Sec. 14-10.20. Stop valves

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(a) Each steam outlet from a power boiler (except safety-valve connections) shall be fitted with a stop valve located as close as practicable to the boiler.
(b) When two or more boilers having manhole openings are connected to a common steam main, two stop valves with ample freeblow drain between them shall be placed in steam connection between each boiler and the steam main. The discharge of this drain valve shall be visible by the operator while manipulating the valve.
(c) When a stop valve is so located that water can accumulate, ample drains shall be provided.

                    
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