Process vacuum system

J. L. Ryans and D. L. Roper, Process Vacuum System Design and Operation, McGraw-HiU, Inc., New York, 1986. 

Air is usually the basic load component to an ejector, and the quantities of water vapor and/or condensable vapor are usually directly proportional to the air load. Unfortunately, no reliable method exists for determining precisely the optimum basic air capacity of ejectors. It is desirable to select a capacity which minimizes the total costs of removing the noncondensable gases which accumulate in a process vacuum system. An oversized ejector costs more and uses unnecessarily large quantities of steam and cooling water. If an ejector is undersized, constant monitoring of air leaks is required to avoid costly upsets. 

Figure 2-46. Typical flow velocities for vacuum lines. Note 1 torr = 1.33 mb = 133.3 Pa. 1.0 ft/sec = 0.3048 m/seo. By permission, Ryans, J. L. and Roper, D. L., Process Vacuum System Design Operation, McGraw-Hill Book Co., Inc., 1986 [18].

Ryans, J. L. and Roper, D. L., Process Vacuum Systems, 1986, McGraw-Hill Book Co. 

Figure 3-45. High altitude process vacuum system, NPSH requirements.

Example 3-6 NPSH Available in Vacuum System, 191 Example 3-7 NPSH. Available in Pressure System, 191 Example 3-8 Closed System Steam Surface Condenser NPSH Requirements, 191 Example 3-9 Process Vacuum System, 192 Reductions in NPSHr, 192 Example 3-10 Corrections to NPSHr for Hot Liquid Hydrocarbons and Water. 192 Example 3-9 Process Vacuum System, 192 Example 3-10 Corrections to NPSHr for Hot Liquid Hydrocarbons and Water, 192 Example 3-11 Alternate to Example 3-10, 194 Specific Speed,... 

Process Vacuum System NSR Vacuum service lines penetrate SCBs... 

Zone 2A hydraulic elevator operation fire detection system operation fire suppression system operability process vacuum system operation standby electrical power system operation ... 

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