Plumbing requirements for supply gases
| Warning | |
|---|---|
  | OXYGEN GAS CAN CAUSE A FIRE HAZARD
If you use oxygen as the plasma gas for cutting, it can cause a
potential fire hazard due to the oxygen-enriched atmosphere that collects. A
fire can occur if oxygen is not removed.
Hypertherm recommends that you install an exhaust ventilation system to
remove the oxygen-enriched atmosphere that can collect when oxygen is used as
the plasma gas for cutting.
Flashback arrestors are REQUIRED to stop the spread of fire to the
supply gases (unless a flashback arrestor is not available for a specific gas or
pressure).
As an installer or user, you must supply the exhaust ventilation and
flashback arrestors for your cutting system. You can get them from your cutting
machine supplier.
|
| Warning | |
|---|---|
| HYDROGEN GAS CAN CAUSE AN EXPLOSION OR FIRE
Hydrogen is a flammable gas that can cause an explosion or fire if it
is not removed.
Keep flames away from cylinders and hoses that contain hydrogen. Keep
flames and sparks away from the torch when using hydrogen as a plasma
gas.
Consult your local safety, fire, and building code requirements for the
storage and use of hydrogen.
Hypertherm recommends that you install an exhaust ventilation system to
remove the hydrogen-enriched atmosphere that can collect when hydrogen is used
as the plasma gas for cutting.
Flashback arrestors are REQUIRED to stop the spread of fire to the
supply gases (unless a flashback arrestor is not available for a specific gas or
pressure).
As an installer or user, you must supply the exhaust ventilation and
flashback arrestors for your cutting system. You can get them from your cutting
machine supplier.
|
- Make sure to obey all applicable codes and regulations for supply gas plumbing:
- All installer or user-supplied equipment must obey applicable national and local codes for supply gases and supply gas plumbing. Speak with a licensed plumber for more information about the codes in your location.
- Any installation, modification, or repair of supply-gas equipment or plumbing systems must be done by a licensed plumber.
- You can use flexible hoses that are designed to carry the appropriate gas and are rated for the correct pressure. Other hoses can crack and leak.
- For the best results, use the recommended torque specifications for plumbing and hose fittings in the Torque specifications for gas or water plumbing and hose connections.
- You can use rigid copper pipes.
- Do not use steel or aluminum.
Note:
Supply-gas hoses are available from Hypertherm®. Refer to Cable, hose, and lead parts. All installer or user-supplied equipment must obey applicable national and local codes for supply gas and supply gas plumbing. Speak with a licensed plumber for more information about the codes in your location.
Hypertherm recommends an internal diameter of at least 10 mm (0.375 inch) for supply-gas hoses that are 76 m (250 feet) or less.
| Fitting type | Dimensions |
|---|---|
| N2 / Ar | 5/8 inch – 18, RH internal (inert gas) "B" |
| Air | 9/16 inch – 18, JIC #6 |
| F5 / H2 | 9/16 inch – 18, LH (fuel gas) "B" |
| O2 | 9/16 inch – 18, RH (oxygen) |
Note:
The location of regulators and the number of elbow fittings can have an effect on inlet pressure. If the inlet pressure for your cutting system is not within recommended specifications, speak with your cutting machine supplier or regional Hypertherm Technical Service team.
| Notice | |
|---|---|
PTFE TAPE CAN CAUSE CLOGGED VALVES, REGULATORS, AND
TORCHES
Never use PTFE tape on any joint preparation. Use only a liquid or paste
thread sealant on male thread ends.
| |
| Notice | |
|---|---|
INCORRECT SUPPLY-GAS CONNECTIONS CAN CAUSE CUTTING SYSTEM
DAMAGE
Incorrect connections can reduce the life of consumables and cause
damage to the torch head, torch receptacle, torch leads, and torch connect
console.
NEVER connect a supply gas to a hose, connection, or fitting that is not
designed for that gas type or pressure.
| |
| Notice | |
|---|---|
INCORRECT HOSES, CONNECTIONS, OR FITTINGS CAN CAUSE DAMAGE AND BAD
PERFORMANCE
Noncompliant hoses, hose connections, or hose fittings can crack or
leak. Incorrect fittings can cause malfunctions with the internal valves because
contaminants can enter the valves through damaged or loose
fittings.
All hoses, hose connections, and hose fittings used for supply-gas
plumbing must be designed for use with the appropriate gas and pressure rating.
NEVER connect a supply gas to a hose, connection, or fitting that is not
designed for that gas type or pressure. A replacement hose, connection, or
fitting must meet all applicable regulations and codes.
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| Notice | |
|---|---|
DIRTY, OILY AIR CAN CAUSE DAMAGE TO THE AIR FILTER BOWL
Some air compressors use synthetic lubricants that contain esters.
Esters can cause damage to the polycarbonates in the air filter
bowl.
Add more gas filtration if necessary.
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