Boomless sprayers are a popular choice for spraying in areas where using a traditional boom sprayer is impractical, such as along fence lines, ditches, power lines, and other obstacles. While boomless sprayers offer convenience and flexibility, it’s important to understand how to properly maintain and operate them to prevent damage. One key aspect is managing the pressure in the sprayer tank and system. Failing to release pressure after each use can lead to serious problems like blown pressure gauges, damaged pumps, and ruptured tanks.
Why Pressure Builds Up
Several factors can cause pressure to build up excessively in a boomless sprayer:
- Clogged nozzles: If the spray nozzles become clogged and restrict flow, pressure will increase in the system as the pump continues to run.
- Improper pressure relief valve: A malfunctioning or improperly adjusted pressure relief valve may fail to open and relieve pressure when it exceeds the set point.
- Overfilling the tank: Filling the tank completely full reduces the air space at the top. As the fluid level rises from thermal expansion or foaming, it compresses this air space and increases pressure.
- Temperature changes: Leaving a sprayer out in the sun can cause the fluid inside to heat up and expand, increasing pressure. Conversely, very cold temperatures may freeze and rupture components if pressure isn’t released.
The Importance of Boomless sprayers are a popular choice for spraying in areas where using a traditional boom sprayer is impractical, such as along fence lines, ditches, power lines, and other obstacles. While boomless sprayers offer convenience and flexibility, it’s important to understand how to properly maintain and operate them to prevent damage. One key aspect is managing the pressure in the sprayer tank and system. Failing to release pressure after each use can lead to serious problems like blown pressure gauges, damaged pumps, and ruptured tanks.
Why Pressure Builds Up
Several factors can cause pressure to build up excessively in a boomless sprayer:
- Clogged nozzles: If the spray nozzles become clogged and restrict flow, pressure will increase in the system as the pump continues to run.
- Improper pressure relief valve: A malfunctioning or improperly adjusted pressure relief valve may fail to open and relieve pressure when it exceeds the set point.
- Overfilling the tank: Filling the tank completely full reduces the air space at the top. As the fluid level rises from thermal expansion or foaming, it compresses this air space and increases pressure.
- Temperature changes: Leaving a sprayer out in the sun can cause the fluid inside to heat up and expand, increasing pressure. Conversely, very cold temperatures may freeze and rupture components if pressure isn’t released.
The Importance of Releasing Pressure
Relieving the pressure in your boomless sprayer after each use is critical to avoid damage and extend the life of the components. Here’s why:
Prevent blown gauges: The pressure gauge is often the weakest point in the system. Excessive pressure can blow out the gauge, requiring replacement. Releasing pressure extends gauge life.
Protect pump seals: Leaving the pump and plumbing under pressure for extended periods can damage the pump seals and diaphragms, causing leaks. Relieving pressure reduces strain on the seals.
Avoid tank rupture: While poly tanks are durable, they can rupture if left under high pressure too long, especially if there are any weak points. Releasing pressure prevents this costly damage.
Reduce stress on hoses and fittings: Hoses and fittings are designed to handle a certain pressure range. Subjecting them to excessive pressure unnecessarily shortens their lifespan.
How to Release Pressure Properly
The proper way to release pressure from your boomless sprayer depends on how it is configured. Here are some common methods:
- Open the pressure relief valve: If equipped, open the pressure relief valve and allow it to vent until pressure drops to zero. Make sure the valve isn’t clogged and is functioning properly.
- Disconnect the supply line: Carefully disconnect the supply line from the pump outlet and allow the pressure to dissipate. Wear gloves and eye protection in case of spray.
- Open the tank lid: Slowly open the tank lid to vent pressure. Be careful as contents may spray out. Don’t remove the lid fully until pressure has dropped.
- Trigger the spray gun: If your sprayer has a handgun, you can trigger it to relieve pressure in the hose. However, this won’t release all pressure in the tank and pump.
Consult your sprayer’s instruction manual for the manufacturer’s recommended method to release pressure safely.
Preventing Pressure Problems
In addition to releasing pressure after each use, there are other steps you can take to prevent pressure issues with your boomless sprayer:
Install a quality pressure relief valve: A good pressure relief valve will automatically open and vent fluid when the pressure exceeds a set point, protecting the system from overpressure. Make sure the valve is sized correctly for your sprayer’s flow rate and pressure range.
Use an inline pressure regulator: A pressure regulator will maintain constant pressure to the nozzles, even if the flow rate changes. This helps prevent pressure spikes and keeps spraying consistent.
Maintain the proper air space in the tank: Avoid filling the tank more than 95% full to maintain an air gap at the top. This allows for fluid expansion and reduces the risk of over pressurizing the tank.
Keep nozzles and filters clean: Regularly check and clean the spray nozzles and inline filters to make sure they aren’t clogged. Nozzle orifices can be cleaned with a soft brush, compressed air, or by soaking in cleaning solution.
Winterize and store properly: Before storing your sprayer for the winter, drain all fluid and release pressure. Flush the system with RV antifreeze to prevent freezing. Store out of direct sunlight to avoid heat damage.
Troubleshooting Low Pressure Problems
While high pressure can damage a boomless sprayer, low pressure is a more common problem that can hinder performance. If you’re experiencing low pressure (below 20 psi), here are some things to check:
- Clogged intake filter: A clogged filter on the pump inlet will restrict flow and reduce pressure. Clean or replace the filter.
- Air leak on inlet side: An air leak anywhere between the tank and pump inlet will cause the pump to suck air and lose prime, reducing flow and pressure. Tighten connections or replace damaged lines.
- Worn pump: Diaphragm and roller pumps will wear over time, reducing their efficiency and pressure. Rebuild or replace the pump.
- Undersized plumbing: Using hoses and fittings that are too small in diameter for the flow rate will restrict flow and limit pressure. Make sure plumbing is sized correctly.
- Collapsed suction hose: A weak or kinked suction hose can collapse under vacuum and restrict flow to the pump. Use a reinforced suction hose sized for the pump inlet.
By understanding the causes of pressure problems and taking steps to prevent damage, you can keep your boomless sprayer running smoothly for years to come. Always release tank pressure after each use, install proper pressure control devices, and perform regular maintenance. Protecting your sprayer from pressure damage will save downtime and repair costs, letting you spray efficiently and effectively all season long.