Iowa Code r. 875-92.10 - Steam stop valve requirements
This rule applies to power boilers installed prior to July 1, 1983. Each steam outlet from a boiler, except safety valve and water-column connections, will be fitted with a stop valve located as close as practicable to the boiler. When a stop valve is so located that water can accumulate, ample drains will be provided. The drainage will be piped to a safe location and will not be discharged on the top of the boiler or its setting. When boilers provided with manholes are connected to a common steam main, the steam connection from each boiler will be fitted with two stop valves having an ample free-blowing drain between them. The discharge of the drain will be piped clear of the boiler setting. The stop valves will consist of one automatic nonreturn valve next to the boiler and a second valve of the outside screw and yoke type.
Notes
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