Sheet 20/77Products / Steel and structural / Spiral-wound gasketRev
Steel and structural · catalogue item
Spiral-wound gasket
Gasket of V-shaped metal strip wound with soft filler, for raised-face flanged joints in pressure service.
In short
Gasket of V-shaped metal strip wound with soft filler, for raised-face flanged joints in pressure service. JJ Projects sources it to the specification the buyer names. Typical reference, standards: ASME B16.20.
Specification references
Typical references only. The governing specification is the one on your purchase order or datasheet.
| Property | Typical reference |
|---|---|
| Standards | ASME B16.20 |
| Winding | 304 or 316L stainless steel strip |
| Filler | Flexible graphite or PTFE |
| Rings | Centering ring, with inner ring where specified |
Specification references describe what the order names, not a certification held by JJ Projects.
Steel and structural
Typical uses
- 01Sealing raised-face flanged joints in refinery, chemical and power piping
- 02Valve bonnet and equipment nozzle joints in pressure service
- 03Joints that see thermal cycling and pressure swings, where a resilient gasket is needed
- 04Replacement gaskets during turnarounds and maintenance
What to include in a request
A request with these details can be quoted without a round of questions. Send what you have and we will ask for the rest.
- 01NPS and pressure class of the flange, which set the gasket dimensions under ASME B16.20
- 02Winding material, 304 or 316L stainless, or other alloy if the fluid requires it
- 03Filler: flexible graphite or PTFE
- 04Outer centering ring material, and the inner ring, which is commonly specified with graphite filler and in higher pressure classes
- 05Flange facing and finish the gasket will seal against
- 06Quantity
- 07Documents: marking to ASME B16.20 and any material certificate required
Steel and structural
Related items
- 01Stud bolt with nutsStud bolts with heavy hex nuts: ASTM A193 B7, B8M and L7 studs with A194 2H nuts for flanged joints, and what to state in the request so it can be quoted.Learn more
- 02Weld neck flangeForged weld neck flanges to ASME B16.5 and B16.47 in A105, A350 LF2 and A182 grades, and what a flange request needs to state to be quoted properly.Learn more
- 03Slip-on flangeForged slip-on flanges to ASME B16.5 in A105 and A182 grades, raised or flat face, and what to state when you request slip-on flanges for a quote.Learn more
- 04Blind flangeForged blind flanges to ASME B16.5 and B16.47 in A105 and A182 grades, Class 150 to 2500, and what to include in a blind flange request for a quote.Learn more
Guides
Guides
- 01Stud bolts and gaskets: ASTM A193 and A320How to specify flange bolting and gaskets: ASTM A193 B7, B7M, B8, A194 2H and 2HM nuts, A320 L7, coatings and spiral-wound gaskets to ASME B16.20.Learn more
- 02Flange pressure classes: ASME B16.5 and B16.47How ASME flange classes 150 to 2500 work: B16.5 vs B16.47, pressure-temperature ratings, facings RF, FF and RTJ, flange types and common materials.Learn more
Questions
Questions
01Why does a spiral-wound gasket often have an inner ring?
An inner ring supports the windings, limits compression and shields the gasket from the fluid. It is commonly specified with flexible graphite filler and in higher pressure classes. Follow the gasket specification of your project.
02Can a spiral-wound gasket be reused?
Standard practice is to fit a new gasket each time a joint is opened, because the winding is compressed and does not recover. Reuse is a decision for the joint owner and is not recommended.
03How do I choose the filler?
Flexible graphite suits high temperature and a wide range of chemicals; PTFE is chosen for chemical resistance at lower temperatures. The fluid, temperature and pressure decide, and the gasket manufacturer's data sheet gives the limits.
Send the specification. We will take it from there.
A material list, a drawing or a single line: tell us what the project needs and where it is going.