High Pressure Access Fitting Bodies are available in styles that may be welded (Flareweld, Socketweld, and Buttweld), threaded (NPT), or flanged (API, ANSI RF, ANSI RJ) to the pipe or vessel wall. Basic body styles are shown in the HP™ Access Fitting Bodies and the MH™ Access Fitting Bodies sections.
Flareweld bodies are the most widely used. These bodies incorporate a reinforced welding neck and also have a radius machined into the base to accommodate the curvature of the pipe or vessel to which the body is welded.
Access fittings are manufactured from materials which conform to NACE MR-0175 specifications for sour service. Choice of material for the access fitting body is based on minimum operating temperature as well as process stream corrosivity. "Standard" temperature materials are suitable for use above a minimum operating temperature of -20°F (-29°C). "Low Temperature" materials should be selected for minimum operating temperatures below this value.
The Metal Samples standard material specification for Flareweld Socketweld, Buttweld, and NPT bodies is AISI 1018 for standard temperature and ASTM A350LF2 for low temperature. For flanged fittings, ASTM A105 is used for standard temperature and ASTM A350LF2 for low temperature. However, all access fitting components can be made to order in any customer-specified material; carbon or stainless steel, duplex materials, or other more exotic alloys.
All access fitting bodies have an external 3-inch ACME thread, which is used to attach the service valve during retrieval operations. Access fitting bodies should always be fitted with a cover which is designed to protect both external thread and also the service valve sealing surfaces.
Tee Type Access Fitting Bodies
Tee type access fitting bodies are available for use in applications where inlet or outlet access to the process stream is required.
A side-tee port is drilled and tapped in the access fitting’s extra thick body to provide an integral connection point for a nipple and shut-off valve arrangement. Fittings with 1/4", 1/2", 3/4", or 1" FNPT side-tee ports are available as standard items.
Tee type access fitting bodies are used with Chemical Injection Systems, Sampling, and Sand Monitoring Systems. If required, the side-tee port may be sealed off with a pipe plug. This would allow devices normally used with the non-tee type access fittings to be used with the tee type access fittings. NOTE: The installation and removal of the pipe plug requires the process stream to be shut down and depressurized.
The materials of construction of tee type access fitting bodies is the same as the non-tee type access fitting bodies. Flanged tee type access fittings are also available upon request.