kannot Posted December 15, 2016 Share Posted December 15, 2016 sometime back I was asking about irrigation and pump size. The local village water ( Close to Hua Hin) is often off for the hot season, or on for just an hour or so, so I will use my 1 rai lake (8metres deep) to irrigate my trees, Ive done all the calculations and will need a 1-1.5 electric pump, this is supplied by 4mm2 ,3 core cable straight off a 20a breaker etc Question I need to know is, is it possible to buy one of these pumps circa 5-7000 baht and make it automatically turn itself off and on, nothing fancy, ie open a tap and it kicks on? whats required? or does that mean pressure tanks etc..last time we discussed the Hitachi 750 inverter model but at 22+k for maybe 2-3 months watering a year seems a bit ott and the lake water isnt excatly 100% clean which I fear may break this model? Although i see the electric pumps say on the top " constant use"? meaning I assume they must be run continually not off on as a tap is opened which would mean my staff opening say 3x10 sprinklers and making sure they are left open until finished then turned off at the pump first then closing the taps ...which I guess if i can train him to do that would suffice..............though he aint exactly bright and has a nasty habit of thinking he can do things another way, usually with a catastrophic result. 30 sprinklers = 49.8 lit minute 10.95 gallons minute...........all my pipes are buried and 1 inch which in reality is 28mm internal bore Link to comment Share on other sites More sharing options...
Strange Posted December 15, 2016 Share Posted December 15, 2016 Ok, 7 minutes ago, kannot said: need a 1-1.5 electric pump This is HP? 7 minutes ago, kannot said: Hitachi 750 inverter This pump is something that you were looking at as a viable option? Or would the pump be a type of centrifugal pump with the pick-up in the lake? Something like this, as it would handle junk from your lake way better than the Hitachi unit and way cheaper. I have quite a few easy solutions but just need to understand the pump. Link to comment Share on other sites More sharing options...
kannot Posted December 15, 2016 Author Share Posted December 15, 2016 (edited) 7 minutes ago, Strange said: Ok, This is HP? This pump is something that you were looking at as a viable option? Or would the pump be a type of centrifugal pump with the pick-up in the lake? Something like this, as it would handle junk from your lake way better than the Hitachi unit and way cheaper. I have quite a few easy solutions but just need to understand the pump. Thanks, yep this type of pump (your photo pick up from lake) 1-1.5hp-2hp need to achieve 40psi at sprinkler head can vary the amount open at any one time they are in multiples of 8-10, so i could open just 10 or 20 or 30 etc etc (150 trees to irrigate spray head sprinklers not rotating) runs down 28mm diameter pipe over about 100-150metres level ground with a 6 metre total head which will vary slightly up to 7 metres as pond level drops all pvc 13.5 flow rate of 30 sprinklers is 11 gallons a minute 20 is 7.3 gallons minute etc Edited December 15, 2016 by kannot Link to comment Share on other sites More sharing options...
Strange Posted December 15, 2016 Share Posted December 15, 2016 We call those "Junk pumps" at home. Good for dirty stuff. Easiest way? Get a pump larger than you think you need and buy a bypass regulator. Run the discharge back to the lake. Set the bypass regulator at 40 psi, and let the regulator vent the overpressure above 40 psi. Can open 10, 20, 30 sprinklers and it won't have a negative effect, it will just vent less back to the lake. You can keep the valves open, and just use the breaker switch to turn the pump on and off. Make sure there is a foot valve (check valve) on the pick up in the lake. Since you have a lake it makes it so much easier. Bypass regulator is perfect. How does that sound? Need more functionality? Link to comment Share on other sites More sharing options...
CGW Posted December 15, 2016 Share Posted December 15, 2016 (edited) Centrifugal pump, (a pump that uses an impeller to move water) is the correct name. I used to use one on the house, pump into a pressure vessel with a pressure switch installed. Edited December 15, 2016 by CGW Link to comment Share on other sites More sharing options...
Strange Posted December 15, 2016 Share Posted December 15, 2016 Just now, CGW said: Centrifugal pump, (a pump that uses an impeller to move water) is the correct name. 28 minutes ago, Strange said: Or would the pump be a type of centrifugal pump with the pick-up in the lake? Link to comment Share on other sites More sharing options...
