ASME/ansi flange gaskets
Meet ASME/ANSI design quality and compliance for durable, proven flange gaskets
Rubber and aramid flange gaskets are essential sealing solutions for flange assemblies in many industries, such as petrochemicals, industrial plumbing, energy, and water treatment. These gaskets, combining the flexibility of rubber (such as nitrile, EPDM, or silicone) with the strength of aramid fibers, offer exceptional resistance to pressures, temperatures, and aggressive chemicals.
Aramid has played a crucial role in improving the safety and sealing of systems that previously relied on asbestos. Their role is crucial: ensuring a perfect seal between two flange surfaces, preventing fluid or gas leaks while withstanding extreme conditions. Thanks to their hybrid composition, these aramid gaskets combine elasticity for optimal compression and durability for long-lasting performance, even in corrosive or high-temperature environments.
At ELASFOR, we understand that every industrial application has unique requirements. That’s why we excel at providing custom flange gaskets, designed to precisely meet our customers’ needs. Whether you require a specific dimension, a material suitable for specific fluids, or resistance to extreme conditions, we supply rubber and aramid gaskets in every imaginable size and composition. Thanks to our commitment to quality through a selection of premium materials and 100% inspection, we guarantee reliable and high-performance sealing solutions, suitable for the most demanding projects.
ASME/ANSI Flange Gasket Measurements and Other Considerations
ASME/ANSI Flange Gaskets: Steps to Accurate Measurement
On flange gaskets are widely used in industrial installations, especially in the petrochemicals, energy or water treatmentThese gaskets are usually circular and may have bolt holes. To ensure a perfect fit and prevent leaks, here are the essential measurements to take:
Inside diameter (ID) and outside diameter (OD)
These measurements are fundamental for the adaptation of the seal on the flange. Use a tape measure or a caliper to measure the internal diameter (distance between the inner edges) and the outer diameter (total distance from one edge to the other).
If full flange gasket: Primitive diameter or PCD (Pitch Circle Diameter) or PCB (Position at the center of the bolt)
For flange joints with bolt holes, measure the pitch diameter (PCD) is crucial. This involves measuring the distance between the opposite holesThis operation ensures that the bolts will align perfectly and the seal will remain reliable.
* Ring type flange gasket does not have flange holes and is simply measured with ID, OD and thickness.
Frame-type joints: measuring guide
On frame-type joints ( picture frame gaskets) are often rectangular or square and require several measurements to ensure accurate manufacturing:
- External and internal dimensions : accurately measure length, width and internal opening.
- Mounting holes and spacing : note the diameter and distance between holes. Variations may affect theindustrial sealing.
The Importance of ASME/ANSI Flange Gasket Thickness
The thickness of the gasket plays a key role in performance. A gasket that is too thin can cause leaks, while one that is too thick can lead to poor compression and damage to flanges. For critical industrial applications, a caliperis recommended for accurate measurement.
Let us guide you on the appropriate profile type, the ideal material (rubber, graphite, PTFE, composite metal) and the dimensions and tolerances to be respected.
ELASFOR designs tailor-made a solution adapted to your flange whatever its condition or application ensuring a extended lifespan.
Traps to avoid
- The nominal diameter or NPS is not an actual measurement of the flange gasket. Ex: a 2.0″ NPS gasket actually measures 2.380″ ID.
- The ASME pressure determined by #150, #300 etc affects the flange gasket size. Ex: an NPS 2.0″ #150 gasket measures 6″ OD and an NPS 2.0″ #300 gasket measures 6.5″ OD.
- A thicker gasket will not improve performance in most cases; quite the opposite. Thinner gaskets exhibit less creep and relaxation, maintaining a consistent clamping force and reducing the risk of leaks. Thinner gaskets also have a lower permanent compression ratio, improving their durability, especially in dynamic or high-temperature environments. They improve heat transfer, require less tightening torque, and reduce material costs.
We are here for you
Question ?
We are flexible. For expert advice, current project analysis or problem solving to get you out of a jam, just reach out !