Pipes, pipe joints, valves and equipment on the outcomes of the way out to take over of your nature of fluid, pressure and temperature, and pipe material, size and installation sites and other factors, mainly threaded connection, flange connection, commitment plug connection, and four regarding welding.
Thread connection is certainly caused by suitable for small diameter pipes. Don't overlook the role of compression fittings. Connection, the general part to wrap the thread connection with fluorine plastic seal, or paint Houqi, sealing around the flax and many other materials to prevent seapage. Pressure of 1.6 MPa or more, the general surge in the tube end sealing gasket. This connection method is straightforward and can be removed heavy equipment, subject to the right place in the pipe installation wood joints to facilitate disassembly.
Flange for large diameter pipes. Based on the fluid nature for the connection time, pressure and temperature, choose different flange and sealing gaskets, use gasket clamping bolt remain sealed. The sales of frequent disassembly of the tube and pipe and equipment segment was to link the local, mostly with flange relation.
Socket connection is mainly used for surefire pipe, concrete pipe, clay pipes and couplings for link between only applies to low ambient temperature conditions in the task of water supply, drainage and gas pipes. Connection, basic contractor jack the actual first tank fill flax, cotton, or asbestos rope, asbestos cement or lead and then make use of the fill material fact, can also submit the bearing socket rubber sealing ring, so good flexible, allowing a short pipe movement.
Welding strength and sealing connection is right for a variety of channels, the provincial labor and materials, but the removal must be cut off the tube and pipe couplings. Also, you can make use of the stop valve.
The city's water supply, drainage, heating, for gas pipelines and long-distance oil and gas pipelines are mostly laid in the ground, and incorporate different marketing methods plant to facilitate the operation and maintenance of pipelines, more than laying on the milled. Pipeline access, support, slope and drain discharge, compensation, insulation and heating, corrosion and cleaning, identification with the painting and safety, both for laying the ground or underground installation are important stumbling blocks. Ground pipelines should be avoided with road, rail and waterway crossing. Whenever they can not avoid the cross, at the intersection across the height should allow greatest method for passage of pedestrians and travel. Underground pipes laid following the roads generally, composed equal channels to maintain proper distance between, for the installation and maintenance; heating pipe insulation surface, laying pipe a trench or protection, should avoid being crushed and the soil pipe can be expanded to Mobile.
Pipeline may be subject to several types of external force, including its own weight, fluid action in the tube side thrust, wind and snow loads, soil pressure, thermal expansion and contraction caused by thermal stress, vibration loads and seismic misfortunes. To ensure the strength and stiffness of the pipeline, you must set all kinds of support (hanging) aircraft, such as those activities of support, fixation, orientation and other support brackets and springs. Stent set according to pipe diameter, material, pipe wall thickness and loading conditions recognize. Fixation is used to control the pipeline section of thermal elongation, so that even the work of expansion joints; guide bracket to guarantee that tube for axial movement only, to be able to rule out the condensate, steam and also water and gas pipelines should deemed certain degree of slope, usually not small in thousandths. In addition, you can use fitting mold. For gravity flow of underground drains, slope is not less than five thousandths. Water vapor or other gas pipeline set to drain at the lowest point or trap, some of the gas pipeline gives gas-water separator, drain fluid in to be able to prevent the Generation of the water hammer and impede gas flow. Water or other liquid with the exhaust pipe at very high point of installation, remove accumulated in pipes of atmosphere or other gases to prevent air resistance caused by abnormal operation.
Channels, such as not free to stretch, it can have an enormous additional stress. Therefore, large temperature changes the particular pipeline and the call to have the freedom to shift the temperature pipeline, need set the expansion joint, so that compensation for the pipeline expansion get rid of additional stress. For steam pipes, heat pipes, cold pipes as well as anti-burning, freezing pipes required, need incorporated with this outside in the pipe insulation materials, which prevent the pipe internal heat (cold) the volume of loss or freeze. For some high freezing point of liquid pipelines, to be able to prevent the solidification of liquid is just too viscous or customize the transportation, but also for heating and insulation. Commonly used insulation materials are cement perlite, glass wool, rock wool and diatomaceous earth such as mesothelioma.
In order in order to soil erosion, underground metal pipe surface to be coated anti-rust paint or tar, asphalt because anti-corrosion coating, or impregnated asphalt coated glass fabric and flax. Buried in corrosive soils of low resistance with regard to set in the pipeline cathodic protection devices to prevent corrosion. Ground steel pipe to prevent corrosion, the surface coating over that may rust.
Various channels in order to cleaned before use, some of the pipeline should be regularly cleaned internal. Better still ppr pipe fitting. In an effort to facilitate cleaning, the pipe set a filter or air wash clean leak. In the long distance transportation of oil and gas pipelines, to pay off the pipe with cleaning device on a regular basis within the accumulation of dirt, this set dedicated to cleaning devices to mail and receive gadgets. When the pipeline more categories, for you to facilitate the operation and maintenance within the pipe surface, getting rid of of the paint coating to look after identification. For example, the steam pipe with a red, light blue and so on compressed air sewerlines. To ensure the safe operation of pipeline accidents and incidents in impartial manner to stop the expansion, except in the pipe measurement and control instrumentation and valves installed, the pipeline has also taken some important special security measures, with regard to example gas pipelines and long-distance transportation of oil and gas pressure relief valve installed pipeline accident or emergency restrict valve. Them when of catastrophic accidents can automatically stop the delivery on time in order to lessen disaster losses.
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