Polyurethane insulating steel pipe is usually connected by welding,which requires strictly on seam treatment and welding process.
1.The quality of pipeline incision shall comply with the following provisions:
(1) The surface of the incision should be smooth,crack-free,heavy-skinned,without burr,shrinkage,slag,oxide,iron chips,etc.
(2) The inclination deviation of the incision end should not be larger than 1% of the outside diameter of the tube and should not exceed 3 mm.
(3) If pipe end processing is required,groove processing shall be carried out in accordance with the welding plan.
2.Pipeline components shall be selected according to the quantity,specifications and materials specified in the single-line drawing,and the system number of the pipes shall be indicated according to the single-line drawing and the sequence number of the components shall be indicated according to the prefabrication sequence.
Polyurethane insulation pipes
3.When prefabricating pipelines, the selection of free and closed sections should be reasonable.The closed sections need to be processed according to the measured size on site.After prefabrication,the internal cleanliness should be checked,the pipe orifices closed and stacked reasonably in sequence..
4.The butt weld position of polyurethane insulating steel pipes shall comply with the following requirements:
(1) The position of the pipeline should not be less than 100 mm from the bending point of the elbow.
(2) The distance between the two butt welds of the pipes should no more than 5 mm.
(3) The butt weld of the support and hanger shall not overlap with the pipe,and the distance between the weld and the edge of the support and hanger shall not be less than 50 mm.
(4) The pipe interface should avoid the opening position of drainage water,drainage and instrument tube,and should not be less than 50 mm from the edge of the opening.
5.All material,processing dimension and accuracy of pipeline support should be strictly made in accordance with the relevant drawings.The working face of sliding support should be smooth and flexible,without jamming.
Haihao Group manufacture seamless steel pipes,welded steel pipes(ERW,SSAW,LSAW pipes),butt weld pipe fittings,forged pipe fittings and forged flanges according to different standards such as ANSI/ASME,API,ASTM,BS,DIN,EN,JIS,GOST,MSS,etc.If you want to know more about our piping products,please email us:sales@haihaogroup.com