CGW Posted December 15, 2016 Share Posted December 15, 2016 ^Yes, my brain is not functioning - sorry........... Link to comment Share on other sites More sharing options...
Strange Posted December 15, 2016 Share Posted December 15, 2016 Just now, CGW said: ^Yes, my brain is not functioning - sorry........... Link to comment Share on other sites More sharing options...
kannot Posted December 15, 2016 Author Share Posted December 15, 2016 7 minutes ago, Strange said: We call those "Junk pumps" at home. Good for dirty stuff. Easiest way? Get a pump larger than you think you need and buy a bypass regulator. Run the discharge back to the lake. Set the bypass regulator at 40 psi, and let the regulator vent the overpressure above 40 psi. Can open 10, 20, 30 sprinklers and it won't have a negative effect, it will just vent less back to the lake. You can keep the valves open, and just use the breaker switch to turn the pump on and off. Make sure there is a foot valve (check valve) on the pick up in the lake. Since you have a lake it makes it so much easier. Bypass regulator is perfect. How does that sound? Need more functionality? nope thats fine thanks now have you a photo of a bypass regulator and where in the set up does it go ie ill have a pipe into the lake which is the uptake, that goes into the pump, then the pump out put to the pipework, pipe diagram would be good as im a bit new to irrigation? Thanks for your input btw excuse crude drawing the pump will be housed in a block structure with roof already built speciall next to the lake ie within 3 feet from the water Link to comment Share on other sites More sharing options...
kannot Posted December 15, 2016 Author Share Posted December 15, 2016 Guessing like this ? Link to comment Share on other sites More sharing options...
Strange Posted December 15, 2016 Share Posted December 15, 2016 Just now, kannot said: Guessing like this ? Yep, thats right. Real quick, do you have any idea approximately what size the intake and outflow of the pump will be? I will try and find you an appropriate diagram & link. You are also going to need a pressure switch to protect everything from accidental fault from the regulator. Its nothing really, just a safeguard incase there is overpressure more than what you want or way over and breaks pipe & sprinklers. Ill get you an image for that too. Link to comment Share on other sites More sharing options...
Strange Posted December 15, 2016 Share Posted December 15, 2016 (edited) Pressure relief valve. This does NOT go inline between the pump and your sprinklers. It would go on a "T" piece and vent overpressure. This is just an example of a simple one I found, the are a lot of different styles, sizes, standards, etc... This one is the simplest. They make one with a pressure relief switch and built in gauge so you can relieve pressure at the pump for service. There is only 1 in and 1 out, goes off to the side, NOT pump in water out. And gotta get one same size as ur pump. This one is 3/4" Edited December 15, 2016 by Strange screen dominating photo size Link to comment Share on other sites More sharing options...
Strange Posted December 15, 2016 Share Posted December 15, 2016 Pressure switch commonly found at any local isaan/thailand construction supply place. This one is adjustable. Cut in and Cut out. Only really need "Cut out" but you can adjust it so its set at like 30 psi on (on all the time basically in this setup) and 50 psi off (overpressure). They generally only adjust in 20 PSI increments. But they are sold everywhere and will work and cost nothing. Taps in right after the pump inline with the sprinklers. Link to comment Share on other sites More sharing options...
Strange Posted December 15, 2016 Share Posted December 15, 2016 Then just a few PSI/Bar gauges and that check valve at the foot of the pick up and should be ok. Link to comment Share on other sites More sharing options...
Strange Posted December 15, 2016 Share Posted December 15, 2016 1 hour ago, CGW said: I used to use one on the house, pump into a pressure vessel with a pressure switch installed. Yep that is the system I was gonna recommend next but its a bit more expensive and complicated. Link to comment Share on other sites More sharing options...
Strange Posted December 15, 2016 Share Posted December 15, 2016 Something like this: Link to comment Share on other sites More sharing options...
