Ariz. Admin. Code § 20-5-415

Current through Register Vol. 30, No. 50, December 13, 2024

Section 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.

Ariz. Admin. Code § R20-5-415

Repealed effective April 12, 1979 (Supp. 79-2). New Section adopted effective April 9, 1992 (Supp. 92-2). R20-5-415recodified from R4-13-415 (Supp. 95-1). Amended effective October 9, 1998 (Supp. 98-4). Amended by final rulemaking at 15 A.A.R. 1496, effective August 18, 2009 (Supp. 09-3). Amended by final rulemaking at 28 A.A.R. 3952, effective 12/7/2022.