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Credibility ,Pipe fittings are widely demanded for virtually any piping and plumbing systems utilized in industrial and commercial applications. Pipe fittings allow pipes being joined or installed in the appropriate place and terminated or closed where necessary. Pipe fittings are available in various size and shapes. They can be expensive, require time, and other materials and tools to setup. They may be an essential part of piping and plumbing systems. There are lots of specialized fittings manufactured. Each type of pipe or tube requires its own type of fitting, but usually all pipe fittings share some common features. Pipe fittings can be purchased everywhere where plumbing materials can be bought.
Different Dimensional Standards available for pipe fittings:
ASME B 16.1-Cast Iron Pipe Flanges and Flanged Fittings
ASME B 16.3-Malleable-Iron Threaded fittings
ASME B 16.4-Grey Iron Threaded fittings
ASME B 16.5-Pipe Flanges and Flanged fittings
ASME B 16.9-Factory-Made Wrought steel Butt welding
ASME B 16.11-Forged Fitting, Socket welding and Threaded
ASME B 16.28-Wrought Steel Butt welding Short Radius Elbows and Returns
ASME B 16.42-Ductile Iron Pipe Flanges and Flanged Fittings
ASME B 16.49-Buttwelding Induction Bends for Transportation and Distribution System
BS 1640-Buttweld Fittings
BS 3799-Socket weld and Screwed end fittings
Pipe fittings classification based on the end connections:
Dimensional standard-AME B 16.11/BS 3799 Sizes –upto 4” NPS only.
These fittings are designated by pressure class which represents the maximum cold non-shock working pressure and the thickness corresponding to that class.
The pressure classes used to designate these fittings are:
2000 # Class: Applicable for Screwed fittings only, Thickness-SCH 80 or XS
3000 # Class: Socket weld fittings, Thickness-SCH 80 or XS & Screwed fittings, Thickness-SCH 160
6000 # Class: Socket weld fittings, Thickness-SCH 160 & Screwed fittings, Thickness-SCH XXS
9000 # Class: Applicable for Socket weld fittings only, Thickness-SCH X XS
The screwed ends for fitting are generally with Taper threads. These threads can be Nominal Pipe threads (NPT) or British Screwed Pipe Threads (BSPT).
The socket weld/screwed fittings are generally forged.
The different grades of material used for these fittings are:
ASTM A105-Forged Carbon Steel
ASTM A181-Forged Carbon Steel for General purposes
ASTM A182-Forged Alloy Steel and Stainless Steel
ASTM A234-Wrought Carbon Steel and Alloy Steel pipe fittings for moderate and elevated temperatures
ASTM A350-Forged Alloy Steel for Low temperature Services
How are pipe fittings connected to pipes?
Pipe fittings are either male fittings or female fittings. In threaded pipe fittings, female threads are on the inside while male threads are on the outside. Pipe fittings that have one female end and one male end are called street fittings. Pipe fittings are used to connect pipes or tubes in two ways:
Accordingly pipe fittings are organized as follows:
Purpose of a pipe fitting:
The basic purposes of any pipe fitting are as follows:
Selection criteria for pipe fittings:
Pipe fittings are to be chosen considering certain factors. They are as follows:
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Yaang Pipe Industry Co., Ltd. is an international supplier of piping solutions for flange, butt welding fittings, socket welding fittings and threaded fittings. Our products are widely used in different industrial fields, including oil and gas, chemical industry, petrochemical industry, power plant, pulp and paper industry, environmental and water conservancy engineering, engineering projects, etc.