CN105729052A - Technology for cutting and groove processing of pipeline - Google Patents

Abstract

The invention discloses a technology for cutting and groove processing of a pipeline. The technology mainly comprises the step that (1) an original mark shall be transplanted before the cutting of the pipeline, so that a material of the pipeline can be recognized correctly. The technology comprises the step that (2) a groove type shall satisfy the condition that a V-shaped groove is adopted when the pipeline wall thickness T is not less than 9mm, the groove angle alpha is 65-75 DEG, a root face shall satisfy that p is 0-3 mm, and an assembly interval c is 0-2 mm; and a V-shaped groove is adopted when T is larger than 9 mm and not larger than 20 mm, the groove angle alpha is 55-65 DEG, the root face satisfies that p is 0-3 mm, and the assembly interval c is 0-3 mm. The technology comprises the steps that (3) cutting and groove preparation of carbon steel are carried out through mechanical processing or flame cutting; (4) cutting and groove preparation of alloy steel can be carried out by the mechanical processing, and a dedicated grinding wheel shall be used for abrasive cutting or grinding of stainless steel, and mutual use with the carbon steel cutting is not allowed; and (5) sundries such as oil stains, rust, sandy soil, water stains and oxide skin within the scope of 20 mm away from the groove and the edges of inner and outer side surfaces of a welding joint shall be removed by corresponding tools before pipeline assembly.

Description

The cutting of a kind of pipeline and retaining wall on slope technique

Technical field

The present invention relates to the cutting of a kind of pipeline and retaining wall on slope technique.

Background technology

The cutting of existing pipeline and retaining wall on slope technique exist that procedure arrangement is unreasonable, operation is various, technological parameter selects unreasonable, the collocation of each technological parameter is unreasonable and operator's skill requirement is higher so that production cost is higher, product quality is on the low side, yield rate is not high.

Summary of the invention

Because the drawbacks described above of prior art, the technical problem to be solved be to provide a kind of operation rationally, the cutting of the pipeline of low cost of manufacture and retaining wall on slope technique.

For achieving the above object, the invention provides

The cutting of a kind of pipeline and retaining wall on slope technique, comprise the steps:

1), original labelling should be transplanted before pipe cutting, to ensure correctly identification pipe material；

2), slope type

As thickness of pipe wall T≤9mm, adopting double V-groove, bevel angle α=65-75 °, root face р=0-3mm, group are to gap с=0-2mm；

As 9 < T≤20mm, adopting double V-groove, bevel angle α=55-65 °, root face р=0-3mm, group are to gap с=0-3mm；

3), carbon steel adopts machining process or flame cutting method cutting and prepares groove；

A cut surface should be smooth, flawless, pipe, concavo-convex, reducing, slag, burr, ferrum oxide,

Iron filings etc.；According to flame cutting, after flame cutting, machining or polishing process should be adopted to remove heat affected area；

B otch end face dip deviation should be not more than the 1% of tube outer diameter, and cannot be greater than 3mm；

4), steel alloy should adopt machining process cutting and prepare groove；When rustless steel adopts emery wheel cutting or reconditioning, special grinding wheel sheet should be used, must not with the mutual use of carbon steel；

5), before pipe string, in welding point, outer surface adopts corresponding tool to remove the foreign material such as groove and edge 20mm greasy dirt, rust, sand, water mark, oxide skin；

6), the processing of jacket pipe should meet the regulation of design document；

In a, pipe pipe fitting should use seamless or seamless butt-welding pipe fitting, must not use miter elbow；Interior pipe weld seam after Non-Destructive Testing and pressure testing are qualified, should can assemble outer tube；

Gap between b outer tube and interior pipe should be uniform, and should specify Weld-supporting block by design document；Rest pad must not hinder chuck；

The breathing of media flow and interior pipe and outer tube in c；The material of rest pad should be identical with interior tubing matter；

D ordinary circumstance, rest pad and bend pipe inflection point distance are preferably 0.5～1.2m, and on straight length, rest pad spacing is preferably 3～5m.

