Water Tank Pressure Gauges, Location, Installation, Use, Repair
How to use a water pressure gauge to measure or monitor building water pressure or to adjust water pressure
WATER TANK PRESSURE GAUGE - CONTENTS: Water tank pressure gauges, how to find, repair, use water pressure gauges on private wells and water tanks. How to repair or replace a broken or clogged water pressure gauge. How to use the water pressure gauge to diagnose well and pump problems: leaks, lost pressure, short cycling well pump, bad water pressure in the building, bad check valve or foot valve - yep, this gauge can help debug several well and pump problems
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Water pressure gauges:
This article describes the location, use, and operation water tank pressure gauges, how to read, use, repair or replace water pressure gauges.
We discuss water pressure gauge location, accuracy, and uses on water well pump and tank systems. A well pump gauge can help diagnose a variety of well and pump problems including leaks, bad check valves, bad well pumps and more.
WATER PRESSURE GAUGE - location, uses, accuracy, repairs
In this photo the water tank pressure gauge is visible mounted on a special brass fitting which is in turn
connected to the bottom of the water pressure tank.
The water tank pressure gauge is showing about 37 PSI.
[Click to enlarge any image]
water tank pressure gauges give a general idea of the water pressure measured at the water tank, and that
the pressure shown on the gauge will normally drop down to the "pump cut-in pressure" at which point
the water pump should start operating, and the gauge pressure will then rise up
to the pump "cut out pressure" when the water pump stops.
Water Pressure Indicator Gauge Accuracy
Typical residential water system pressure gauges found at the water tank or water pump are only approximate and are not lab instrument
grade, but the water pressure gauge is a very helpful diagnostic when you're diagnosing a loss of water pressure
or pump operating problem as well as when you're adding air to a water tank.
How to Repair or Replace the Water Pressure Indicator Gauge on a Water Tank or Pump
The text below describes the steps in replacement of a broken or leaky or otherwise defective water pressure gauge.
If you are installing a new pressure gauge where none has been previously installed, or for more water pressure gauge mounting location options
see WATER PRESSURE GAUGE INSTALLATION.
How to Replace a Broken Water Pressure Gauge, or How to Correct A Water Pressure Gauge that Reads too High or Too Low
If the water pressure GAUGE GLASS BROKEN or MISSING [link to article on water tank air volume controls], or if the gauge is visibly rusty or
damaged, or if the gauge simply stops changing what it indicates despite the water system pressure changing
(in other words the pressure shown on the gauge never changes) you should replace the gauge itself.
The well pump is turned off, pressure is drained from the system (you do not have to let all of
the water out of the tank, just be prepared for a little spillage). Then the new water pressure gauge is prepared
for installation (make sure the gauge bottom threads match those of the old unit being replaced as
diameters vary from 1/4" to 1/2").
Turn off power to the water pump and drain most or all water pressure from the system.
Have at hand a new water pressure gauge of the proper pressure sensing range - and be sure that the pipe thread diameter of the gauge mounting base is the same as that on the old gauge so that you won't also need an adapter to mount the new gauge in the old position.
Prepare the new pressure gauge mounting threads by wrapping with teflon tape or applying pipe joint sealing compound - keep the compound away from the opening at the bottom of the gauge through which water passes, or you may clog your new gauge early.
We put our teflon tape or pipe dope on the new gauge threads before trying to remove the old gauge. Then the old gauge is removed by using a wrench
on the brass fitting at the bottom of the gauge.
Use a wrench on the brass base of the old gauge to unscrew it. DO NOT try to remove a water pressure gauge
by twisting the gauge body itself - you'll just break it off and you may get cut or start a water leak.
Remove the old water pressure indicator gauge. Clean any debris around the gauge mounting hole - or water squirting out may do this for you.
Calmly screw in the new one even though water is flowing out of the gauge
Screw in the new gauge first by hand to be sure that you are threading it correctly don't "cross" thread the gauge into the mounting opening or it will leak. Finish tightening the water pressure gauge in place with a wrench around the brass gauge base.
Tighten the new gauge carefully in position with a wrench on the gauge bottom brass
fitting. Do not over-tighten, but screw in the new gauge until there is no water leakage.
Screw in the new gauge first by hand, finishing it with a wrench around the brass gauge base. Turn pump electrical power back on. Observe new gauge pressure indications for normal operation. If you are confident that the new pressure gauge is properly installed and in good condition but water pressures are incorrect, the problem may be at the water pump pressure control itself.
Water Pressure Gauge Troubleshooting
Reader Question: 8/9/14 Andrew said:
Hi I recently replaced our submersible water pump (DAB Pulsar 40/50 M), because of a faulty electrical component in the pump. I looked around to see if I could get it repaired but the cost was excessive compared the a new one. (It was over 10 years old).
There is a float switch attached to the pump which works in conjunction with a pressure switch and gauge mounted on top of the pressurized cold water cylinder.
The system is set to a max pressure of 3 bar. When the pressure drops to about 1.5 bar the pump automatically recharges the water cylinder. After I replaced the pump everything was working fine again, until recently.
I started getting erratic re-filling of the tank. The pressure would drop and the pump wouldn't cut in to recharge the cylinder.
5 minutes later the system would recharge. There is plenty of water in the well, so naturally I thought it was the switch or gauge.
I've just replaced both.
The problem now is that when the pump is switched on the system recharges but the gauge is not registering any pressure and the switch doesn't turn the pump off. If I let it run I'm sure it would explode.
[dysfunctional links removed]
I've read through your extensive notes and explanations but can't find anything which specifically relates the our problem.
I would really appreciate your advice and or comments to help resolve this issue. Many thanks in advance.
If your water supply contains silt, iron, debris or the like, I suspect that the gauge pressure port is clogged and possibly there is similar clogging of the pressure sensing port of the pressure control switch. Try replacing the gauge, and cleaning or replacing any clogged small-diameter piping - same for the pressure switch. Keep us posted.
Reader question: relation of water pressure gauge to well pump short cycling
30 Dec 2015 Bev wrote:
Will a broken pressure gauge on a water pump for a two line well system cause short cycles when pumping water into the tank on the interior of the house.
No Bev. Pressure gauges are passive devices - they do nothing but reflect system pressure.
But it is worth noting that some of the causes of improper or erratic water pump operation, such as debris clogging of a pressure switch sensor port can also cause erratic pressure gauge operation by clogging its own pressure sensor opening as well.
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Thanks to readers Nancy and Eric for questioning water pump gauge inaccuracies 11/2/2009
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