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In order to avoid stabbing the sealing ring, use special tools or files to remove the burr completely, and place the sealing rubber ring in a proper position
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③ draw a marking line around the pipe end with a marker to ensure the correct insertion depth of the pipe
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Insert the pipe straight into the extruded pipe fitting, and pay attention not to damage the rubber sealing ring, And confirm the distance between the end of the pipe fitting and the line drawing position, which is 3 mm when the nominal diameter is 10-25 mm; When the nominal diameter is 32-100 mm, it is 5 mm
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The ring groove of the ring pressing (or clamping) tool jaw should be close to the ring convex part with rubber ring in the end of the pipe fitting
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The jaw should be perpendicular to the pipe axis
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After the operation, the groove should bite the pipe fitting until slight vibration occurs
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During the ring pressing connection process, the hexagon gauge should be used to confirm whether the size is correct, The sealing pressure is correct when the hexagon gauge is completely inserted at the sealing pressure
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Other requirements: the thin-walled stainless steel pipe and valve, water meter, water nozzle, etc
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shall be connected by adapter, and it is strictly forbidden to thread on the thin-walled stainless steel pipe
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4
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According to the installation process standard for stainless steel clamp and flange connection of cast iron pipe, the interface section shall be cleaned and flat without flying thorns, the outer surface of the pipe shall be scrubbed and cleaned, the hoop and sealing ring shall be put after the lubricant is applied, and the sealing ring shall be flanged; After inserting another pipe end, the rubber ring is reset; Move the pipe hoop to the rubber place and lock the fastening bolt
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For large diameter pipes with multiple clamps, the bolts should be tightened alternately
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④ (6) and (7) installation of horizontal pipe hanger: at the joint of horizontal pipe joint, elbow, tee, cross and other pipe fittings, one joint must be installed on each side
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The clear distance between hanger and joint should be 500mm, and the distance between two hangers should not be more than 2.0m
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The type of hanger can be determined according to the size of the pipe
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The angle steel hanger with mark ④ and mark ⑥ can be used for the pipe of 100 mm and below
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However, the pipe clamp must be a special anti holding pipe clamp whose strength can bear the weight of the pipe
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The ordinary pipe clamp shall not be used
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The door angle steel hanger with mark ⑦ can be used for the pipe of 200 mm and above
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When the length of horizontal pipe exceeds 12M, a diagonal brace hanger or bracket fixed with pipe clamp must be set every 12m to prevent horizontal displacement
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Fixed anti sway supports and hangers shall be used for pipe turning, branch of tee and cross and over a certain length
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Rubber pipe or rubber pad shall be used for isolation at the contact between cast iron pipe and steel support
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Other requirements: the riser support shall be set at the lower part of the pipe flange to facilitate stress; There should be bottom support at the bottom of riser; If the paint falls off, the pipeline shall be repainted; The slope of drainage pipe should be ensured, and no reverse slope should be formed; Pipeline installation shall be carried out after civil plastering or protective measures shall be taken, and the installation surface shall be clean
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Steel pipe thread connection construction process standard process: pipe breaking – Cleaning – threading – connection – Cleaning – anti-corrosion
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When cutting steel pipe, keep the cutting piece perpendicular to the pipe
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Plastic lined steel pipes and other composite steel pipes can not be cut by grinding wheel cutting machine or threading machine, but by hand saw, electric band saw or special cutting machine provided by the manufacturer, and the cutting fracture surface shall be treated with necessary gluing and anti-corrosion treatment
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A special file is used to remove the burr completely, and a certain slope is formed on the end face of the pipe orifice
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The threading machine for processing pipe thread must be equipped with automatic measuring equipment
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The processing of thread shall be straight, clear, complete and smooth without burr and broken thread
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The total length of missing thread shall not exceed 10% of the thread length
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The processing times ranged from 1 to 4
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Pipe diameter 15 ~ 32mm, set twice; 3 sets of 40 ~ 50mm pipe diameter; 3-4 times for pipe diameter above 70mm; For thread connection, white thick lacquer hemp wire or Teflon raw material belt shall be used as filler, and the needle shall be tightened along the winding direction at one time without back tightening, and 2-3 turns of thread shall be left after tightening; White thick paint is not used for domestic water supply; Liquid raw meal belt is not recommended
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After the pipeline is connected, the packing squeezed to the outside of the thread shall be cleaned
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The packing shall not be squeezed into the pipe cavity to avoid blocking the pipeline
