Lawrence Webster Forrest (LWF), Fire Engineering and Fire Risk Management Consultants
Lawrence Webster Forrest (LWF), Fire Engineering and Fire Risk Management Consultants



Navigation

Client login
Forgotten password
Follow us on Twitter Follow us on Facebook Subscribe to our blog

Lawrence Webster Forrest
Legion House
Lower Road
Kenley
Surrey
CR8 5NH

Tel: +44 (0)20 8668 8663 Fax: +44 (0)20 8668 8583
E-mail: fire@lwf.co.uk

Fire Engineering Design and Risk Assessment - Sprinkler Installation Design - Part 35

Posted by LWF: 01/03/2018 11:07

In this Fire Engineering blog series for Architects and others involved in building design, LWF has been discussing planning for the installation of sprinkler systems and the risks which must be ascertained and taken into consideration. Once the basic design requirement is in place, the next step is to address the supply of water to the system. In part 35, the main points of water supplies will be considered.

A sprinkler system is only as effective and reliable as the water supply it is connected to. Water must be available in sufficient quantities and for a suitable duration when required. The supply of water to a sprinkler system must be reliable, have a good flow rate and come from a source where there is sufficient capacity to feed the system for the time it is calculated to need.

In high hazard situations, the water supply must be suitably high in flow rate and capacity and, of course, must be reliable.

A water supply can be classified under one of three designations: single supply, superior supply and duplicate supply. A light or ordinary hazard installation is suitable for any of the water designations. A high hazard risk would only work in cases where the water supply was superior or duplicate.

A single water supply would usually consist of:

 a town main fed from a single source

 a single automatic suction pump drawing from a suitable source

 a single automatic booster pump drawing from a town main fed from a single source.

A superior supply might be:

 a town main which is fed from more than one source, and from both ends which is not dependent upon a common trunk main

 two automatic suction pumps which draw from a suitable source

 two automatic booster pumps which draw from a town main as outlined in the first point of this section

 an elevated private reservoir

 a gravity tank

 a pressure tank (suitable only for light and ordinary hazard risks)

A duplicate supply would involve the use of two of the above-listed supplies, but in the UK is most commonly a full holding capacity water storage tank and duplicate fire pumps.

It may be the case that duplicate pumps are required and in such situations, each pump must have the capacity to fulfil the requirements by itself. Where two pumps are needed, each pump must have independent electricity supplies so that if one supply fails, the other pump will continue to work. It is often found that one pump may be supplied by electricity and one by diesel, to avoid the necessity of two separate electricity supplies. In cases where one pump would not be sufficient if the other was out of action, three pumps must be used, each of which must be capable of providing half of the required capacity of water.

In part 36 of this series, LWF will continue to look at the water supply to sprinkler systems and how height differential affects matters. In the meantime, if you have any questions about this blog, or wish to discuss your own project with one of our fire engineers, please contact us.

Lawrence Webster Forrest has been working with their clients for over 25 years to produce innovative and exciting building projects. If you would like further information on how LWF and fire strategies could assist you, please contact Peter Gyere on 020 8668 8663.

While care has been taken to ensure that information contained in LWF's publications is true and correct at the time of publication, changes in circumstances after the time of publication may impact on the accuracy of this information.


Leave a reply

  *

  *

 


CAPTCHA Image

[ Change the image ]


*Required

Subscribe to our fire safety blogs

Bulletins
Email Format
* indicates required

FIRE SAFETY BLOGS

  • Fire Engineering Design and Risk Assessment - Foam System Discharge Devices continued - Part 7

    In LWF’s fire engineering blog series for architects and others in the building design industry, we have been discussing methods of fire suppression. In part 6, some of the types of foam system discharge devices were outlined and in part 7, that is continued before moving on to look at Foam system designs.A foam inlet system involves a breeching on the outside of a building being used by the Fire Service to pump foam...

    Read more...

  • Fire Safety for Healthcare Premises - Intensive Care Protection - Part 26

    In LWF’s blog series for healthcare professionals, we look to give information on best practice in fire safety for hospitals and other healthcare premises. In part 25, the use of external escape routes was raised and an outline given of how to give a safe and viable outside route to an external assembly point.  In part 26, LWF looks at the protection of those patients in Intensive Care wards in case of fire.The avoidance...

    Read more...

  • Facilities Management & Fire Safety - Inspection, Testing and Maintenance - Part 4

    In LWF’s blog series for people who work in Facilities Management or those with an interest in or responsibility for fire safety, we have been looking at the inspection, testing and maintenance regimen required in an organisation and how it should be carried out by the responsible person or relevant sub-contractor or in-house qualified personnel. In part 3, the checks that must be carried out on a daily, weekly, monthly and quarterly basis were outlined....

    Read more...

  • Fire Safety for Healthcare Premises - External Escape Routes - Part 25

    In LWF’s blog series for healthcare professionals, the aim is to give information on best practice of fire safety in hospitals and other healthcare premises. In part 24 of this series, the fire safety requirements for final exits was outlined and in part 25, we look at external escape routes.While the escape routes from any point inside a building to the outside are extremely important, it is also important to look at the route...

    Read more...

  • Fire Engineering Design and Risk Assessment - Foam System Discharge Devices - Part 6

    In LWF’s fire engineering blog series for Architects and others in the building design business, we have been looking at methods of fire suppression. In part 5, the different types of foam system were outlined and in part 6, we take a look at what is available in terms of foam system discharge devices.Foam ChambersUsed as a part of cone roof storage tanks, a foam chamber contains a vapour seal, the role of...

    Read more...

Case Studies

The Wohl Neuroscience Institute - Fire Safety, Strategy & Engineering
Key Facts: Client: King’s Clinical Neuroscience Institute Project Manager: MACE Ltd Designers: Devereux Architects/Allies and Morrison Approximate Size: 7,400m2 Description of the Project:...

Read more..

General Bulletins

Fire - The External Risk
When we consider fire safety, our focus is normally from within, what can we do to prevent the occurrence of fire and how we can limit its damage.  Whilst this is the correct stance to take, we m...

Read more..

Technical Bulletins

Evacuation Modelling - Factor in Human Behaviour
Evacuation of buildings can be analyzed in different ways. Approved Document B (ADB) which provides guidance on meeting the requirements of the England and Wales Building Regulations with regard to fi...

Read more..

Site map | Web development London