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Water Tank Plumbing Help and Tips Class A Customs

Posted by on 6/3/2019 to Water Tanks & Accessories
How do you plumb a water tank?

You need to vent (allow air in and out when filling and emptying) the tank. If you do not the tank will be damaged.

You can not hook a garden hose to the tank, this is pressurized water and will damage the tank.

What fittings do I need?
This will depend on how you are running the tank. It is recommended to use plastic fittings because the tank has plastic fittings, metal fittings can damage the threads.

How do you get the correct fittings?
All of the threaded fittings we carry are NPT (National Pipe Thread Standard).

1/2" Female NPT Fitting - You will need to get a male fitting to use with this.

1 1/2" Female NPT Fitting - You will need to get a male fitting to use with this.

1 1/4" Outer Diameter x 2" Long x 15/16" Inner Diameter Smooth Pipe


National Pipe Threads (NPT)

Pipe sizes do refer to physical dimensions, but the plumbing industry standard for the sizes of pipe is not always as straight-forward as measuring the pipe. Measuring the pipe will oftentimes mislead you into choosing the wrong pipe, so do take care. The "pipe thread size" as shown in column 3 of the table below is measured and based on the inside of the pipe. But, to actually determine the size of a pipe, the outside diameter of each pipe or fitting must be measured and compared to the table for size identification. For example, a 3/4" NPT pipe thread has an outside diameter of 1.050 inches. Each thread size has a defined number of threads per inch (TPI). The 3/4" NPT pipe thread has 14 threads per inch. Both the TPI (threads per inch) and OD (outside diameter) of the thread are required for positive identification of thread size because several sizes have the same TPI.

pipe thread specifications

Male threads: Measure the outside diameter of the large portion of the thread at "A"; Find figure nearest this dimension in column 1 or 2 of chart. The dimension in column 3 will be your nominal pipe thread size.

Female Threads: Measure top diameter of thread at "B"; Find figure nearest this dimension in column 1 or 2 of chart. The dimension in column 3 will be your nominal pipe thread size.



Col 1

(Dimension A)

Col 2

(Dimension A)

Col 3

(Dimension B)

Col 4

(Dimension C)

Col 5

Col 6

OD

Fraction Inch

(quick reference only)

OD Actual

(inches)

Pipe Thread

Size

Normal engagement

for tight joint

Threads

per Inch

Circumference

(inches)

5/16

0.3125

1/16

0.2611

27

0.9817

13/32

0.405

1/8

0.2639

27

1.272

35/64

0.540

1/4

0.4018

18

1.696

43/64

0.675

3/8

0.4078

18

2.121

27/32

0.840

1/2

0.5337

14

2.639

1-3/64

1.050

3/4

0.5457

14

3.299

1-5/16

1.315

1

0.6828

11-1/2

4.131

1-21/32

1.660

1-1/4

0.7068

11-1/2

5.215

1-29/32

1.900

1-1/2

0.7235

11-1/2

5.969

2-3/8

2.375

2

0.7565

11-1/2

7.461

2-7/8

2.875

2-1/2

1.1375

8

9.032

3-1/2

3.5

3

1.2000

8

10.995

4

4.0

3-1/2

1.2500

8

12.566

4-1/2

4.5

4

1.3000

8

14.137

5-5/8

5.563

5

1.4063

8

17.476

6-5/8

6.625

6

1.5125

8

20.812

8-5/8

8.625

8

1.7125

8

27.095

10-3/4

10.75

10

1.9250

8

33.771

12-3/4

12.75

12

2.1250

8

40.054



Definition of pipe thread acronyms

NPT

National Pipe Thread (tapered)

FPT

Female Pipe Thread (interchangeable with NPT)

FIP

Female Iron Pipe (interchangeable with NPT)

MPT

Male Pipe Thread (interchangeable with NPT)

MIP

Male Iron Pipe (interchangeable with NPT)

IPS

Iron pipe size (interchangeable with NPT)

PTF

SAE short taper pipe thread

NPTF

National Pipe Thread Fuel (American National taper pipe thread for dryseal pressure-tight joints)

NPSM

National Pipe Straight Mechanical (American National straight pipe thread for mechanical joints)

NPSI

American National straight intermediate pipe thread

GHT

Garden Hose thread

NST

National Standard Thread (Fire Hose thread)

BSPT

British Standard taper pipe thread (metric dimensions)


What fittings do you sell?

When you add fittings to your water tank this will increase the length of the tank, be sure to account for this when deciding on a tank.