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An elbow is a pipe fitting which is used as a connection point between two lengths of pipes to produce a change in the direction of flow in the pipe, usually at an angle of 90°, 45° or 180°. Elbows are also commonly referred as bends, and are available in a range of materials such as stainless steel, carbon steel, alloy steel, nickel alloys, duplex, and cupro nickel.

 

Also known as 90° bends, 90° elbows are manufactured as SR (Short Radius) elbows and LR (Long Radius) elbows. 45° elbows are typically made as LR (Long Radius) elbows.

 

The long radius elbows have a center to end distance that is 1.5 times the NPS in inches (R=1.5D), while the short radius is equal to the NPS in inches (R=1.0D).=Short radius elbows are generally used in tight areas, and long radius elbows are used when space is available and flow is more critical. We can also manufacture and supply carbon steel elbows and stainless steel elbows in non-standard size angles such as 60°, 100°, 120° or 150°.

 

The ends may be machined for butt welding, threaded (usually female), or socketed, etc. When the two ends differ in size, the fitting is called a reducing elbow or reducer elbow.

 

Walang hirap Elbow Manufacturing Process (Heat Bending & Cold Bending)

Isa sa mga pinaka-karaniwang pamamaraan para sa manufacturing elbows ay gumagamit ng mainit na mandrel bending mula sa tuwid na asero pipe. Pagkatapos ng pag-init ng bakal pipe sa isang mataas na temperatura, ang pipe ay hunhon, pinalawak, liko sa pamamagitan ng panloob na mga tool ng mendril hakbang-hakbang. Paglalapat ng mainit na mandrel bending ay maaaring paggawa ng isang malawak na hanay ng laki magkatugmang elbow. Ang mga katangian ng mandrel bending ay Matindi ang nakasalalay sa mga mahalagang hugis at sukat ng mga mandrel. Ang paggamit ng mga pakinabang ng mainit bending elbows isama ang mga mas maliit na kapal lihis at mas malakas na baluktot radius kaysa sa iba pang uri baluktot na paraan. Samantala, gamit ang baluktot sa halip ng mga gawa na bends malaki binabawasan ang bilang ng mga welds kinakailangan. Ito binabawasan ang dami ng trabaho kinakailangan at pinatataas ang kalidad at usability ng mga pipes. Gayunman, malamig baluktot ang proseso upang baluktot ang tuwid na steel pipe sa normal na temperatura sa isang baluktot machine. Malamig baluktot ay angkop para sa pipe na may isang panlabas na diameter ng 17.0-219.1 mm, at pader kapal 2.0-28.0 mm. Ang inirerekumendang liko radius ay 2.5 x Do. Karaniwan sa isang baluktot radius ng 40D. Sa pamamagitan ng paggamit malamig baluktot, maaari naming makakuha ng maliit na radius elbows, ngunit kailangan namin upang mag-impake ang internals may buhangin upang maiwasan ang wrinkling. Malamig baluktot ay isang mabilis at murang baluktot na paraan. Ito ay isang competitive na opsyon para sa paggawa ng pipelines at mga bahagi machine.

Welded Elbow Manufacturing Process (Maliliit na & Malaking)

Welded elbows are made from the steel plates, so it is not seamless steel elbows. Use a mould and press the steel plate to the shape of the elbow, then weld the seam to be a finish steel elbow. It is the old production method of the elbows.  Recent years the small sizes elbows are almost manufactured from the steel pipes now. For the big size elbows, for example, it is very difficult to produce elbows over 36'' OD from the steel pipes . So it is commonly made from the steel plates,  pressing the plate to the shape of half elbow, and welding the two halves together.  Since the elbows are welded in its body , the inspection of the welding joint is necessary . Commonly we use the X-Ray inspection as the NDT.