The quality control requirements for pipeline factory prefabrication are as follows:

Strengthen the management of construction personnel around the key points of project construction. Strictly manage the operators entering the construction site, so as not to enter the factory, I .e. not to enter the factory without quality awareness education, not to enter the factory without welder's valid certificate, and not to enter the factory without license. Pass the practical skills test. Strengthen the management of equipment and materials in the factory. Set up special personnel to carry out regular maintenance of machinery and equipment; strengthen the control of prefabrication process, do a good job in the management of pipeline factory prefabrication; strictly implement the welding quality reward and punishment system.

1. personnel management

(1) Operators and inspectors shall receive qualification training appropriate to their positions.

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

(3) Non-destructive testing personnel shall be certified and have corresponding testing qualifications.

(4) Untrained personnel shall not engage in welding or inspection work.

2. single-line diagram management

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

(2) After the single-line drawing is finished, proofread the single-line diagram to ensure the correctness of the single-line diagram. The segmentation of field welded joints and prefabricated welded joints shall be reasonable.

(3) After the proofreading of the single-line diagram is completed, the drawing can be made.

(4) The single-line diagram shall be stored in electronic version according to the project classification.

3. material management

(1) All raw materials shall be inspected in accordance with relevant standards to ensure the quality of raw materials and establish a material storage ledger.

(2) All raw materials shall have quality certificates.

(3) Prepare materials after receiving the construction drawings.

(4) When the pipeline is prefabricated, the materials shall be distributed according to the picking list and the picking ledger shall be established.

(5) When recovering materials, make recovery records and establish material inventory accounts.

Process control of pipeline factory prefabrication

(1) Precast precision control

Strengthen the process control of blanking size, pipe welding group deviation and welding deformation, and adopt the method of combining mold and template to reduce the influence of personnel skill level on welding deformation. Prefabricated work. The precision of prefabrication is improved by means of blanking measuring table, mold opening, automatic cutting and groove processing. Design and manufacture special tire pairs and fixtures to control the quality and welding deformation of the pair. Strengthen the measurement of the geometric dimensions of the finished pipe section to ensure that the prefabrication accuracy meets the requirements of the design specifications.

(2) Division of prefabricated pipeline for pipeline factory

Prefabricated pipe sections shall meet the requirements for transportation, hoisting and site installation. The depth division of pipeline prefabrication shall be formulated after comprehensively considering the transportation route, site equipment and environmental factors, and is generally a two-dimensional structure. The relevant welded pipe fittings shall be welded to the main pipe, and the branch pipes shall be welded to a small size. When the installation deviation of on-site equipment and steel structure is not determined, the installation adjustment section or adjustment allowance shall be reserved, and the materials shall be accurately cut on site after on-site measurement during installation. When the material is special or cannot be processed on site, the method of reserving the installation and adjustment section can be selected. Ordinary material pipe generally reserved 50mm installation allowance. The reserved adjustment section or installation allowance shall meet the needs of three-dimensional space adjustment, and the installation adjustment amount shall be reserved at the location convenient for measurement and installation of the pipeline in three-dimensional direction.

(3) Design change of pipeline factory prefabrication

Design changes are a common situation in construction, especially problems in equipment and steel structure construction, which are usually solved by pipeline changes. The change management of pipeline prefabrication needs to be timely and accurate. If the change notice is received before the single-line diagram is prefabricated, the single-line diagram should be revised in time to prevent rework.