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Meanwhile, the exposed thread shall be treated with anti-corrosion; The anticorrosive paint shall extend to 1cm outside the screw thread to form a neat ring; The surface mounted pipeline should also be painted with the same color as the pipeline
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Hot melt connection (socket) process standard for plastic pipe hot melt connection process flow: pipe breaking – Cleaning – marking – heating – docking or inserting – straightening – cooling pipe breaking: use special cutter to cut the fracture of pipe fittings, and use milling cutter or scraper to remove the internal and external burrs of fracture; Cleaning: wipe the connecting surface of pipe and pipe fittings with a cloth to ensure cleanness and no oil stains; Marking: measure and mark the hot melt depth at the pipe end with ruler and marking pen; Heating: turn on the power and start to work after the work indicator is on; When heating, the pipe end without rotation is led into the heating sleeve of the heating die and inserted to the marked depth
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At the same time, the pipe fitting without rotation is put on the heating head at the other end to reach the specified mark; Connection and butt joint: after reaching the specified hot melting time, take out the pipes and fittings from the heating sleeve and heating head for butt joint at the same time
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Connecting and inserting: insert the pipe to the marked depth in a straight line quickly and evenly without rotation to ensure that the pipe and pipe are coaxial, and the joint forms a uniform flange at the same time
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Effect inspection: during the operation of hot-melt connection, the heating time must be strictly controlled, and there must be no rotation and insertion during the connection
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There is a uniform convex ring inside and outside the pipe, and there is no hot-melt glue clogging phenomenon
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Standard process flow of galvanized steel pipe clamp connection construction technology: pipe breaking – Cleaning – groove pressing – rubber ring releasing – groove installation – pairing – lubricant application – clamp installation – nut tightening
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① the cutting piece of steel pipe shall be vertical to the pipe when cutting
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The compound steel pipe such as plastic lined steel pipe can not be cut by grinding wheel cutting machine, but by hand saw, electric band saw or special cutting machine provided by manufacturer
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② The cut surface should be treated with necessary adhesive plastic repair and anti-corrosion treatment
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Use a special file to remove the burr completely
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③ The ground is flat, and the groove pressing machine is stable and reliable; ④ The steel pipe and the groove pressing machine platform are on the same horizontal plane, and the fixed support tailstock which can adjust the height shall be provided
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⑤ When pressing the groove, the handle of the hand pump shall be pressed down evenly and slowly, and the stroke of each handle shall not exceed 0.2mm
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The steel pipe shall be rotated for one circle until the upper limit nut of the groove pressing machine is in place, and then the machine shall be allowed to rotate for more than two weeks to ensure uniform wall thickness; The pipe shall be kept horizontal and at a 90 degree angle to the baffle of driving wheel of groove pressing machine °， The groove should be pressed continuously and gradually; Check the pressed groove size
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If it doesn’t meet the requirements, fine tune it, press the groove for the second time, and check the groove size again to reach the specified standard size
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Put the rubber ring into the end of the steel pipe, and pay attention not to damage the rubber ring; Align the other steel pipe with the pipe, leave a certain gap between the two steel pipes, move the rubber ring, adjust the position of the rubber ring to make the distance between the rubber ring and the groove of the steel pipes on both sides equal, and apply lubricant on the end of the pipe and the rubber ring; The upper and lower parts of the clamp are tightly fastened on the sealing rubber ring, and the convex edge of the clamp is clamped into the groove; Press the ears of the upper and lower clamps by hand to make the upper and lower clamps close to each other and penetrate the bolts
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The elliptical neck at the root of the bolt enters into the elliptical hole of the clamp
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Use the wrench to rotate evenly and tighten the nuts synchronously to make sure that all the convex edges of the clamp are in the groove
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For clamp type connection, hangers shall be set symmetrically and evenly within 300 mm at both ends of the clamp
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Angle steel or channel steel gate type fixed hanger shall be set for pipe turning, branch and over 20m length
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Standard process flow of copper pipe welding connection: straightening – pipe breaking – Cleaning – preheating – Welding – cooling – removing oxide layer – anti-corrosion
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Special copper pipe cutter is used for copper pipe cutting, and the incision is neat
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Oxygen acetylene cutting is not allowed
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The two sides of the vice jaw for clamping copper pipe should be padded with wood pads to prevent the pipe from being pinched
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Remove the burr inside the copper tube with a file
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Before welding, the grease, oxide, dirt and dust on the surface of the copper tube inserted into the joint shall be removed with sandpaper
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Insert the copper pipe into the copper fittings, and the insertion depth is in place.
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