You would need to know the length of the pipe in order to answer the question. The equation for volume of a cylinder is V=πr2h. For example, for one foot of 2" pipe, you would multiply 3.14 by 2" by 12" and find you have 37.7 cubic inches of volume inside the pipe.
1.6 gallons of water.
5.435 imperial gallons or 6.794 US gallons
Volume of the pipe = 4.896 gallons
0.37 US gallons.0.37 US gallons.0.37 US gallons.0.37 US gallons.
That depends on how long the pipe is.
5.5 gallons per 15 feet of 3-inch pipe.
2.61153 gallons.
This pipe will hold 23,500.7 gallons of water.
There need not be any water in the pipe.Assuming that it is a 10 inch diameter pipe, then its capacity is 4.08 US gallons.
You would need 2,451 feet of 2-inch pipe for 400 gallons.
0.3672 gallon per foot of pipe.
This pipe will hold 1,468.8 gallons of water.