The invention has the beneficial effects as follows: operation of the present invention is reasonable, low cost of manufacture, each parameter collocation reasonable coordination, it is possible to be effectively improved product quality and production efficiency.

Detailed description of the invention

Below in conjunction with embodiment, the invention will be further described:

The cutting of a kind of pipeline and retaining wall on slope technique, comprise the steps:

1), original labelling should be transplanted before pipe cutting, to ensure correctly identification pipe material；

2), slope type

As thickness of pipe wall T≤9mm, adopting double V-groove, bevel angle α=65-75 °, root face р=0-3mm, group are to gap с=0-2mm；

As 9 < T≤20mm, adopting double V-groove, bevel angle α=55-65 °, root face р=0-3mm, group are to gap с=0-3mm；

3), carbon steel adopts machining process or flame cutting method cutting and prepares groove；

A cut surface should be smooth, flawless, pipe, concavo-convex, reducing, slag, burr, ferrum oxide,

Iron filings etc.；According to flame cutting, after flame cutting, machining or polishing process should be adopted to remove heat affected area；

B otch end face dip deviation should be not more than the 1% of tube outer diameter, and cannot be greater than 3mm；

4), steel alloy should adopt machining process cutting and prepare groove；When rustless steel adopts emery wheel cutting or reconditioning, special grinding wheel sheet should be used, must not with the mutual use of carbon steel；

5), before pipe string, in welding point, outer surface adopts corresponding tool to remove the foreign material such as groove and edge 20mm greasy dirt, rust, sand, water mark, oxide skin；

6), the processing of jacket pipe should meet the regulation of design document；

In a, pipe pipe fitting should use seamless or seamless butt-welding pipe fitting, must not use miter elbow；Interior pipe weld seam after Non-Destructive Testing and pressure testing are qualified, should can assemble outer tube；

Gap between b outer tube and interior pipe should be uniform, and should specify Weld-supporting block by design document；Rest pad must not hinder chuck；

The breathing of media flow and interior pipe and outer tube in c；The material of rest pad should be identical with interior tubing matter；

D ordinary circumstance, rest pad and bend pipe inflection point distance are preferably 0.5～1.2m, and on straight length, rest pad spacing is preferably 3～5m.

Claims (1)

1. the cutting of a pipeline and retaining wall on slope technique, it is characterised in that comprise the steps:

1), original labelling should be transplanted before pipe cutting, to ensure correctly identification pipe material；

2), slope type

As thickness of pipe wall T≤9mm, adopting double V-groove, bevel angle α=65-75 °, root face р=0-3mm, group are to gap с=0-2mm；

As 9 < T≤20mm, adopting double V-groove, bevel angle α=55-65 °, root face р=0-3mm, group are to gap с=0-3mm；

3), carbon steel adopts machining process or flame cutting method cutting and prepares groove；

A cut surface should be smooth, flawless, pipe, concavo-convex, reducing, slag, burr, ferrum oxide,

Iron filings etc.；According to flame cutting, after flame cutting, machining or polishing process should be adopted to remove heat affected area；

B otch end face dip deviation should be not more than the 1% of tube outer diameter, and cannot be greater than 3mm；

4), steel alloy should adopt machining process cutting and prepare groove；When rustless steel adopts emery wheel cutting or reconditioning, special grinding wheel sheet should be used, must not with the mutual use of carbon steel；

5), before pipe string, in welding point, outer surface adopts corresponding tool to remove the foreign material such as groove and edge 20mm greasy dirt, rust, sand, water mark, oxide skin；

6), the processing of jacket pipe should meet the regulation of design document；

In a, pipe pipe fitting should use seamless or seamless butt-welding pipe fitting, must not use miter elbow；Interior pipe weld seam after Non-Destructive Testing and pressure testing are qualified, should can assemble outer tube；

Gap between b outer tube and interior pipe should be uniform, and should specify Weld-supporting block by design document；Rest pad must not hinder chuck；

The breathing of media flow and interior pipe and outer tube in c；The material of rest pad should be identical with interior tubing matter；

D ordinary circumstance, rest pad and bend pipe inflection point distance are preferably 0.5～1.2m, and on straight length, rest pad spacing is preferably 3～5m.