Specific standards are:
Compressed air piping installation standards and pneumatic equipment engineering installation acceptance standards
Refer to GB5038-2006 general provisions
Pipe to pipe, pipe to equipment connection shall not be strong counterparts.
Compressed air carbon steel pipe paint should be removed before the surface of the rust, weld slag, burrs, oil and water and other contaminants, test pressure before the weld shall not be painted Pipeline Welding Carbon steel pipe compressed air butt joints should be used argon arc welding or argon arc welding base, arc filling.
Compressed air carbon steel pipe butt weld appearance quality does not allow cracks, pores, slag, soluble spatter and not welded through: biting depth of less than 0.5mm,
and the total length of both sides of the weld is less than 10% of the total length of the weld, weld and the height is less than or equal to 1 + 0.1b (b is the width of the weld), and not more than 3mm. Pipeline production Pipe cut off, tube Pipe cutting, pipe beveling should be mechanically processed. Cutting end
should be flat, the end should be perpendicular to the axis of the pipe, the allowable deviation of 1% of the diameter of the pipe and should not be greater than
2.0mm. Pipe welding bevel form, size should be in accordance with the provisions of the welding instructions, bevel processing should be completed to remove iron filings, burrs, etc. clean. Pipe bending should be in accordance with the following provisions: 1, bending should be used cold bending, bending the minimum bending radius should not be less than
The outer diameter of the pipe
3 times; the use of punched elbow, the bending radius should not be less than 1 times the outer diameter of the pipe.
2, pipe bending the maximum outside diameter and the minimum difference between the outside diameter should not exceed 8% of the diameter of the pipe. 3, the pipe bending parts should not have wrinkles, skinning and other defects. 4, pipe threading should be consistent with the provisions of the design and technical documents. Thread
Processing is completed, the surface should be free of cracks, depressions, burrs and other defects. There is a slight mechanical damage or incomplete section of the thread, the total length should not be greater than 1/3 turn, thread height should not be reduced more than 1/5 of its height. Pipe installation Carbon steel compressed air pipeline laying should be in line with the following provisions: 1, pipe direction should be in line with the requirements of the design and technical documents, horizontal pipeline level
Straightness allowable deviation of 2/1000, and no more than 30mm; vertical riser pipe allowable deviation of 3/1000, and no more than 30mm. Allowable deviation is 3/1000, and not more than 20mm; according to the design of technical documents specified in the coordinate position and elevation of the size of the installation pipeline, coordinate position
allowable deviation of 15mm, elevation allowable deviation of ± 15mm. 2, the distance between the pipe outer wall and the edge of the neighboring pipe, pipe fittings should not be less than 10mm, with the same row of pipeline flanges or live fittings should be staggered each other less than 100mm: through the wall pipeline should be added with a wall, the pipe should be staggered. 100mm: the pipe through the wall should be added casing, the distance between the joint position and the wall should be more than 800mm. 3, compressed air carbon steel pipeline slope should be in accordance with the provisions of the technical documents, there is no provision, the inclined slope is
12.5/1000~25/1000,
4, flange connection should be concentric with the pipeline, the connecting bolts should be free to wear,
The two flange butt surface should be
The two flange butt surface should be
The two flange butt surface should be
The two flanges should be parallel to the butt surface, parallelism tolerance should not be greater than 1.5/1000 of the flange diameter.5, the pipe bracket and pipe clamp installation should comply with the following provisions: ① bracket installation in the correct position, firmly fixed, the pipe and the pipe contact with the pipe clamp is tight, the pipe bracket and the pipe clamp should not be welded at the pipe. ② pipe bracket spacing straight part of the pipe should be in line with the provisions of the curved part should be
bending point near the additional bracket. ③ pipe bracket should not be in direct contact with each other. 6, the hose should be installed in accordance with the following provisions: ① outside diameter greater than 30mm of the hose, the minimum bending radius is not less than 7 times the outer diameter of the tube. ② hose shall not have twisted deformation.
3 between the hose and the hose, hose and other objects shall not be friction. Hose from the heat source near, there must be thermal insulation measures. 7, pipe coating thickness, the number of times should be consistent with the design requirements. Coating
should be uniform, consistent coloring, no leakage, flow, bubbles and other defects. Pipe blowing compressed air carbon steel pipe must be knocked, blowing according to the process. After blowing the pipe wall should be in line with the design and technical documents, not specified should be free of rust, iron oxide and other foreign matter.
