0466) V V 8 t = _____ P 1- __f P o It is a formula for accurately estimating tank size for systems. 3 VAPOR PRESSURE - INCHES OF MERCURY-20 0 10 20 25 30 35 40 45 50 55 60 65 70 75 80 85 DEW POINT - °F. The flow equations used for sizing for liquids have their roots in: - Bernouilli’s energy equation - the “continuity” equation. piping, fittings, and valves of the proper pressure rating are suitable for ammonia gas and liquid. Chilled Water Pipe Header Size Calculation Post by mirfan389 » Wed Aug 18, 2010 11:44 pm I am working on district cooling by using chillers. Further details on specific piping systems can be found in appropriate chapters of the ASHRAE Handbook. 5, Refrigerant Piping and IIAR Standard 2, which states the following: 1. This is especially important when creating custom labels for a facility. Another open loop system is the ice builder, which is made of steel or copper coils submerged in a tank of water. 10 Example Convert rectangular duct 22" x 12" to equivalent round a = 22, b = 12; from above table De= 17.