In a fire emergency, every second counts. Wet and dry risers act as vital lifelines in larger buildings, ensuring that firefighters have the immediate water access that they need in order to combat the flames effectively. 

We know that having the right fire protection services in place is key. This is why we’re delving into wet and dry risers - exploring their differences, advantages and applications. 

By understanding these systems, you can make informed decisions to ensure that your building is equipped with the most suitable fire protection solutions.

What is the difference between a wet and dry riser system?

Wet and dry risers are both vertical pipe systems designed to provide firefighters with that all-important water supply during a fire. However, they differ significantly in how they operate. 

A wet riser system is constantly filled with pressurised water, ready for immediate use by the fire service. This means firefighters arriving on the scene can connect their hoses to an outlet on any floor and instantly access water. 

A dry riser system, on the other hand, remains empty until it is needed. When a fire starts, firefighters connect their pumps to the inlet on the ground floor, pumping water up through the system to where it's needed. This fundamental difference in water availability plays a major role in determining which system is best suited for a particular building.

What is the purpose of a dry riser?

The main purpose of a dry riser is to provide a rapid and reliable water source to support firefighting operations in buildings where a constant water supply isn’t typically required - for example, in buildings where the risk of water damage from leaks or accidental activation is a concern.

For optimal usage, dry risers are strategically positioned throughout a building, typically in stairwells, with outlets on each floor. This allows firefighters to access water quickly and tackle fires on upper floors where traditional hoses might not reach.

What are the advantages of wet risers?

One of the key advantages of wet risers is the immediate availability of water. Having that instant access to water can quickly suppress fires and minimise damage, making it a significant benefit in fire emergencies. Wet risers are also relatively simple to operate and maintain, requiring less intervention from firefighters and streamlining their response. 

All in all, the constant presence of water ensures reliability, eliminating any delay in getting water to the fire. These benefits make wet risers a preferred choice for buildings where rapid fire suppression is needed.

When to use a wet riser?

Building regulations typically mandate wet risers in high-rise buildings, usually those over 50 metres tall. This is because the time it takes to pump water up a dry riser in a tall building could be critical in controlling a fire. 

Wet risers are also commonly used in buildings with complex layouts or high-risk occupancies, such as hospitals and hotels, where rapid fire response is essential.

What are the advantages of dry risers?

Dry risers also offer distinct advantages, such as reduced risk of water damage. Since the pipes are empty when they are not in use, there’s less risk of leaks or accidental activation that can cause water damage to assets and property. 

They’re also incredibly versatile, and able to be used in a wider range of buildings,including those where a constant water supply isn't necessary.

In some instances, dry risers can also be a more cost-effective option - especially in buildings where the risk of water damage is higher. It’s for this reason that dry risers are a suitable choice for many buildings, especially if water damage is a concern. 

When to use a dry riser?

Building regulations typically require dry risers in buildings over 18 metres tall where the top floor is more than 18 metres above ground level. This allows firefighters to have adequate water access on upper floors where their standard fire hoses will not reach. 

Dry risers are commonly used in residential apartment buildings, office blocks, and other mid-rise structures where a constant water supply isn't essential.

What is a dry riser outlet?

A dry riser outlet, also known as a landing valve, is the point where firefighters connect their hoses to access the water supply from the riser. These outlets are strategically located on each floor of a building, typically within protected stairwells or lobbies. 

Dry riser outlets must be easily accessible and free from obstruction, so that firefighters can connect their equipment quickly and efficiently.

How do wet and dry risers fit into a fire safety strategy?

Wet and dry risers are integral components of a building’s fire safety strategy. They work in conjunction with other fire protection measures, such as fire alarms, sprinklers, and fire extinguishers, to provide a multi-layered approach to fire safety.

When designing a fire safety strategy, you must consider the needs of your building and its occupants - considering factors such as building height, occupancy type, and fire risk.

The importance of fire risk assessments

Doing a proper fire risk assessment will play an important role in determining the appropriate fire protection measures for your building, including the type of riser system required. These assessments identify potential fire hazards and evaluate the risks to occupants, allowing you to implement appropriate safety measures.

Fire protection services from Magni Fire

At Magni Fire, we specialise in providing a complete range of fire protection services, including the design, installation, and maintenance of wet and dry riser systems. Our team of experts can assess your building's requirements and recommend the most suitable fire protection solution to ensure the safety of your property and its occupants.

Want to find out more about wet and dry riser systems for your building? Contact us today to discuss your wet and dry riser needs and learn more about how we can help you to keep your property and assets safe.