Hereinthailand Posted December 15, 2016 Share Posted December 15, 2016 Make it simple and put a timer on the pump, set it for two times a day early morning and evening for better tree growth. I think your pressure switch on this system will be more trouble than its worth. Link to comment Share on other sites More sharing options...
kannot Posted December 15, 2016 Author Share Posted December 15, 2016 1 hour ago, Strange said: Something like this: ah I know this system, heres one I did earlier this year for potable water but had 5 foot high pressure vessel, Ill check the pump info next time Im down global house, I already have pressure switches and get back to you Link to comment Share on other sites More sharing options...
kannot Posted December 15, 2016 Author Share Posted December 15, 2016 8 minutes ago, Hereinthailand said: Make it simple and put a timer on the pump, set it for two times a day early morning and evening for better tree growth. I think your pressure switch on this system will be more trouble than its worth. no need for a timer, i have staff who will do it and i may leave the pressure switch out as it wont run for more than about 1 hour per day with the staff always checking the sprinklers etc any problems and it should just drain straight back to the pond but would be spotted quickly, trying to keep this simple and cheap as only used 2-3 months per year Link to comment Share on other sites More sharing options...
Hereinthailand Posted December 15, 2016 Share Posted December 15, 2016 Iin your first post you worried about staff not doing their job, a timer doesnt have that problem, up to you. Link to comment Share on other sites More sharing options...
Strange Posted December 15, 2016 Share Posted December 15, 2016 37 minutes ago, kannot said: ah I know this system, heres one I did earlier this year for potable water but had 5 foot high pressure vessel, Ill check the pump info next time Im down global house, I already have pressure switches and get back to you Yep good system there. Looks like submersible pump, pressure switch, pressure tank, then point of use? 40 psi on and 60 psi off on the switch? If thats a submersible pump in there thats a pro setup. Its what we do in the states for homes on wells. No need storage tank or auxiliary pressure pump. Pressure tank takes care of that. Link to comment Share on other sites More sharing options...
Strange Posted December 15, 2016 Share Posted December 15, 2016 38 minutes ago, kannot said: no need for a timer, i have staff who will do it and i may leave the pressure switch out as it wont run for more than about 1 hour per day with the staff always checking the sprinklers etc any problems and it should just drain straight back to the pond but would be spotted quickly, trying to keep this simple and cheap as only used 2-3 months per year Id put it in. Costs nothing, wiring is already there. If the bypass fails or gets clogged you need something to switch the pump off. Cant trust the staff to watch this kinda thing all the time. Its like 2 minutes extra work. Since you know about switches you can find a simple 80 psi cutoff unit just to protect the system. Regular pressure switch will work just fine too. You having a lake right there for a simple return is the cheapest/easiest way to maintain your desired pressure. If no lake then you'd need another pressure tank setup. Link to comment Share on other sites More sharing options...
kannot Posted December 15, 2016 Author Share Posted December 15, 2016 (edited) 1 hour ago, Hereinthailand said: Iin your first post you worried about staff not doing their job, a timer doesnt have that problem, up to you. Yeah I meant in turning the taps off "before" turning off the pump letting the pressure build up until "boom" Theyll remember to turn it on and off alright thats wont be a problem just the order to do it in thats why the pressure relief valve was necessary, othe r possible problem is power cuts although we dont get too many seem to come in spits n spurts, nothing for months then 3-4 in a week Edited December 15, 2016 by kannot Link to comment Share on other sites More sharing options...
kannot Posted December 15, 2016 Author Share Posted December 15, 2016 34 minutes ago, Strange said: Yep good system there. Looks like submersible pump, pressure switch, pressure tank, then point of use? 40 psi on and 60 psi off on the switch? If thats a submersible pump in there thats a pro setup. Its what we do in the states for homes on wells. No need storage tank or auxiliary pressure pump. Pressure tank takes care of that. Yeah I did two of these myself, couldnt trust anyone roud here to do it, The tank was pricey Grundfos the "manifold" I got in America stainless steel brought over by a friend stupidly made in China but couldnt find a decent one here, wells 50 metres deep 6000 lits an hour, I have it at 32psi on 52 off ,tank pressure 30psi, its a 300 litre tank, actually holds about 90 litres of water before refilling also a 5 bar pressure relief valve Link to comment Share on other sites More sharing options...
