TITLE:

ES&H Manual

 

DOCUMENT ID:

6630 Appendix T1

Engineering Controls –

Fixed and Portable Exhaust Ventilation

 

 

1.0          Purpose

 

Whenever respiratory hazards cannot feasibly be mitigated through material substitution, engineering controls (in the form of fixed and/or portable exhaust ventilation) are the preferred methods.  This appendix provides how to determine if engineering controls are required; appropriate use parameters; and repair, maintenance, and inspection schedules.  

 

2.0          Scope

 

This appendix covers fixed and portable exhaust ventilation available at Jefferson Lab.  Table 1 provides the minimum capture velocities required to mitigate a hazard for a typical condition, and the contaminant velocity.  (These are representative conditions found at Jefferson Lab, other conditions may apply.  Contact Industrial Hygiene if there is concern regarding your specific condition.) 

 

Table 1 - Fixed and Portable Exhaust

Condition Examples

Contaminant Velocity

Minimum Capture Velocity

(feet per minute)

Vapors from degreasing, or soldering

No significant velocity

50–100

Spray paint booths, welding, solvent, and acid work

Low initial velocity

100–200

Spray painting into shallow booths, container filling, and crushing

Significant velocity

200–500

Grinding, and abrasive-blasting

High velocity

500–2000

 

This appendix is written in coordination with ES&H Manual Chapter 6630 Respiratory Protection Program.  All applicable content within the chapter applies to the process steps outlined in this appendix.

 

3.0          Responsibilities

NOTE:     Management authority may be delegated at the discretion of the responsible manager.

 

3.1            Anyone at Jefferson Lab

·       Request an equipment/area hazard evaluation from Industrial Hygiene if you have concerns regarding air quality.

·       Use exhaust ventilation in accordance with intended condition.

·       Submit a Facilities Management Work Request when equipment is not performing up to standards.

 

3.2            Facilities Management

·       Repair exhaust ventilation as requested and maintain per manufacturer’s recommendations.

·       Contact Industrial Hygiene when repair/maintenance activities have been performed.

 

3.3            Industrial Hygiene

·       Recommend appropriate mitigation (including material substitution) for respiratory hazards in accordance with findings from the hazard evaluation.

·       Perform and record exhaust ventilation inspections.

 

4.0          Process Steps

 

Figure 1 - Exhaust Ventilation Determination Process

 

 

 

 

 

4.1            Determining Need

 

In accordance with your Task Hazard Analysis, request a hazard evaluation for the work condition.  When mitigation method is determined follow the applicable instructions detailed in Table 2.

 

Table 2 - Instructions per Mitigation Method

IF

THEN

Material Substitution

Substitute material, and continue work.

Fixed Exhaust Ventilation Required*

(e.g., chemical fume hood, capture hood, stud hood)

Submit a Facilities Management Work Request.

(See ES&H Manual Chapter 3110 Facilities Design Review).

Portable Exhaust Ventilation Required

(e.g., smoke eaters, HEPA vacuums)

Obtain system training, and continue work.

*All fixed exhaust units are installed by Facilities Management.

 

4.2            Use of Fixed Exhaust Ventilation

 

4.2.1       Prior to use:

·       Read and abide by the manufacturer’s instructions.

·       Ensure air flow is adequate for the condition.

·       Read the Inspection Label (Figure 2):

o   Ensure inspection is valid (within one year of previous inspection).  (Contact Industrial Hygiene if out of date.)

o   Set work up to abide by:

§  appropriate sash height

§  working capture distances

 

Figure 2 - Example Fume Hood Inspection Label

Chemical Fume Hood Inspection Label

 

4.2.2       During use:

Abide by the following controls outlined in Table 3.

 

Table 3 – Fixed Exhaust Ventilation Controls

Parameter

Control

Face velocity

·        Maintain appropriate sash height or working capture distances.   

·        Maintain the hood sash at the smallest practicable open area. 

·        Use the sash as a protective shield.

Cross drafts

Position material to minimize cross drafts. 

Turbulence and/or Dead Spots

Minimize by:

·        Regulating face velocity

·        Placing items at least 6-inches from the opening.

·        Raising bulky objects off the work surface.

