Willian's line follows the law
where
b = A constant representing the shape of the Willian's line,
a = Another constant i.e. no load consumption per hour,
I.P. = Indicated power, and
m = Steam consumption per hour.
1
I.P. = a × m + b
2
m = a + b × I.P.
3
I.P. = b × m + a
4
m = b/I.P - a