This module will look at step nine. In the previous step we determined the minimum number of exhaust points within each reservoir to satisfy the extract requirements, however, this may have to be increased since for any specified layer depth, there is a maximum rate (MCRIT) at which smoky gases can enter any individual exhaust point. Any further attempt to increase the rate of exhaust through that exhaust point merely serves to draw air into the orifice from below the smoke layer. This is generally known as ‘plug-holing’.  

  Exercise 70

Exercise 71

Exercise 72

Exercise 73

Exercise 74

Exercise 75

Exercise 76

Exercise 77

Exercise 78

Exercise 79

Exercise 80