Capture velocity

100% capture is required.

Storage

Hoods are not to be used for:

·        Routine storage or

·        Evaporation of spent chemicals.

Body Positioning

Keep head and body out of the pathway between contaminant/condition and capture.

Personal Protective Equipment

Dependent on condition.  See ES&H Manual Chapter 6620 Personal Protective Equipment Program for more information.

 

NOTE:

If at any time your exhaust ventilation is not functioning adequately:

·     Discontinue use.

·     Submit a Facilities Management Work Request for repair or maintenance.

·     After repairs have been made, contact Industrial Hygiene to ensure adequate air flow.

 

4.2.3       Inspection:

Industrial Hygiene performs the following inspections on exhaust ventilation:

·       Before initial start-up;

·       Annually thereafter;

·       After any adjustment, modification, or maintenance.

 

Requirements based on inspection results are outlined in Table 4 below:

 

Table 4 – Fixed Exhaust Inspection Findings

If the Hood

Then

Passes inspection

·        An appropriate hood inspection label is provided.

Does not pass inspection

·        The hood is placed out of service.

·        A Facilities Management Work Request is submitted.

·        Another inspection is scheduled after repair of unit.

 

4.3            Use of Portable Exhaust Ventilation (HEPA Vacuum/Smoke Eater):

 

4.3.1       Prior to use:

·       Obtain HEPA vacuum/smoke eater from IH.

·       Select HEPA vacuum/smoke eater appropriate for task (seek assistance from IH for selection)

o   Lead vacuums

o   Particulate vacuum (general dusts & silica)

o   Smoke eaters (selection based on type of welding/grinding)

·       Read the Inspection Label (Figure 3):

o   Ensure inspection is valid (within one year of previous inspection).  (Contact Industrial Hygiene if out of date.)

o   Set work up to abide by:

§  appropriate sash height

§  working capture distances

 

Figure 3 - Example HEPA Vacuum / Smoke Eater Inspection Labels

HEPA Vacuum Certification Label

 

Inspection Label on Smoke Eater

 

4.3.2       During use (HEPA vacuums):

·       Operate vacuum directly onto surface cleaning or point of dust capture.

·       Do not open collection bag or HEPA filter (return to IH for maintenance).

·       If dropped, do not use.  Return unit to IH.

·       Store HEPA vacuum parts (power cord, hoses, etc.) as appropriate for vacuum.

·       Return HEPA vacuum to IH when work is complete.

·       NOTE: IH HEPA vacuum should not be used in Radiation Controlled Areas without RADCON approval.  Contact RADCON for assistance.

 

4.3.3       During use (smoke eaters):

Abide by the following controls outlined in Table 5.

 

Table 5 - Portable Exhaust Ventilation Controls

Parameter

Control

Face Velocity

Maintain appropriate working capture distances.

Cross Drafts

Position material to minimize cross drafts. 

Turbulence and/or Dead Spots

Minimize by:

·        Regulating face velocity.

·        Raising bulky objects off the work surface.

Capture Velocity

100% capture is required.

Body Positioning

Keep head and body out of the pathway between contaminant/condition and capture.

Personal Protective Equipment

Dependent on condition.  See ES&H Manual Chapter 6620 Personal Protective Equipment Program for more information.

 

5.0          Reference(s):

 

·       Industrial Ventilation, A Manual of Recommended Practice – 26th edition

 

6.0          Revision Summary

 

Revision 1.1  09/04/13  Periodic Review – Changed title to reflect content; updated flowchart; added examples to mitigation methods; added new process steps for HEPA vacuums/smoke eaters per JWilliams.

Revision 1.0  08/11/11  Updated to reflect current laboratory operations.

 

 

ISSUING AUTHORITY

TECHNICAL POINT-OF-CONTACT

APPROVAL DATE

REVIEW REQUIRED DATE

(Annual Review Required)

REV.

 

 

ESH&Q Division

Jennifer Williams

08/11/11

09/04/14

1.1

 

This document is controlled as an on line file.  It may be printed but the print copy is not a controlled document.  It is the user’s responsibility to ensure that the document is the same revision as the current on line file.  This copy was printed on 3/6/2014.