siku

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.

 

Proses lancar siku Manufacturing (haba Bending & Cold Bending)

Salah satu kaedah yang paling biasa untuk siku pembuatan menggunakan mandrel panas lenturan daripada paip keluli lurus. Selepas pemanasan paip keluli pada suhu tinggi, paip ditolak, berkembang, bengkok oleh alat dalaman mandrel langkah demi langkah. Menggunakan mandrel lentur panas boleh mengeluarkan pelbagai saiz siku lancar yang luas. Ciri-ciri mandrel lenturan adalah sangat bergantung kepada bentuk yang penting dan dimensi mandrel. Menggunakan kelebihan siku dibengkokkan panas termasuk sisihan ketebalan lebih kecil dan jejari lentur kuat daripada yang lain jenis kaedah lenturan. Sementara itu, dengan menggunakan lentur bukannya selekoh pasang siap dengan ketara mengurangkan bilangan kimpalan diperlukan. Ini akan mengurangkan jumlah kerja yang diperlukan dan meningkatkan kualiti dan kebolehgunaan paip. Walau bagaimanapun, sejuk lentur adalah proses untuk bengkok paip keluli lurus pada suhu normal dalam mesin lentur. lenturan sejuk sesuai untuk paip dengan diameter luar 17,0-219,1 mm, dan dinding ketebalan 2,0-28,0 mm. Jejari lentur disyorkan ialah 2.5 x Do. Biasanya pada jejari lenturan 40D. Dengan menggunakan lenturan sejuk, kita boleh mendapatkan siku jejari kecil, tetapi kita perlu untuk membungkus dalaman dengan pasir untuk mengelakkan kedutan. lenturan sejuk adalah satu kaedah lenturan cepat dan murah. Ia adalah pilihan yang berdaya saing untuk membuat paip dan bahagian-bahagian mesin.

Dikimpal Proses siku Manufacturing (Kecil & Besar)

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.