Location:HOME > NEWS > The pipe should be connected by threaded flange or welding

The pipe should be connected by threaded flange or welding

2022-03-18 08:45:47   COMMENT:0 HITS:
When the threaded flange adopts threaded connection, the fittings of hot-dip galvanized steel pipe should adopt forged cast iron threaded fittings gb3287 ~ 3289, and the fittings of hot-dip galvanized seamless steel pipe should adopt forged steel threaded fittings GB / t14626.
During thread connection, the thread shall comply with the relevant provisions of the current national standard 55o tapered pipe thread gb7306. Sealing tape should be used as the sealing of thread interface, and the sealing tape should be applied on the male thread.
During flange connection, the sealing surface form and pressure grade of the flange shall comply with the technical requirements of the fire water supply system.
The type of flange should be flat welding flange, butt welding flange and threaded flange according to the connection form. The selection of flange must comply with the standards of steel pipe flange gb9112 ~ 9131, steel butt welding seamless pipe fittings GB / t12459 and PTFE coated gasket for pipe flange GB / t13404;
When flange connection is adopted for hot-dip galvanized steel pipe, threaded flange shall be selected. When the system pipeline adopts the pipeline with non anti-corrosion inner wall, it can be welded.
Pipeline welding shall comply with code for construction and acceptance of field equipment and industrial pipeline welding engineering (gb5036).
When the pipeline is welded, it shall comply with the relevant provisions of the current national standards code for construction and acceptance of field equipment industrial pipeline welding engineering and code for construction and acceptance of industrial metal pipeline engineering gb50253; Threaded union joints shall not be used for pipes with pipe diameter greater than DN50, and single reducing joints shall be used at pipe diameter change.

previous_pagefirst_page
next_pageA flange is defined as a plate type device

<ALL>