Current position > Contact Us
Quick Answer: CORASEALS supplies custom spiral wound gaskets to match flange dimensions, pressure class, service temperature, and fluid. Send the flange standard, gasket ID × OD × thickness, metal strip material, filler material, and operating conditions for a quote. Confirm the gasket seating surface and pressure class before finalizing dimensions.
A spiral wound gasket is a semi-metallic flange gasket made from alternating layers of a formed metal strip and a softer filler material. The sealing element is wound in a spiral shape. The metal strip provides strength and resilience. The filler conforms to flange surface irregularities and blocks leakage. A custom spiral wound gasket means the ID, OD, thickness, metal strip, filler, outer ring, and inner ring are selected for a specific flange and service condition.
Standard spiral wound gaskets fit common ASME pipe flanges. Custom gaskets are used when the flange is non-standard, the sealing area is narrow, the temperature or pressure is outside common ranges, or the plant specification requires a specific material combination. CORASEALS supplies custom spiral wound gaskets within its flange gasket product range.
The inquiry data below prevents dimensional errors and material mismatch. State whether dimensions are in millimeters or inches.
The gasket ID must clear the pipe bore and match the flange seating surface. The OD must fit inside the bolt circle without covering bolt holes. If the gasket has an inner ring, confirm the inner ring ID and material. The inner ring prevents windings from buckling into the bore and protects the sealing element from flow erosion.
The metal strip resists crushing, blowout, and temperature. Common choices are stainless steel 304, 316L, 321, and Inconel. The filler creates the primary seal. Graphite filler is common in steam, high temperature hydrocarbon, and general chemical flange service. PTFE filler is selected for strong acids, oxidizing media, or services where graphite cannot be used. The final material selection depends on the actual fluid composition, temperature, pressure, and plant specification.
CORASEALS does not assign fixed temperature limits to a material combination without a full service review. Temperature limits change with filler type, metal grade, gasket thickness, flange design, and bolt load. Send the operating data for a confirmed material recommendation.
An outer ring centers the gasket on the flange and limits over compression. An inner ring protects the sealing element and prevents inward buckling. Many ASME B16.20 gaskets use an outer ring and inner ring for raised face flanges. For tongue and groove or male and female joints, the ring construction can be different. Some flange designs allow a spiral wound gasket without rings. Confirm the flange type before selecting that construction.
The maintenance team should measure the flange seating area with a calibrated tool. The old gasket alone is not a reliable reference because the old gasket may be deformed, crushed, or repaired. Check flange surface finish, flatness, and bolt hole alignment. A seating surface with pitting, scoring, or heavy corrosion may require a thicker gasket or a different sealing concept. CORASEALS can review your drawing or sample photo before quotation.
For standard ASME flanges, the gasket dimensions should follow ASME B16.20 and the pipe flange standard. The pressure class and raised face dimensions affect the gasket ID and OD. The winding OD must not overlap the bolt circle. The gasket ID must not reduce the pipe bore below the allowable flow area.
Custom spiral wound gaskets are used in heat exchangers, steam piping, chemical flanges, oil and gas piping, reactors, boiler systems, and refinery joints. These gaskets are also used where standard dimensions do not fit equipment such as filter housings, vessel manways, valve bonnets, and non-standard companion flanges.
Send the complete service data in one message. For a faster review, include a drawing or photo with dimensions marked on the flange seating surface. If the gasket is for a heat exchanger or vessel, state the gasket type, partition bar requirement, and any pass bar dimensions.
Send CORASEALS the flange standard, pressure class, pipe size, gasket ID × OD × thickness, seating surface type, operating temperature, operating pressure, medium, metal strip material, filler material, ring construction, drawing or sample photo, and required quantity.
1. What is a custom spiral wound gasket?
A custom spiral wound gasket is a semi-metallic flange gasket made with specified ID, OD, thickness, metal strip, filler, and ring construction. A custom spiral wound gasket is used when standard flange gaskets do not match the equipment or service conditions.
2. What information do I need to request a quote?
Send the flange standard, pressure class, pipe size, gasket ID × OD × thickness, seating surface type, operating temperature, operating pressure, medium, metal strip, filler, ring construction, quantity, and a drawing or sample photo.
3. Can CORASEALS make non-standard gasket dimensions?
Yes. Custom spiral wound gaskets can be produced to non-standard ID and OD dimensions as long as the flange seating surface and bolt clearance are checked. Send the marked drawing or sample photo for review.
4. Should I choose graphite or PTFE filler?
Graphite filler is common for steam and high temperature hydrocarbon service. PTFE filler is used for strong acids and oxidizing media. The final selection depends on the full fluid composition, temperature, pressure, and flange design.
5. Do I need an inner ring?
An inner ring is normally used on raised face flanges and in services with high flow, vacuum, or pressure fluctuation. The inner ring protects the windings from erosion and inward buckling. Confirm the flange configuration before removing the inner ring.
