Manway are chambers made of masonry and RCC, designed according to convenience a human being may access a utility area for maintenance purposes. They are known by several different names: manways, manholes, handholes, access ports, etc. but their function is the same. Giving your customer access to the interior of the vessel is critical to conducting the operation.
Types
There are various types of manholes or manway covers categorized as:
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Shallow manway: It is of shallow depth. Provided at the start of branch sewer or at a site that does not have much heavy traffic. It is also known as the inspection chamber with a light cover at its end.
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Normal Manway: It is of a normal height with a hardcover on top. Normally of a square (or rectangular) form.
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Deep Manway: It is fitted with a thick cover at the top and has a deep height.
Factors that need to be noted for selecting Tank Manhole Covers:
Manway covers are flexible covering that acts as manway cap. Serving many functions, especially to avoid pedestrians from slipping and of preventing unauthorized workers from entering manholes and maintaining sewage or stormwater services secure in addition. While choosing a manway cover there are certain things one should consider.
1) The Chemical Being Stored
The type of chemical you’re storing is a major factor that determines what manway cover you need for your storage tank. Certain chemicals require their own specially designed systems. For instance, storage that holds water requires a different safety element than a corrosive or harmful chemical, like hydrochloric acid requires different safety elements.
2) How the Tank Is Filled
A lot of times chemicals require a manway cover based on the process of how the tank is filled. There are three different methods of filling chemical storage tanks and each requires different safety methods:
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Mechanical pump
For the ones that are filled with mechanical pumps, a cover is required to resist that pressure.
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Gravity
They are filled according to the action of gravity. Thus, are covered accordingly.
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Pneumatic fill
These are put under a lot of pressure because the chemical is blown into the tank hence a cover is required that could resist this pressure.
3) The type of access required
Types of access required are the main factor that helps us decide what type of access is required for the cover of your manway.
