Laboratory Ventilation. Environmental, Health, and Safety

Transcription

1 No.: BCF Page: 1 of 7 RECORD OF REVISIONS Date Rev # Details of Change 09/13 1 Updated job titles to reflect ICON job descriptions. Added a definition for Approved Ventilation Contractor and included procedures for using third party ventilation contractors/consultants to perform lab hood inspections. Added Attachment A List of Approved Ventilation Contractors. Alphabetized the list of definitions. Added the prohibited uses of recirculation hoods. Added a reference to BASF N-S-CL 203, Ventilation Design Guidelines. 05/09 0 Reformatted and updated the terminology in Industrial Hygiene #5 (IH #5 ) and changed it to BCF Changed the old SCOPE section to the new PURPOSE section. Section 5.3.2: Hood inspection frequency changed from even numbered years to annually.

2 No.: BCF Page: 2 of 7 1. PURPOSE The purpose of this standard is to ensure laboratory personnel are protected from exposure to potentially hazardous air contaminants and to reduce the potential for fire and explosion hazards due to laboratory use of flammable or combustible materials. 2. SCOPE This standard applies to the BASF. 3. DEFINITIONS 3.1 Approved Ventilation Contractor A third party company approved by the Texas EHS Hub to measure and observe laboratory hood performance and certify that laboratory hoods comply with this site standard. Approved ventilation contractors are listed in Attachment A. 3.2 Auxiliary Air Hood Laboratory hood with an integrated make-up air system. 3.3 Canopy hood A local exhaust ventilation system that is designed to capture vapors that naturally rise due to convection. A kitchen range hood is an example of a canopy type hood.

3 No.: BCF Page: 3 of Face Velocity The linear velocity of the air at the point where the hood opens into the laboratory. Generally measured at the sash. 3.5 Hood Inspection Label The following label, indicating maximum sash height and inspection year, that is affixed to all inspected laboratory hoods. This label may be substituted by an approved ventilation contractor s label as long as the contractor s label indicates the sash height required to achieve 100 fpm and the due date of the next inspection. THIS FUME HOOD WILL EXHAUST AT THE RATE OF 100 LINEAR FEET PER MINUTE WHEN WINDOW IS AT THE LEVEL INDICATED BY ARROW SASH INCHES INCHES OF H2O 100 FPM INSPECTED BY NEXT INSPECTION 3.6 Laboratory Fume Hood A local exhaust ventilation system which is specifically designed for containing potential hazards generated from laboratory experiments. The hood must be of the enclosing type (box) with the maximum enclosure as possible. A canopy hood is not considered a laboratory fume hood.

4 No.: BCF Page: 4 of 7 EXHAUST DUCT VERTICALLY MOVEABLE SASH BY-PASS AIR INLET BAFFLES 3.7 Make-up Air Air introduced to a laboratory through conventional HVAC systems to replace air exhausted by laboratory fume hoods. 3.8 Manometer An instrument for measuring pressure; essentially a "U" tube partially filled with liquid, constructed so that the amount of displacement of the liquid indicates the pressure being exerted on the instrument. Manometer measurements should be taken at least three duct diameters distance from duct/hood junctions. 3.9 Recirculation Reintroduction of exhausted air into the work place Recirculation Hood (or Ductless Hood) Hood with an integrated filtration system specifically designed to remove potential air contaminants generated in the hood. 4. RESPONSIBILITIES 4.1 It is the responsibility of the Texas EHS Hub to: 1. Audit department compliance to the requirements of this standard. 2. Approve design specifications for all new laboratory hood installations.

5 No.: BCF Page: 5 of 7 3. Inspect all laboratory hoods per the inspection requirements of this standard or approve third party ventilation contractors/consultants to perform the inspections. 4. Maintain a list of Approved Ventilation Contractors (Attachment A). 4.2 It is the responsibility of the Production Execution Manager, Site Utilities/Infrastructure Asset Manager, Power Distribution Manager, Site & Area Logistics Manager, Lab Manager and project engineers to ensure that Texas Hub EHS is consulted on all new laboratory hood installations and to ensure that new installations adhere to the design specifications approved by Texas Hub EHS. 4.3 It is the responsibility of PDQA Lab Managers to ensure laboratory ventilation systems are maintained at optimum efficiency. 5. PROCEDURE 5.1 The following design specifications must be met when installing laboratory ventilation systems: 1. Hoods shall be located where cross currents from HVAC supply vents, doors, windows, and pedestrian walkways are minimal. 2. Materials of construction must address: Corrosion resistance Chemical compatibility Chemical absorption Use with flammable or combustible materials 3. Interior work surface shall be designed to contain spills within the hood. 4. An adequate volume of conditioned make-up air (4-12 room volumes/hour based on Texas EHS Hub s evaluation of chemical toxicity and nuisance potential) must be supplied, via the laboratories HVAC system, to permit hoods to operate at their designed exhaust rates and to maximize fan efficiency. 5. Use of recirculation hoods is prohibited unless the Texas EHS Hub approves this type of hood for a particular application. The following hazard categories and classifications as defined in OSHA 29 CFR Hazard Communication Appendix A are always prohibited and may never be used in a recirculation hood. Other chemical substances with hazards not specifically listed below may also be prohibited as determined by the Texas EHS Hub: Substances with an acute toxicity hazard category of 1 or 2, by inhalation. Respiratory sensitizers

