DCASE - Unit 7 - Gas Free Engineering

• Detect OET.
• 1. Oxygen (19.5%<O2<22%)
• 2. Explosives (<10% LEL)
• 3. Toxins (Above NIOSH IDLH levels)

Upon reporting and annually thereafter.

Toxic Gas Bill

• 1. To ensure a safe working and living environment for the crew
• 2. To provide an all hands hazard awareness training program

• 1. Annually
• 2. Safety Officer

• 1. Annual Verification of CPR
• 2. Emergency Rescue Drill & Documented
• 3. Engaged in GFE During the Year Issued 10 Certificates.
•     a. If Above Has Not Been Satisfied, Complete 5 Gas Free Evolutions Under Supervision of a Certified GFE.
•     b. If Above Is Not Possible, Complete an Oral/Written Exam & a Practical Exercise.

• 1. Graduated Formal School Within 36 months of reporting.
• 2. Unit does not have a qualified GFE aboard.
• 3. Service member is a USCG Engineering Petty Officer.

• 1. Original - Gas Free Log (Retain 1 year)
• 2. OOD (QD or Bridge)
• 3. All accesses to the space
• 4. Division Requesting the Service
• 5. DC Central

• 1. 19.5% < O2 < 22 .0%
• 2. Toxins less than PEL
• 3. All Flammables removed (LEL = 0)
• 4. All boundary spaces protected

• 1. 8 hours
• 2. Two times for 8 hours each

• 1. Gas freeing IDLH space
• 2. Gas freeing for civilian contractors
• 3. Gas freeing for foreigner overseas
• 4. Hot Work adjacent to Magazines (never above or within 5 feet)

• 1. Oxygen deficient or rich
• 2. IDLH Atmosphere
• 3. Danger of Fire or Explosion in Presence of Hotwork

• 1. Provides provisional entry into space.
• 2. Toxics exceed PEL or Unity, but less than IDLH
• 3. Explosives >0% and <10%
• 4. Hot work prohibited or not requested

Note: Hot work is prohibited in the space or in the boundary spaces for which a provisional certificate is issued.

• 1. Toxics below PEL
• 2. Sufficient oxygen
• 3. Danger of explosion or excessive toxicants in presence of hot work or hot work not requested

• 1. Pressed up or Inerted
• 2. This is an emergency procedure and not one used routinely

• 1. Extreme emergency (failure to perform GFE services would increase liability).
• 2. CO permission is required.

• 1. For QA (CO retains right to have S/F conduct gas free regardless).
• 2. When in a private shipyard (IAW MOA).

• 1. Outside US Waters.
• 2. No Shore Maritime GFE available.
• 3. No local Competent Person available.

• 1. Both GFE and Contractor will independently gas free the space
• 2. GFE will inform contractor of his findings
• 3. GFE will inform contractor that he retains legal obligation for the safety of contractor personnel in the space

• 1. To conduct Assessments
• 2. To conduct Inspections
• 3. To develop Repair Work Packages

• 1. Air Purifying
• 2. Supplied Air

NSTM 077

NAVOSH Manual (5100.19E)

• 1. No flammables present or being generated
• 2. No toxics present or being generated
• 3. Only to provide clean air for breathing and comfort

One complete air change in three minutes.

• 1. Source of Make-Up air is too close to exhaust inlet ducting.
• 2. Place the trunk further into the space.

Class I: High Energy Sparks

35 ft

4 inches

Maintain 5 Ft Boundary Away from Magazine Bulkheads

• 1. Smoking lamp out
• 2. 200’ exclusion zone
• 3. PPE
• 4. Safety observer
• 5. Non-spark producing tools
• 6. Continuous ventilation
• 7. SAR

Dry Nitrogen

• 1. Hot or Cold Water Wash
• 2. Steam Cleaning
• 3. Butterworthing / Wheelerizing
• 4. Chemical Cleaning
• 5. Biological Cleaning

The GFE

• 1. Continue to ventilate until space is clear.
• 2. Secure ventilation then let the air settle for 10 minutes.
• 3. Test the atmosphere (re-ventilate as needed).

NSTM 593 - Pollution Control

• 1. In an Emergency.
• 2. CO permission.

When the GFE/GFEA orders entry.

• 1. One Investigator
• 2. One Rescuer

• 1. CAB'S (Circulatory, Airway, Breathing)
• 2. Control Bleeding
• 3. Treat for Shock
• 4. Treat Broken Bones
• 5. Transport to Medical

• 1. All accesses to the space.
• 2. GFE Files (Original copy).
• 3. Division Requesting Services.
• 4. OOD (Quarterdeck or Bridge).
• 5. DC Central.

Note: Original must be kept for 1 year.

• 1. 1 per Ship
• 2. E-7 or Above
• 3. CO’s Designation Letter
• 4. Annual CPR Verification
• 5. Formal School
• 6. 40 Hours Practical Work U/I (waiverable)

• 1. 1 per Ship
• 2. E-6 or Above
• 3. CO’s Designation Letter
• 4. Annual CPR Verification
• 5. Formal School

• 1. 1 per IET (minimum)
• 2. E-4 or above
• 3. CO’s Designation Letter
• 4. Annual CPR Verification
• 5. Formal School
• 6. PQS (NAVEDTRA 43704, 316)

Minimum temperature at which self sustained combustion occurs without an external ignition source.

Temperature at which sufficient vapors are released to support continuous combustion once ignited.

Minimum temperature at which sufficient vapors are released to form an ignitable mixture.

• 1. Remove any/all ammunition prior to Availability or Overhaul.
• 2. No hot work in any space containing ammunition.
• 3. CO must approve in writing any hot work in adjacent spaces.
• 4. Apply 5 foot rule for adjacent spaces.

If there is more than one toxicant product in a space undergoing testing, the cumulative effects of the two or more products may be above unity, even though the PELs for any one of the products has not been exceeded.

Pollution Control (Sec 4, Sewage)

Preservation of Ships in Service (Sec 2. Safety Information)

Ammunition Afloat (Ch 2, General Regulations)

• 1. Considered IDLH due to exceptional risk of fire.
• 2. Greater than 22%

• 1. Considered IDLH by OSHA due to lack of coordination, perception, and judgement.
• 2. Less than 19.5%.

National Institute for Safety and Health tests and approves respiratory equipment and recommends toxicity exposure limits to OSHA.

Supplied Air Respirator (SAR) w/15 min backup air (SCBA).

Respiratory protection is mandatory (filter type respirator or supplied air respirator as appropriate).

Respiratory protection is optional.

• 1. Chemical
• 2. Butterworthing
• 3. Steam
• 4. Water Wash
• 5. Biological

• 1. Temperature may not exceed 230 deg F.
• 2. Apply 50 or 150 PSI steam for a period of 24 hours through a tank top connection.
• 3. Used to steam out MOGAS tanks.
• 4. May NOT be used in plastic or epoxy coated tanks (e.g. JP-5).

• 1. Use CO2 (heavier than air) or N2 (lighter than air and preferred medium) to maintain <1% O2 concentration.
• 2. Work outside of the space shall be certified and maintained as "Safe for Hot Work"
• 3. Upon completion of work, dispose of displaced vapor and inerting medium safely.

• 1. 5 SCBA's: 2 PASP's, 5 RASP's with 55 min of air per PASP (1 bottle).
• 2. 4 safety harnesses and safety lines
• 3. 2 radios or 3 SP Phones with salt and pepper lines on scene.
• 4. First aid kit and stretcher
• 5. Chain fall
• 6. Detection equipment
• 7. Explosion proof lighting, flashlight, drop lights, or chem lights.
• 8. Additional PPE as required.

• 1. Longer stay time
• 2. 15 minute Back-up air supply
• 3. Ease in Rescue
• 4. Ease in Egress

• 1. One Investigator
• 2. One Rescuer

Conducts initial contact, assessment, & safe removal.

Investigator has the comms.

• 1. GFE determines the number
• 2. 2+1 minimum size
• 3. Don respiratory equipment and stand by to provide assistance to the Primary Rescue Team.

• 1. One per rescuer.
• 2. Helps to don gear.
• 3. Tends safety line and chain fall.
• 4. Tends SAR/SCBA air hoses.
• 5. Maintains comms with the space.

• 1. Insert unbroken tube.
• 2. Squeeze bellows.
• 3. Wait 30 minutes.
• 4. Chain should still have slack.
• 5. Read instruction sheet.
• 6. Break off both ends of the tube.
• 7. Insert tube with the arrow pointing to the pump.
• 8. Squeeze bellows required number of times (Indicated by N= on the tube).
• 9. Determine readings.

• 1. Gas freeing an IDLH space.
• 2. Gas freeing for civilian contractors.
• 3. Gas freeing for a foreigner overseas.
• 4. Hot work in vicinity (5 ft) of a magazine.

• 1. Required to control the flammability and toxicity hazard.
• 2. Use dilution-type ventilation to protect adjacent areas. This ensures vapor concentrations remain below 10% LEL.
• 3. Run ventilation continuously.

• 1. Provides uncontaminated air for breathing or general comfort.
• 2. Can be supply or exhaust.
• 3. Rated for one complete air change every three minutes.

• 1. Captures contaminants as they are generated.
• 2. Draws them through exhaust ductwork located 6-10 inches from the work being conducted.
• 3. Effective for welding and solvent use.
• 4. Exhaust only.
• 5. The work zone farthest from the exhaust inlet requires airflow of 100 fpm towards the exhaust.

• 1. One complete air change in three minutes.
• 2. If welding, compare the results to NSTM 074 Vol 3 (pg. 74-78) and use the larger number for ventilation requirements.

