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Connection Types and Nomenclature


FCI connections are available in a wide variety of seamless configurations for use in pressure vessels and piping systems.

Standard connections are available in the complete range of sizes and pressure rating classes covered in ASME B16.5. Conditions of service, space factors, fabrication facility, correlation of piping, ladders and decks/platforms, vessel internals, and other considerations determine connection configurations. The amount of reinforcement required from a pressure vessel connection can vary significantly in each application thereby determining the connection neck thickness. 

Standard connections sold by FCI are manufactured in accordance with ASME Section VIII Div. 1 and ASME B16.5 latest edition. Upon request, connections can be manufactured in accordance with ASME Section VIII Div. 2 latest edition and/or other Codes and Purchaser specifications. Materials of construction will be in compliance with the respective Code.

Long weld neck connection forging

The Long Weld Neck "LWN" connection is the lightest and most economical of FCI standard connections I offered for use where a minimum of reinforcing area is required. Long Weld Necks have a uniform barrel outside diameter that provides a nut relief clearance between the connection neck and the nut. Lengths can be increased to allow for any offset, "hillside" or tangential location attachment on pressure vessel shells or heads. Contoured bottoms are available upon request. 


HEAVY BARREL "HB" CONNECTIONS Pressurized Vessel Connections Manufacturer

The FCI Heavy Barrel "HB" connection provides
additional reinforcement than the Long Weld Neck by
means of a thicker barrel/wall section. "HB" connections
have a uniform barrel outside diameter in order to
provide an automatic nut stop against the barrel, thereby eliminating the need for a holding wrench on the
connection side. A nut relief in the barrel is optional upon request. Type "HB" connections 12" and less have Sch. 80 bores as standard; in sizes 14" and greater, bores are equal to nominal pipe sizes. Special bores are available upon request. Larger outside diameter/thicker barrels and contoured bottoms are available upon request.

ASME pressure vessel connections manufacturing

FCI Intermediate Barrel "I" connections, I1, I2 and I3,
provide three (3) standard intermediate barrel
connections having progressively larger outside
diameter barrels to provide added reinforcement greater than that of the "HB" connections and less than the Equal Barrel "E" connection. Within the flange hub area, the outside diameter of the barrel provides an automatic nut stop, but the remaining portion of the barrel is larger in outside diameter providing additional reinforcement. Intermediate Barrel "l" connections 12" and smaller have Sch. 80 bores as standard; in sizes 14" and greater, bores are equal to nominal pipe sizes. Barrel nut relief, special bores
and contoured bottoms are available upon request.

Pressurized Vessel Connections Manufacturer

The FCI Equal Barrel "E" connection provides the most reinforcement of all standard connections produced by FCI. The barrel outside diameter equals the outside diameter of the bolting flange. Within the flange hub area, the outside diameter of the barrel provides an automatic nut stop. A nut relief in the barrel, special bores and contoured bottoms are available upon request.



SUPER BARREL "SB" CONNECTIONSASME pressure vessel connections manufacturing

The FCI Super Barrel "SB" connection is identical to the Equal Barrel "E" connection with the exception of the barrel outside diameter exceeding that of the bolting flange to provide additional reinforcement when required for an integrally reinforced connection. A nut relief in the
barrel, special bores and contoured bottoms are
available upon request. Purchaser to advise barrel
outside diameter for required reinforcement.                                                                                     

Pressurized Vessel Connections Manufacturer

Insert Lips are available on all connections. The letter "Q" appended to the above connection designations indicates an insert lip. For example, |3Q designates an Intermediate Barrel type 3 connection with an insert lip. Purchaser to advise insert lip details.
Insert lips offer: 

  • ease and economy of installation,
  • easier and less expensive weld inspections,
  • superior toughness and ductility in high stress areas.

Butt weld connection manufacturer

The Butt Weld Stub End connection outside diameter can be identical to any of the above mentioned connections. Ends may be plain and square or:

  • one end faced and tapped, 
  • one end tapered and with weld groove preparation to ASME B16.25, contoured as specified by Purchaser, 
  • one end prepared for a pipe butt weld connection, other end (reinforced barrel end) , either flat or contoured to fit any shell or head , mount, 
  • both ends prepared for butt welding — used as a I seamless shell section.

Purchaser to advise all dimensional sizing. Seamless forged rings and cylinders can be manufactured for custom high pressure components as per Purchaser's design.


ASME pressure vessel connections manufacturingStudding Outlets provide a unique compact design with inherent reinforcement offering distinct advantages to designers and fabricators. The low profile of this connection provides for the lowest projection of a bolted connection where clearance may be a factor in connection selection. The outside diameter and/or body thickness may be increased where additional reinforcement is required. In addition, the Studding Outlet can be supplied with an optional contoured bottom and/or insert lip for simplified installation and reduction in cost of positional welding. Other common Studding Outlet options are air test holes, top or side connecting, special gasket surface faces, and custom machining of the mating surface to accommodate sight glass assemblies. The Studding Outlet is the most economical of bolted connections.


Large diameter flanges and blind flanges are produced Pressure vessel components manufacturer
in accordance with ASME B16.47 Series A and Series B
for sizes NPS 26" to NPS 60" in pressure/temperature
rating classes 75 through 900. Dimensional standards l
generally conform to both MSS SP44 (B16.47 Series A)
and API 605 (B16.47 Series B). FCI can furnish flanges
and blinds that meet other dimensional specifications E
upon request, when the Purchaser accepts
responsibility for verifying that the flange geometry is
suitable for the design conditions.

Contact Pressurized Vessel Connections Manufacturer, Forged Components

To receive more information about Long Weld Neck connection forging and more, please request a quote or call (281) 441-4088 to speak to a Forged Components representative that can answer all of your questions. You can also send us an email at