{"id":6437,"date":"2022-10-10T17:29:26","date_gmt":"2022-10-10T14:29:26","guid":{"rendered":"https:\/\/uti.ua\/renovation-of-steel-pipes\/"},"modified":"2025-05-23T18:36:15","modified_gmt":"2025-05-23T15:36:15","slug":"renovation-of-steel-pipes","status":"publish","type":"page","link":"https:\/\/uti.ua\/en\/renovation-of-steel-pipes\/","title":{"rendered":"Renovation of steel pipes"},"content":{"rendered":"

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Renovation of steel pipes<\/h2><\/div>

\u00d8 219-1420 mm<\/strong><\/p>\n<\/div><\/div><\/div><\/div><\/div>

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Renovation of steel pipes<\/h2><\/div>

In 2010, our company set up a site to restore steel pipes that were in service.<\/p>\n

This made it possible to transfer a certain amount of repair work from the highway to the stationary factory conditions.<\/p>\n

This way makes it possible to increase the productivity and quality of repair and restoration work on main pipelines while reducing costs by preserving the main component of the pipeline, namely pipes.<\/p>\n<\/div><\/div><\/div><\/div><\/div>

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Stages of work<\/p>\n<\/div>

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Workson the restoration of steel pipes<\/h2><\/div><\/div><\/div>

Pipe restoration workis carried out in several stages:<\/p>\n<\/div>

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Stage – 1<\/span><\/a><\/div>
Visual control<\/h5><\/div>

Assessment of pipe appearance, mechanical damage, metallurgical defects and corrosion. Rejection is carried out in accordance with VNS 012-88 part 1 clause 4.6.<\/p>\n<\/div><\/div><\/div>

Stage – 2<\/span><\/a><\/div>
Instrumental control<\/h5><\/div>

It is carried outto determine the ovality at the ends, the curvature of the pipe, the size of the defects detected during visual inspection. Rejection is carried out in accordance with VNS 012-88 part 1 clause 4.5.<\/p>\n<\/div><\/div><\/div>

Stage – 3<\/span><\/a><\/div>
Pipe cleaning<\/h5><\/div>

The pipes are cleanedof insulation coating residues and dirt using a high-pressure water jet (which does not disturb the surface structure of the pipe metal).<\/p>\n<\/div><\/div><\/div>

Stage – 4<\/span><\/a><\/div>
Measuring and selective control<\/h5><\/div>

Conducting 100% visual and spot checks with an ultrasonic thickness gauge. Based on the results of the instrumental and instrumental inspection, defect reports for the diagnosed pipe are drawn up.<\/p>\n<\/div><\/div><\/div>

Stage – 5<\/span><\/a><\/div>
Replacement of defective pipe sections<\/h5><\/div>

Pipe sectionswith defects that do not meet the requirements of regulatory documents must be removed. Defective pipe sections shall be replaced with coils.<\/p>\n<\/div><\/div><\/div>

Stage – 6<\/span><\/a><\/div>
Welding pipe joints<\/h5><\/div>

Welding of pipe joints and welding of coils is performed in accordance with VNS 006-89 according to separate instructions. Welding equipment and welding methods are protected by patents of Ukraine.<\/p>\n<\/div><\/div><\/div>

Stage – 7<\/span><\/a><\/div>
Ultrasound and X-ray inspection<\/h5><\/div>

All welded ring joints during pipe welding and coil welding are subject to 100% X-ray and ultrasonic inspection in accordance with VSN 012-88. The quality control of welding operations is carried out by operational control, external inspection, checking the integrity of the welded metal using physical non-destructive testing methods (ultrasonic testing, radiographic testing).<\/p>\n<\/div><\/div><\/div>

Stage – 8<\/span><\/a><\/div>
Repair of the pipe body<\/h5><\/div>

The pipe body is repairedby manual arc welding in accordance with RD 51-108-86 (Instruction on the technology of welding and cutting pipes during repair and restoration works on main gas pipelines). The repaired sections are grinded using angle grinders.<\/p>\n<\/div><\/div><\/div>

Stage – 9<\/span><\/a><\/div>
Mechanical processing of pipe edges<\/h5><\/div>

After all the restoration work is completed, the pipe edges are machined using machine tools.<\/p>\n<\/div><\/div><\/div>

Stage – 10<\/span><\/a><\/div>
Preparing for the application of an anti-corrosion coating<\/h5><\/div>

The repaired pipes are subjected to shot blasting, dust removal and degreasing, which allows us to clean the surface of the pipes and prepare them for anti-corrosion coating.<\/p>\n<\/div><\/div><\/div>

Stage – 11<\/span><\/a><\/div>
Hydraulic testing<\/h5><\/div>

At the customer’s request, the pipes are additionally hydrotested in accordance with the ND.<\/p>\n<\/div><\/div><\/div>

Stage – 12<\/span><\/a><\/div>
Formalisation of the conclusion<\/h5><\/div>

Issuance of a conclusion on the numbered pipe indicating all geometric and mechanical parameters of the pipe, repair sites, references to non-destructive testing protocols and permissible operating pressure.<\/p>\n<\/div><\/div><\/div><\/div><\/div>

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Corrosion-resistant insulation<\/p>\n<\/div>

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Anti-corrosion coating of reconditioned steel pipes<\/h2><\/div>

The rehabilitated pipes can be coated with an external anticorrosive coating of extruded polyethylene in accordance with TU U-27.2-31017014-001: 2005 or an external polyurethane coating using an airless application system. It is also possible to apply an internal anticorrosive coating with epoxy compositions in accordance with TU U-27.2-31017014-003: 2011.<\/p>\n<\/div>