Wet and Dry Risers

Wet and Dry Risers a great choice for fire protection Macdonald Martin are the leading suppliers and installers of Wet and Dry Risers

Macdonald Martin are a great choice of Fire Protection Consultants for the supply and installation of Wet and Dry Risers. We can advise you if your environment would benefit from the installation of a wet or dry riser system. From there we will help you from start finish with the installation making your place a bit more fire safe.

Wet Risers

To explain the choice to be made, firstly, a wet riser is a constantly pressurised water pipe supplied by a storage tank with pump, a mains pump or from a mains pressure supply.

By a wide margin, wet pipe Sprinkler Systems are installed more often than all other types of fire sprinkler systems. They also are the most reliable, because they are simple, with the only operating components being the automatic sprinklers and the automatic alarm check valve. An automatic water supply provides water under pressure to the system piping. All of the piping is filled with water. Until sufficient heat is applied, causing one or more sprinklers to fuse (open), the automatic sprinklers prevent the water from being discharged.

Operation – When an automatic sprinkler is exposed to sufficient heat, the heat sensitive element (glass bulb or fusible link) releases, allowing water to flow from that sprinkler. Sprinklers are manufactured to react to a specific range of temperatures. Only fire protection sprinklers subjected to a temperature at or above their specific temperature rating will operate.

The fire service then have an instant supply of water on site that is guaranteed to supply the fire suppression systems – when they need it.

Dry Risers

Dry Risers are vertical mains named so due to being normally emty of water. The opposite of a wet riser, it is used in instances where the immediate environment can be so cold as to freeze. This could apply to an unheated area or refridgerated space, for instance. The piping is pressurized with air, at a “maintenance” pressure which is relatively low compared with the water supply pressure. To prevent the larger water supply pressure from forcing water into the piping, the design of the dry pipe valve (a specialized type of check valve) intentionally includes a larger valve clapper area exposed to the maintenance air pressure, as compared to the water pressure. The connection point is on ground level to give the Fire service easy connection straight into a water supply.

Operation if connected to a sprinkler system – when one or more of the automatic sprinklers is exposed to sufficient heat, it opens, allowing the maintenance air to vent from that sprinkler. Each sprinkler operates individually. As the air pressure in the dry riser piping drops, the pressure differential across the dry pipe valve changes, allowing water to enter the piping system. Water flow from sprinklers needed to control the fire is delayed until the air is vented from the sprinklers. For this reason, dry riser systems are usually not as effective as wet riser systems in fire control during the initial stages of the fire.

Some view dry riser sprinklers as advantageous for fire protection of valuable collections and other water sensitive areas. This perceived benefit is due to a fear that a physically damaged wet pipe system will leak, while dry pipe systems will not. However, dry pipe systems will only provide a slight delay prior to water discharge while the air in the piping is released prior to the water filling the pipe.

The fire service are contacted to determine what their recommendations are. We get the right people involved, through our experience, to make your environment safer.

Want to know more about how our wet and dry risers can work for you? Send us a contact message or call us on the number at the bottom.

To explain the choice to be made, firstly, a wet riser is a constantly pressurised water pipe supplied by a storage tank with pump, a mains pump or from a mains pressure supply.

Give one of our specialist team a call for a no obligation free quote 0191 523 7870