6 No.: BCF Page: 6 of 7 Category 1 carcinogens Category 1 mutagens Category 1 reproductive toxicants Category 1 or 2 substances with target organ toxicity, by inhalation Substances with odor thresholds that are higher than the BASF occupational exposure limit. 6. Installation of auxiliary air hoods is prohibited unless the Texas EHS Hub approves this type of hood for a particular application. 7. Installation of canopy hoods is prohibited unless the Texas EHS Hub approves this type of hood for a particular application. 8. Laboratory hoods must also comply with the applicable sections of BASF N-S- CL 203, Ventilation Design Guidelines. 9. Hood exhaust fans must be located on the exterior of the building and as close to the exhaust discharge as possible, unless the Texas EHS Hub approves a different configuration. Fan discharge stacks must be positioned away from building HVAC system intakes to prevent recirculation. Dispersion modeling may be necessary to assess the potential for recirculation of toxic chemicals into building ventilation systems. 10. Hoods must be equipped with a transparent, easily movable sash that can substantially close off the hood face. 11. All electrical outlets and panel mounted electrical controls must be mounted on the exterior of the hood. 12. All hoods must be equipped with automatic control systems with alarms, permanent manometer or other continuous flow indicating device (i.e. Magnehelic gauge, anemometer, etc.). 13. All laboratory ventilation systems must be designed and installed in accordance with consultation from the Texas EHS Hub, and must satisfy all applicable ASHRAE and NFPA standards and guidelines. 14. All hoods must be designed to have a maximum noise level of 65 dba at a distance of three feet from the hood face. 15. All hoods must be designed to maintain an average face velocity of 100 feet per minute with the sash fully open, unless a specific OSHA specifies a different face velocity. 16. All laboratories must be designed in a manner which ensures clean make-up air enters the occupied area at non-exposure locations (i.e. offices & desk areas) and exits through the areas where exposure potential is higher. 5.2 The following procedures shall be followed when using or operating laboratory hoods:

7 No.: BCF Page: 7 of 7 1. Laboratory hoods must not be used for storage of corrosive, toxic, or flammable materials which may block air flow and compromise hood performance or create unnecessary hazards. 2. Operators must verify that the exhaust system is operating prior to using any hood. 3. The sash should be lowered as much as possible when using any hood, to provide maximum hood efficiency. 4. Hoods must not be operated with sash raised above the level indicated by the Hood Inspection Label. 5. The sash should be closed when no-one is working at the face of the hood. 5.3 Laboratory hoods shall be inspected as follows: 6. ATTACHMENTS 1. The Texas EHS Hub or an Approved Ventilation Contractor shall inspect all newly installed hoods to determine the proper maximum sash height, and will attach to the hood a Hood Inspection Label indicating the maximum sash height and the year of the next inspection. 2. Annually, the Texas EHS Hub or an Approved Ventilation Contractor shall measure the face velocity of all existing hoods to determine the proper maximum sash height, visually inspect the operation of the manometer or automatic control system, and will attach to the hood a Hood Inspection Label indicating the maximum sash height, the manometer reading at the maximum sash height, and the year of the next inspection. 3. Laboratory Team Leaders / Managers shall routinely monitor the readout of hood manometer or automatic control system to verify that the hood is operating efficiently. Deviations in readouts of 25% from the normal operating range indicates a change in efficiency and warrants investigation and/or maintenance. 4. Laboratory Team Leader/Manager shall routinely inspect the condition of hood enclosure, duct work, fan belt, and fan, to ensure that the hood operates at maximum efficiency. 5. All hoods that have been modified, decommissioned, or repaired, must be reinspected by the Texas EHS Hub or an Approved Ventilation Contractor prior to recommissioning. BCF Attachment A List of Approved Ventilation Contractors