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When it comes to ordering a new manhole cover, there are various options to consider. These options or specs determine the design and measurements of each manhole cover. One example is how a cover is secured in its frame. Some covers lay in the frame and others bolt down. Let’s explore additional differences that could help you decide which feature is most appropriate for your space!
Lay-In Manhole Covers:
Lay-in manhole covers are designed to rest in the manhole’s frame, allowing utility workers to access the utilities beneath without tools. There is no hardware, which means no tools are required to access the utilities beneath since gravity holds the cover in place. Although lay-in manhole covers may not be watertight, they are ideal for workers requiring regular underground infrastructure access. Lay-in covers are most commonly installed where utilities are accessed frequently, and security and water intrusion are not a concern.
Bolt-Down Manhole Covers:
In areas where keeping unauthorized access out is imperative, bolt-down manhole covers are a step up from lay-in covers in a sense of security. Hex bolts, also known as fasteners, are provided to secure the cover. The fasteners are inserted through the cover and threaded into the frame. The cover’s bolt holes are counter-bored, so the head of the bolt is recessed.
In addition to security, another added feature to bolt-down manhole covers is the gasket. A Buna-N gasket with bolt-down frames and covers is included. The ⅛” thick gasket is glued to the frame. When the bolts around the cover are tightened, the gasket creates a seal under the cover, preventing water from accessing the utilities beneath the manhole.
While lay-in covers have standard pick holes or round bar handles that may let in water, bolt-down covers are solid or come with watertight picking eye handles.
Let us know if you need assistance choosing features that suit your project needs. Request a quote today!