Strange Posted December 15, 2016 Share Posted December 15, 2016 23 minutes ago, kannot said: Yeah I did two of these myself, couldnt trust anyone roud here to do it, The tank was pricey Grundfos the "manifold" I got in America stainless steel brought over by a friend stupidly made in China but couldnt find a decent one here, wells 50 metres deep 6000 lits an hour, I have it at 32psi on 52 off ,tank pressure 30psi, its a 300 litre tank, actually holds about 90 litres of water before refilling also a 5 bar pressure relief valve Since you clearly know ur stuff and you get what I'm saying with the pressure relief valve, they make tons of better ones that flow better & regulate pressure better. That pic I showed was basically a safety bypass similar to the one on your submersible & was minimum 50 psi. Not really meant to be 'bypassing' all the time but its mechanical and will still work just fine as a cheapie setup. But it makes the pressure switch even more important especially if your staff fiddle with valves & stuff. They make way better ones. Tons on aliexpress and eBay. Link to comment Share on other sites More sharing options...
kannot Posted December 15, 2016 Author Share Posted December 15, 2016 4 minutes ago, Strange said: Since you clearly know ur stuff and you get what I'm saying with the pressure relief valve, they make tons of better ones that flow better & regulate pressure better. That pic I showed was basically a safety bypass similar to the one on your submersible & was minimum 50 psi. Not really meant to be 'bypassing' all the time but its mechanical and will still work just fine as a cheapie setup. But it makes the pressure switch even more important especially if your staff fiddle with valves & stuff. They make way better ones. Tons on aliexpress and eBay. Thats ok I have two ones I got as spare from Grundfos (Telemechanique is the name) as seen in the picture they are well made and fully adjustable, this is my second well, excellent drinkable water ( tested in BKK) but low yield about 500 -1000 lit an hour, i can swap between the two wells to supply the two houses in fact both are connected but split between two places, if one fails I can simply open two valves and revert to the other , basically the same as the first but with 200 litre tank, same pressure switch about 1200 baht I think they were. In the background far left is where the other supply comes in, it runs down 100 metres of hdpe 1.5 inch from the other well Link to comment Share on other sites More sharing options...
kannot Posted December 15, 2016 Author Share Posted December 15, 2016 (edited) 5 hours ago, Strange said: Yep, thats right. Real quick, do you have any idea approximately what size the intake and outflow of the pump will be? I will try and find you an appropriate diagram & link. You are also going to need a pressure switch to protect everything from accidental fault from the regulator. Its nothing really, just a safeguard incase there is overpressure more than what you want or way over and breaks pipe & sprinklers. Ill get you an image for that too. The one Ive been looking at "Lucky Pro" 1.5hp intake is about 1.5-2 inch OUTFLOW is definitely 1 inch as I screwed a 1 inch fitting into the end of it yesterday and this will match all my pipework to the sprinklers Might be this one I think but many different models http://www.lucky-pro.com/products/Centrifugal_Pump/MCP25160A.asp Edited December 15, 2016 by kannot Link to comment Share on other sites More sharing options...
Strange Posted December 15, 2016 Share Posted December 15, 2016 22 minutes ago, kannot said: same pressure switch about 1200 baht I think they were. Here is a cheapie I had in my desk. Same thing used on those "Lucky Star" "Constant Pressure" pumps with the little pressure tank underneath. Sold everywhere this one was like 150 baht. Adjustment screw on top. Good for a cheapie setup & can buy a replacement at the corner hardware store without having to go into town and make a day out of it. Link to comment Share on other sites More sharing options...
kannot Posted December 15, 2016 Author Share Posted December 15, 2016 3 minutes ago, Strange said: Here is a cheapie I had in my desk. Same thing used on those "Lucky Star" "Constant Pressure" pumps with the little pressure tank underneath. Sold everywhere this one was like 150 baht. Adjustment screw on top. Good for a cheapie setup & can buy a replacement at the corner hardware store without having to go into town and make a day out of it. Yeah , Ive got plenty of spares here, I usually buy at least one spare of most things as stuff I use is often not available easily or the quality is so poor I just decide not to use it. Heres 2 different type i have here the right one is a cheap Polish product the left is the telemechanique Link to comment Share on other sites More sharing options...
Strange Posted December 15, 2016 Share Posted December 15, 2016 2 minutes ago, kannot said: Yeah , Ive got plenty of spares here, I usually buy at least one spare of most things as stuff I use is often not available easily or the quality is so poor I just decide not to use it. Heres 2 different type i have here the right one is a cheap Polish product the left is the telemechanique One on the right is the kind I'm used to at home. The cheap polish one. The one in my pic is the REAL cheap one lol Link to comment Share on other sites More sharing options...
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