How to make metal pipe connections in clean rooms? -common problem

How to make metal pipe connections in clean rooms?

The welding of clean room steel pipes is generally electric welding and gas welding, most of them are electric welding, only when the thickness of the pipe wall is less than 4mm, the gas welding connection is used; the gas welding connection generally adopts the butt welding type, and the welding port is generally welded with two layers, each layer Try to finish welding at one time to reduce joints, apply...

Text label: clean room installation engineering, metal pipe connection

How to connect metal pipes in clean room?

The welding of clean room steel pipes is generally electric welding and gas welding, most of them are electric welding, only when the thickness of the pipe wall is less than 4mm, the gas welding connection is used; the gas welding connection generally adopts the butt welding type, and the welding port is generally welded with two layers, each layer Try to finish welding at one time to reduce the number of joints. In order to prevent welding defects during welding, pay attention to exhaust the gas in the welding pool; for pipes connected with threads, the threads should be clean, regular, and the broken or missing threads should not exceed the number of full threads. 10%, the connection is firm, the exposed thread at the root of the interface is 2-3 buttons, and there is no exposed filler; the galvanized layer of the clean clean room modular galvanized pipe should be protected, and the local damage should be treated with anti-corrosion; Wrap twine or sealing tape on the head or pipe fitting, and screw it into the pipe fitting with internal thread 2-3 pitches by hand; for flanged pipes, the flange surface should be perpendicular and concentric with the center line of the pipe, and the flanges should be connected to each other. Parallel, the deviation should not be greater than 1.5/1000 of its outer diameter, and should not be greater than 2mm, the length of the connecting bolts should be the same, the nuts should be tightened evenly on the same side, the bolts should not be lower than the nut plane after tightening, and the gasket specifications of the flange , variety and thickness should meet the design requirements.

In addition to the use of flanges at the connecting equipment, valve parts and instruments on the pipeline, it is not allowed to arbitrarily add or cancel the designed flange connection in the pipeline; for flat welding flanges, the flange is sleeved into the pipe end to make the pipe mouth Enter 1.5 times the thickness of the pipe wall within the flange sealing surface, and evenly divide four points on the inner circumference of the flange; for spot welding of pairs of flanges, the alignment between the bolt holes should be accurate, using the hanging wire method, after two passes After the inspection shows that the electric welding is qualified, the fillet welding connection between the flange and the pipe can be carried out. After welding, the inner and outer welds of the pipe should be cleaned, and no debris should be left on the sealing surface of the flange; butt welding flange and The connection of the pipe adopts butt welding. The inspection of the verticality of the flange sealing surface and the center line of the pipe, the alignment method and the alignment of the screw holes are basically the same as those of the flat welding flange. For metal pipe groove connection, first check the end of the processed steel pipe. During the installation process, use lubricant to evenly coat the edge and outside of the gasket, put the sealing ring on the end of the steel pipe, and ensure that the edge of the sealing ring does not exceed the end of the pipe; The pipe and the pipe fitting are butted on a straight line, and the two ends are butted, and then the sealing ring is moved so that it cannot cover or block the groove to the center position between the two grooves. Make sure that the edge of the joint is in the groove, insert the bolt and then put on the nut, and tighten the nuts on both sides evenly, so that the two ports of the joint are tightly joined together. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean rooms and clean workshops.

The steel pipe is aligned in the groove, and the qualified pipe should not be rotated after spot welding. The welding feature is that the flat and overhead welding are the boundaries, and the annular welding joint is divided into two symmetrical semicircular welding joints. → Flat welding sequence welding; during overhead welding, in order to make the molten iron melt into the groove and join the base metal well, it mainly depends on the arc blowing force. If the blowing force is not enough, the droplet will be transported to the molten pool. The power of the arc will be weakened, so only increasing the current intensity can increase the arc blowing force, but if the current is too large, the area of u200bu200bthe molten pool will increase, and the molten iron will easily fall, so a suitable current must be used. When welding the root, the overhead welding and flat welding parts are more difficult to operate. Usually, the back of the overhead welding part is not fully welded or prone to dents, and the surface has defects such as welding bumps, bites, and slag inclusions due to the falling iron water, and the flat welding parts are prone to welding. It is not transparent and the iron water falls to form weld flashes. When the pipe diameters on both sides of the opposite side are not equal, the pipe with the smaller diameter can be placed below, and ensure that the number of misalignments along the circumferential direction is equal, otherwise there will inevitably be a bite defect at the root. When the misalignment is greater than 2mm, it must be processed. Its inner diameter is the same, and its processing slope is 1:5; when welding pipes with larger diameters, such as continuous transportation along the circumference, the deformation will be larger, and the reverse segment jump welding method must be used for welding; Alignment, the end face of the pipe should be perpendicular to the axis of the pipe. Before welding, the rust should be removed within 10mm of the groove and both sides until the metal luster is exposed; when multi-layer welding, the joints of each layer of welds should be staggered by 20-30mm .

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