In vinyl chloride service
In vinyl chloride service means that a piece of equipment either contains or contacts a liquid that is at least 10 percent vinyl chloride by weight or a gas that is at least 10 percent by volume vinyl chloride as determined according to the provisions of 61.67(h). The provisions of 61.67(h) also specify how to determine that a piece of equipment is not in vinyl chloride service. For the purposes of this subpart, this definition must be used in place of the definition of in VHAP service in subpart V of this part.
40 CFR § 61.61
Terms used in this subpart are defined in the Act, in subpart A of this part, or in this section as follows: