1. Compression Fitting Connections - Pressure Range: 250 – 800 Bar; Applicable Steel Pipe Size Range: 4 – 42 mm; Applicable Materials: Carbon Steel and Stainless Steel.
The ferrule type pipe joint consists of three parts: the joint body, the ferrule, and the nut. When the ferrule and the nut sleeve are inserted into the joint body on the steel pipe, when the nut is tightened, the outer side of the front end of the ferrule fits the conical surface of the joint body, and the inner edge evenly bites into the seamless steel pipe to form an effective seal.
Advantages: widely used and mature; parts are relatively low-priced; no special machines are required.
Disadvantages: only suitable for pipeline connections below 42mm; not suitable for thin-walled pipes; large installation space and torque are required for installation; not suitable for working conditions with high safety requirements; cannot be used for strong vibration, shock and pulse working condition.
2. JIC 37 degree joint connection - Pressure range: 420 Bar (250 Bar, 100 Bar); Applicable steel pipe size range: 6 – 38 mm; Applicable materials: carbon steel, stainless steel, brass, copper alloy, etc.
The JIC37 degree joint connection consists of three parts: joint body, bushing and nut. When the bushing and the nut are inserted into the steel pipe, the pipe end of the steel pipe is flared and formed with a flaring device, and then the joint body and the nut are tightened, and the contact surface of the cone is rigidly sealed and the O-ring is sealed.
Advantages: widely used and mature; wide range of applicable materials; simple and convenient installation; repeatable disassembly and assembly.
Disadvantages: only suitable for pipeline connections below 38mm; low nominal pressure (except DNV standard); not suitable for thick-walled pipes; need to form the end of the flaring equipment.
3. End forming connection (Walform) - Pressure range: 250 – 800 Bar; Applicable steel pipe size range: 4 – 42 mm; Applicable materials: carbon steel, stainless steel, copper alloy, etc. [3]
Walform connections are an alternative to compression fittings. After the female sleeve is inserted into the steel pipe, it is automatically extruded and formed at the pipe end of the steel pipe with the forming equipment. After the sealing ring is installed, the joint body and the nut are tightened, and the rigid seal of the joint body and the forming surface and the sealing ring are used to seal.
Advantages: low torque and safe installation; fast and simple production process; advanced technology and no leakage; repeatable disassembly and assembly.
Disadvantages: Only suitable for pipeline connections below 42mm; need to form the end of the forming equipment.
4. Socket Welded Connections - Pressure Range: 420 Bar (Small Pipe Diameter Only); Applicable Steel Pipe Size Range: 6 – 150 mm; Applicable Materials: Carbon Steel and Stainless Steel.
The socket welding connection is to extend the pipe into the valve body for welding, and the shape is similar to the internal thread connection after forming.
Advantages: Wide range of applications; low price of components; advanced technology and no leakage; simple connection method for low-voltage systems.
Disadvantages: Requires skilled welding workers; requires welding equipment, good ventilation and fire prevention measures; requires special cleaning and anti-corrosion treatment; will cause environmental pollution.
5. Butt Welded Connections - Pressure Range: 500 Bar (Small Pipe Diameter Only); Applicable Steel Pipe Size Range: 6 – 608 mm; Applicable Materials: Carbon Steel and Stainless Steel.
There are butt welding flange connections and butt welding head connections.
Advantages: Wide range of applications; low price of parts; advanced technology and no leakage; simple pipe-to-pipe connection.
Disadvantages: Requires skilled welding workers; requires welding equipment, good ventilation and fire protection measures; requires special cleaning and anti-corrosion treatment; can cause environmental pollution
