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Process Monitoring Requirements for 2PE and 3PE Anti corrosion Pipes of Zhongyuan Pipeline Manufacturing Co., Ltd
keyword Zhongyuan Pipeline Manufacturing Co., Ltd Category Anti-coating pipe quality Related products Get a quote| Process monitoring requirements for 2PE and 3PE anti-corrosion pipes | ||||
| No. | Process name | Inspection items | Inspection frequency | Control content |
| 1 | Steel pipe acceptance | Standards, materials, geometric dimensions, and | each batch | Comply with standards or contract requirements, and have a product quality certificate. |
| Quality certificate, etc | ||||
| Visual inspection | Each one | Should comply with the corresponding standard requirements. Unqualified products cannot be coated with anti-corrosion layer | ||
| weld reinforcement | Each one | Not exceeding 2.5mm, and the weld seam should have a smooth transition. | ||
| 2 | Acceptance of anti-corrosion coating materials | Epoxy powder coating | Each production batch shall not exceed | Product quality certificate and inspection report, user manual, factory certificate of conformity, production date and validity period. The supplier of epoxy powder coating provides information such as thermal characteristic curves. The packaging is intact and stored according to the manufacturer's instructions. Before use, it should be tested by an inspection agency that has passed national metrological certification according to the corresponding performance items specified in the standards. The performance should meet the specified requirements. |
| 20t once | ||||
| an adhesive | Each production batch shall not exceed | |||
| 30t once | ||||
| polyethylene | Each production batch shall not exceed | |||
| 500t once | ||||
| Applicability test | each batch | The performance of polyethylene layer and anti-corrosion layer should meet the standard requirements, and the coating process parameters should be determined. | ||
| 3 | Surface treatment of steel pipes | clean up | Each one | The surface is free of attachments such as grease and dirt |
| Surface temperature of steel pipe | Each one | The surface temperature of the steel pipe shall not be lower than 3 ℃ above the leakage point temperature | ||
| Surface rust removal grade | Each one | The surface rust removal grade should reach Sa2.5 level. After surface treatment, the steel pipe surface should be protected from moisture, rust, or secondary pollution. After surface treatment, the steel pipe should be coated within 4 hours. If rust or surface contamination occurs after 4 hours, the surface treatment should be repeated. | ||
| Surface anchor depth | At least 3 times per class, | Should comply with standards or contractual requirements | ||
| Two steel pipes each time. | ||||
| Surface dust level | At least 3 times per class, | Should meet the standard requirements | ||
| Two steel pipes each time. | ||||
| salinity | Once every 50 units, | Not exceeding 20mg/m ². | ||
| One steel pipe each time. | ||||
| 4 | Coating process control | Steel pipe heating | 100% | The heating temperature of the steel pipe before coating shall be within the recommended range of the supplier, but shall not exceed 275 ℃, and shall be checked and recorded at least once every hour |
| Process parameter monitoring | 100% | Produce anti-corrosion coating according to the process parameters determined by applicability testing. Check and record at least once every hour | ||
| cooling | 100% | After the polyethylene layer is coated, it should be cooled with water to a temperature of no more than 60 ℃ in the steel pipe, and the fusion bonded epoxy coating should be fully cured. | ||
| 5 | End face treatment | Reserved length at the pipe end | Each one | Should meet the standard requirements |
| End face chamfer of polyethylene layer | Each one | The chamfer on both ends shall not exceed 30 ° | ||
| 6 | Process inspection | Leakage point inspection of anti-corrosion coating | 100% | The leak detection voltage is 25kV, with no leakage points |
| Visual inspection of anti-corrosion coating | 100% | The surface should be smooth, without bubbles, pockmarks, wrinkles, uniform color, and defects such as cracking and shrinkage. | ||
| Thickness inspection of anti-corrosion coating | The first, fifth, and tenth roots, | The thickness of the anti-corrosion layer at least 10 points evenly distributed in the circumferential direction of the 3 sections of each steel pipe, and the thickness of the anti-corrosion layer at the weld joint shall be tested. The measurement shall be taken at 4 points more than 1 meter away from the pipe end, and the results shall meet the requirements of the standard | ||
| Afterwards, at least one out of every ten samples should be tested | ||||
| Cathodic peel strength test | At least 2 temperatures per shift | Should meet the requirements of standard regulations | ||
| Extract once each under certain conditions | ||||
| 7 | INSPECTION | Thickness inspection of epoxy powder coating | At least once per class | Should meet the requirements of standard regulations |
| Thickness of epoxy powder coating and | At least once per class | Should meet the requirements of standard regulations | ||
| Thermal characteristic test | ||||
| 48 hour cathodic stripping test | Every 10km, 20km, and 30km of continuous production | It should comply with the requirements of the standard regulations. | ||
| Perform once; Afterwards, conduct once every 50km. | ||||
| Tensile strength and elongation at break | At least once every 50km of continuous production | It should comply with the requirements of the standard regulations. | ||
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