How manhole covers and gully grates are measured


How manhole covers and gully grates are measured How to measure Clear opening size Depth Examples of measurements Related pages How to measure Access cover dimensions are always referred to by their ‘clear opening size’ and sometimes also by their frame depth. The clear opening is the inside frame dimensions and these should normally be marked on the cover. If these are missing or have become illegible over time then it will be necessary to remove the cover and physically measure these dimensions. The clear opening size of the access cover frame must always be equal to or greater than the size of the chamber it is covering to ensure the frame is adequately supported. Clear opening size Measure the dimension of the opening inside the brickwork or chamber. This will be the same size as the opening inside the frame we supply. Do not measure the size over the top of the existing frame or the frame size. Depth Let us know any restrictions you have for the size and depth of your frame. CD 534 states all trunk road and motorway ironwork should be 150mm deep, and many highway Authorities apply the same guidance for local roads. Examples of measurements Related pages Knowledge base article Specifying Products under BS EN 124 The BS EN 124 standard serves as a general guide for determining the stability of products, and it outlines the parameters for different classes of products in terms of static load tests. However, it doesn't offer much specific information about the dynamic loads that various traffic conditions on modern road systems can impose. Article Out now: 2024 Access Solutions catalogue Download or request the delivery of our new access solutions catalogue, right to your door. Now including steel stock products, the catalogue allows merchants, contractors and specifiers alike to quickly access all the latest information you need, whether at your desk, on-site or serving a customer. Knowledge base article Why do seal plates / flood & odour control plates (F&OCPs) have WiS leakage classifications? Understand why seal plates / flood & odour control plates (F&OCPs) have WiS leakage classifications? Share this page

How to measure

Access cover dimensions are always referred to by their ‘clear opening size’ and sometimes also by their frame depth.

The clear opening is the inside frame dimensions and these should normally be marked on the cover. If these are missing or have become illegible over time then it will be necessary to remove the cover and physically measure these dimensions.

The clear opening size of the access cover frame must always be equal to or greater than the size of the chamber it is covering to ensure the frame is adequately supported.

Clear opening size

Measure the dimension of the opening inside the brickwork or chamber. This will be the same size as the opening inside the frame we supply. Do not measure the size over the top of the existing frame or the frame size.

Depth

Let us know any restrictions you have for the size and depth of your frame. CD 534 states all trunk road and motorway ironwork should be 150mm deep, and many highway Authorities apply the same guidance for local roads.

Examples of measurements

How to measure manhole covers and gully grates

Related pages

Knowledge base article

Specifying Products under BS EN 124

The BS EN 124 standard serves as a general guide for determining the stability of products, and it outlines the parameters for different classes of products in terms of static load tests. However, it doesn't offer much specific information about the dynamic loads that various traffic conditions on modern road systems can impose.

Article

Out now: 2024 Access Solutions catalogue

Download or request the delivery of our new access solutions catalogue, right to your door. Now including steel stock products, the catalogue allows merchants, contractors and specifiers alike to quickly access all the latest information you need, whether at your desk, on-site or serving a customer.

Knowledge base article

Why do seal plates / flood & odour control plates (F&OCPs) have WiS leakage classifications?

Understand why seal plates / flood & odour control plates (F&OCPs) have WiS leakage classifications?