set by the ASME B16.21 flange and bolt grade. Even, staged compression protects the Gylon 3500 element and keeps the 4 Inch gasket centred on the bore.

Q2. How do I know the insulating sleeves are fitted correctly?

Each sleeve must cover the full grip length and sit square under its washer, with no metal-to-metal contact. After assembly, measure continuity across the joint; a short or cocked sleeve shows up immediately as a conducting path.

Q3. Why is a torque recheck needed after start-up?

Gasket creep and thermal expansion both reduce bolt preload at 150LB. A recheck after the first thermal cycle restores even compression and protects the dielectric separation for the long term.

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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