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Pescador
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Registered: 10-17-2002
Location: Baja California Sur
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Water pressure pumps
Ok, water pressure is 2.3 lbs per foot of elevation., so to get 45 obs of pressure you need 19 1/2 feet of height. Consequently most systems I see
with buried tinacos or ground level use some type of pressure pump system. If you have one did you buy a mexican system and install or did you bring
one from the states. Approximate costs?
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David K
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Pescador, the gain (or loss) of water pressure is 0.443 pounds per foot of change. If you want 45 PSI, the top of the water in the tank will need to
be just over 100 feet HIGHER than the point of use.
20 feet would give you just under 9 PSI.
This information is on page 42 of the book I co-authored in 1992 called 'Irrigation Design'.
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comitan
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In La Paz you can buy, US, Mexican systems all sizes all prices. and yes every system I know has a pressure tank.
Strive For The Ideal, But Deal With What\'s Real.
Every day is a new day, better than the day before.(from some song)
Lord, Keep your arm around my shoulder and your hand over my mouth.
“The sincere pursuit of truth requires you to entertain the possibility that everything you believe to be true may in fact be false”
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David K
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Only 20 photos Larry? Heck, I dodn't know if I can tell a story with less than that!
Drip irrigation needs less pressure than typical sprinklers. The emitterline (dripperline) from Netafim works between 5 and 50 PSI... has an emitter
factory installed every foot in the tube. So if your lines aren't too long you may get by with 10 PSI... to start the system. The length, elevation
change, and emitter flow per foot will determine if your pressure is enough... or Your starting pressure will determine how long the drip system can
run per valve.
The bigger trick is if you want to have an automatic system (battery operated or AC) as you will need valves that operate at very low pressure... So
do the research to find the operating pressure range for the valve and for the irrigation devices.
With the water pressure known and a landscape plan, somehow it can be made to work... lot's of variables and choices in irrigation! I love it!
[Edited on 4-6-2007 by David K]
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Mexitron
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I'll second the Netafim drip tubing suggestion for low pressure irrigation--good stuff!
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Alan
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Registered: 4-6-2005
Location: Yucaipa, CA/La Paz
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| Quote: | Originally posted by Pescador
Ok, water pressure is 2.3 lbs per foot of elevation., |
| Quote: | Originally posted by David K
Pescador, the gain (or loss) of water pressure is 0.443 pounds per foot of change. |
Pescador, your numbers are right. your units of measurements are just reversed.
A column of water 1' tall exerts a pressure at its base of .434 psi. A column of water 2.3' high exerts a pressure of 1 psi.
Unless you have a very tall hill nearby and are willing to run the necessary pipe, get a pressure pump.
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longlegsinlapaz
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Pescador
How these guys hijacked your thread & turned it into an irrigation question is beyond me!!
Virtually all gringos that I know who have built do use a water pressure holding tank. I've built twice & had them in both casas...I also add an
auto shut-off float to the cistern that's tied directly into the electrical circuit of the pressure tank, so when the water level is at a
pre-determined point, it'll shut off the pressure tank pump rather than burn it out. You'd have to check with hardware stores in your area to see
what makes, models, capacities & pricing is available near you.
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Russ
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Pescador, I've used both AC & DC pumps here. I bought an AC pump with pressure tank from Guero and it has worked for two years without problems.
The 12volt pumps (Sureflow Blaster types) don't last as long for general use and seem to be a little noisier. The AC one with a half horse pump uses
about 8 amps so it really isn't too bad. I kept the factory settings for the pressure regulator and I'm happy with that. You'll want to but fixtures
that have a removable water saver devices.
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Marie-Rose
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We just installed an new water pressure tank... 82 gallons (310 litres) "Flotec" and bought it in TS for $250.
Remember, when in Mexico, yes may be no and no may be
maybe!
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Bob and Susan
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you get 2 flushes before the motor starts
we have about 80 feet of 3/4 inch pipe to keep pressureized
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losfrailes
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Location: Ejido San Lucas near Santa Rosalia
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Pescador,
10 years ago I installed an underground 2500 liter tank that fills till a float valve stops the flow.
I then put a small 5 gallon pressure tank, the type with a bladder inside, connected with a 1/2 HP pressure regulated 120 volt motor. The draw comes
up from about 9 feet and maintains a solid 55 psi.
Have only had one small problem with it, the starting solenoid on the motor gave up the ghost. Easily replaced and still running strong.
All parts were purchased in the local hardware store in Santa Rosalia.
Hey, thats a picture of the identical item from Bob and Susan, however I think their tank is a 10 gallon one.
[Edited on 4-6-2007 by losfrailes]
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Bob and Susan
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here is the data...
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Sharksbaja
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Yes, ours was the same only with a 45 gal tank. It now has a home somewhere in the SOC.
Now, however, water pressure is a constant 20-25 psi from the city so Iam not sure if well install a new one. Probably will, I plumbed the new system
for one.
Bob, what is the drawdown in gals with the switch set for 20psi/40psi?
Is that a water meter sitting on the ground?????
DON\'T SQUINT! Give yer eyes a break!
Try holding down [control] key and toggle the [+ and -] keys
Viva Mulege!
Nomads\' Sunsets
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bigboy
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I use the Sears Hydro Glass shallow water jet pump at my house in Baja. I have about a 30 gal pressure tank like Bob and Susan's set up. The pump
starts up at 40 psi and shuts off at 60 psi.
A lot of my neighbors have the same pump and are pleased with the performance of the system. The pump retails for less than $300 at Sears.
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Pescador
Ultra Nomad
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Location: Baja California Sur
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By golly you are right, it was early morning and I did reverse the numbers, and to think "I are a certified water operator".
Guess the question is what size pressure tank is appropriate for the amount of usage. Wayne is using a smaller tank, Bob and Susan have a larger
tank but are expecting more water usage.
I think I might lean toward buying a system in Santa Rosalia so that I don't have more stuff to haul down.
Thanks for catching me in my error and for all the great info.
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Bob and Susan
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good eye corky...
that's a badger 1" water meter
we're tired of bending down and opening the tank to see the level
we'll just do the math...
ebay about $80
3/4" is about $40
i think the advertised drawdown is 19 gallons
but the thing turns on with 4 gallons used
but i have lots of lines to pressurize
every casita will have a pump like that...
you NEED water pressure for the shower or you can't get the soap off
your hair (if you still have it) will go flat!!!
the tank we are using now will hold the water for washing only ~2100 gallons
the casita tanks when installed will hold another ~2800 gallons
i also need the "power" when i wash the truck on sundays
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Bob and Susan
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it's not about the expansion of the lines but the total volume of the lines...
the more volume the bigger the pump need to be
the pump in my picture would easily pressurize and entire house
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Bob and Susan
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david k help me here...
you are the irrigation guy....
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losfrailes
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Location: Ejido San Lucas near Santa Rosalia
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This seems like 'much ado about nothing'.
The pressure tank and pump setup that Bob and Susan have is certainly adequate to supply the needs at their location.
This started simply, but seems to be getting technicalized (sp??) in a hurry.
It works, works fine. What more is needed?
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Bob and Susan
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i understand...
i'm not the expert here...
i wish i could explaine like the "bedman"
i'm just applying the principals that would happen in a sprinkler system.
the more pipe the less pressure...the harder it is to "pump it up"
maybe david k will assist
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