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 o

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0015] Example 1:

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

[0017] Specifically, in this treatment process, the pickling process is set before the degreasing process, and in the case of severe rust before some pipes or pipe fittings enter the site or before pretreatment, first pickling and rust removal can clean the pipes more thoroughly. Or rust and dirt on the surface of the pipe fittings. In this way, setting the degreasing treatment process after the pickling will help speed up the efficiency or speed of degreasing. In this way, the pretreatment time of the entire pipeline or pip...

Example Embodiment

[0019] Example 2:

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

[0021] Further, the inert gas protection is nitrogen filling protection for the inside of the pipeline or pipe fitting.

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

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