Pipe Fittings | Flanges

Welding Neck Flange

This type of flanges is designed with a tapering hub on the backside of flanges that that will match the pipe to which it will be welded. These type of flanges are bored to match the inside diameter of the mating pipe so there will be no restriction of product flow. Weld Neck flanges also provide excellent stress distribution through the tapered hub and are easily radiographed for flaw detection.

Lap Joint Flange

This type of flanges are used in conjunction with a "Lap Joint Stub End," these flanges are nearly identical to a slip-on flange with the exception of a radius at the intersection of the flange face and the bore to accommodate the flanged portion of the stub end.

Socket Welding Flange

This group of flange is similar to slip-on flange, except there is a bore and a counter bore. The counter bore is slightly larger than the Outer Diameter of the matching pipe, allowing the pipe to be inserted. A restriction is built into the bottom of the bore, which acts as a shoulder for the pipe to rest on, and has the same ID of matching pipe. The flange is then attached to the pipe by a fillet weld at the hub. Welded socket type flanges are typically used in chemical processes, hydraulic lines and steam distribution lines and for high pressure system.

Slip-On Flange

This type of flange is bored slightly larger than the outer Diameter of the matching pipe. The pipe slips into the flange prior to welding both inside and outside to prevent leaks. Slip on flanges are attached to the pipe by fillet welding at the hub and at the end of the pipe inside the flange.

Threaded Flange

These flanges are threaded in the bore to match an external thread on the pipe. The threads are tapered to create a seal between the flange and pipe as the tapers approach the same diameter. These flanges are normally designed for low pressure, non-cyclic applications. Threaded flanges are also used in applications where welding is hazardous.

Blind Flange

Blind flanges are manufactured without a bore and used as closures or seals for the ends of piping systems. They are also used for man hole covers for pressure vessels. This type of flanges is provided with or without a hub, depending on customer requirements. Under pressure and bolt loading, the blind flange is counter more stresses than any other flange type. The maximum stresses are bending stresses at the center and are easily absorbed by the flange.

Orifice Flanges

Orifices flanges are designed for flow metering systems. Combination of two of these flanges with bolts and jack screws are called an orifice mounting flange. A orifice is installed in between these two flanges. This type of flange is provided with a pair of pressure taps for measurement of pressure drop in the flow through the orifice plate. Orifice flanges may be provided in one of three types of flanges: Welding Neck, Slip-On and Threaded.

Plate Flange

Plate flanges are a widely accepted and cost effective alternative to forged or cast flanges in low pressure applications. Over the years, a number of standards have been applied to the production of steel plate flanges.

Our plate flange product line includes standard and non standard flanges from 31/2" to 200" in diameter produced to all applicable standards.