PI Seal

The FMC PI seal design is an extremely reliable high pressure sealing mechanism. The PI assembly is comprised of an upper bit guide, the pressure intensified (PI) seal assembly, and lower ACME threaded lock ring to hold the packoff in the bottom of the tubing head.

FS-Seal

The FS-Seal is designed to seal against rough casing where wide tolerances and varying surface finishes create difficult sealing conditions.

The FS Seal is utilized by FMC as a large cross-section interference seal to bridge large extrusion gaps associated with sealing on rough mill casing.

S-Seal

Used for providing reliable sealing between machined components, FMC's S-Seal is suitable for a wide variety of applications within a wellhead system.

The S Seal design is employed by FMC as a versatile and reliable seal in applications of load and temperature cycles, where conventional interference type seal designs (O-rings, Belt Packing, Dovetail, etc.) are typically inconsistent and inadequate.

PP Seal

The "PP" seal (Plastic Packed seal) can be used in non-critical applications in which wide temperature variations are not anticipated and experienced service personnel are available to regularly provide routine maintenance to monitor packing pressure and re-energize the seal. The seal is externally re-energized via a plastic injection port. It can be provided in a single or double configuration.

Compression Packing

The externally energized wire mesh shaped compression packing design was developed by FMC to replace conventional slab or sandwich style packing for applications up to 15,000 psi working pressure.
The wire mesh compression packing incorporates shaped wire mesh anti-extrusion rings that encapsulate the elastomeric seal element. The wire mesh rings also aid the packing during thermal expansion/contraction by providing stored energy, like a spring, to keep the seal energized.