Cleaning Responsibilities for Workshop

Cleaning Responsibilities

• Unused material, electrodes, and chip spatter should be returned to the front of the booth
• Tabletops should be swept clean using a hand broom
• Tabletops should be sanded and swept again
• Booths should be swept clean
• Wire feeders should be swept into the centre of the aisles
• Helmets should be cleaned
• Aisles and around instructor tables should be swept
• Scrap bins should be emptied

Gases and Cylinders

• Acetylene is commonly used for welding, but MAPP gas and hydrogen can be used as alternatives.
• Propane is a stable gas, however, its low flame temperature limits its usefulness for welding.
• Oxygen and hydrogen combined create a low-temperature flame which is mostly used for welding aluminum.
• MAPP gas can be stored and shipped in lighter cylinders since it's not sensitive to shock.
• Empty acetylene cylinders weigh about 220 lbs, while empty MAPP cylinders weigh 50 lbs.
• Refillable cylinders are made of steel or aluminum and usually have a 1/4 inch thick steel wall.
• Oxygen, nitrogen, argon, hydrogen, and helium gases are compressed into cylinders made of high-strength steel or aluminum.
• Many fuel gases are supplied in liquid form at room temperature, stored at lower pressures in thin-walled steel or composite aluminum cylinders.
• Acetylene, hydrogen, and natural gas are shipped in a gaseous form, while propane, MAPP and other gases are shipped in liquid form.
• The pressure in a liquefied gas cylinder doesn't indicate the level of gas in the tank.
• High withdrawal rates from liquefied gas cylinders cause a pressure drop, lowering the cylinder temperature, and could freeze the regulator.
• Acetone absorbs acetylene, similar to how water absorbs carbon dioxide in a carbonated drink.
• Maximum withdrawal rate for acetylene cylinders should not exceed one-seventh of the total cylinder capacity per hour.
• A multiple cylinder manifold system allows for a larger volume of acetylene to be supplied to the work area.
• The maximum withdrawal rate for acetylene is 1/7th of the total volume per hour, but this might change.
• Acetylene cylinders are not seamless and have honeycombed interiors.
• Acetylene cylinders have a common pressure of 250 psi at 70°F.
• The maximum pressure used in an acetylene cylinder is 15 psi.
• Acetylene cylinders have safety devices that are triggered by heat (100°C or 212°F).
• Oxygen cylinders are typically 5 ft tall and weigh approximately 150 lbs when full.
• Liquid oxygen cylinders have the same height as standard oxygen cylinders but are twice the diameter and hold 12 times as much oxygen.
• An adjustable wrench is not recommended for use with oxy-fuel equipment.
• Specific wrenches are associated with oxy-fuel equipment, so check the wrench before using it.

Withdrawal Rates for ‘Standard’ Acetylene Cylinders

• If a 130 cubic feet acetylene cylinder is used with a torch that consumes 8 cubic feet per hour, the withdrawal rate is acceptable.
• If a 75 cubic feet acetylene cylinder is used with a torch that consumes 34 cubic feet per hour, the withdrawal rate is not acceptable.
• ‘Typical’ compressed gas oxygen cylinders are seamless and have an internal pressure of 2200 psi at 70 degrees Fahrenheit.
• ‘Typical’ acetylene cylinders are not seamless, have honeycombed interiors, a common pressure of 250 psi and a maximum pressure of 15 psi.
• ‘Typical’ compressed gas oxygen cylinders are associated with safety devices triggered by pressure.
• ‘Typical’ acetylene cylinders are associated with safety devices triggered by heat (100⁰C or 212⁰F).