ES&H Manual



6150 Compressed, Liquefied, and

Solidified Gas[1] Program



Jefferson Lab has determined that working with compressed, liquefied, and solidified gases carries an unmitigated Risk Code >2.  At a minimum all tasks requiring compressed, liquefied, and solidified gases are discussed with the supervisor prior to commencement.  An Operational Safety Procedure (OSP) is written for work considered to be Risk Code >2 in accordance with ES&H Manual Chapter 3210 Work Planning, Control, and Authorization Process.


1.0            Purpose


Compressed, liquefied, and solidified gas(es)1 are considered chemicals by Jefferson Lab and are subject to the requirements of the ES&H Manual Chapter 6610 Chemical Hygiene Program and its associated appendices.  This document, and its associated appendices, defines Jefferson Lab’s additional requirements related to gas.


Jefferson Lab bases the requirements for gas(es) on applicable federal, state, and local requirements listed in ES&H Manual Chapter 2410 Appendix T1 Hazard Issues List.


2.0            Scope


This chapter does not address the additional requirements assigned to gas(es) used in experiments (see ES&H Manual Supplement Use of Flammable Gases in Physics Experiments, ES&H Manual Chapter 3120 The CEBAF Experiment Review Process and/or ES&H Manual Chapter 3130 The FEL Experiment Review Process), nor the use of manifolds and gas distribution systems.  


NOTE:  Many gases pose an oxygen deficiency hazard (ODH).  At a minimum a current “ODH Safety Review” is required when an ODH source is introduced, increased, or recognized to be, in an area.  (See ES&H Manual Chapter 6540 Appendix T1 Oxygen Deficiency Hazard (ODH) Safety Review for more information.


If you suspect that you have been over-exposed to a gas, contact Occupational Medicine (ext 7539).  Confirmed reports of gas overexposure are investigated in accordance with ES&H Manual Chapter 5200 Event Investigation and Causal Analysis Process and its associated procedures.


Table 1: Required Safety Training by Job Classification

Training Course

Qualified Gas Worker

ODH Training



Fire Safety Training



*For Flammable Gases


3.0            Responsibilities

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


3.1              Qualified Gas Worker

·         Complete and maintain appropriate training and medical monitoring including:

o   SAF-103 Oxygen Deficient Hazards

o   For Flammable Gases: SAF 108 Fires Safety Training

·         Read and comply with safety precautions on the material safety data sheet (MSDS) and cylinder label.  Contact the MSDS Coordinator for clarification or assistance.

·         Be familiar with the signs of over-exposure and emergency treatment for the gas you work with.  Comply with recommended emergency and first aid procedures denoted on the MSDS.  If the MSDS is not available follow the procedures in ES&H Manual Chapter 6610 Appendix T6 Emergency Response to Chemical Over-Exposure.

·         Use and maintain personal protective equipment (PPE) appropriate for the work assigned.  (See ES&H Manual Chapter 6620 Personal Protective Equipment Program.)

·         Request a hazard evaluation be performed for gases stored and used in your area.

·         Know the locations and operation of fire extinguishers and pull station, emergency showers, and eyewash units in your area.

·         Ensure that appropriate administrative and engineering controls are working properly prior to commencement of activities.

·         Ensure that cylinders are labeled, stored, and moved, in accordance with the manufacturer’s recommendations and Jefferson Lab procedures.  

·         Do not use any cylinder that is damaged, leaking, or has illegible or otherwise unintelligible labels.  (Remove to an outdoor storage area and notify the Fire Protection Engineer.)

·         Order new or significantly changed gases using the procedure in ES&H Manual Chapter 6610 Appendix T2 Chemical Requisitioning and Procurement.  (Webstock may be used for gas that is ordered on a routine basis).


3.2              Supervisor/Subcontracting Officer’s Technical Representative (SOTR)/Sponsor

·         Ensure individuals under your authority, assigned to areas where gas is used/stored, are properly trained and authorized.

