Design quality lacks effective supervision and management; in
PU Insulated Steel Pipe During the construction stage of the pipe-network project, frequent coordination problems among PU sections, civil works, and subsequent equipment installation result in repeated rework. This is mainly because drawings submitted by the design unit were not completed through audit quality management, and construction drawings submitted were not coordinated among the parties.
Lack of maintenance and management of machinery and equipment: the nature of PU direct-buried insulated pipe network projects determines the characteristics of the external heating-network equipment and the special requirements of pipeline construction. Coordination of construction, transport vehicles, excavators, pipe fitters, welders, and other heavy machinery is required, and equipment performance directly affects construction quality. Because large equipment is relatively expensive, older, poorer-quality equipment is often rented from contractors to save cost, which reduces construction quality.
Loopholes in material management: Because construction of PU direct-buried insulated pipe network projects is characterized by covering several kilometers at the same time and also requires large quantities of materials and equipment, a large amount of materials will enter the site at the same time during peak construction. Material management is relatively chaotic, effective control of material quality cannot be guaranteed, and hidden dangers to construction quality arise.
Lack of targeted construction technology: Some external heating-network pipeline projects overemphasize construction techniques when it comes to construction quality, while neglecting the economic rationality of the process, resulting in high special construction costs. Other construction quality problems during construction cannot be improved in time through construction techniques, with the consequence that particular problems recur.
