Stainless steel pipe welded construction program papers

Stainless steel pipe welded construction program papers

 

1.1 Scope of  Stainless steel pipe piping applications have a very wide range, such as running water, hot water, drinking water, heating and industrial pipe systems. The use of covers hospitals, hotels, military, schools, television, commercial buildings, residential buildings, large office buildings and other systems.

 

1.2 prepared in accordance with the standards and specifications

 

1.3.1 Building Water and Heating Engineering Construction Quality Acceptance GB50242-20021.3.2 thin-walled  Stainless steel pipe pipe (GB/T1922.8-2003) 1.3.3 Field Device industrial pipe welding engineering construction and acceptance of norms GB50236-982 construction ready 2.1 technology ready to 2.1.1 started, the construction must be carefully reviewed the drawings, preparation of construction programs, and the team to conduct a comprehensive technical tests to ensure that the quality of the installation.

 

2.1.2 plumbers must undergo technical training after passing the examination, obtain the appropriate licenses for employment, before induction operation. 2.1.3 of  Stainless steel pipe, argon arc welding work must be certified pre-service professional training should be carried out.

 

2.2 The materials to prepare  Stainless steel pipe pipes and fittings must meet the design requirements, and inspection reports, and production certification. Does not match the requirements of the material determined not to use.

 

2.3 of major equipment (1) TIG welding machine. ② Pipeline cutter. ③ argon gas cylinders. (4) Argon table. ⑤ sets of silk machine.

 

2.4 Construction work conditions of civil-wall masonry and stucco finished indoor toilets can have a water supply pipe installation conditions.

 

2.5 prepare

 

2.5.1 The technical director (foreman) and one preparation of budgets and final accounts, the construction program, equipment, materials planning. Grasp the work of the construction progress, quality inspection, production safety, and final acceptance.

 

2.5.2 Construction monitor a division of labor on-site workers and to assist in the technology responsible for (foreman) to do a good job of construction progress, quality inspection, safety in production, completion and acceptance of work. 2

 

4 .5.3 plumber is responsible for cutting the pipe, under the materials and material installation. 2.5.4 argon arc welding workers 2.5.5 quality and safety of members of a grasp quality inspection, and the entire construction site, equipment, materials, personnel supervision and inspection of safe and accident-free.

 

2.6 Construction deployment of  Stainless steel pipe pipe of the project to connect the welding engineering the total project amount of 90 so should pay attention to the welder process arrangements to ensure the welding quality improve work efficiency with the following professionals: plumber familiar with the construction drawings, operating machinery can cut pipe accurate grasp of the sizes of materials, understand the quality requirements and specifications of the pipeline construction process; welders, professional training, familiar with the automatic welding machine performance, operating essentials, familiar with the chemical composition of ordinary welding consumables, commonly used in current regulation. 3 construction process 3.1 process: Installation Preparation → prefabrication → dry → riser pipe installation installation → branch pipe installation → pipeline pressure test → pipeline flushing → pipe insulation 3.2 operating points:

 

3.2.1  Stainless steel pipe pipe welding: the 3.2.1.1 welding cutting and beveling should adopt mechanical methods can be applied to the plasma arc, oxyacetylene flame and thermal processing methods, the thermal processing method for processing groove, must be removed groove surface of the oxide scale, slag, and affect the quality of the joint surface of the surface layer, and the the rugged Department should be polished smooth. 3.2.1.2 welding group before the groove should be within the outer surface of not less than 10 mm within the scope of clean oil, paint, dirt, rust, burrs, and galvanized layer, cut may not have cracks, mezzanine and other defects .

 

3.2.1.3 pipe or tube butt weld group, the inner wall of their flat, the inner wall of the wrong side of the amount of not more than 10 of the wall thickness, and should not be greater than 2mm. 3.2.1.4  Stainless steel pipe weldment groove on both sides of each 100mm range, measures should be taken to prevent contamination of the surface of weldment weld spatter before welding.

 

 

3.2.1.5 welding rod, flux should be required prior to use for drying, and should be used as to keep dry. The surface oil, corrosion and other wire should be removed before use. 3.2.1.6 welding rod, welding wire selection, in accordance with the base metal chemical composition, mechanical properties, crack resistance of welded joints before welding, preheating and post weld heat treatment, conditions of use and construction conditions, and other factors to determine. 3.2.1.7 is strictly prohibited outside of the groove surface of the base metal arc and test current, and should prevent the parent material of the arc abrasions.

 

 

3.2.1.8 The thin-walled  Stainless steel pipe tube cut pipe special pipe cutting machines, materials, ensure that the port quality meets the standards required by the automatic welding. Usually thin-walled  Stainless steel pipe pipe must be within 0.5mm of their counterparts in the gap. 3.2.1.9 thickness of 3mm  Stainless steel pipe tube in order to ensure penetration, their counterparts in the gap slightly larger, should be appropriate filler wire, the wire diameter of 1mm. 3.2.1.10 In order to ensure internal quality welds inside of the pipe filled with argon protection. 3.2.1.11 welding finished weld should be the instinct to wash passivated weld obtained with the base metal has a similar luster, at the same time, produce passive film, so that the welds have antioxidant capacity. 3.2.2 wire of  Stainless steel pipe pipe connected: 3.2.2.1 cut: use a handsaw, high-speed grinding wheel, cut or cut to 1/3 of steel thin-walled at first pipe cutting, tube sawing using a handsaw. Not time to cut off the pipe with a pipe cutter. 3.2.2.2 Processing thread: threading machine, lathe or manual tube hinge sheet processing pipe-threading, thread length is the length of the international regulations. 3.2.2.3 deburring: with special tools to remove burrs and finishing port of the pipe end. 3.2.2.4 Connection: connection method is identical with ordinary water pipe.

