How to clean and repair cs pipes?

Date:2024-01-22Tags:cs pipe
How to clean and repair cs pipes?

CS pipes refer to round, square, and rectangular steel materials with hollow sections and no seams around them. CS pipes are made from steel ingots or solid tube blanks through perforation into capillary tubes, and then hot rolled, cold rolled or cold drawn. Compared with solid steel materials such as round steel, CS pipes have a hollow cross-section and are widely used as pipes for transporting fluids. Compared with solid steel materials such as round steel, it is lighter in weight with the same bending and torsional strength. It is an economical steel that is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, bicycle frames, construction steel scaffolding, etc.


cs pipe


Cleaning of cs pipes

1) Cleaning

Use solvents and emulsions to clean the surface of steel pipes to remove oil, grease, dust, lubricants and similar organic substances. However, it cannot remove rust, oxide scale, flux, etc. on the surface of steel pipes, so it is only an auxiliary in the anti-corrosion production of steel pipes. method.

2) Tool rust removal

Mainly use tools such as wire brushes to polish the steel surface to remove loose or raised oxide scale, rust, welding slag, etc. The rust removal of hand tools can reach Sa2 level, and the rust removal of electric tools can reach Sa2 level and Sa3 level. If there is a strong iron oxide scale adhered to the surface of the steel, the rust removal effect of the tool will not be ideal and the depth of the anchor pattern required for anti-corrosion construction will not be achieved.

3) Pickling

Pickling treatment generally adopts two methods: chemical method and electrolysis method. Pipeline anti-corrosion only uses chemical pickling, which can remove scale, rust and old coatings. Sometimes it can also be used as a reprocessing after sand blasting and rust removal. Although chemical cleaning can achieve a certain degree of cleanliness and roughness on the surface, its anchor lines are shallow and can easily pollute the environment.

4) Spray (throw) rust removal

Rust blasting (blasting) uses a high-power motor to drive the blasting (throwing) blades to rotate at high speed, so that abrasives such as steel sand, steel shots, wire segments, minerals, etc. are sprayed (thrown) on the surface of the steel pipe under the action of centrifugal force. , not only can rust, oxides and dirt be completely removed, but the steel pipe can also achieve the required uniform roughness under the action of abrasive impact and friction; after spraying (throwing) rust removal, it can not only expand the physical adsorption effect on the pipe surface , and can enhance the mechanical adhesion between the anti-corrosion layer and the pipe surface. Therefore, spraying (throwing) rust is an ideal rust removal method for pipeline anti-corrosion. Generally speaking, shot blasting (sand) rust removal is mainly used for inner surface treatment of pipelines, and shot blasting (sand) rust removal is mainly used for outer surface treatment of pipelines. Several issues that should be paid attention to when using spray (thrown) rust removal.

Repair of cs pipes

1) The welding process and welding parameters used in repair must be combined with relevant welding examples;

2) The welder who repairs stainless steel cs pipes must have a certificate of qualification for the corresponding project; and it must be held by someone with excellent welding quality. One repair is enough;

3) Use non-destructive testing technology to find all cracks and determine their exact location;

4) Select the filling material that conforms to the process example, that is, the welding rod, and apply it after drying according to regulations;

5)The welding conditions for stainless steel cs pipe crack repair must meet the welding requirements, such as temperature, rainfall, wind speed, etc.

Introduction to cs pipe length

The definition and characteristics of cs pipe

1. Definition of cs pipe
cs pipe refers to a long strip of steel with a hollow section and no seams around it.

2. Characteristics of cs pipes
The thicker the wall thickness of the product, the more economical and practical it is. The thinner the wall thickness, the higher the processing cost. Secondly, the product's technology determines its limited performance. Generally, the precision of seamless steel pipes is low: the wall thickness is uneven, and the internal and external brightness of the pipe is low. , the sizing cost is high, and there are pits and black spots inside and outside. The outside is not easy to remove; third, its detection and shaping must be processed offline. Therefore, it reflects its superiority in high pressure, high strength, and mechanical structural materials.

cs pipe length

1. Commonly used lengths of seamless steel pipes (also called non-fixed lengths): Any length within the length range specified by the standard and without fixed length requirements is called a common length; for example, the structural pipe standard stipulates: rolling (extrusion, extrusion, Expanded) steel pipe 3000mm~12000mm; Cold drawn (rolled) steel pipe 2000mm~10500mm.

2. Fixed length of seamless steel pipe: The fixed length should be within the usual length range, that is, a certain fixed length required in the contract. However, it is impossible to cut an absolute fixed length in actual operation, so the standard stipulates the allowable positive deviation value of the fixed length.

3. Double-foot length of seamless steel pipe: The multi-foot length should be within the usual range, and the single-foot length and multiples of the total length should be indicated in the contract (for example, 3000mm × 3, which is a multiple of 3000mm, and the total length is 9000mm). In actual operation, an allowable positive deviation of 20mm should be added to the total length, and a notch margin should be reserved for each single foot length.

4. GB/T 8163-2008 Seamless steel pipes for conveying fluids:
① Steel pipes are divided into two types: hot rolled and cold drawn. Its specifications should comply with the provisions of GB/T 17395.
②The commonly used lengths of steel pipes are as follows:

Hot rolled steel pipe 3000~12000mm, cold drawn steel pipe 3000~10500mm.


We use cookies to offer a better browsing experience, analyze site traffic, and personalize content. By using this site, you agree to our use of cookies.

Accept
Decline