Here at LJM we carry out maintenance and testing of Underground Fire Hydrants, but what is an Underground Fire Hydrant?

An Underground Fire Hydrant is a piece of apparatus which is installed in the City network water main.  They are marked by a yellow H plate usually mounted on a post near to the hydrant.  This apparatus is solely for the use of the Fire & Rescue Service, if the Fire Service attends a fire they need high volumes of water, their Fire Appliance can only hold a set amount of water, when that runs out they need to connect to the city main which will give them unlimited supplies of high volume water.

How does that affect you?

Many private sites such as private Business Parks, Schools & Universities, Hospitals, Car Parks and other large sites are usually required to install Underground Fire Hydrants at the build stage of the site because if there is a fire on the site a public hydrant may be too far away for the fire teams to access.  A private Fire Hydrant must be maintained to BS 9990:2015.  It is the responsibility of the land owner or managing agent to ensure the site has a current certificate of compliance

What is involved in hydrant testing?

Above Ground Inspection –  around the hydrant including the cover & frame and, the “H” plate signage is inspected to ensure it displays the correct information, and the area in general is inspected to ensure good access.

Below Ground – The depth and condition of the pit are inspected, if necessary the pit is cleared of debris.  The structure within the pit is examined to ensure it is in good order

Wet Test – this involves connecting our standpipe and slowly opening the hydrant to flush through the hydrant.  We then close the hydrant and fit the blank.  We slowly open the hydrant again and check the valve glands and joints for any leaks

Static test – This test involves connecting the static pressure assembly to the standpipe, slowly opening the hydrant and recording the static pressure

Flow test – this test involves connecting the digital flow meter to the standpipe and slowly opening the hydrant until it is fully open, a flow reading can then be recorded

On completion, the site will be issued with a certificate of compliance to BS 9990:2015

Why choose LJM?

Our engineers have over 20 years experience in hydrant testing and recording, our engineers are approved by National Water Hygiene and hold a current certificate (available upon request)

Prior to any testing all equipment is thoroughly cleaned using Water Authority approved solution so you can be sure there will be no risk of contamination