By D.C. Teychenne

The second one variation of this best-selling e-book is still the traditional consultant on concrete combine layout. Amendments were made to permit for alterations within the terminology and fabrics used

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Additional resources for Design of Normal Concrete Mixes, 1st Edition

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Capped tees are provided on coils as a means of blowing out the water when the system is drained for freeze protection. The use of a gate valve with a hose bib should be considered in the dirt leg when floor drains are remote in relation to the unit. The bib makes it possible to connect a hose to the dirt leg for draining the coil. The dirt leg has a 7 / 8 in. nominal minimum diameter, should be approximately 18 in. long and be located at an accessible servicing point. A gate valve is preferred in the dirt leg because sediment passes thru it more freely than thru a globe valve.

For built-up systems the floor or base of the system (before and after the cooling coil) is used to gather the moisture. Since, under operating conditions. The drain water is subject to pressure conditions slightly above or slightly below atmospheric pressure, the Figure 56 illustrates the trapping of a drain line from the drain pan. The length of the water seal or trap depends on the magnitude of the positive or negative pressure on the drain water. For instance, a 2-inch negative fan pressure requires a 2inch water seal.

Therefore, select a Part 3. Piping Design | Chapter 3. Refrigerant Piping 51/8 in. 5 tons for 340 ft at a pressure drop 2 F. 3. The actual equivalent length of the suction line is determined in two parts, as follows: a. Riser section at evaporator – 10 ft + one 51/8 in. 2 ft. b. Balance1 of suction line system – 60 ft + seven 5 /8 in. 4 ft. 6 ft. 4. From Table 18, R –12, a 21/8 in. 7 tons at 20 F suction temperature. 5. Determine if the 21/8 in. 1The equivalent length of the riser is 10 ft + one 2 /8 in.

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