Group 1 Storage Vessels at New Affected Sources Producing the Listed Thermoplastics

Thermoplastic Chemical a Vessel capacity (cubic meters) Vapor pressure b (kilopascals) ASA/AMSAN c Styrene/ acrylonitrile mixture ≥3.78 ≥0.47 Acrylonitrile ≥75.7 ≥1.62 SAN, continuous d All chemicals ≥2,271 ≥0.5 and <0.7 <151 ≥10 ≥151 ≥0.7 Nitrile c Acrylonitrile ≥13.25 ≥1.8 Polystyrene, continuous processes All chemicals ≥19.6 and <45.4 ≥7.48 ≥45.4 and <109.8 ≥0.61 ≥109.8 ≥0.53 ABS, continuous mass Styrene ≥45.43 ≥0.078 All other chemicals ≥38 and <45.43 ≥13.1 ≥45.43 ≥0.53 a Vessel capacity and vapor pressure criteria are specific to the listed chemical, to “all chemicals,” or to “all other chemicals,” as indicated. b Maximum true vapor pressure of total organic HAP at storage temperature. c The applicability criteria in Table 4 of this subpart shall be used for chemicals not specifically listed in this table (i.e., Table 5). d The control level for the first two sets of applicability criteria are specified in 63.1314 as 90% and 98%, respectively. The control level for the third set of applicability criteria is the HON control level of 95%. [64 FR 11553, Mar. 9, 1999]