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Calgary Tel 1-403-221-8077 Fax 1-403-221-8072 E-mail: [email protected] Website: www.seal.ab.ca H 2 S PROTECTION NPC TRAINING PROGRAM COURSE MATERIALS Presented by Sean Massier

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Page 1: H2S Student Handout

Calgary Tel 1-403-221-8077 Fax 1-403-221-8072 E-mail: [email protected] Website: www.seal.ab.ca

H2S PROTECTION

NPC TRAINING PROGRAM

COURSE MATERIALS

Presented by Sean Massier

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Table of Contents H2S PROTECTION.......................................................................................................... 1

COURSE OBJECTIVE ......................................................................................................... 1

HYDROGEN SULPHIDE ............................................................................................... 3 PROPERTIES OF H2S ......................................................................................................... 3 HOW H2S FORMS.............................................................................................................. 3 LOCATIONS IN THE OIL AND GAS INDUSTRY.................................................................... 4 MEASURING IN % AND PPM.............................................................................................. 4 OCCUPATIONAL EXPOSURE LIMITS (OEL)....................................................................... 4

EFFECTS ON HUMAN BODY ...................................................................................... 5 LUNG ACTION .................................................................................................................. 5 ACIDITY OF H2S IN SOLUTION .......................................................................................... 5 H2S TOXICITY TABLES...................................................................................................... 5

PERSONAL PROTECTION........................................................................................... 7 DIFFERENT APPLICATIONS............................................................................................... 7 ADVANTAGES AND DISADVANTAGES .............................................................................. 7 FACTORS AFFECTING AIR CONSUMPTION.......................................................................... 7 COMPONENTS OF SCBA .................................................................................................. 8 COMPONENTS OF SABA................................................................................................ 10 CASCADE STORAGE CYLINDERS AND REGULATORS ...................................................... 11 DEMONSTRATION........................................................................................................... 11 ESCAPE CYLINDER......................................................................................................... 12 SCBA / SABA............................................................................................................... 13 PRE-USE INSPECTION CHECKLIST FOR SCBA................................................................ 14 PRE-USE INSPECTION CHECKLIST FOR SABA................................................................ 15 CLEANING, INSPECTION AND STORAGE.......................................................................... 16

RESCUE .......................................................................................................................... 17 TECHNIQUES FOR LIFTING AND CARRYING VICTIM TO SAFE AREA .................................. 18 RESCUE BREATHING AND CARDIO PULMONARY RESUSCITATION (CPR)....................... 21 MEDICAL ATTENTION .................................................................................................... 23

DETECTION AND MONITORING ............................................................................ 25

ELECTRONIC H2S MONITORS ......................................................................................... 25 TUBE TYPES – BELLOWS AND PISTON ............................................................................ 29 INSTRUCTOR’S DEMONSTRATION................................................................................... 32 MULTIGAS MONITOR - LOWER EXPLOSIVE LIMIT (LEL) ............................................... 33 SO2 MONITORS .............................................................................................................. 34

CLASSROOM CASE STUDIES................................................................................... 35

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HH22SS PPRROOTTEECCTTIIOONN

Course Objective

The objectives for this course:

• The S.E.A.L. International Hydrogen Sulphide (H2S) Protection course is

designed for oilfield personnel who have little or no formal H2S training.

• Ensure you know what to do when H2S is present.

• Protect yourself from the dangers of H2S.

All topics within this training course are dealt with in general terms for ease of

understanding. However, full technical details are available to personnel who want or

need to know them. The format of S.E.A.L. International’s H2S Protection course is such

that it is completed in 6 to 8 hours.

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HHYYDDRROOGGEENN SSUULLPPHHIIDDEE

Properties of H2S

• usually found as a gas

• colourless

• smells like rotten eggs

• specific gravity

heavier than air

gravitates towards low lying areas

influenced by wind direction

• solubility

dissolves easily in water and oil as well as most other fluids commonly

used in the oil and gas industry

• flammable

burns with a blue flame

• explosive in certain ranges

• burning H2S to create sulphur dioxide (SO2)

properties of SO2 gas

• direction

How H2S forms

• Rotting plant and animal matter

Found in sewage treatment facilities, animal barns (manure), and chemical

processing plants.

• Associated with hydrocarbons

Oil and gas are formed by decaying plant and animal matter from millions

of years ago.

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Locations in the Oil and Gas Industry

• drilling mud returns (shale shaker, bell nipple)

• flow lines

• flare pits

• production tanks and facilities

• cement and spent acid returns

• hydraulic fracturing fluid returns

Measuring in % and ppm

• The relative size of 1 ppm

Let’s take, for example, the 1,000-kilometre distance between Tehran and

Robat Sharat (close to Mashhad). One (1) part per million of that distance

is one (1) metre, or a long step.

• ppm expressed as a percentage (10,000 ppm = 1%)

1% = 10,000 ppm

one tenth of 10,000 ppm = 1,000 ppm

one tenth of 1% (1,000 ppm) is more than enough to kill you

ideal working condition is 0%

Occupational Exposure Limits (OEL)

• Recommended exposure limits

10 ppm – maximum allowable for 8-hour period

15 ppm – maximum allowable exposure for 15 minute period with 60

minute space between exposures

20 ppm – maximum exposure limit – must wear breathing apparatus

best industry practice – 0 ppm exposure

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EEFFFFEECCTTSS OONN HHUUMMAANN BBOODDYY

Lung action

• Oxygen (O2) – carbon dioxide (CO2) exchange.

• H2S molecules easily enter system via lungs and blood flow.

• Interrupts breathing control centre in brain.

• Breathing stops, heart stops, no oxygen goes to brain.

• Lack of oxygen causes death.

• Pulmonary edema. After exposure to H2S the lungs will secrete a fluid, which

will cause further problems. Medical attention must be sought.

Acidity of H2S in solution

• H2S is acidic when it’s mixed with water.

• Eyes and nose will burn in acidic H2S environment.

• Loss of smell due to burned receptors.

H2S toxicity tables

• 20 ppm – eye, nose and throat irritation

• 20-200 ppm – loss of smell, headache and nausea

• 500-700 ppm – affects central nervous system. Loss of reasoning and

balance. Consciousness quickly is lost, and breathing stops.

• 700-1,000 ppm – Immediate loss of consciousness. Permanent brain damage.

Death will occur if not rescued immediately.

• 1,000 ppm is only 1/10th of 1%!

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PPEERRSSOONNAALL PPRROOTTEECCTTIIOONN

Different Applications

• SCBA’s are used for safety watch and rescue operations, they are portable and

allow unrestricted mobility.

• SABA’s are used to hook up several workers at once, while providing

continuous air supply.

Advantages and Disadvantages

Here is a list of advantages and disadvantages of SCBA and SABA.

TYPE ADVANTAGES DISADVANTAGES SCBA Complete flexibility of

movement. Used for rescue operations

Allows approximately 30 minutes of air supply.

SABA Continuous air supply. Much lighter and bulkier

Limits flexibility of movement. Supply line may become wrapped around equipment and be damaged.

Factors affecting air consumption

• Size and physical condition of wearer

• Emotional state – discuss fear, hyperventilation, claustrophobia

• Physical activity of wearer

• Training in equipment usage

• Amount of air in cylinder

• Condition of equipment

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Components of SCBA

• There are many makes and models of SCBA used in the Oil and Gas industry.

They all have the same four basic components.

Air Supply

Regulator Assembly

Mask Assembly

Harness Assembly

Air Supply • The air supply is made up of three components:

An air cylinder

A cylinder valve

A cylinder pressure gauge

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Regulator Assembly • The regulator assembly consists of:

A high-pressure system

Pressure regulators

A bypass/purge valve

A pressure gauge

A low-pressure alarm

Mask Assembly • The mask assembly is made up of five parts:

A face piece

A low pressure hose/breathing tube

A nose cup

An exhalation valve

A head harness

NOTE:

The most important aspect of the face piece is the seal it forms around your face. You use the head harness to adjust the seal around your face. You must be clean-shaven where the face piece and your face meet to ensure a proper seal.

Harness Assembly • The harness assembly consists of the following:

Adjustable harness in either sling or backpack style.

Holds air cylinder in place

Key to portability of the SCBA

Allows to carry the cylinder so you can carry on your work

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Components Of SABA

• The SABA systems have a remote source of breathing air that can supply air

to several workers. It’s important that you are able to identify the major

components of the system.

• Two (2) major components of SABA are different from SCBA, and they are:

Air supply; and

Egress (Escape) Cylinder

Air Supply • Air may be supplied from a:

compressor; and

A bank of cylinders pit-tailed together

NOTE:

Verify there are no kinks, knots or damage to the air hose. There is no alarm on SABA. Should any breathing problems arise while using a supplied air system the worker must immediately disconnect the supplied air hose, open the egress cylinder and exit to a safe area.

