Modern Gasworks Practice

464 MODERN GASWORKS PRACTICE the gas is only some 3 grains per 100 cubic feet. This consideration should therefore be sufficient, to emphasize the necessity for employing means at the works to reduce the naphthalene content to certainly not more than 3 grains per 100 cubic feet. Grains of Naphthalene carried per 100cu.ft. ofgas measured at temperature ofexperiment and under a total pressure of 760mm. of Mercury. Q1 O O1 O U1 O O ui O Ö] _____I -x-T-rrm 11 i I i i 11 I Ö" "5 io~ 15 2Ö 25 30 35 40 45 50 55 60 Temperature (°C.) Fig. 286.—Curves SHOWiNG Naphthalene Saturation of Coal Gas (Thomas). Thomas has shown that the number of grains of naphthalene (W) sufficient to saturate 100 cubic feet of dry coal gas at normal temperature and pressure may be calculated at any temperature in the range 0° to 60° C. by the formula— log10W = 14-2739 - 0-02593 log10 d, (j where 6 is the absolute temperature Centigrade.