Mastering Inline Relay Operations with a Four-Way Hydrant Valve
Mastering Inline Relay Operations with a Four-Way Hydrant Valve
“Our guys love the ability to hook in without having to interrupt the flow. Saved us in a number of ways.”
Overcoming Long-Distance Water Supply Challenges
Imagine rolling up to a working fire, only to realize your nearest water source is too far for a single supply line to reach. Your attack engine doesn’t have enough hose to cover the distance, and shutting down the flow mid-operation to add pumpers isn’t an option. So, what’s the fix?
An inline relay operation using a four-way hydrant valve is the key. This method allows firefighters to maintain uninterrupted water flow while adding pumpers to boost pressure as needed. In this article, we’ll break down how to execute an effective relay operation and keep water moving when it matters most.
What is an Inline Relay Operation?
An inline relay operation is a method used when the fire scene is too far from the water source for a single supply engine to handle on its own. Instead of relying on one long hose lay, additional pumpers are strategically placed in the supply line to boost water pressure along the route.
Why It Matters
Key Steps to Perform an Inline Relay Operation with a Four-Way Hydrant Valve
1. Establish the Initial Water Supply
The first-arriving supply engine stops at an intersection or key relay point.
The firefighter deploys the four-way hydrant valve at this location.
The supply line is connected from the water source to the valve.
2. Begin Forward Lay to the Fire Scene
The attack pumper proceeds toward the fire scene, laying hose as it goes.
The supply line from the hydrant feeds through the four-way valve toward the fire scene.
3. Pressurize the Supply Line
The supply engine establishes water from a hydrant or drafting source.
Water flows through the four-way valve directly to the fire scene.
Firefighters begin operations using the available pressure.
4. Tie in Additional Pumpers Without Interrupting Flow
If more pressure is needed, a second pumper connects to the four-way valve.
The additional pumper boosts pressure and sends enhanced flow downstream.
Water volume increases without shutting down the initial attack.
5. Expand the Relay as Needed
If distances are extreme, additional pumpers can be added in sequence.
The four-way valve ensures seamless transitions without interrupting water flow.
The key to long-distance relay operations is reducing friction loss. Use inline pumpers strategically and keep distances between them manageable.
Why This Technique is Essential for Firefighting Operations
Equipment You’ll Need
To execute an inline relay properly, you’ll need:
Download Your In-Line Relay Checklist Now!
– Step-by-Step Guide
– Required Equipment
– Notes Section
– Instructor Bio
What is the Oasis?
The Oasis Hydrant Assist Valve is a versatile 4-way valve designed to enhance firefighting operations by maximizing water supply, pressure, and flow rate.
Common Mistakes to Avoid
Mistake 1: Waiting Too Long to Add a Relay Pumper
Low intake pressure at the fire scene means you waited too long to add a pumper.
Mistake 2: Incorrect Hose Connections
Remember: Hydrant to hydrant port, attack to fire scene port. Mixing these up causes delays.
Mistake 3: Failing to Monitor Residual Pressure
Always check intake pressure at each relay pumper. If it drops too low, you need another boost.
Frequently Asked Questions (FAQs)
After-Action Review: Mastering In-Line Relay Operations
Here’s what to remember:
