| (1) Each unfired steam boiler shall have a pressure
gage that is readable. The dial of the pressure gage shall be graduated
to approximately double the pressure at which the safety valve is
set, but in no case, less than one and one-half times this pressure.
The pressure gage shall be connected to the steam space, to the water
column, or its steam connection. A valve or cock shall be placed in
the gage connection adjacent to the gage. An additional valve or cock
may be located near the boiler providing it is locked or sealed in
the open position. No other shutoff valves shall be located between
the gage and the boiler. The pipe connection shall be of ample size
and arranged so that it may be cleared by blowing down. The gage or
connection shall contain a siphon or equivalent device which will
develop and maintain a water seal that will prevent steam from entering
the gage tube.
(2) Each unfired steam boiler, must have a valved connection
at least 1/4 inch nominal pipe size (8 mm), connected to the steam
space for the exclusive purpose of attaching a test gage when the
boiler is in service to test the accuracy of the pressure gage.
(h) Stop valves.
(1) Each steam outlet from an ASME Code, Section I
unfired steam boiler, shall be fitted with a stop valve located as
close as practicable to the boiler.
(2) When a stop valve is located such that it allows
water to accumulate, ample drains shall be provided. The drain shall
be piped to a safe location and shall not be discharged on the boiler
or its setting.
(3) When boilers that are provided with manholes or
other similar openings that permit access for human occupancy are
connected to a common steam main, the owner or operator shall ensure
that the boiler to which entry is being made is completely isolated
from the steam main. This may be accomplished with the use of two
stop valves with an ample drain between them, with a full isolation
blind or removal of piping such that the boiler is no longer connected
to the steam main.
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| Source Note: The provisions of this §65.608 adopted to be effective June 15, 2015, 40 TexReg 3121; amended to be effective February 15, 2016, 41 TexReg 795; amended to be effective January 15, 2018, 43 TexReg 75; amended to be effective February 15, 2019, 44 TexReg 583 |
