Phenolic Insulation Gasket Set

QS Gasket: Xiamen Phenolic insulation Gasket Set

Phenolic Insulation Gasket Set for 8 Inch RX50 API 6A 5000 psi flanges, with assembly guidance for phenolic with ZPS.

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One-Minute Overview

Phenolic Insulation Gasket Set is supplied for 8 Inch RX50 API 6A 5000 psi flanges with phenolic washers and ZPS.
Staged cross-pattern tightening keeps the phenolic 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. Phenolic Insulation Gasket Set pairs a phenolic element with phenolic washers and ZPS for API 6A 5000 psi flanges in 8 Inch RX50. Correct bolt sequence and a square insulating stack are what preserve both the seal and the dielectric break over time.

Name: Phenolic Insulation Gasket Set
Material: phenolic
Standard: API 6A
Size: 8 Inch RX50
Pressure: 5000 psi
Type: D
Sleeves: Mylar
Washers: phenolic with ZPS
Note: Full dimensions and bolt pattern are confirmed per inquiry.

Before fitting, verify the API 6A bolt circle, the 5000 psi rating and the available grip length. Choose the 8 Inch RX50 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 API 6A flange and bolt grade. Even, staged compression protects the phenolic element and keeps the 8 Inch RX50 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 5000 psi. 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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