Connection method of large diameter spiral steel pipe (SSAW):
The common connection method of large-diameter spiral steel pipe is welding, but in some projects, threaded connection, flange connection, socket connection, groove connection and other forms are often used.
1. Welding, flange connection
Welding and flange connection are traditional spiral steel pipe connection methods, which are far from meeting the market demand in terms of safety, sealing performance, cost space, and emergency repair efficiency.
Scope of application:
Water pipeline connection, oil and natural gas pipeline connection, chemical pipeline connection, power pipeline connection.
2. Connection of grooved pipe fittings
Grooved pipe connection technology, also known as clamp connection technology, has become the first technology for liquid and gas pipeline connections. Although this technology was developed later in China than abroad, due to its advanced technology, it was quickly adopted by accepted by the market. The application of grooved pipe connection technology makes the complex pipe connection process simple, fast and convenient. A big step forward in plumbing technology.
Grooved fittings include two broad categories:
①The pipe fittings that play the role of connection and sealing include rigid joints, flexible joints, mechanical tee and grooved flanges;
②The pipe fittings that play the role of connection and transition include
elbow, tee, cross, reducer, blind plate, spiral welded pipe, etc. The groove connection pipe fittings that play the role of connection and sealing are mainly composed of three parts: sealing rubber ring, clamp and locking bolt. The rubber sealing ring located on the inner layer is placed on the outside of the connected pipe, and fits with the pre-rolled groove, and then a clamp is fastened on the outside of the rubber ring, and then fastened with two bolts. Due to the unique sealable structure design of its rubber sealing ring and clamp, the groove connection has good sealing performance, and with the increase of fluid pressure in the pipe, its sealing performance is correspondingly enhanced.
Groove connection makes the operation of pipeline connection simple, which is beneficial to construction safety, good system stability, convenient maintenance, labor saving and time saving, so it has good economic benefits. With clamp connection, although the price of a single part of the clamp is higher, the overall benefit of the entire pipe network installation is higher than that of flange connection.
Scope of application:
Liquid and gas pipeline connections.
3. Clamp pipe connection
As an advanced pipe connection method, the clamp pipe fitting connection can be either exposed or buried, including both steel joints and flexible joints. Therefore, it has a broad scope of application.
According to the system: it can be used in fire water system, air conditioning cold and hot water system, water supply system, petrochemical pipeline system, thermal power and military pipeline system, sewage treatment pipeline system, etc.
According to the pipe material: it can be used to connect steel pipes, steel pipes, stainless steel, plastic-lined steel pipes, ductile iron pipes, thick-walled plastic pipes and soft valves with steel pipe joints and flange joints.
Scope of application:
Water pipeline connection, oil and natural gas pipeline connection, chemical pipeline connection, thermal power and military pipeline connection.
