High Frequency Welded Pipe Product Manuals

I. Product Introduction
High-frequency welded steel pipe product standard name for the “low-pressure fluid transportation with welded steel pipe”, widely used in the transportation of water, gas, fire, air, oil and heating steam and other low-pressure fluid transportation, as well as agriculture to greenhouses, furniture, scaffolding and other mechanical structural purposes of the welded steel pipe. Steel pipe according to the wall thickness is divided into ordinary steel pipe and thickened steel camp. 4 points - 12 inch high-frequency welded pipe through the production grid control, inspection and testing, are up to the national standard, straight seam welded pipe in the welding and outer diameter, oval degree, the quality of the pipe end of the length of the fixed length, the quality of the surface, the wall thickness tolerance, packaging quality and so on, according to the national GB / T3091, GB/T700, GB/T13798, SY/T5768 and the internal control standards. Enterprise internal control standards, strictly formulated and implemented.
Specification:DN15-300MM round pipe
Usage: Used for water, gas, air, oil, steam and other low-pressure fluid transportation and mechanical structures and so on.
Company:Foshan Sanshui Zhenhong Steel Products Co.

Second

the implementation of standards
China National Standard GB/T3091-2015 Low Pressure Fluid Conveyance Welded Steel Pipe with Zinc Dip
Third, series products

V. Connection methods
(一) Welding connection.
Directly welded pipe with electric welding, simple and convenient, strong operation, suitable for shorter connection distance

(二) flange type connection: simple and convenient, easy to replace, must be in accordance with the design requirements and engineering requirements of the pressure selection flange.
① flange connection bolt diameter, length should meet the requirements of the specification, flange fastening good bolt exposed wire buckle should generally be 2-3 buckles, should not be greater than 1/2 of the outer diameter of the bolt.
②) flange connection liner should be 3mm thickness of rubber gasket, heat, steam, domestic water pipeline should be 3mm thickness of asbestos gasket, gasket should be concentric with the pipe wall, shall not be deviated.

(三) Turning wire connection
① car silk, to ensure that the thread length, tooth shape, tooth high parameters are in line with the relevant standards of technology requirements.
② steel pipe car wire connection, should be connected to the outer wire buckle or pipe fittings within the wire buckle filled with adaptable filler material, play a sealing and maintenance of the mouth with, at the same time, easy to dismantle for maintenance. Filler wrapped, hand screw 2-3 buckles screw mosquito is appropriate, and then pipe pliers will pipe fittings screwed 3-4 buckles, and then the remaining 2-3 buckles, the remaining portion of the external threads should be anticorrosive treatment.

（四) Trench connection.
This connection is easy to operate, should be in line with CECS151:2003 China Engineering Construction Standardization Standard (Trench Connection Piping Engineering Technical Specification")
See the following chart (Table 2)

Table 2.
Minimum wall thickness and groove dimensions for steel pipes
Unit:(mm)

Note: The nominal pressure PN of the steel pipe in the table is not less than 2.5pa.

（六）Transportation and Packaging
(1) Transportation: steel pipe transportation should be careful and light, forbidden to throw, drop, drag and violent impact, to avoid deformation, affecting the use of welded pipe and appearance quality. (2) Packaging: welded pipe packaging, such as sea transport must be oiled to avoid rust due to seawater humidity, has been set wire of welded pipe should be the head of the tube with a good sheath to avoid touching the wire buckle, welded pipe in the packaging must be tightened with packing tape into a hexagonal shape.
③Storage: In the process of storage and storage is strictly prohibited contact with acid, alkaline substances, so as to avoid corrosion of welded pipe, welded pipe can not be directly in contact with the ground in the storage process, to be cushioned with pillows, try not to get wet, to prevent rusting of welded pipe.
（七） Problem solving
In the installation process the best way is to weld the mouth (weld rib) upwards, which can increase the service life of the welded pipe, groove connection should be in strict accordance with the CECS151:2003 standard:: ① The groove can not be welded to the ground when the welded pipe is installed.
(1) the groove can not be welded pipe groove bias; ②) the pipe end to the CECS151:2003 standard.
(ii) The surface from the pipe end to the rough groove section should be flat, without bumps and roll marks; (iii) The pipe must be connected to the groove in the same way as the welded pipe.
(iii) The pipe must be level when grooving; (iv) The axis of the pipe should be in line with the rolling line.
The pipe axis is perpendicular to the front of the grooving machine.
⑤ Pay attention to the depth of grooving.
⑥The welded pipe connected by grooving must meet the national requirements.