ES&H Manual



6540 Appendix T1

Oxygen Deficiency Hazard (ODH) Safety Review



Jefferson Lab has determined that working within an ODH area that has not been subjected to a Safety Review carries an unmitigated Risk Code >2. An ODH area that has been reviewed and identified control measures have been instituted is considered mitigated to a RC <2. It does not requiring an OSP. An Operational Safety Procedure (OSP) is required when any work is considered to be a Risk Code >2 in accordance with ES&H Manual Chapter 3210 Work Planning, Control, and Authorization Process.


1.0            Purpose


An Oxygen Deficiency Hazard (ODH) Safety Review is performed when gas is proposed, switched, or discovered in a process or an area; or as requested in accordance with ES&H Manual Chapter 3210 Work Planning, Control, and Authorization Process. Relevant factors include, but are not limited to:


·         Volume of the area.

·         Potential volume of the gas.

·         Work to be performed in the area.

·         Engineering controls currently in place.

·         Required administrative controls.

·         Existing ODH sources or installations.


This appendix provides instructions on how to complete an ODH Safety Review Form so an accurate determination of risk can be made and appropriate mitigation can be implemented.


2.0            Scope


The ODH Safety Review Form is to be filled out for any area before an ODH is introduced, or when it is recognized, including, but not limited to: fixed sources, and permanently installed equipment. This form is also used to assist in identifying areas that have the potential to become oxygen deficient. 


The process steps for this procedure are performed in coordination with ES&H Manual Chapter 6540 Oxygen Deficiency Hazard Control Program.


3.0            Responsibilities

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


3.1              Anyone at Jefferson Lab

·         Complete the ODH Safety Review Form prior to introducing, or altering ODHs, or as requested for your work area.


3.2              ODH Safety Reviewer

·         Review and, if acceptable, approve ODH Safety Review document(s). 

·         Submit request for a Facility Design Review or ODH Risk Assessment as appropriate.

·         Designate the appropriate ODH classification for an area.

·         Verify ODH equipment safeguards, inventory requirements, posting, and labeling, are in-place prior to introduction of the ODH.


3.3              ODH Analysis Authority

·         Conduct ODH Risk Assessments when requested.

·         Qualifications include:

o   Demonstrated ability to analyze and mitigate oxygen deficiency hazards within laboratory user systems. 

o   Maintain appropriate training SAF103 Oxygen Deficiency Hazard   

o   Technical proficiencies and knowledge of: 

§  ODH evaluations, calculations, design/implementation of control measures, 

§  common compressed and liquefied gases,  mixed gas properties, 

§  ODH propagation calculations, 

§  29 CFR 1910.146 Permit Required Confined Spaces

§  Pressurized gas mechanical systems with their associated failure modes analysis. 

o   One of the following:

§  Completion of an engineering or physics degree, requiring four or more years of full time study, plus a minimum of five years experience relating to the technical requirements listed above.

§  Professional Engineering registration, recognized by the local jurisdiction, plus experience in systems relating to ODH classification, mitigation, evaluation, and their properties.

§  Jefferson Lab’s Engineering Manager approval with concurrence from the Senior Cryogenic Coordinator for Accelerator Operations.


4.0            ODH Safety Review              


4.1              Part 1 – Preliminary Analysis: Using the ODH Safety Review Form, fill in all information requested.


Step 1:             Introduction

·        Task Title: Brief description of work.

·        Task Number: As applicable per department procedures.

·        Location, Specify building, room, or area and contiguous areas and relative position within the building or larger area.

·        Effective Date: Date which the ODH will be introduced (not necessarily the date the form is approved).

·        Expiration Date: Date by which the area must be re-assessed or hazard will no longer apply (not to exceed three years).

·        Document /Division/Department Owner: Print name of person responsible for the work, their division/department.


Step 2:             Preliminary Information

·        Gas(es) to be Introduced: List the name and source concentration of the gas(es). Denote any additional hazard issues that may be of concern.

·        Denote Hazard Category (See ES&H Manual Chapter 6150 Compressed Gases)

·        Denote if gas is self-contained? (In a Dewar or similar?)

·        Attach copies of any related “Oxygen Deficiency Hazard Risk Assessments” for the building and any additional supporting documents/calculations.


Step 3:             Room Floor Plan

Attach a Room Floor Plan denoting the location of the ODH.  (See Facilities Management and Logistics “List of Facilities - Floor Plan Highlighted by Room Standard” for square footage.)


Step 4:             Preliminary ODH Calculation

Depending on the location of your source, complete the appropriate column:




Source is located inside the proposed ODH area


21(VR – VG)



Source is located OUTSIDE the proposed ODH area


21(VR – Q)   *



VR = the total volume of the room in cubic feet

VG = the volume of gas at room temperature and pressure in cubic feet

Q = Volumetric flow rate of gas into room at room temperature and pressure in cubic feet per hour  (Contact Engineering if you require assistance)

* Assuming one fresh air change per hour (ACH).  If more than one ACH is needed additional review may be required.



If Resulting % Oxygen is:



Continue to 4.2 Part Two – Additional Information.  Then submit form to ODH Safety (see Section 4.3 Submittal below). 


Submit form to ODH Safety Reviewer (see Section 4.3 Submittal below).

(If resulting % oxygen is between 18 and 19.5 a second

ODH Safety Reviewer approval is required.)


4.2              Part 2 – Additional Information


Step 1:             Include:

·         Engineering Controls: List those that are:

o   Already in place (e.g. fume hoods, valves, critical orifices), and

o   Planned.  (Attach additional sheets as necessary)

·         Administrative Controls: including but not limited to:

o   Training,

o   Standard Protecting Measures,

o   Work Control Documents

·         Attachments: Provide all attachments; include e-mail confirmations, document numbers, etc. so that your data can be verified.


Step 2:             Submittal - Go to 4.3 Submittal


4.3              Submittal


Step 1:             Submit the completed form – performed by the Document Owner

·         Submit form to ODH Safety Reviewer for ODH designation and approval.


Step 2:             Review the completed form – performed by the ODH Safety Reviewer


§  Denote ODH designation,

§  Provide approval signature, and

§  Return the form to Document Owner.




·         If between 18% and 19.5% oxygen (or other concern is found)

§  Denote ODH designation,

§  Provide approval signature,

§  Obtain a second ODH Safety Reviewer signature, and

§  Return the form to Document Owner.




·         If Unacceptable (<18% oxygen or other concern is found)

o   Arrange for an ODH Risk Assessment. 


NOTE: Forward completed ODH Risk Assessments to ODH Safety Reviewer for appropriate filing and distribution.


Step 3:             Mitigation Actions: performed by Document Owner

·         Ensure required mitigation measures are installed/in-place (re-submit form to ODH Safety Reviewer for approval if necessary).

·         Obtain additional review and final approval signatures per department procedures.


4.4              Distribution: 

Upon final approval the Document Owner makes the following distributions:

·         Original: to be appropriately posted in accordance with department procedures.

·         Copies to: affected area and ESH&Q Document Control.


5.0            ODH Safety Review Flowchart


6.0            Revision Summary


Revision 1.1 – 06/22/16 – Updated TPOC from D.Owen to J.Williams

Revision 1.0 – 01/17/12 – Updated to reflect current laboratory operations.











ESH&Q Division

Jennifer Williams





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 7/27/2016.