 

 

3.2.3  Stainless steel pipe pipe installation: 3.2.3.1, riser installation method to check the suspension wire, the first stent pipeline, the level of dry pipe installed to control the well at both ends of the standard of points. 3.2.3.2, the floor height ≤ 5 m riser bracket on each installation, the installation height is 1.8 m.

 

 

3.2.3.3, the bracket should be installed in the correct position, and firmly embedded. Bracket processing of non-oxygen cutting welding, cutting machine, punch a hole using the drill. Stents need to play the prominent part of the angle elevation angle, polished, smooth burr should be close contact with the pipe. 3.2.3.4 pipe horizontal mounting of the support hanger spacing should not exceed the provisions of the following table: maximum spacing of supports and hangers engineering diameter (mm) 15 20 25 32 40 50 70 80 100 125 150 200 250 300 insulating pipe 2 2.5 2.5 2.5 3 3 4 4 4.5 6 7 7 8 8.5 bracket the maximum distance (m) non-insulation 2.5 3 3.5 4 3.5 5 6 6 6.5 78 9.5 11 12 3.2.3.5 water supply riser from the wall distance: DN ∠ 30mm, the pipe skin away from the wall 2035mm; 32-≤ DN ≤ 50mm pipe skin away from the wall 3050mm; 75 ≤ DN ≤ 100mm pipeline skin away from the wall 50mm. 3.2.3.6 The water supply main pipe should be 3 ‰ slope aspect discharge direction. 3.2.4 The pipeline pressure test: water supply pipeline to do a single hydrostatic test. Pipeline system after you install the integrated hydrostatic test. Put a net air hydrostatic test pressure after filled with water, domestic water supply system is pressurized to 0.9MPa pressure to stop, inspect, such as the interface and valves are free from leakage, continuous 10min observation of the pressure drop is not 0.02MPa, and then fell to 0.6Mpa should be no seepage does not leak. 3.2.5 flushing the pipeline: the pipeline pressure test is completed you can do the washing and disinfection, tap water rinse application for, and should ensure that there is sufficient flow. Pipeline flushing and disinfection of the outflow of water quality should be clear and free of impurities, and to meet the health standards.

 

 

Construction drawings

 

4 4.1 The master project quality requirements: 4.1.1 weld requirements: to achieve the national standard GB50236-984.1.2 welding consumables requirements: All welding materials must have a factory certificate, prohibited the use of nonconforming product. 4.1.3 The surface depression shall not be greater than the side should 0.1δ4.1.4 bite of ≤ 0.05δ and ≤ 0.05mm undercut total length of no more than 10 weld perimeter. I high ≤ 10.10b, up to 3mm. 4.1.5 To ensure that the closing arc welding at the quality, after the extinction is still necessary to carry out continuous aspiration to protect the aspiration time of 57 seconds. 4.2 General items: 4.2.1 thread processing precision  Stainless steel pipe pipe shall comply with the provisions of international pipe thread, the thread clean neat 2-3 buckle broken wire or missing wire is securely connected to pipe thread roots exposed threads. 4.2.2,  Stainless steel pipe tubes, welded steel pipe flange connections respond to access parallel closely perpendicular to the pipe centerline. The screw exposed nut length, and not more than half of the diameter of the screw, the nut on the same side, the liner material to meet the design requirements and construction specification. 4.2.3 water supply pipe installed to allow deviation as follows: installation of water supply pipe to allow deviation 1mm level per m pipe vertical and horizontal direction bending pipe,  Stainless steel pipe tube ≯ 25mm total length of 25m or more per meter 3mm riser verticality pipe,  Stainless steel pipe tube of 5 m above ≯ 8mm pipe segments in the same plane and into a row of valves welded pipe,  Stainless steel pipe tube 3mm away from the

 

 

5 product protection to the water project construction is completed, you should inform the subsequent types of work construction workers to avoid the impact the water supply pipe in the construction process, to avoid pipe breakage or tilt.

 

 

Quality problems should be noted that strictly control the water supply riser vertical 6.1. 6.2 strict control of the branch pipe slope, to prohibit the phenomenon of down slope. 6.3  Stainless steel pipe pipe welding quality must conform to the norms of the construction site. 6.4 pipe welding or wire connected should clean up the burr of the checkpoints to prevent clogging the pipes.

 

 

Quality Records 7.1 pipe installation weld inspection record 7.2 pipe installation quality inspection of the batch record 7.3 pipeline hydrostatic test records 7.4 pipe rinse, disinfection test records

 

 

Security measures 8.1.1 building a safety assurance system, clear safety officer job, responsibilities, rights. 8.1.2 The erection of safe and reliable scaffolding. 8.1.3 pipelayers must be taken so as not to bruise the pipe or harm to others. 8.1.4 The operating personnel must wear helmets. 8.1.5 pipeline welding to prevent fires, portable fire extinguishers should be placed in the welding site. 8.1.6 The use of abrasive cutter to pay attention to safety, to prevent personal injury.

 

8.2 environmental protection measures 8.2.1 measures need to cut to cut the tube should be closed to do the dust, arson measures.