【 Weak current College 】 common pipeline attachment basics

(A) screwed pipe fittings
Screwed pipe fittings-galvanized and not galvanized, generally are malleable cast iron manufacture. Common thread connecting fittings are fittings for two pipes of connection and other fitting connection; reducer (size head), used to connect two different pipe diameter; equal diameter and reducing tee, equal diameter and reducing cross for two pipes plane vertical cross connection; live connector for regular demolition of pipelines.

(2) flange, bolts and gaskets
Flange connection including upper and lower flange, gaskets and bolt nut three parts.
1, flange.
Flanges according to their structure and pressure differences can be divided into the following:

(1) flat welding flange. Flat welding flange is low pressure pipe of the most common one. Flat welding flange is suitable for nominal pressure not exceeding 2.5MPa.

(2) welding neck flange. Welding neck flange is also known as high neck flanges. Its intensity big, difficult to deformation, better sealing performance. Welding neck flange is divided into the following forms:

L) smooth-welding neck flange.
2) bump sealing face welding flange.
3) mortise seal face welding flange.
4) trapezoid trough sealing face welding flange.

(3) the spout flanging activities flanges. Pipe outlet flange to flange, used for the activities of steel, aluminum and other nonferrous metal and stainless steel pipe, the advantage is you can save precious metals, at the same time as the flange can be freely, flange wear is very convenient, when the screw is not able to pressure. Applies to the following pipe connection 0.6MPa.

(4) welding flange ring activities. Welded flange ring activities used in the pipe wall thickness of the stainless steel tube compared and easy-to-flange of non-ferrous metal pipe to the flange connection. Its sealed surface is smooth and tenon trough two.

(5) threaded flanges.

2. gasket

(1) rubber asbestos gasket. Rubber asbestos mat is flanged dosage most gasket, can apply to a lot of media, such as steam, gas, air, water, acid and alkali, etc.
(2) rubber mat. Commonly used to transfer low pressure water, acid and alkali medium such as a pipe flange connections.
(3) spiral wound gaskets. In the petrochemical process pipeline is widely use.
(4) tooth-shaped cushion. Commonly used to bump-and-seal flange connection. Profile of bedding material with ordinary carbon steel and low alloy steel and stainless steel, etc.
(5) metal gaskets.
(6) plastic mats. Plastic mat suitable for transporting various corrosive pipeline flange connection. Common plastic gasket with PVC gaskets, PTFE gasket and PVC gaskets, etc.

3, flange bolts

For the connecting bolt, a single head bolts and studs, the thread is usually coarse thread triangle metric.

(3) press fittings and welding pipe fittings

Construction use finished elbow into seamless elbow punching, stamping and welding elbow and welded elbows.

(4) blowing connector
Blowing connector (the rubber tube activities), there are two connection form:
(1) connector on one end and hose connected at one end and threaded valve.
(2) connector on one end and hose connected to the other side of the pipe is connected.

(5) head
For closed at the end of pipe fittings, flat shape and oval.
(1) flat head. Flat head suitable for low pressure tanks.
(2) oval head. Also known as caps, suitable for a large low pressure, medium pressure pipe.

(6) convex
Also known as the nozzle is controlled instrument in the process pipeline of disposable parts, used for connection managers, and other components.

(VII) blind plate
For temporary (permanent) to cut off pipeline fittings of the media. Depending on the flange seal surface with smooth surface blind plate, convex blind plate, trapezium fluted sides blind plate and 8 words blind plate (also divided into smooth surface, jogs, trapezium fluted surface three).