Why Is It Necessary To Check Whether The Pre-insulated Bushing Has Shrunk Evenly?

When inspecting pre insulated sleeve, the diameter changes and shrinkage marks in different parts must be compared segment by segment. By comparing with the original installation dimensions and reading on-site measurement data, locations where the expected shrinkage level has not been reached can be identified. This process can analyze whether the heating field of pre insulated junction sleeve is uniform, thereby determining whether there are problems such as improper heat treatment or inconsistent influence of environmental heat sources.

Using measuring tools suitable for insulated joint sleeve, such as digital calipers or laser measuring equipment, this inspection task can be completed efficiently on the construction site. Technicians typically collect data along the pipeline at fixed intervals to form a complete shrinkage data curve, which is then compared and analyzed with the design curve to provide a basis for construction quality control.