• 1. H2S
• 2. Ammonia
• 3. Methane

Hydrogen

• 1. Nitrogen dioxide
• 2. Ammonia

• 1. CO
• 2. CO2

• 1. Above 22%
• 2. Below 19.5%

When concentration exceeds 10% LEL

• 1. CO2
• 2. H2S
• 3. HALON
• 4. Freon

• 1. CO
• 2. Ammonia
• 3. Hydrogen
• 4. Methane

• 1. General Info
• 2. Physical/Chem. Characteristics
• 3. Fire/Explosion Data
• 4. Reactivity Data
• 5. Health Hazards
• 6. Precautions for Safe Handling and Control Measures

• 1. Fresh Air test (Done prior to each use)
• 2. Bump test (daily before use)
• 3. Monthly calibration

• 1. Carbon Dioxide
• 2. Carbon Monoxide
• 3. Hydrogen Chloride
• 4. Hydrogen Cyanide
• 5. Hydrocarbons

Per NSTM 555-7.10.3

• 1. Section 20 = Navy Gas Free Certificates
• 2. Section 21 = Ventilation
• 3. Section 22 = Hot Work
• 4. Appendix C = Sample Gas Free Engineering Notebook
• 5. Appendix D = Navy Gas Free Certification and Test Log
• 6. Appendix E = Shipboard Hazardous Atmospheres and Compartments Identification Tables
• 7. Appendix G = Chemical Names, PEL and IDLH

• 1. Manufacturer's Chart    
• 2. NAVOSH Manual
• 3. Industrial Hygienists' Field Operators Manual (IHFOM)

• 1. Ship's Safety Officer shall audit annually.
• 2. Audit follows NAVSEA checklist found on the NAVSEA DC page.
• 3. Evaluates the GFE Service Personnel and recertification requirements.
• 4. Document Crew Training upon reporting and annually.
• 5. GFE personnel shall have letters of designation and qualifications shall be recorded in individual's service record.

• 1. Flame heating, welding, torch cutting, brazing, or carbon arc gouging.
• 2. Any operation producing temperatures of 240 deg C/400 deg F.
• 3. Any operation occurring in the presence of flammables which require the use of the presence of an ignition source.

• 1. Class I - High energy, scattered sparks.
• 2. Class II - Minimal energy, localized sparks.

• 1. Gas free every two hours.
• 2. Gas free every hour if temperatures are above 90 deg F.

• 1. Discovery and Notification
• 2. Initiation of Action
• 3. Evaluation
• 4. Containment & Damage Control
• 5. Dispersion of Gases/Vapors
• 6. Cleanup & Decontamination
• 7. Disposal of Contaminated Materials
• 8. Certification for Re-Entry
• 9. Follow-Up Reports

Green

• 1. Feet first
• 2. Head first only when transporting up or down ladders.

CNSP/CNSL INST 6000, Appendix K

• 1. Stokes Stretcher
• 2. Miller Board (Litter Splint)
• 3. Army Litter
• 4. Reeves Sleeve 2

• 1. Provide a safe working and living environment for the crew.
• 2. Provide Hazard Awareness Training of a general nature for the crew.

• 1. No flammables present or being generated.
• 2. No toxics present or being generated.
• 3. Only to provide clean air for breathing and comfort.

90-110% of cylinder value

3, 15', ducts per fan.

• 1. Ingestion (eating, drinking)
• 2. Absorption (touching)
• 3. Inhalation (breathing)

• 1. Previous chits.
• 2. Tag Out Audit.
• 3. DC Book.
• 4. WAF log.

• 1. Entry or Work Delay
• 2. Expiration (8 hours)
• 3. Hazard Detected
• 4. Ship Movement
• 5. Securing Ventilation
• 6. New Operations or Materials
• 7. Closing Space or Temporary Shutdown

• 1. Local exhaust Ventilation
•      a. Welding, Painting, Using Solvents
• 2. Dilution Ventilation
•      a. Reducing toxins, Controlling flammable vapors
• 3. General Exhaust Ventilation
•      b. Providing cool comfort air in a hazard-free environment

IDLH requires SAR/SCBA and CO permission prior to conducting work.

Conducting a test every 15 minutes

Any periodicity greater than 15 minutes.

When the exhaust of a space is located too close to the intake.

• 1. Inport - All water and soil drains to tank, then to pier riser.
• 2. Transit - Within 3 nm of coast. All black water diverts to tank, grey water to below W/L (to tank), grey water above W/L (overboard)
• 3. At Sea - Beyond 3nm of coast. All grey and black water discharges overboard.

• 1. Confine spaces that contain, or have not contained, toxic or flammable materials.
• 2. Operations which generate or have the potential to generate toxic levels above PEL.
• 3. Operations that do not result in IDLH flammable and O2 levels.

• 1. Cold Work in spaces that do not contain, or have not contained, toxic or flammable materials.
• 2. Operations which do not naturally generate toxic levels above PEL.
• 3. Operations that do not result in IDLH flammable and O2 levels.

• 1. Written approval in CO designation letter
• 2. Operations repetitive and routine
• 3. No Space immediately designated as IDLH (sewage tanks, fuel tanks, etc.)
• 4. Testing and Certification procedures clearly established in GFE instruction.
• 5. GFEPO trained and qualified to perform delegated tasks.

• 1. 2,000 cu ft per welder, if a 5/32 or 3/16 rod is used.
• 2. 3,500 cu ft per welder, if a 1/4 rod is used.
• 3. 4,500 cu ft per welder, if a 3/8 rod is used.