Spiral welded pipe specifications and storage methods
The spiral welded pipe is a spiral seam welded steel pipe which is made of steel coiled coil as raw material, which is often heated and extruded, and welded by automatic double wire double-sided submerged arc welding process. The device is formed by winding a low carbon carbon structural steel or a low alloy structural steel strip into a tube blank at a certain angle of a helix (called a forming angle), and then welding the tube seam, which can be used with a narrow belt. Steel produces large diameter steel pipes. Spiral welded pipe is mainly used for oil and natural gas transmission pipelines, and its specifications are expressed by outer diameter * wall thickness. Spiral welded pipes are single-sided welded and double-sided welded. The welded pipe shall ensure that the hydraulic test and the tensile strength and cold bending performance of the weld are in compliance with the regulations.
First, the production equipment and specifications of spiral welded pipe
Main unit: BYAND-2000 pipe-making unit manufactured by WILSON BYAND Company of the United Kingdom. The unit is divided into sections and has a total weight of about 130 tons. It can be divided into four main parts for single transportation, which is suitable for laying equipment on site. On-site production, on-site supply of steel pipes. The overall performance parameters of the unit are as follows:
The steel pipe has a minimum size of Φ400×5.0mm and a maximum of Φ3048×25.4mm.
Pipe length is generally 6 ~ 30m, up to 80m
Raw material plate width is minimum 700mm, maximum 2000mm
Steel coil weight up to 40 tons
Material grade up to API 5L×65
Internal and external timely butt welding machine LINCOLN DC-1500
Main drive final drive DAVID BROWN RADICON
Ion-type cutting machine LINCOLN PRO-CUT 125
Hydraulic system VICKERS, DENISON
Electronic control system SIEMENS, ABB
Second, the daily storage method of spiral welded pipe:
The outer diameter of the pipe whose pipe is a spiral welded pipe is indicated by the letter D, and then the outer diameter and the wall thickness are added, for example, a seamless steel pipe having an outer diameter of 105, the wall thickness is 6 mm, represented by D107*5, and the plastic pipe is also It is expressed by the outer diameter, such as De63. Others such as reinforced concrete pipe, cast iron pipe, galvanized pipe, etc. are represented by DN. Generally, the nominal diameter is used in the design drawings. The nominal diameter is artificially delineated for design, manufacture and maintenance. A scale, also known as the diameter, is the specification name of the pipe (or pipe fitting).
There should be a certain channel between the åž› and åž› of the spiral welded pipe. The width of the inspection channel is generally about 0.5m. The width of the access channel depends on the material size and the transportation machinery, generally 1.5 to 2m.
The stacking height of the spiral steel pipe is not more than 1.2m for manual work, 1.5m for mechanical operation, and 2.5m for the width of the concrete.
If the spiral steel pipe is piled up in the open air, it is necessary to prevent wooden mats or stones under the spiral steel pipe, and the kneading surface should be slightly inclined to facilitate drainage, and pay attention to whether the steel pipe is placed straight and prevent the steel pipe from being bent and deformed.
The strength of the spiral welded pipe is generally higher than that of the straight welded pipe. It is possible to produce a welded pipe with a large diameter by using a narrow blank, and it is also possible to produce a welded pipe having a different pipe diameter with a blank of the same width. However, compared with the straight pipe of the same length, the weld length is increased by 40 to 100%, and the production speed is low. After cutting into a single steel pipe, the first three steel pipes of each batch shall be subjected to strict first inspection system to check the mechanical properties, chemical composition, fusion condition, surface quality of the steel pipe and maintenance through non-destructive testing to ensure the pipe-making process is qualified. In order to formally put into production. The spiral welded pipe has a simple production process, high production efficiency, low cost and rapid development.
The height of the bottom of the spiral welded pipe is according to the detailed situation. If the warehouse is the concrete floor of the Rising Sun, the height of the pad is 0.1m; if it is mud, it must be 0.2 to 0.5m high. If stored in the open air, the height of the concrete floor should be about 0.3 to 0.5 m, and the height of the silt floor should be 0.5 to 0.7 m.
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