Weldbend flanges
Manufactured by Weldbend Corporation, the leading manufacturer of carbon steel pipe fittings. Manufacured in sizes from one half inch through sixty inches (1/2” through 60”) and Classes 125, 150, 300, 600, 900, 1500, and 2500, Weldbend Flanges are known for their exceptional performance and reliability.
They are available in different types, including weld neck, slip-on, blind, and threaded flanges, and can be used in a wide range of applications, from oil and gas pipelines to industrial processes. Weldbend Flanges are known for their precision engineering, strict quality control, and adherence to industry standards, making them a trusted choice for demanding piping systems where safety and performance are paramount.
Weldneck
Information
The weld neck flange is normally referred to as the “high hub” flange. It is designed to transfer and equally distribute stresses to the pipe, thereby reducing any concentration of high stress at the bottom of the flange after connections are made. The weld neck flange is the best-designed flange for butt-welding because of its inherent strength. A long tapered hub and gradual transition of thickness in the region of the butt-weld joint adds reinforcement from the standpoint of strength and resistance to dishing. The smooth transition from the flange thickness to the pipe wall thickness effected by the taper is extremely beneficial under conditions of repeated bending caused by line expansion or other variable forces.
Weld neck flanges are used in severe services generally involving high pressure and sub-zero or high temperatures. Weld neck flanges are bored to match the I.D. (Inside Diameter) of the matching pipe. Therefore, the lighter (lower schedule) the pipe, the larger is the bore of the flange. The flange is bored to match the I.D. of the pipe after joining so there is no restriction in flow that could increase stream turbulence and contribute to metal erosion.
Material Grades & Size Range
Schedule: STD, XS, 40, 80, 160, XXS
Threaded
Information
A threaded flange is similar to the slip-on flange, but the bore is threaded. Its chief merit is that it can be assembled without welding. This feature makes it preferable for services operating at low pressures and ambient temperatures. Threaded flanges can be installed in highly dangerous areas where welding might be hazardous.
Threaded flanges are unsuited for extreme temperature conditions or bending stresses of any great magnitude. Widely fluctuating conditions could cause leakage
through the threads after only a few cycles of heating or repeated exposure to stresses. “Seal” welding around the joint is sometimes performed to overcome the possibility of leakage, but this is not always satisfactory, nor possible.
Material Grades & Size Range
Schedule: STD, XS, 40, 80, 160, XXS
Slip-on
Information
A slip-on flange has a low hub because the pipe slips into the flange prior to welding. It is welded both inside and out to provide sufficient strength and prevent leakage. Slip-on flanges are all bored slightly larger than the O.D. of the matching pipe. Their lower cost makes them preferable to weld neck flanges to many users. Installed cost is not much less than for a weld neck flange because of the additional welding involved.
Material Grades & Size Range
Schedule: STD, XS, 40, 80, 160, XXS
Lap Joint
Information
The lap joint flange is almost identical to a slip-on flange except for the radius at the intersection of the bore and flange face. This radius is necessary to accommodate connection to a lap joint stub end. Normally, a lap joint flange and a lap joint stub end are mated together. The lap joint flange and stub end assembly is used mainly in piping systems that are frequently dismantled for inspection or cleaning. These flanges are advantageous in systems where the ability to swivel flanges and align bolt holes simplifies erection of large diameter and hard–to-adjust piping.
Material Grades & Size Range
Schedule: STD, XS, 40, 80, 160, XXS
Blind
Information
The blind flange is a solid forging used to blank off the end of a piping system and for gaining access to interior of the line. These flanges from the stance of internal pressure and bolt load are the most highly stressed type of all. However, since the maximum stresses in a blind flange are bending stresses at the center, they can safely be permitted to be higher than in other types of flanges. Not apt for repeated severe water hammer or when temperature is a service factor, for these situations, a welding cap is better suited.
Material Grades & Size Range
Schedule: STD, XS, 40, 80, 160, XXS
Socket Weld
Information
Socket weld flanges were initially developed for use in small-size high-pressure piping. Slightly more expensive than the slip-ons, when provided with an internal weld, their static strength is equal to, but their fatigue strength is 50% greater than double-welded slip-on flanges.
Material Grades & Size Range
Schedule: STD, XS, 40, 80, 160, XXS
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