Pneumatic piping system pressure test
Pneumatic piping system pressure test should be in line with the design of technical documents,
The test pressure should be 1.5 times the working pressure: under the test pressure, stabilize the pressure for 10 minutes, reduce the test pressure to the working pressure for system checking, pipeline weld seams and connections should be free of leakage, pipeline without permanent deformation. Compressed air piping installation procedures Material purchase - material inspection - bracket production - bracket installation -
Compressed air piping installation requirements compressed air piping can be welded steel pipe or seamless steel pipe pipe elbow should be used as much as possible simmering elbow, the bending radius should not be less than the nominal diameter of 3 times the ellipticity should not be greater than 8%. After cutting, drilling and welding of the pipe, the pipe should be cleaned up, do not allow metal slag, residues and other dirt. Piping system, all support, hanger installation should be firm, correct position, no
Distorted, loose phenomenon. Vertical installation of the pipeline should be vertical, the length of more than 4m allow deviation
12mm, within 4m allow deviation of 4mm Horizontal installation of the pipeline should have a certain slope, the slope deviation shall not exceed
over ± 0.0005.
Pipeline installation should be completed by compressed air blowing, remove the pipe dirt. The outer surface of the pipeline is generally first painted 1-2 anti-corrosion paint, and then painted once light
Lan color-toned paint, buried pipelines should be brushed with asphalt paint. Material, according to the size of the drawings to determine the actual installation of the length of the pipe section, and in the material according to the length of the installation of the pipe section intercepted, called material. Drawings are generally not labeled installation length, but only given parts, turn
points, bracket positioning with the relative size, so can only be calculated according to the dimensions of the drawings of the length of the material. Threaded pipe section length, drawing dimensions minus the length of the fittings must be part of the pipe, but also according to the pipe in the two fittings between the edge of the
length plus the length of the threaded working length to calculate. For welded pipe sections, the cutoff length, drawing dimensions minus the length of the fitting and the weld gap, plus weld take-up if necessary. The length of pipe section for flange connection, the drawing size minus the flange thickness, such as one end of the flange, it should be minus 1/2 of the flange thickness. In order to obtain the installation of the pipe section, the saw, oxygen - acetylene flame cutting, mechanical cutting and other methods, intercepted on the pipe, the installation of the section of the pipe must be flat, no
burr and other defects, such as defects, should be filed, orifice scraper and abrasive tools such as tools to trim. Thread processing, threaded connection of the pipe section thread processing can be used manually and mechanically processed in two ways.
Manual threading is to use the pipe reamer to process the threads on the pipe, mechanical
Mechanical processing is usually carried out with a lasso machine, when the pipe diameter is larger or longer threads, can be processed with a lathe. The processed threads should have the necessary working length and thread tail length of 1-2
button threads. Pipe threads must be complete, smooth, no burrs and messy threads, the total length of broken and missing threads shall not exceed 10% of the total length of the threads, and in the longitudinal direction
there shall be no breakage of the defects against each other. Bevel processing, welding pipe in the installation of the pipe section, should be based on the thickness of the pipe wall, pipe diameter size, decide whether to open the bevel or bevel size, wall thickness greater than 3mm, should open the bevel, when the pipe needs to be welded on both sides, should be opened on both sides of the bevel, when the quality of the weld is required to be high, the bevel should be mechanically processed, there are no special requirements, can be used to cut the bevel of the oxygen - acetylene flame. Threaded connection, threaded connection, between the threads should be added to the appropriate sealing filler, such as PTFE - vinyl sealing tape and other materials, PTFE - vinyl sealing in the past commonly used hemp wire, lead oil sealing has been gradually replaced by PTFE - vinyl sealing, PTFE sealing tape can resist corrosion of a variety of media, withstand the
up to 70MPa pressure, operating temperature in - 180 ~ 260 ℃, screwing the sealing tape can resist the corrosion of various media, withstand the pressure, working temperature in the - 180 ~ 260 ℃, the working temperature in the - 180 ~ 260 ℃. 180 ~ 260 ℃, tightening pipe threads to use the appropriate pipe pliers, pipe threads tightened, the threads should be exposed 1-2 button threads, if the exposed threads are too few, or to the end of the sense is not tight, should be reworked pipe threads.