Nilfisk PBU 56381410 Manuel D'utilisation page 7

MINIMUM RECOMMENDED DILUTION VENTILATION RATES FOR CARBON MONOXIDE EXPOSURE CONTROL
PROPANE-POWERED PBU FLOOR BURNISHER NILFISK-ADVANCE, INC.
Propane Fuel
Machine & Environment
Consumption
See note 7
Machines without catalytic
converter; Moderate air
mixing
Machines with catalytic
converter; Moderate air
mixing
Machines without catalytic
converter; Poor air mixing
Machines with catalytic
converter; Poor air mixing
Notes:
1 Abbreviations:
"CO" means carbon monoxide
"CO " means carbon dioxide
2
"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 effi 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 suffi 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 = Volumetric fl ow rate for outside dilution air, in CFM
OA
q = Generation rate for contaminant (CO), in CFM
OEL = Occupational Exposure Limit (see Table for PEL, TLV, etcetera)
K = A mixing factor to account for incomplete or poor delivery of dilution air (OA) to occupants. For example, a K
eff
operated in crowded spaces with tight partitions, walls or barriers and poor air supply and return locations (AIHA, 2003). A K
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
be elevated prior to use of the burnisher.
7 See table below for model identifi cation with and without Catalytic Convertor option:
Model
Part Number
Catalytic Converter
revised 3/11
Calculated Air Mixing
CO
Generation (see Notes 3
(lbs/hour)
Rate (CFM)
3.65 0.304
3.65 0.216
3.65 0.304
3.65 0.216
) concentrations, especially if the background CO2 concentration already present in the room is expected to
2
21KBCATCLST
56381410
Yes
Dilution Ventilation Requirement, CFM (see Note 5)
Federal NIOSH
Factor K
OSHA PEL REL (35
(50 ppm CO) ppm CO)
and 4)
1.5 326 465
1.5 232 331
3.0 651 930
3.0 463 662
FORM NO. 56091024 - PBU Propane Stripper - A-7
ENGLISH / A-7
Minnesota
OSHA PEL ACGIH TLV (25
(35 ppm ppm CO)
CO)
465 651
331 463
930 1302
662 926
value of 3.0 is consistent with a point source of contaminants
eff
of 1.0 indicates ideal ventilation mixing effi ciency.
eff
Comment
See Notes
4 & 5
See Notes
4 & 5
See Notes
4 & 5
See Notes
4 & 5