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Pre-welding pretreatment process for pipeline and pipe fitting

A technology of pretreatment and pipe fittings, applied in the direction of manufacturing tools, welding equipment, tubular objects, etc., can solve the problems that the quality of pipe or pipe fittings affects the quality of the project, and the processing speed has a great impact, so as to shorten the pretreatment time, speed up the efficiency or Speed, beneficial effect on oxidation protection

Inactive Publication Date: 2017-03-08
黄鸣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For pipeline laying occasions with a large number of pipes and pipe fittings, many specifications, and large pipe diameters, the construction progress of pipe installation is greatly affected by the processing speed of pipes and pipe fittings, and the processing quality of pipes or pipe fittings also directly affects the quality of the project. , the invention provides a pre-welding pretreatment process for pipes and pipe fittings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The pre-welding pretreatment process of pipes and fittings is used for pre-welding pretreatment of metal pipes or fittings during pipeline laying. The treatment process includes degreasing, pickling and passivation treatment processes. Treatment and passivation treatment are carried out in sequence, and a washing process is also included between any two processes.

[0017] Specifically, in this treatment process, the pickling process is set before the degreasing process. When some pipes or pipe fittings have serious rust before entering the site or before pretreatment, pickling and derusting first can clean the pipe more thoroughly. Or the rust and dirt on the surface of the pipe fittings. In this way, setting the degreasing process after pickling is beneficial to speed up the efficiency or speed of degreasing. In this way, the pretreatment time of the entire pipe or pipe fittings can be significantly shortened.

[0018] In order to ensure that the treated pipes or pipe...

Embodiment 2

[0020] This embodiment is further limited on the basis of Embodiment 1. Further, in the sealing process, the inside of the pipe or fitting is protected with inert gas.

[0021] Further, the inert gas protection is to protect the inside of the pipe or fitting with nitrogen.

[0022] In order to protect the passivation film obtained in the passivation process, an alkaline water washing process is also included between the passivation treatment process and the sealing and sealing process.

[0023] As an easy-to-implement sealing method, the fixed sealing diaphragm uses a sealing tape or a pipe cap to seal the open end of the pipe fitting and the pipe.

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PUM

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Abstract

The invention discloses a pre-welding pretreatment process for a pipeline and a pipe fitting. The pre-welding pretreatment process is used for pre-welding pretreatment of the metallic pipeline or pipe fitting in the pipeline laying process. The treatment process comprises the treatment procedures of degreasing, acid pickling and passivating, the treatment procedures are conducted according to the order of acid pickling treatment, degreasing treatment and the passivating treatment, and washing procedures are conducted between any two procedures. The treatment process further comprises a sealing procedure of the pipeline or pipe fitting after the passivating treatment procedure. The treatment process is simple, and the total pretreatment time of the pipeline or pipe fitting can be obviously shortened; and meanwhile, pre-welding oxidation protection of the pipeline or pipe fitting after pretreatment is facilitated.

Description

technical field [0001] The invention relates to the technical field of mechanical engineering pipeline erection, in particular to a pre-welding pretreatment process for pipelines and pipe fittings. Background technique [0002] After the installation of equipment or process pipelines, before leak testing and pressure testing, the pipelines should be purged to remove iron filings, rust, welding slag and other sundries left in the equipment and pipelines, so as to prevent the above sundries from being trapped in the pipeline. During use, the pipeline will be blocked by the fluid, and the valves and instruments will be damaged to ensure the safe operation of special equipment, instruments, regulating valves, pumps, filters and other equipment, and it is also beneficial to the quality of the product. [0003] For process pipelines used for the transportation of flammable and explosive gases, it is generally necessary to pickle, degrease, and passivate the pipeline before the abo...

Claims

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Application Information

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IPC IPC(8): B23K31/02B23K101/06
CPCB23K31/027
Inventor 黄鸣
Owner 黄鸣
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