I snapped a bunch of pictures but can't post them right
now as I have to run (maybe it will be a different thread
as this is getting a bit off topic from the "trucking"
It's interesting that the law requires tanks
Retired wrote, on Mon, 30 Jun 2014 11:19:38 -0400:
All residences out here in the mountains, AFAIK, are *required* to
have sprinkler systems.
In fact, here's a picture of the three 5,000 gallon tanks for one
relatively new residence I explored today.
The two tanks (10,000 gallons) to the right are for the sprinklers.
And only the overflow from them, is what feeds the left-most tank,
which is the 5,000 gallons for the residence.
Interestingly, the tank fill level was set too low:
Such that, when we lifted up the weights, water started gushing in:
Our informal plan is to check everyone's well setup, to ensure
at least they have the maximum water available.
We'll also test each of the wharf hydrants, in order to figure
out if they're working or not.
Stormin Mormon wrote, on Mon, 30 Jun 2014 11:03:25 -0400:
I don't think the law *requires* the cistern, but, the tank farm
I just visited had five 5,000 gallon tanks, plus what I call a
~20,000 gallon "cistern" and another 500 gallon water tank.
Water is pumped from the well into the bottom of the 1st tank:
That 1st tank is connected at the bottom of the 2nd tank:
It then overflows out the top of the 2nd tank to the 3rd tank:
It then flows out the top of the 3rd to the top of the 4th:
From that 4th tank, it flows to the 5th 5,000 gallon tank:
There was also a tiny 500 gallon tank which we will make
use of when delivering water by truck from the hydrant:
And, in our examination, we found the supply leaking out of
what I call the 20,000 gallon "cistern" (I don't know what
to call this mostly underground rectangular water reservoir):
The weights were hanging high and dry, but no water was there:
So, this house, at least, was minus 20,000 gallons of
potential fire-fighting water in this extreme fire hazard
DannyD. posted for all of us...
And I know how to SNIP
I was going to question that because it is much easier to fill from the top
because the pump does not have to fight the water weight. Also, would the
pump then have to overcome the weight of the water in the other tanks?
Is this a setup for one dwelling or several? Interesting, thanks for the
Around here they convert used gasoline fuel oil tankers to fill swimming
pools. Only problem is water weighs more and the cops stop them for
Tekkie® wrote, on Fri, 04 Jul 2014 16:51:43 -0400:
Yeah. Nobody noticed, so, I could have gotten away with the mistake, but,
I had to correct myself if for no other reason than my own netizen integrity.
It's a single residence with multiple buildings on it.
The water comes up from one well, into the top of the 5th 5K gallon tank,
which, IIRC, is the wharf hydrant tank, and then from that 5th tank, it
overflows into the 4th tank, which is the secondary building main water
From that 4th tank, it spills overhead into the 3rd tank, which is the
water supply for the main building, and then from that 3rd tank, it
spills over the top into the 2nd tank which is tied at the bottom to
the 1st tank, which has that 4 inch wharf hydrant pipe going into the
So, of the 5 x 5K gallons = 25,000 gallons, 15,000 gallons are reserved
for fire while only 10,000 gallons are for household water.
I'm glad you appreciate the effort, as, by posting this information, we
can all learn, and, by way of contrast, we can compare to how you guys
do it where you live, where, presumably, most of you have far more rain
than we get (we get rain only in the winter and then literally ZERO rain
from about March to about November) although we do get good fog which
waters the taller trees.
Interesting. 5 pounds per gallon versus 8 pounds per gallon is a pretty
big difference. I called recently to fill my swimming pool, and the cost
was $225 to $250 for every 3,800 gallons. The truck is a stainless steel
tanker, which, the company (Bay Area Water Trucking, 408-683-0500) says
is periodically inspected by the FDA (I was surprised at that) for
cleanliness. They get their water, like all the bulk water trucking firms,
out of the San Jose Water Company fire hydrants, which costs them
only about 1 cent a gallon.
Interestingly, with just a tank and a truck, we can get the same water
from the same fire hydrant for the same price; so all the cost is in
I noticed! If your tank is filled to 8 feet over the ground,
the pressure at the bottom is "about" 4 PSI. Makes no
difference if the tank is 100 gal, or 20,000 gal. Same PSI
to fight. Based on water height.
If your fill at the top is 16 feet up, you'll need "about"
You're not kidding.
A while ago, when I was filling my pool, I had called this company
to ask how much it would cost to have water delivered, and they
quoted $225 to $250 for every 3,800 gallons.
Bay Area Water Trucking, 408-683-0500
These guys were even more, IIRC (I think it was $4,000):
Franks Water Service 408-353-1343
So, to fill my pool, for example, would be at about $2,500
to $4,000 at local prices. For that kind of money, I could
buy a 500 gallon tank, and rent a Hertz truck, and make
80 trips. OK, after calculating the number of trips, I just
decided I'd need at least 1,000 gallons to drop it down to
40 trips. Even that's a lot of trips. Maybe I'll just use
the garden hose. ....
Stormin Mormon wrote, on Fri, 04 Jul 2014 17:17:28 -0400:
It was my mistake to show the flow backward.
The tanks all seem to fill from the top.
Then, they either overflow at the top, to the next tank:
Note: The flow is opposite the arrows drawn.
Or, they are connected at the bottom, in series:
Note: The flow is the opposite as drawn.
For example, my (rather puny) tanks are both connected at
the bottom, and there is no separate tank for fire only:
Mine seems to be the anomaly as every other tank I've seen
has been plastic, fatter, shorter, and they all had a separate
tank (or two) for fire only.
Unfortunately, one of mine is leaking at the bottom somehow:
Which I don't know really how to fix.
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