For steam flowing through an orifice from a higher to a lower pressure where the lower pressure is greater than 58 per cent of the higher, the flow per minute may be calculated from the formula:
|
| Where | W | = | the weight of steam discharged in pounds per minute, |
| A | = | area of orifice in square inches, | |
| P | = | the absolute initial pressure in pounds per square inch, | |
| d | = | the difference in pressure between the two sides in pounds per square inch, | |
| K | = | [Pg 322] a constant = .93 for a short pipe, and .63 for a hole in a thin plate or a safety valve. | |
Vesta Coal Co., California, Pa., Operating at this Plant 3160 Horse Power of Babcock & Wilcox Boilers
FOOTNOTES
[ [80] ] D, the density, is taken as the mean of the density at the initial and final pressures.
[ [81] ] Diameters up to 5 inches, inclusive, are actual diameters of standard pipe, see [Table 62] , page [308] .
[ [82] ] Diameters up to 4 inches, inclusive, are actual internal diameters, see [Table 62] , page [308] .