Once again, note that this is not the size of the expansion tank needed. This is the net amount of water expansion that the expansion tank will see. Thus, utilizing Equation Venet, Venet = 16.9 – (1.8 + 0.03) = 15 gallons. From Last example, 1,000 gallons of water going from 40☏ to 140☏ expands 16.9 gallons. The initial system volume of water (Vs 1) equals Vmat 1 + Vmat 2, or 900 gallons + 100 gallons. Total volume of copper piping = 100 gallons Utilizing Equation Vemat for copper, Vmat 2 = 100 gallons and Vemat 2 = 100 (28.5 × 10–6)(140 – 40) = 0.3 gallon. 2), first look at Table above to determine the volume of each size of pipe: Utilizing Equation Vemat for the steel (material no. Assuming that the initial temperature of the water is 40☏ and the final temperature of the water is 140☏, (1) how much will each material expand, and (2) what is the net expansion of water that an expansion tank will see? It has 100 feet of 4-inch piping, 100 feet of 2-inch piping, 100 feet of 1½-inch piping, and 300 feet of ½-inch piping.
This type of expansion tank does not allow the water and air to be in contact with each other.Ī domestic hot water system has a water heater made of steel with a volume of 900 gallons. It is based on the use of a diaphragm or bladder-type expansion tank, which is the type most commonly used in the plumbing industry. The following discussion explains how to size an expansion tank for a domestic hot water system and the theory behind the design and calculations. It does this by utilizing a pressurized cushion of air (figure below). When properly sized, an expansion tank connected to the closed system provides additional system volume for water expansion while ensuring a maximum desired pressure in a domestic hot water system. Repeated excessive pressures can lead to equipment and pipe failure and personal injury. It is not designed or intended for continuous usage. A relief valve installed on a water heater is not a control valve, but a safety valve. These pressures can quickly rise to a point at which the relief valve on the water heater unseats, thus relieving the pressure, but at the same time compromising the integrity of the relief valve.
Closed Hot Water System Showing the Effects as Water and Pressure Increase from (A) P 1 and T 1 to (B) P 2 and T 2
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