China Shenzhen Wofly Technology Co., Ltd. Company News

1. Nitrogen pipeline construction should follow the specifications “Specification for industrial metal pipeline engineering and acceptance” “Oxygen station design specification” “Regulations on safety management and supervision of pressure pipelines” “Specification for degreasing engineering and acceptance” “Specification for construction and acceptance of welding engineering of field equipment and industrial pipelines” 2. Pipeline and accessories requirements 2.1 All pipes, pipe fittings, and valves must have ex-factory certificates. Otherwise, check the missing items and their indicators should meet the current national or ministerial standards. 2. 2 All pipelines and accessories should be visually inspected, such as whether there are defects such as cracks, shrinkage holes, slag inclusions and heavy leather to ensure that the surface is smooth and clean; for the valves, strength and tightness tests should be carried out one by one (the test pressure is the nominal pressure 1.5 The pressure holding time is not less than 5 minutes); the safety valve should be debugged more than 3 times according to the design regulations. 3. Pipe welding 3.1 In addition to meeting the requirements of the drawings, the welding technical conditions should be carried out in accordance with international regulations. 3.2 The welds should be inspected by radiographic or ultrasonic in accordance with the specified quantity and quality level. 3.3 Welded carbon steel pipes should be backed with argon arc. 4. Pipeline degreasing and rust removal Use sandblasting and pickling to remove rust and degrease the inner wall of the pipeline. 5. Precautions for pipe installation 5.1 When the pipeline is connected, it must not be forcefully matched. 5.2 Check the straightness of the butt connector of the nozzle. Measure port at a distance of 200mm. The allowable deviation is 1mm/m, the total length deviation is less than 10mm, and the connection between the flanges should be parallel. 5.3. Use threaded connectors to apply PTFE with packing, and it is forbidden to use sesame oil. 5.4. The pipe and the support should be separated by a non-chloride ion plastic sheet; the pipe through the wall should be sleeved, and the length of the sleeve should not be less than the wall thickness, and the gap should be filled with non-combustible materials. 5.5. The nitrogen pipeline should have lightning protection and electrostatic discharge grounding devices. 5.6. The depth of buried pipeline is not less than 0.7m (the top of the pipeline is above the ground), and the buried pipeline should be treated with anticorrosion. 6. Pipeline pressure test and purge After the pipeline is installed, conduct a strength and tightness test, and the regulations are as follows: Working pressure MPa Strength Test Leak Test Media Pressure（MPa） Media pressure（MPa）

  1.Steps According to the elevation datum given by the civil engineering, mark the elevation datum line on the wall and foundation column where the pipeline needs to be installed; install the pipeline bracket and hanger according to the drawing and number; install the pipeline according to the pipeline installation drawing and the prefabricated number of the pipeline; Adjust and level the slope of the pipe, fix the pipe support, and position the pipe. 2.Request The slope direction and gradient of the pipeline should meet the design requirements; the slope of the pipeline can be adjusted by the metal backing plate under the support, and the hanger can be adjusted by the boom bolt; the backing plate should be welded with the embedded parts or steel structure, It should not be caught between the pipe and the support. Flanges, welds and other connecting parts should be arranged for easy inspection and repair, and should not be close to the wall, floor or pipe frame. When the pipeline traverses the floor slab, a protective tube shall be installed, and the protective tube shall be 50mm above the ground. When the pipeline traverses the floor slab, a protective tube shall be installed, and the protective tube shall be 50mm above the ground. The form and elevation of the support and hanger should conform to the requirements of the drawings, and the fixing position and fixing method should conform to the design and be flat and firm. Rows of horizontal or vertical pipelines should be neat, and the valve installation positions on the rows of pipelines should be consistent.       3.Installation Pipeline installation is divided into systems and pieces. The main pipe first, then the branch pipe. The branch pipe from the main pipe should be installed after the main pipe is positioned. Century Star introduced that the pipeline connected to the equipment must be carried out after the equipment is leveled. The flange connection should be concentric with the pipeline, and the flanges should be parallel. The deviation should not be more than 1.5% of the outer diameter of the flange and not more than 2mm. The bolt holes should ensure that the bolts can penetrate freely, and the bolts should not be penetrated by forced methods. . The two planes of the gasket should be flat and clean, and there should be no radial scratches. Flange connection should use bolts of the same specification, and the installation direction should be the same. When gaskets are needed, each bolt should not exceed one, and the bolts and nuts after tightening should be flush.  

  Wofly will introduce the valve parts commonly used in the gas pipeline control system.   Safety valve: it is normally closed under the action of external force and is the disc part of the system.When the medium pressure in the equipment or pipeline rises beyond the specified value, the medium pressure in the pipeline or equipment can be prevented from exceeding the specified value by discharging the medium outside the system.The safety valve is an automatic valve, which is mainly used for boilers, pressure vessels and pipelines. The control pressure does not exceed the specified value, which plays an important role in protecting personal safety and equipment operation. The safety valve can only be used after pressure test.   Pressure Regulator:pressure reducing valve(also known as reduced pressure regulator valve), pressure reducing valve is a valve in the body of the opening of the disc of regulating the flow of medium, the medium pressure is reduced, at the same time with the aid of the role of the valve after pressure adjust the opening of disc part, keep the valve after pressure within a certain range, under the condition of the inlet pressure changing, keep the outlet pressure within the scope of the set. And protect the means of production behind it.       Pressure Reducer (Pressure Reducing Valve): the pressure reducer is a valve that reduces the inlet pressure to a required outlet pressure through regulation, and automatically keeps the outlet pressure stable by relying on the energy of the medium itself. From the perspective of hydrodynamics, the pressure reducer is a throttling element whose local resistance can be changed, that is, by changing the throttling area, the flow rate and kinetic energy of the fluid can be changed, resulting in different pressure losses, so as to achieve the purpose of pressure reduction. Then, depending on the regulation of the control and regulation system, the fluctuation of the pressure behind the valve is balanced with the spring force, so that the pressure behind the valve remains constant within a certain error range.   What valve parts of gas pipeline engineering will be introduced here first. Gas pipeline includes control valves, filters, pressure reducing devices, pressure gauges, flowmeters, online analyzers, etc., which should be concentrated in the gas inlet chamber.