Iron Sulfide Sample Clauses

Iron Sulfide. The presence of sulfur in the gas may promote the formation of iron sulfides. Under certain conditions, iron sulfide is a pyrophoric material that can autoignite at atmospheric pressure and temperature when exposed to air. Extreme care must be taken when servicing gas fuel cleanup equipment to avoid accidental exposure to oxygen and subsequent combustion of filter material. APPENDIX 1 The effective particle size for erosion considerations is determined by a particle's terminal settling velocity. The size and density distribution of the solid particles must be such that not more than 1.0 percent by weight of the particles shall have a terminal settling velocity in air (70(Degrees)F (21(Degrees)C) and 30 inches Hg, absolute) greater than 14 inches per minute, and not more than 0.1 percent shall have a terminal settling velocity in excess of 23 inches per minute. For a solid spherical particle, Stoke's Law of settling permits calculating the terminal settling velocity if the particle size and shape and particle specific gravity are known. The following tabulation gives the spherical particle diameters equivalent to the limiting terminal settling velocities for particles of specific gravity 2.0 and 4.0. ------------------------------- ------------------------------ ------------------------------- SETTLING VELOCITY SPECIFIC GRAVITY EQUIVALENT SPHERICAL PARTICAL (BASED ON WATER) (inches/mm) DIAMETER (microns) ------------------------------- ------------------------------ ------------------------------- 14 2 10 23 2 13 14 4 7 23 4 9 ------------------------------- ------------------------------ -------------------------------