Welcome To The Official Website Of Kaifeng Kaixing Air Separation Equipment Co., Ltd!

National hotline

18537395007

开封氧压机

News classification

Contact us

Kaifeng Kaixing Air Separation Equipment Co., Ltd.

Contact:Manager  Ma

Tel:18537395007

Phone:0371-23810666

Email: 15010595007@163.com

Website:en.kfkxkf.cn

Address: West of Qianhe Village, Gulou District, Kaifeng City

Analysis on the cause of pipeline leakage in the cold box of air separation equipment

Your current location: Home page >> News >> Industry trends

Analysis o...

Release date:2020-03-11 Author: Clicks:

1. Installation quality is not up to standard


Most of the pipelines in the cold box leak when the installation of the quality department through the installation process is caused by lax control. The leakage of the container is mainly reflected in the following five aspects:


The piping in the cold box was not constructed in accordance with the specifications, and the construction in the tower was haphazard and not constructed according to the requirements of the drawings. Nine old factory 1 # steel oxygen plant air separation equipment, liquid nitrogen before the tower regulator V3 bracket mounting optional sex is very big, the level of the pipe bracket is installed in the middle of the horizontal section, and with the horizontal line between the reserved position is too small, although the end of the pipe weld is not cracking, but the horizontal deformation is bigger, affect the amount of liquid nitrogen into the tower.


The welding quality of the pipe rack and valve rack in the cold box is not up to standard, and the material quality and quantity of the pipe rack and valve rack do not meet the requirements. The quality of pipeline welding seam in the cold box can be monitored by a series of means such as film taking, pressure test and leak detection, naked cold leak detection, etc., but the welding quality of pipeline pipe rack and valve rack in the cold box is completely guaranteed by on-site personnel inspection. If the inspector's skill level is not enough or the inspection is not in place, the consequences will be very serious. For example, the 10000m3 / h air separation equipment of an oxygen plant in south China was stopped for maintenance after 3 days of operation, mainly because most of the pipe racks in the tower fell off. Pipe rack, valve rack materials are almost all used DN40mm stainless steel pipe, and DN40mm more than the use of non-repair steel pipe is rarely; Installation quality problems, all the pipe, valve rack, rarely full welding, most of the spot welding.


Pipes should not be aligned mechanically or manually before welding, which requires special attention when installing pipes in cold boxes. Should make the pipeline natural docking as far as possible, to prevent the generation of the stress of the pipeline itself. If the pipe is mechanically and manually aligned before welding, the weld is likely to crack in the cold state, resulting in leakage.


When welding the pipe in the cold box, the welding ground line is attached to the equipment at will, and the welding gun fires the arc on the pipe. For example, the leakage point on the pipeline in front of valve V757 of no.2 air separation equipment in jiugang oxygen plant is caused by the construction unit arcing the aluminum tube in the cold box at will.


After the completion of the construction, all the scaffolding in the cold box shall be removed to avoid touching the pipes and containers in the tower. AnYuan iron and steel co., LTD., oxygen plant 1 # air separation equipment argon tower near the cold box II instrument tube rupture, is due to the construction units did not clean up all the scaffolding inside cold box, and instrument piping from crude argon tower II led to the cold box wall, just is blocked by a scaffold, crude argon tower II under the cold shrink down, also with the decrease of the instrument piping position and is blocked by scaffolding after JiGen pulled apart or cause drag mark.


Site address:http://en.kfkxkf.cn/news/428.html

Key word:

Recently browses:

开兴空分

Scan, focus on us

1.png Tel.: 18537395007

2.pngQQ: 54270032

3.png Email: 15010595007@163.com

4.png  Address: West of Qianhe Village, Gulou District, Kaifeng City


  • QQ
  • Tel
    18537395007
  • Message
  • Website
  • Online consultation
    Welcome to leave us a message
    Please enter the message here, we will contact you as soon as possible。
    Name
    contacts
    Tele
    Landline / mobile number
    Mailbox
    mailbox
    Address
    address