Reliance Water Heaters PMDH-7, PMDI-2 WHY Pump Tanks are Important, HOW to Install a Pump Tank

WHY PUMP TANKS ARE IMPORTANT

A pump tank is an essential part of any well system, delivering these benefits:

nIt ensures that your pump will run for at least one minute each time it cycles, as required by pump manufacturers.

nIt stores a supplemental water supply between pump cycles, to reduce the number of cycles throughout the day, and helps prolong pump life.

nIt helps maintain water pressure within your system, ensuring proper operation of your dishwasher and washing machine, and robust flow for showering and bathing.

A properly sized pump and pump tank will work as a team to meet your needs and will deliver many years of dependable service.

HOW TO INSTALL A PUMP TANK

Each STA-CHARGED Pressurized Diaphragm Tank includes a detailed, manual that takes you step-by-step through installation procedures such as:

1.Determining proper tank location.

2.Attaching the acceptance fittings.

3.Adjusting the tank pre-charge pressure.

4.Leveling the tank and connecting it to the water supply line.

5.Fine-tuning the tank to assure lag-free delivery.

TOOLS NEEDED FOR INSTALLATION

n	Screwdriver	n	Pipe Wrench	n	Hacksaw
n	Pliers	n	Teflon Tape	n	Pressure Gauge

MODEL, ITEM, DIMENSIONS & DRAWDOWN

Drawdown is the actual useable water a tank can deliver during a cycle.

Drawdown will vary depending on the operating pressure range

set for your pump tank. Drawdown is a function of the tank volume. Approximately 1/3rd of the tank total volume is usable water.

NOTE: The maximum working pressure is 100 PSI. Install a pressure relief valve on every pump installation.

HORIZONTAL

A TYPICAL PUMP TANK INSTALLATION

DIAPHRAGM PUMP TANKS

nFor dependable protection of your jet or submersible well pump

nSteel shell with powder-coated exterior for maximum corrosion resistance

nMetal air charge valve

is conveniently located and resistant to mechanical damage

nStrong butyl diaphragm delivers dependable service

nEpoxy-coated inner shell protects the water reservoir

HOW A DIAPHRAGM PUMP TANK WORKS

HOW TO SIZE A PUMP TANK

(Tire Gauge)

1. START-UP CYCLE

Diaphragm is pressed

3. HOLD CYCLE

Pump-cutoff pressure

1.If you know your current pump size, use columns 2 and 3 in the sizing chart to make your tank selection.

2.If you do not know your pump size or the size of your current tank, count all your water fixtures. Be sure to include sinks, tubs, showerheads, outside faucets, utility sinks, dishwasher, washing machine, etc. Count each fixture individually. Use columns 1 and 3 in the size chart to make your tank selection.

3.If replacing a glass-lined or other “standard” tank with a diaphragm tank, use columns 3 and 4 in the size chart to make your tank selection.

MODEL	VOL.	DRAWDOWN	CONN SIZE	A	B	C	SHIPPING
	US GAL	30-50 PSI	NPT	INCHES	INCHES	INCHES	WEIGHT
			INCHES				LBS
FREE STANDING PUMP TANKS
PMD-14	14	4.3	1 F	24	2	15 3/8	24
PMD-20	20	6.2	1 F	31	2	15 3/8	34
PMD-26	26	8.1	1 F	38 1/2	2	15 3/8	40
PMD-32	32	9.9	1 F	46	2	15 3/8	52
PMD-45	45	13.9	1 1/4 F	35 1/2	2	22	65
PMD-65	65	20.1	1 1/4 F	47 1/2	2	22	90
PMD-85	85	26.7	1 1/4 F	60 1/8	2	22	114

FREE STANDING

REPLACING AN EXISTING PUMP TANK

against the bottom of

the chamber.

2. FILL CYCLE

Water is pumped

into the reservoir,

which forces the

diaphragm upward

into the air chamber.

is attained. Diaphragm

reaches its upmost position.

Reservoir is now filled to its

rated capacity.

4. DELIVERY CYCLE

Pump remains shut

off while air pressure

in top chamber

forces diaphragm

downward, delivering

water to the system.

SIZING CHART

1	2	3	4
NUMBER OF	ESTIMATED	DIAPHRAGM	“STANDARD”
WATER FIXTURES	PUMP SIZE	TANK MODELS	TANK SIZES
UP TO 7	5-7 GPM*	PMD-20, PMDH-20	42 GALLON
8-12	10 GPM*	PMD-45	82 GALLON
13-16	12-15 GPM*	PMD-65	120 GALLON
17-28	20 GPM*	PMD-85, PMD-119	220 GALLON
*GPM = Gallons Per Minute

PMD-119	119	37.0	1 1/4 F	61	2	26	161
IN-LINE PUMP TANKS
PMDI-2	2	.6	3/4 M	12 1/2	–	8 3/8	4.5
PMDI-5	4.6	1.4	3/4 M	14 3/4	–	11 3/8	7.5
PMDI-7	7	2.3	3/4 M	18 7/8	–	11 3/8	11
PMDI-14	14	4.3	1 M	24	2	15 3/8	24
HORIZONTAL	PUMP TANKS
PMDH-7	7	2.3	3/4 M	18 7/8	–	11 3/8	11
PMDH-14	14	4.3	1 M	20	–	15 3/8	24
PMDH-20	20	6.2	1 M	28	–	15 3/8	34

IN-LINE

A standard pump tank can be replaced with a diaphragm tank. This will ensure operation of a maintenance-free system.

nInstall a pressure relief valve at the tank connection to ensure system protection.

nBe sure to plug the air port on a jet pump, since outside air is no longer needed.

nAll open bleeder orafaces in the well casing must be plugged.

NOTE: A pressurized tank always takes up less space than a similar capacity standard pump tank.

1	2	35psi	3	4
	28psi		50psi	35psi

35psi 50psi 35psi

We also offer glass-lined tanks up to 120 gallons and galvanized tanks up to 900 gallons. Please call 1-800-365-4054 for more information.