Thank you for this video now how can applying application rate which is about 0.1 GPM/ft^2 for 15 minutes if my eductor is 100GPM and matching with the nozzle for 1.5 inches hose I don't know if the 100 psi is convenient or no? and what about no. of hose connections?cheers
Good evening Khalid. Thank you for the reply. Here's what I can tell you, hose diameter doesn't necessarily make as much of a difference as GPM and the Eductor psi rating other than increasing your back pressure threshold which ultimately reflects on how many connections will be allowed to make maintaining a good quality of foam. In the video we are using an Akron eductor with a 200psi rated inlet at 95gpm with a Task Force Tip (TFT) automatic nozzle that has a GPM range of 50 to 200gpm. The important thing with the video example that was successful for us is making sure the GPM's matched the Eductor and that the back pressure did not exceed 70% of the rated inlet pressure on the eductor. In this case our calculated back pressure was 112psi (nozzle pressure 100psi + friction loss in 100' of 1.75" hose was 12psi). This is under our threshold of 140psi. So our quality was there. We attached a TFT foam jet that gave us a foam expansion ratio of about 8:1 which in turn enhanced the foam quality substantially. For your example with 1.5" hose, there will be an estimated back pressure of 124psi which is under the 70% with 100' of hose. With this diameter it can be extended to 150" from the eductor and be able to stay under 70%. Assuming the reference is to a nozzle pressure of 100psi and using a in-line eductor rated for 200psi at 95gpm (100gpm) good quality foam can be produced. I guess you would have to decide if 1.5" hose is convenient or not. If the reference is to 100psi pump discharge pressure at the application rate of .1 GPM/sqft, (3% hydrocarbon I'm assuming) I'm thinking that pressure is probably a little too low and the foam production and quality may suffer. 1.5" diameter increases the friction loss per 100' by about 50% compared to 1.75" but at the right calculation good quality foam can be produced. I hope this helps and I answered your question. Sorry for the delayed response, have a good night.
Thank you for this video now how can applying application rate which is about 0.1 GPM/ft^2 for 15 minutes if my eductor is 100GPM and matching with the nozzle for 1.5 inches hose I don't know if the 100 psi is convenient or no? and what about no. of hose connections?cheers
Good evening Khalid. Thank you for the reply. Here's what I can tell you, hose diameter doesn't necessarily make as much of a difference as GPM and the Eductor psi rating other than increasing your back pressure threshold which ultimately reflects on how many connections will be allowed to make maintaining a good quality of foam. In the video we are using an Akron eductor with a 200psi rated inlet at 95gpm with a Task Force Tip (TFT) automatic nozzle that has a GPM range of 50 to 200gpm. The important thing with the video example that was successful for us is making sure the GPM's matched the Eductor and that the back pressure did not exceed 70% of the rated inlet pressure on the eductor. In this case our calculated back pressure was 112psi (nozzle pressure 100psi + friction loss in 100' of 1.75" hose was 12psi). This is under our threshold of 140psi. So our quality was there. We attached a TFT foam jet that gave us a foam expansion ratio of about 8:1 which in turn enhanced the foam quality substantially. For your example with 1.5" hose, there will be an estimated back pressure of 124psi which is under the 70% with 100' of hose. With this diameter it can be extended to 150" from the eductor and be able to stay under 70%. Assuming the reference is to a nozzle pressure of 100psi and using a in-line eductor rated for 200psi at 95gpm (100gpm) good quality foam can be produced. I guess you would have to decide if 1.5" hose is convenient or not. If the reference is to 100psi pump discharge pressure at the application rate of .1 GPM/sqft, (3% hydrocarbon I'm assuming) I'm thinking that pressure is probably a little too low and the foam production and quality may suffer. 1.5" diameter increases the friction loss per 100' by about 50% compared to 1.75" but at the right calculation good quality foam can be produced. I hope this helps and I answered your question. Sorry for the delayed response, have a good night.