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We've blogged about this before, but it's worth repeating. Twin streaming is a technique in which you use a high pressure 3,000 psi F-valve to inject resin AND water at the same time. As you can see in the photo, the F-valve has two supply connections - one for water and one for resin. The water and resin come into contact before they exit the coupler.
Advantages:
- Ensures there is enough water for the resin to react with.
- Starts the reaction immediately.
- Promotes faster reaction in cold water.
Filling Voids Above the Water Table
When working on jobs that require void filling behind walls, also known as curtain grouting, it is imperative that you are prepared for any obstacles that may occur. If the voids are large and dry, resin may not have enough water to react with when injected in the conventional manner. In this case injecting water behind the wall prior to injection might not be sufficient (especially if the void is open or filled with gravel, giving the water an easy path to escape). With twin streaming you are guaranteed there is enough water for the resin to fully react and fill the voids.
Injecting Resin Into Cold Water
Twin streaming also works well if you find yourself having to inject into a cold, underwater environment. You can inject warm water along with the resin to jump start the reaction process before the cold water gets a chance to slow down the process. The ratio of water to resin can be controlled by opening the valves at different angles. Some products such as Spetec PUR H100, Spetec PUR H200 and AP Fill 700 only need a little water to react with (10:1 resin to water is plenty). In this case, you would crack the water valve slightly, then open the resin valve all the way. Other products such as Spetec PUR GT500 and Spetec PUR GT350 need more water. A 2:1 or 1:1 ratio of resin to water both work well. In this case, you may want to open both valves all the way.
Want more info on Leak Seal products?
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In a structure that holds water, you need something flexible to inject into cracks or joints. These types of structures are usually above ground and exposed to changing temperatures. As concrete heats up during the day it expands; joints and cracks squeeze together. As it cools, the concrete shrinks and joints and cracks open up. Thus, you need an injection foam that has flexibility to handle the movement. You also need to do the injection work in the early hours of the day. Some contractors have injected cracks in the afternoon; stopping leaks, only to find them leaking again in the morning. .png?width=1400&name=Leak%20Seal%20Solutions%20for%20Municipalities%20(1).png)
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Alchemy-Spetec's Jim Spiegel will be presenting at the ICRI National Convention at the Omni Jacksonville Hotel on Tuesday, April 9th, 2019 from 8:30-9:15am. The topic of the technical session will be,
See live product mixing demos!
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