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Cascade Storage Cylinders and Regulators

Cascade storage cylinders are pressured by a breathing air compressor. The pressure in

the storage cylinders is usually maintained at 2500 psi or 4500 psi depending on the

particular system. This high-pressure air is fed through a regulator reducing the pressure

to approximately 100 psi in order to supply air to the hoses that will be connected to the

SABA’s. The bank of cascade storage cylinders and compressor are always situated in a

safe area away from H2S.

Demonstration

Now we will have plenty of hands on practice. The instructor will demonstrate

techniques using SABA and SCBA. After you are shown the proper methods, you will

be given a chance too practice.

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Escape Cylinder

• When you enter an atmosphere that may be Immediately Dangerous to Life

and Health (IDLH), your supplied air unit must always be quipped with an

escape cylinder.

• This cylinder will last approximately 5 minutes.

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INSPECTIONS BEFORE AND AFTER USE

SCBA / SABA

• To operate breathing apparatus safely, you must be able to tell if it’s in good

repair and working properly, which is done by conducting a pre-use inspection

for both SCBA and SABA.

SCBA

SABA

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Pre-Use Inspection Checklist for SCBA

YES NO Answer all of these questions:

Are all required components available? These include:

Air cylinder

Regulator assembly

Mask assembly

Harness assembly

Cylinder at full pressure?

Low-pressure hose (breathing tube) intact? The hose clamps tight?

Regulator gauge indicate same pressure as cylinder pressure gauge?

Regulator control valves in their proper position?

Head harness intact and straps fully extended?

Mask clean and dust free?

Lens clear and free of scratches

Nose cup installed correctly?

Exhalation valve intact, clean and functioning properly?

Harness straps clean, in good repair and fully extended?

Alarm work properly?

Purge valve work?

If you answered yes to all questions, close the cylinder valve, slowly bleed pressure from the system and repack the SCBA in storage case.

Your SCBA is ready for immediate use and

***NEVER USE A DAMAGED BREATHING APPRARATUS***

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Pre-Use Inspection Checklist for SABA

YES NO Answer all of these questions:

Are all required components available? These include:

Regulator assembly

Mask assembly

Escape cylinder

Harness assembly

Escape cylinder at full pressure?

Air supply line and manifold intact?

Low-pressure hose (breathing tube) intact?

Head harness intact and the straps fully extended?

Mask clean and dust free?

Lens clear and free of scratches

Nose cup installed correctly?

Exhalation valve intact, clean and functioning properly?

Harness straps clean, in good repair and fully extended?

Purge valve work?

Your SABA is ready for immediate use if you answered yes to all questions.

***NEVER USE A DAMAGED BREATHING APPRARATUS***

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Cleaning, Inspection and Storage

It’s very important to inspect and clean your breathing apparatus after every use to ensure

it’s in good working condition for the next person.

This is what you need to perform:

• For SCBA, replace or refill air cylinder with a fully charged one.

• For SABA, replace or refill the escape cylinder if it has been used.

• Clean face piece.

• Inspect harness.

• Perform a pre-use inspection on apparatus.

• Store apparatus in appropriate area.

NOTE:

For all breathing apparatus, follow manufacturer’s specifications for maintenance, inspection and storage.

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RREESSCCUUEE The brain can only survive for approximately 4 to 6 minutes without a continuous supply

of oxygen. You should discuss as a group, in your pre-job safety meeting, a plan

designed to rescue your victim(s) to fresh air and resuscitate them within 3 minutes. A

typical response to an H2S release or alarm would be:

• Sound alarm if not already operating.

• Evacuate to upwind muster areas.

• Account for all personnel.

• Assess situation to determine best procedures for rescue and/or shut in.

• Protect personnel who will be re-entering hazardous area with appropriate

breathing apparatus.

• Perform rescue and/or shut in.

• Revive victims and send for medical assistance.

In order to expedite some of the above steps, an emergency response plan should be in

place and regular drills performed to practice the plan. The emergency response plan

should include such things as:

• Pre-job selection of rescue teams and assignment of duties.

• Map of facility to pre-plan a search pattern for missing personnel.

• Emphasis on “buddy system” and working in teams.

• At least two muster (emergency briefing) areas each equipped with SCBA’s

and rescue equipment.

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Techniques for lifting and carrying victim to safe area

Collar Drag

Used in one-on-one rescue situations. The key advantage to this technique is that the

victim’s weight does not need to be lifted.

Use the following steps:

• Victim must be on his back.

• Roll up collar on victim’s coveralls to get a firm grip.

• Support victim’s head on your forearms.

• Pull victim to safety, head first.

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Two arm drag Use this technique for two-arm drag.

• Place the victim on his back.

• Lift victim up by the back supporting the neck and head.

• Use your thigh or knee to support the victim’s back.

