ejector
Ejectors Give Any Suction Pressure
Recent tests on multistage ejector systems will simplify your task of designing vacuum-producing equipment for any pressure.
F. DUNCAN BERKELEY
GRAHAM MANUFACTURING CO., INC., BATAVIA, N.Y.
B
ecause of overlapping performance, it’s often a lengthy problem to arrive at the most economical design of an ejector. In practically every new application of high vacuum, we find it necessary to investigate thoroughly the many available means of producing vacuum to reduce equipment and operating costs to a practical and profitable level.
But the giant strides of technology have brought to light an entirely new concept in the study of vacuum-producing apparatus. Recent tests of 5-stage and 6-stage systems indicate that
Chemical Engineering, April 1957
steam ejectors have carved a unique and popular place in industry where large volumes of gases must be evacuated—and they can produce almost any desired suction pressure.
In addition, by using only certain parts of a multistage system, one installation can serve the whole range of test conditions.
The simple principles on which ejectors operate and the almost universal use of steam and compressed air in plants of all kinds have given the ejector many advantages over other vacuum pumps. However, in spite of simple operating principles, the most economical design of an ejector is often a lengthy problem.
1
Among the variables that you should consider in selecting a particular design of steam ejector are:
1.
Suction pressure required.
2.
Steam available.
3.
Water available.
4.
Fluid to be evacuated.
5.
Equipment cost.
6.
Installation cost.
When we reach supersonic-flow velocities, shock waves are unavoidable in converting velocity back to pressure. These shock losses in the diffuser become more severe as the diffuser entrance velocity (velocity of compression) is increased. This, in turn, limits the discharge pressure
Recent tests on multistage ejector systems will simplify your task of designing vacuum-producing equipment for any pressure.
F. DUNCAN BERKELEY
GRAHAM MANUFACTURING CO., INC., BATAVIA, N.Y.
B
ecause of overlapping performance, it’s often a lengthy problem to arrive at the most economical design of an ejector. In practically every new application of high vacuum, we find it necessary to investigate thoroughly the many available means of producing vacuum to reduce equipment and operating costs to a practical and profitable level.
But the giant strides of technology have brought to light an entirely new concept in the study of vacuum-producing apparatus. Recent tests of 5-stage and 6-stage systems indicate that
Chemical Engineering, April 1957
steam ejectors have carved a unique and popular place in industry where large volumes of gases must be evacuated—and they can produce almost any desired suction pressure.
In addition, by using only certain parts of a multistage system, one installation can serve the whole range of test conditions.
The simple principles on which ejectors operate and the almost universal use of steam and compressed air in plants of all kinds have given the ejector many advantages over other vacuum pumps. However, in spite of simple operating principles, the most economical design of an ejector is often a lengthy problem.
1
Among the variables that you should consider in selecting a particular design of steam ejector are:
1.
Suction pressure required.
2.
Steam available.
3.
Water available.
4.
Fluid to be evacuated.
5.
Equipment cost.
6.
Installation cost.
When we reach supersonic-flow velocities, shock waves are unavoidable in converting velocity back to pressure. These shock losses in the diffuser become more severe as the diffuser entrance velocity (velocity of compression) is increased. This, in turn, limits the discharge pressure