·         Ensure a current hazard evaluation has been performed for gases used/stored in your inventory.

·         Ensure that a current MSDS is available for all gases in your inventory in accordance with ES&H Manual Chapter 6610 Appendix T1 Material Safety Data Sheets.

·         Routinely inspect cylinders to ensure they are undamaged, stored properly, and appropriately labeled.  (Contact the Fire Protection Engineer/Industrial Hygiene for assistance.)

·         Ensure that appropriate ODH Safety Review/Risk Assessment, administrative controls, engineering controls, and emergency response procedures are in place prior to authorizing work.


3.2.1        SOTR also:

·         Require that subcontractors submit a Task Hazard Analysis that includes handling, storage, use, and disposal procedures including removal of cylinders/dewar after work has been completed. 

·         Ensure that the subcontractor submits MSDS(s) to the MSDS Coordinator or maintains it on site in compliance with ES&H Manual Chapter 6610 Appendix T1 Material Safety Data Sheets.


3.3              Industrial Hygiene

·         Perform hazard evaluations and approve areas for specific gas use and storage, as requested.

·         Provide safety labels and signs, as required/requested.


3.4              Material Data Safety Sheet (MSDS) Coordinator

·         Perform annual gas inventories.  Ensure:

o   MSDSs are available;

o   Cylinders are labeled; and

o   Proper storage is utilized.


3.5              Safety Warden

·         Check cylinders and piping systems during monthly inspections to ensure that they are un-damaged, stored properly, and appropriately labeled.  (Submit a Facilities Management Work Request to rectify non-compliance.)


4.0            Expectations


4.1              Hazard Categories

Gases are divided into hazard categories according their characteristics and likely reactions to other materials.  ES&H Manual Chapter 6150 Appendix T1 Gas Hazard Categories and Safety Requirements provides the hazard categories and minimum safety requirements for gases used at Jefferson Lab. 


4.2              Cylinder Movement

Jefferson Lab recognizes the inherent risks of moving compressed, liquefied, or solidified gas cylinders, tanks, and dewars (cylinders) from a storage area to a work location.  ES&H Manual Chapter 6150 Appendix T2 Moving Gas Cylinders from Storage to Work Area provides Jefferson Lab’s minimum requirements to perform this operation.  Only Qualified Gas Workers, trained in accordance with these safety requirements, are authorized to perform these process steps. 


NOTE:  Transporting gas from one building or location to another, in or on a motorized vehicles, is considered a Risk Code >2 and is performed with supervisor approval and in accordance with the procedure outlined in ES&H Manual Chapter 6660 Appendix T1 Transport of Hazardous Material.


4.3              Labeling

Gas cylinders used at Jefferson Lab are labeled in accordance with federal, state, and local requirements and industry standards.  ES&H Manual Chapter 6150 Appendix T3 Gas Cylinder Labeling describes Jefferson Lab’s minimum requirement for labeling of cylinders.


4.4              Flammable Gases used in Physics Experiments

The use of flammable gases used in physics experiments may present unique requirements.   Special review and consideration is provided by the Physics Division Experimental ESH&Q Review Committee (E2RC) or by an independent reviewer appointed by the committee.  Requirements are outlined within the ES&H Manual Supplement Use of Flammable Gases in Physics Experiments.


5.0            References


29 CFR 1910 Occupational Safety and Health Standards

Compressed Gas Association (CGA) See specific chapters related to the gas


6.0            Revision Summary


Revision 1.1 – 05/20/14 – Added Required Safety Training Table.

Revision 1 – 06/15/11 – Updated to reflect current laboratory operations. 

  Moved ES&H Manual Chapter 6152 Storage/Use of Flammable Gases and associated appendices to the ES&H Manual Supplement Use of Flammable Gases in Physics Experiments.












ESH&Q Division

Tim Minga

June 15, 2011

June 15, 2016



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 5/16/2014.

[1] For the purpose of this chapter the term “gas” is used, in its singular or plural form, to mean compressed, liquefied, and/or solidified gas.