Hebei Hankai high speed rotary shaft seals

The Functionality of Manhole Covers

Ductile iron, an alloy of iron that contains small amounts of carbon and silicon, has emerged as a crucial material in the manufacturing of utility covers and frames. With urbanization on the rise and cities continuously expanding, the demand for durable and reliable infrastructure components such as manhole covers, drain covers, and access frames has never been more pronounced. This article delves into the various advantages of ductile iron covers and frames and their significance in urban infrastructure.

1. Deterrence Against Unauthorized Access The mere presence of a security post can deter potential intruders. A locked or raised post signals that access is restricted, making it less likely for thieves or vandals to target your property. When blended with other security systems, such as cameras and alarms, telescopic security posts form an effective barrier against crimes.

According to Atlas Obscura, manholes date back to the mid-19th century when cities around the world were building underground sewage systems. Engineers realized that they needed to access the sewer systems for the purpose of inspecting the pipes during normal maintenance. Consequently, cities began digging access holes that could accommodate a human (as these workers were typically men, the access points were called manholes) and these became the portals through which engineers or inspectors could crawl to investigate the pipes.