12 CRR-NY 14-9.4NY-CRR

STATE COMPILATION OF CODES, RULES AND REGULATIONS OF THE STATE OF NEW YORK
TITLE 12. DEPARTMENT OF LABOR
CHAPTER I. INDUSTRIAL BOARD OF APPEALS
SUBCHAPTER A. THE INDUSTRIAL CODE
PART 14. CONSTRUCTION, INSTALLATION, INSPECTION AND MAINTENANCE OF HIGH PRESSURE BOILERS; CONSTRUCTION OF UNFIRED PRESSURE VESSELS
SUBPART 14-9. POWER BOILERS: NEW INSTALLATIONS
SAFETY VALVES AND SAFETY RELIEF VALVES
12 CRR-NY 14-9.4
12 CRR-NY 14-9.4
14-9.4 Safety valve requirements.
(a) Each boiler shall have at least one safety valve and if it has more than 500 square feet of bare tube water heating surface, or if an electric boiler has a power input more than 1,100 kw, it shall have two or more safety valves or safety relief valves. For a boiler with combined bare tube and extended water-heating surface exceeding 500 square feet, two or more safety valves or safety relief valves are required only if the design steam generating capacity of the boiler exceeds 4000 lb/hr. The method of computing the steam-generating capacity of the boiler is given as follows:
The maximum quantity of fuel C that can be burned per hour at the time of maximum forcing is determined by a test. The maximum number of heat units per hour, or CH, is then determined, using the values of H given in the Table below. The weight of steam generated per hour is found by the formula:
W =C × H/1100 × 0.75
where
W = weight of steam generated/hr, lb
C = total weight or volume of fuel burned/hr at time of maximum forcing, lb or cu ft
H = heat of combustion of fuel, Btu/lb or Btu/cu ft (See Table below)
The sum ot the safety valve capacities marked on the valves shall be equal to or greater than W.
For the purpose of checking the safety valve capacity, the following values of heats of combustion of various fuels may be used:
H = Btu/lb
Semibituminous coal
 
14,500
Anthracite
 
13,700
Screenings
 
12,500
Coke
 
13,500
Wood, hard or soft, kiln dried
 
7,700
Wood, hard or soft, air dried
 
6,200
Wood shavings
 
6,400
Peat, air dried, 25% moisture
 
7,500
Lignite
 
10,000
Kerosene
 
20,000
Petroleum, crude oil, Pennsylvania
 
20,700
Petroleum, crude oil, Texas
 
18,500
Municipal solid waste
 
7,800
H = Btu/cu ft
Natural gas
 
960
Blast-furnace gas
 
100
Producer gas
 
150
Water gas, uncarbureted
 
290
(b) Organic fluid vaporizer generators require special consideration as given in the ASME Code.
12 CRR-NY 14-9.4
Current through March 15, 2022
End of Document

IMPORTANT NOTE REGARDING CONTENT CURRENCY: The "Current through" date indicated immediately above is the date of the most recently produced official NYCRR supplement covering this rule section. For later updates to this section, if any, please: consult editions of the NYS Register published after this date; or contact the NYS Department of State Division of Administrative Rules at [email protected]. See Help for additional information on the currency of this unofficial version of NYS Rules.