• Put your arms under victim’s armpits.

• Get a firm hold on victim’s wrists.

• Drag victim to safety.

Step 1

Step 2

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Two man carry This technique is referred to as a lift. Use this technique for two man carry.

• Place victim on his back.

• One rescuer places himself at the victim’s head, and supports the victim’s

head and neck.

• The other rescuer places himself at the victim’s feet, grips the victim’s wrists

and pulls him into an upright position

• The head rescuer reaches under the victim’s armpits and firmly grasps his

wrists.

• The foot rescuer faces the victim’s feet, crouches down and takes hold of the

victim’s legs.

• The rescuers work together to lift the victim evenly.

Step 2

Step 1

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Rescue Breathing and Cardio Pulmonary Resuscitation (CPR)

It is recommended that First Aid and CPR techniques be taught to International Red

Cross/Red Crescent standards.

These guidelines are general information. It’s important that you continue to learn the

skills required in First Aid/CPR.

STEP 1

STEP 2

Determine Unresponsiveness

Check Breathing

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STEP 3

STEP 4

Give 2 slow breaths

Check Pulse

Recovery Position

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Medical Attention

Removing a victim from a contaminated H2S area may not be enough to save his life. If

a victim is not breathing, administer artificial respiration. During this lesson, the

instructor will demonstrate the proper procedure for rescue breathing. Please refer to the

notes above as a guideline.

A victim of H2S inhalation is in danger of developing medical complications for some

time after he has been rescued. Once the immediate H2S emergency has been brought

under control, victims should be transported to a health care facility at which they can

receive professional medical attention and remain under observation until released by the

appropriate medical authorities.

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DDEETTEECCTTIIOONN AANNDD MMOONNIITTOORRIINNGG

Electronic H2S Monitors

Electronic monitors use sophisticated electronics to measure the concentration of H2S and

other hazardous gases.

Electronic monitors contain a sensor, which may be powered by batteries or AC power.

Components of personal, portable and fixed monitors:

• If it’s a personal, portable or fixed monitor, the basic components of the unit

include:

Power source

Sensor(s)

Visual display (flashing light or read-out)

Audible alarm

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Personal monitors

• Designed to be worn by the worker, may clip onto a belt, fit in an outside

pocket or be worn on a harness.

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Portable monitors

• Designed to be placed between the worker and the source of H2S, or in a

confined space.

NOTE:

Always follow the recommended manufacturer’s instructions when operating a personal or portable monitor.

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Fixed monitors

• Most sophisticated type of electronic monitor. Permanently installed units

and usually found in gas plants and oil batteries.

• The system consist of:

Central control unit

Remote display(s)

Remote sensor(s)

Alarm(s)

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Tube types – Bellows and Piston

Piston-Type Unit

It’s a pump operated by the action of a piston to create a vacuum.

• A pump consist of the following:

cylinder

piston with handle

inlet

vacuum indicator

valves and seals

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Bellows-Type Unit

A bellows pump is used to create the vacuum necessary to take a sample.

• A bellows-type unit consists of:

A spring-loaded bellows

Inlet

Vacuum indicator

Stroke counter

A valve and seals

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Detector Tubes

There are various types of indicator tubes designed to detect a wide variety of gases.

• All tube manufacturers make tubes designed for different types and

concentrations of gas.

• The concentration readings on the tube are in either ppm or percentages.

• The accuracy of detector tubes may vary by up to (+-25%) of the true gas

concentration depending upon their make and type.

• Some elements that affect the accuracy of a detector tube reading include:

condition of the pump (air tightness)

age of the tube (check expiry date on box)

temperature

operating procedures

storage conditions

interferences from other airborne contaminants

• Always store detector tubes in a cool dark place.

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Instructor’s Demonstration

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Multigas Monitor - Lower Explosive Limit (LEL)

The Watchman Multigas Monitor is a durable, hand-held instrument used to detect and

monitor combustible gases, oxygen and toxic gases in workplace atmospheres, especially

in confined spaces such as manholes, storage tanks, tank cars, vaults, mines and sewers.

If the combustible gas level reaches 100% of the Lower Explosive Limit (LEL), the

alarm locks and cannot be reset until the user moves to fresh air, turns the unit off and

back on again.

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SO2 Monitors

For continuous area monitoring and alarm of toxic gases in the workplace environment.

For chlorine/chlorine dioxide, fluorine/hydrogen fluoride, sulphur dioxide (SO2),

hydrogen sulphide and hydrogen chloride.

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CCLLAASSSSRROOOOMM CCAASSEE SSTTUUDDIIEESS