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seeing this system helped us out a lot. I manage a 100+ year old building and we are needing to retrofit a sprinkler system in. My fire srpinkler contractor wanted to dig up the street upgrade the water service. Well that was quickly scrapped due to the congestion of lets say outher utilitys in the street from the near by refinerys. Also the building would not let us put the size of pipe the system needed. I emailed this video to him lastweek and we will be not copying it but using a guide to build our system. We have a old steam boiler that has been abanded. that space can now be used for the new pump and tanks can now live. Saves us some money hopefully. The one thing i am suprised not to see is some sort of low water supervisery sensor in those tanks. I would have thought you would want to monitor that incase one of them leeks or splits or have it kick off the pump to protect it.
Keep in mind that this system was designed to NFPA 13R (residential). I agree with you on the low water alarm. However, when designing a job, contractors go with the minimum required so they can be the lowest bidder. So if it isn’t required or specified, it’s not likely to happen.
Amazing video, I love it when you go around and explain everything slowly and show all the parts of a system / pump. I wonder, why is there a 3/32 hole in those checks?
The 3/32 holes help with the pressure surge from the pump turning on and off. It serve as dampening. Without them the pressure can bounce causing the pump to turn on and off rapidly (short cycle).
CRV drain piping on an electric pump is the same as heat exchanger drain piping on a diesel driven pump. Should be piped individually so you can assure both are flowing water when the pump starts. Only difference in that drain piping is depending on how far the heat exchanger piping travels to the drain in height and distance it might have to increase a pipe size or two. Other than that and the discharge control valve that’s not a bad set up.
It seems terrifying that there were so many mistakes made in the installation of this system. Obviously lots of money was spent on it, how did they not include all the things you mentioned? Will you now have to fit those for it to pass your testing?
It puts us in a bad situation as the inspector hired to do a NFPA25 inspection. The customer often gets upset that you are pointing these things out. They are under the impression everything is installed to code if it passed the install inspection by the AHJ. Unfortunately, this is too common. Technically it passes an NFPA25 inspection. These items are covered by NFPA 13 and 20 and are not inspection items covered by 25. None of the mentioned items would cause the system not to operate. If the pump needs to be down for repairs, I would recommend adding the discharge control valve at that time. The best thing to do as an inspector is to note that you saw some item outside the scope of NFPA25 that appeared to be incorrect. Then recommend a design/install review. For all I know the AHJ could have approved this install as it is. I hope that all makes sense. I should probably do a video on this problem sometime.
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Please like and subscribe to help the channel grow. Feel free to leave a comment. I would like your input so I can improve the channel. Thanks for watching!
seeing this system helped us out a lot. I manage a 100+ year old building and we are needing to retrofit a sprinkler system in. My fire srpinkler contractor wanted to dig up the street upgrade the water service. Well that was quickly scrapped due to the congestion of lets say outher utilitys in the street from the near by refinerys. Also the building would not let us put the size of pipe the system needed. I emailed this video to him lastweek and we will be not copying it but using a guide to build our system. We have a old steam boiler that has been abanded. that space can now be used for the new pump and tanks can now live. Saves us some money hopefully.
The one thing i am suprised not to see is some sort of low water supervisery sensor in those tanks. I would have thought you would want to monitor that incase one of them leeks or splits or have it kick off the pump to protect it.
Keep in mind that this system was designed to NFPA 13R (residential).
I agree with you on the low water alarm. However, when designing a job, contractors go with the minimum required so they can be the lowest bidder. So if it isn’t required or specified, it’s not likely to happen.
Amazing video, I love it when you go around and explain everything slowly and show all the parts of a system / pump. I wonder, why is there a 3/32 hole in those checks?
The 3/32 holes help with the pressure surge from the pump turning on and off. It serve as dampening. Without them the pressure can bounce causing the pump to turn on and off rapidly (short cycle).
Thanks great info!!
CRV drain piping on an electric pump is the same as heat exchanger drain piping on a diesel driven pump. Should be piped individually so you can assure both are flowing water when the pump starts. Only difference in that drain piping is depending on how far the heat exchanger piping travels to the drain in height and distance it might have to increase a pipe size or two. Other than that and the discharge control valve that’s not a bad set up.
It seems terrifying that there were so many mistakes made in the installation of this system.
Obviously lots of money was spent on it, how did they not include all the things you mentioned?
Will you now have to fit those for it to pass your testing?
It puts us in a bad situation as the inspector hired to do a NFPA25 inspection. The customer often gets upset that you are pointing these things out. They are under the impression everything is installed to code if it passed the install inspection by the AHJ. Unfortunately, this is too common. Technically it passes an NFPA25 inspection. These items are covered by NFPA 13 and 20 and are not inspection items covered by 25. None of the mentioned items would cause the system not to operate. If the pump needs to be down for repairs, I would recommend adding the discharge control valve at that time. The best thing to do as an inspector is to note that you saw some item outside the scope of NFPA25 that appeared to be incorrect. Then recommend a design/install review. For all I know the AHJ could have approved this install as it is. I hope that all makes sense. I should probably do a video on this problem sometime.