Ariz. Admin. Code § R20-5-415 - Boiler Blowdown, Blowoff Equipment and Drains
A. Except as provided in this Section, an
Owner, Operator, or User of blowdown and blowoff equipment shall comply with
the National Board of Boiler and Pressure Vessel Inspectors, A Guide for
Blowoff Vessels, NB-27, Revision 1 (1/13), 2012 Edition, incorporated by
reference. This incorporation does not include any later amendments or editions
of the incorporated material. A copy of this referenced material is available
for review at the Industrial Commission of Arizona, 800 W. Washington Street,
Phoenix, AZ 85007 and may be obtained from the National Board of Boiler and
Pressure Vessel Inspectors, 1055 Crupper Avenue, Columbus, OH 43229-1183 or at
http://www.nationalboard.org/.
B. Blowdown from a Boiler is a hazard to life
and property.
C. Blowdown from a
Boiler shall pass through blowdown equipment that reduces pressure and
temperature to levels not exceeding 5 p.s.i.g. and 140° F.
D. The thickness of a blowdown vessel shall
be at least 3/16".
E. All blowdown
equipment shall be fitted with openings that allow cleaning and inspection of
the equipment.
F. Blowdown
Separators may be used with Boilers instead of Boiler Blowdown Tanks, provided
that Blowdown Separators are operated with a temperature gauge and water cooler
to prevent drain water temperature from exceeding 140° F.
G. In addition to the requirements of
subsections (A) through (F), the following requirements apply to blowdown
piping, valves and drains for Power Boilers: Each Power Boiler and High
Temperature Water Boiler shall be installed and maintained according to ASME
Code, Section 1 and B31.1, incorporated by reference in
R20-5-404, at the time of
installation.
H. In addition to the
requirements of subsections (A) through (F), the following requirements apply
to bottom blowdown or drain valves for heating Boilers and Lined Hot Water
Heaters:
1. A hot water heating Boiler or
Lined Hot Water Heater shall have a bottom blowdown or drain pipe connection
fitted with a valve or cock connected with the lowest available water space
with the minimum size of blowdown piping and valves as required by ASME Code,
Section IV, incorporated by reference, in
R20-5-404(A).
2. Discharge outlets of blowdown pipes,
Safety Valves, Relief Valves, or Safety Relief Valves, and other piping shall
be located and structurally supported to prevent injury to
individuals.
Notes
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