Quality control of prefabrication in pipeline plant

Strengthen the management of construction personnel around the key points of the project construction. Strict management is carried out on the operators who enter the construction site, so as to achieve three no entering the factory, namely: do not enter the factory without quality awareness education, welders do not enter the factory without qualified certificates within the validity period, welders do not enter the factory without passing the actual skills examination; Strengthen the management of equipment and materials. Assign special personnel to regularly maintain machines, tools, and equipment; Strengthen the control of the prefabrication process, "to unified management, precast, flow prefabrication, four not factories", pipeline prefabrication management; Strictly implement the welding quality reward and punishment system.

Personnel management

(1) Operators and inspectors should undergo qualification training corresponding to the positions they are engaged in.

(2) The welder shall work with a certificate, and the welding work shall meet the scope requirements of the qualified items on the welder certificate.

(3) Nondestructive testing personnel should be on duty with certificates and corresponding testing qualifications.

(4) Personnel without training shall not be engaged in welding or inspection work.

Single line chart management

(1) After receiving the construction drawing, draw the single-line drawing.

(2) After drawing the single line drawing, proofread the single line drawing to ensure its correctness. The division of field and prefabricated welds should be reasonable.

(3) After proofreading the single-line drawing, the drawing is ready for prefabrication.

(4) Single-line drawings shall be classified and saved in electronic versions according to the project.

Material management

(1) All raw materials shall be inspected according to relevant standards to ensure the quality of raw materials, and a material warehousing ledger shall be established.

(2) All raw materials shall have a quality certificate.

(3) Prepare materials after receiving engineering construction drawings.

(4) When the pipeline is prefabricated, materials shall be issued according to the material requisition sheet, and the material requisition ledger shall be established.

(5) Recycling records should be made during material recovery, and material inventory books should be established.

Equipment management

(1) When all equipment is put into storage, set up the warehouse entry ledger and file the operation manual.

(2) Establish an equipment operation ledger when all equipment is in use.

(3) When using the equipment, operate in strict accordance with the operating procedures.

(4) All equipment shall be managed by special personnel.

Pipe prefabrication management

(1) Cutting material

(2) According to the material claim sheet, get the materials of the prefabricated pipeline.

(3) According to the feeding table, feeding should be based on the actual size of accessories (elbow, tee, etc.) to modify the size of the feeding.

(4) All pipes and fittings after blanking are polished according to the relevant welding process cards, as well as the internal and external surfaces of the groove.

Pair up

(1) Pair pairs according to the single-line diagram.

(2) After the completion of the group, a self-check was performed, and the size and Angle of the pipe segment were checked according to the single-line diagram.

Welding

(1) Carry out welding work according to the welding process card. Welding is carried out strictly according to the parameters of the process card, and parameters shall not be changed.

(2) The welder shall make welding records in the welding process.

(3) Welder self-check after welding. Welders SHOULD CLEAN UP their welds (mouth), including drug skin, splashes, etc., and repair any defects exceeding the standard.

Inspection

(1) Check the relevant size of the preformed pipe according to the single line diagram. If the size is not found, timely repair.

(2) Check the appearance quality of the weld (mouth), such as found that the appearance quality does not meet, timely repair.

(3) If the pipe size and weld (edge) appearance inspection is qualified, entrust nondestructive testing, and fill in the nondestructive testing order, in duplicate, one copy to the nondestructive testing institution, and one copy of the archive room.

(4) After nondestructive testing found unqualified weld (mouth), fill in the welding repair form, welding repair. After repair, conduct appearance, and non-destructive testing as required. All repair records and reports shall be filed.

(5) All self-inspection and special inspection reports of quality inspectors should be submitted to the reference room for archiving.

Sandblasting and painting

(1) According to the relevant standards or technical requirements, sandblasting and painting of the precast pipeline are qualified by inspection.

(2) The sealing surface of the pipeline should not be damaged when sandblasting.

(3) When painting, select the corresponding paint and coating layer according to the requirements.

(4) Do not paint the sealing surface of the pipeline and the groove surface of the field welding joint when painting.

Management of unqualified inspection

(1) After inspection of unqualified, all requirements for repair.

(2) Analyze the causes of nonconformity, fill in the repair notice, repair, and repair data archiving.

(3) Prefabricated pipeline after all qualified inspection into the next process.

(4) If the quality of a prefabricated pipeline is not qualified due to human factors, the operator shall be held responsible.

Pipeline handover management

(1) The pipeline that passes the inspection shall be transferred to the site installer for installation by combining the single line drawing and relevant data.

(2) When pipeline handover, sign and receive the handover record, which will be archived in the reference room.

Data management

(1) The data should be complete and correct.

(2) Classification and archiving of data.

(3) The data include all the original data and electronic data.

(4) Data to accept the relevant personnel at any time to call, and accept the superior supervision department spot check.

(5) The data preservation period is consistent with that of the project.

(6) The information is strictly confidential and strictly prohibited to be leaked.