A four-foot diameter pipe that is five feet long has a volume of 470 gallons.
3780 gallons
20 quarts. There are 4 quarts in a gallon, so 4x5=20.
As many as you like, depending on how long the pipe can be.
This pipe will hold 23,500.7 gallons of water.
0.255 gallons per foot of pipe. A 10 ft long pipe that size holds 2.55 gallons.
Volume of the pipe = 4.896 gallons
The pipe can hold up to 6,762.39 US gallons of water.
This pipe will hold 1,468.8 gallons of water.
That depends on how long the pipe is.
2.61153 gallons.
4.08 US gallons.
A pipe this size holds 1,642 (1,642.12358) US gallons.