Dry and Wet Risers are installed to ensure the availability of large quantities of water to the Emergency Services when attending to a fire in a building over 18 metres in height (buildings over 60 metres require wet risers).

Dry risers are comprised of vertical mains which are fitted into staircase enclosures or other suitable locations, with outlets installed at ground level to enable the fire services to connect into the water supply. Dry riser mains present a readily available means of delivering substantial quantities of water in order to extinguish or prevent the spread of fire. They are intended for use by the fire services or other trained personnel.

Dry Riser Installation

We provide an industry qualified design team who will put together a full design specification and give accurate installation costs. The information for the specification can either be gathered from scale drawings, or a free of charge full-site survey can be carried out by our engineers.

Using our own highly trained mechanical engineers, we provide the best possible service ensuring efficient installation, quality workmanship and competitive prices. All our site personnel are accredited to the Construction Skills Certification Scheme (CSCS) which includes training and instruction in basic and advanced site skills as well as encompassing Health and Safety awareness, as detailed within the CSCS Scheme Booklet. Engineers also hold licenses for IPAF (International Powered Access Federation) and PASMA (Prefabricated Access Suppliers’ and Manufacturers’ Association).

Following each installation, a full ‘wet test’ of the system is undertaken in accordance with BS 9990 guidelines and certification is awarded on successful completion of that test. All installation work comes with a full 12 month warranty guarantee so you can have complete confidence in your system.

The local fire services must be consulted to ascertain exact requirements before the installation of dry riser systems.

Dry Riser Servicing & Testing

Ensuring that the riser system for your building is in good working order is a legal requirement and there are severe penalties should your riser not work when it is needed.

Dry risers must be serviced every six months to ensure they comply with regulations. Servicing dry risers applies to all buildings above 18 metres and below 60 metres (buildings over 60 metres require wet risers). Every six months, dry risers should have a wet test and a visual inspection by a qualified engineer.

During the wet test, engineers fill each riser stack with water – this is the pipe that rises through the building with a landing valve on each floor/level. Some testing companies use street fire hydrants to carry out these tests. However, water from a fire hydrant should only be used by the fire services and is not available for testing companies. Our engineers carry all the necessary specialist equipment, including a water bowser, in order to service your dry riser system.

Before the test starts, the engineer checks that the landing valves are in good condition, that they have not been tampered with and that the valves are closed shut to prevent any water escaping. The air release valve at the top of the stack is also checked to make sure that it is operating correctly.

Before a certificate can be issued, the dry riser is pressurised to 10 bar and needs to hold water within the pipework stack for 15 minutes at this pressure. After the test, the water is discharged back into the water bowser and used again for other tests. If your premises have more than one dry riser, each stack should have the same test and receive an appropriate certificate in order to comply with the regulations.

All remedial works and maintenance to dry risers should be carried out by a competent, trained and accredited engineer. Should any remedial works be necessary, the engineer will advise what is needed to bring your system to the required standard. We also provide a 24/7 callout service should you have any urgent issues.


Fire hydrants are an integral part of our national fire safety infrastructure. They are utilised by the fire brigade to access water from the local mains supply.

Primarily located in public footways or highways they are typically installed, owned and maintained by water companies or local fire authorities. However, when fire hydrants are located on private or commercial property the maintenance responsibility lies with you.

Underground fire hydrants require regular inspection and maintenance in accordance with BS 9990. This ensures they will work in an emergency situation allowing the fire brigade to connect their hoses in the vicinity of the fire to access water more easily.

Fire Hydrant Testing

BS 9990 requires hydrants to undergo an annual test and inspection, as well as an inspection by a competent and qualified person every six months.

The maintenance and testing of private fire hydrants is the responsibility of the owners/occupiers on whose land they are installed – they will not be maintained by either the water company or the fire service. These hydrants are generally located on large sites such as hospitals, military establishments and industrial estates, but may also be installed to provide cover for specific at-risk properties.

The person responsible for the fire hydrant should make periodic inspections of all hydrants on a weekly or monthly basis. Of special concern are fire hydrants which are located on private water mains and are not the responsibility of the local water company or the fire and rescue service.

Marlowe Fire & Security offers a full and unique service from our expert engineers who are qualified to test and certify hydrants. Each hydrant has its water flow and pressure analysed using a calibrated meter. This ensures that the emergency services have the water supply necessary to effectively tackle a fire when attending the site of an emergency.

Should any hydrant fail its test then a full and comprehensive report is provided by our engineer. This allows remedial work to begin swiftly, restoring the hydrant to full and operational order and making your site safer in the process.

During the inspection and test, the condition of the following should be checked and noted for remedial action if necessary:

• Pits
• Frames
• Covers
• Surface paving around the edge of frames
• Depth of outlet below the frame (this should be no greater than 300mm)
• Method of indication by means of hydrant indicator plate.

Our engineers ensure that any production of water from hydrants will not be carried out when water is likely to freeze and cause a slip hazard. They also guarantee that correct signage is displayed and placed on the road to face oncoming traffic, ensuring the necessary warnings are given to other personnel in the area. All engineers wear high visibility clothing when inspecting or testing hydrants and treat safety as a high priority.

After each inspection or test, our engineers ensure that the hydrant pit is left empty and clean. This is then photographed for our customer’s records, giving peace of mind and and assurance of the quality of our work. Our engineers also make sure that the hydrant cover plate is refitted securely over the pit.

Dry Riser
Wet Riser
Fire Hydrants
Riser maintenance
Riser servicing
Hydrant maintenance
Hydrant servicing
Hydrant testing