Nilfisk-Advance 21KBCAT, Operator'S Manual

Page: 7 / 64

ENGLISH / A-7
FORM NO. 56091024 - PBU Propane Stripper - A-7
MINIMUM RECOMMENDED DILUTION VENTILATION RATES FOR CARBON MONOXIDE EXPOSURE CONTROL
PROPANE-POWERED PBU FLOOR BURNISHER NILFISK-ADVANCE, INC.
Machine & Environment
See note 7
Propane Fuel
Consumption
(lbs/hour)
Calculated
CO
Generation
Rate (CFM)
Air Mixing
Factor K
(see Notes 3
and 4)
Dilution Ventilation Requirement, CFM (see Note 5)
Comment
Federal
OSHA PEL
(50 ppm CO)
NIOSH
REL (35
ppm CO)
Minnesota
OSHA PEL
(35 ppm
CO)
ACGIH TLV (25
ppm CO)
Machines without catalytic
converter; Moderate air
mixing
3.65 0.304 1.5 326 465 465 651
See Notes
4 & 5
Machines with catalytic
converter; Moderate air
mixing
3.65 0.216 1.5 232 331 331 463
See Notes
4 & 5
Machines without catalytic
converter; Poor air mixing
3.65 0.304 3.0 651 930 930 1302
See Notes
4 & 5
Machines with catalytic
converter; Poor air mixing
3.65 0.216 3.0 463 662 662 926
See Notes
4 & 5
Notes:
1 Abbreviations:
“CO” means carbon monoxide
“CO
2
” means carbon dioxide
“CFM” means cubic feet per minute
“PEL” means Permissible Exposure Limit. (The total exposure limit you can breathe during an eight hour period.) The PELs and TLVs shown are time-weighted average
concentrations.
“NIOSH REL” means National Institute for Occupation Safety and Health Recommended Exposure Limit.
“ACGIH TLV” means American Conference of Governmental Industrial Hygienists Threshold Limit Value. Note that some countries and provinces, such as The Ontario Ministry
of Labour reference the ACGIH TLV for CO as their occupational exposure limit.
2 These calculated ratios are based on the tailpipe emissions (see text). The ratio has been multiplied by 3 to account for the three carbons in each molecule of propane.
3 The air mixing factor, K, varies from 1 to 3, depending on the ef fi ciency of air mixing.
4 It is prudent to set the K factor at 3 for rooms with poor air mixing or where the equipment is used in one area for longer than usual, such as during stripping.
5 The dilution air recommendations are minimum outside air guidelines. Real-time personnel exposure monitoring should be performed using direct sensing CO monitors with
alarms in order to ensure that the
fl oor burnisher is adequately tuned and that suf fi cient dilution ventilation is being provided in all of the areas in which the burnisher will be used.
It would be advisable to consult an experienced occupational health & safety adviser, such as an industrial hygienist for special situations.
The dilution ventilation equation is:
Where:
Q
OA
= Volumetric fl ow rate for outside dilution air, in CFM
q = Generation rate for contaminant (CO), in CFM
OEL = Occupational Exposure Limit (see Table for PEL, TLV, etcetera)
K
eff
= A mixing factor to account for incomplete or poor delivery of dilution air (OA) to occupants. For example, a K
eff
value of 3.0 is consistent with a point source of contaminants
operated in crowded spaces with tight partitions, walls or barriers and poor air supply and return locations (AIHA, 2003). A K
eff
of 1.0 indicates ideal ventilation mixing ef fi ciency.
References
AIHA (2003) “General Methods for the Control of Airborne Hazards,” The Occupational Environment – Its Evaluation and Control, Second Edition, American Industrial Hygiene
Association, Fairfax, VA, pp. 829-846.
6 In some cases, it may be necessary to measure carbon dioxide (CO
2
) concentrations, especially if the background CO2 concentration already present in the room is expected to
be elevated prior to use of the burnisher.
7 See table below for model identi fi cation with and without Catalytic Convertor option:
Model 21KBCATCLST
Part Number
56381410
Catalytic Converter Yes
revised 3/11