Wisconsin Statutes Employment, Compensation and Mining (Ch. 101 to 109) § 101.17. Machines and boilers, safety requirement

(2) Chemical recovery boiler inspections. (a) If the owner or user of a chemical recovery boiler maintains insurance coverage for the boiler and is in good standing with the insurer that provides the coverage, no periodic inspection, including an internal inspection, of the boiler or any of its components that requires taking the boiler out of service may be required more frequently than once every 24 months.

(b) If the owner or user of a chemical recovery boiler applies to the department for an exemption from a periodic inspection requirement, or an extension of the period between inspections that is required, and the application is made at least 120 days before the expiration of the inspection period that applies to the boiler, the department shall take final action on the application at least 90 days before the expiration of that inspection period.