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(a) Where it is impracticable to remove the hood of any vertical fire-tube boiler for inspection purposes, an access opening of the following dimensions shall be provided in the hood:
(1) For boilers not exceeding thirty-six inches (36") diameter, not less than six inches by eight inches (6" x 8") or equivalent area with a minimum dimension of six inches (6") in any direction.
(2) For boilers over thirty-six inches (36") diameter, not less than twelve inches by sixteen inches (12" x 16") or equivalent area with a minimum dimension of eleven inches (11") in any direction and a minimum diameter of fifteen inches (15") for circular openings.
(b) Access for inspection and cleaning shall be provided in all boiler settings. The minimum dimension of access openings shall be 12 inches by 16 inches, unless the size and/or design of the boiler setting is such that inspection and cleaning can be adequately accomplished through smaller openings.
(c) When 2 or more steam, high-temperature water, or hot water heating boilers having manhole openings are installed in battery or connected to a common main or header, each boiler having a manhole opening shall be fitted with 2 stop valves between the boiler and the common main or header. An ample free blow drain shall be provided between the stop valves and the discharge from the drain shall be visible to the operator while manipulating the drain valve.
1. Amendment filed 11-2-66; effective thirtieth day thereafter (Register 66, No. 38). Approved by State Building Standards Commission.