Miller SMITH EQUIPMENT HANDI-HEET Посібник користувача - Сторінка 6
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It is recommended that a reverse-flow check valve or a flashback ar-
restor be installed between the torch handle and the regulator. Check
valves do not prevent the propagation of a flame upstream (flash-
back) but are designed to prevent the unintentional backflow of gases
into the cutting attachment, torch, hoses, or regulator which could
cause an explosion or fire. A flashback arrestor can be installed on the
torch handle instead of a check valve. Miller flashback arrestors have
a reverse flow check valve and prevent the propagation of a flame up-
stream. If a flashback arrestor is installed, a check valve is not neces-
sary. Using a flashback arrestor and a check valve can reduce gas
flow and affect torch operation. To help prevent the reverse flow of
gases, be sure the cylinders contain enough gas to complete the
work.
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Understand the properties and applications of a gas, and how to
safely use a gas, before placing it in service.
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Perform work only in an area with a fireproof floor (concrete). Do
not heat concrete because it can expand and explode violently.
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Perform work on a fireproof surface. Use heat resistant shields to
protect nearby walls and flooring.
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Do not use if grease or oil is present on equipment or if equipment is
damaged. Have equipment cleaned/repaired by a qualified person.
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Do not open a cylinder valve quickly or the regulator can be dam-
aged and cause a fire.
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Do not open acetylene cylinder valve more than 1−1/2 turns. (For
all gases except acetylene, open cylinder valve fully to backseal
the cylinder valve.) Keep cylinder wrench on the cylinder for quick
shut-off.
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Do not slightly open or "crack" fuel cylinder valve to blow debris
from the valve outlet. Remove the debris using nitrogen, air, or a
clean, oil-free rag.
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Always purge gas from the system before lighting torch. Purge gas
in a well-ventilated area and away from flame or sparks.
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Keep torch flame or sparks away from cylinder, regulator, and gas
hose.
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Use only the gases recommended by the manufacturer of the
oxy-fuel equipment being used.
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Never light a torch with matches or a lighter. Always use a striker.
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Do not use acetylene above 15 psi (103 kPa) flowing. It is accept-
able to use acetylene regulators that indicate a static pressure up
to 22 psi (151 kPa).
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Do not withdraw acetylene from a cylinder at a rate exceeding 1/7
of the cylinder capacity per hour (50 SCFH for a 350 ft
Maximum withdrawal rate for a half-full 100 lb propane cylinder at
70°F is 75 SCFH (2124 lph).
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When required flows (SCFH) exceed the recommended withdrawal
rate from one cylinder, then additional cylinders must be manifolded to
provide safe and efficient operation.
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When using liquid oxygen, tips may require greater gas volume than a
single cylinder is capable of producing. External evaporators or mani-
folding multiple cylinders may be necessary to supply sufficient gas
flows.
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Do not use long gas hoses or hoses with multiple connections be-
cause they restrict gas flow and reduce gas pressure. These condi-
tions can cause backfires and flashbacks, and reduce equipment effi-
ciency.
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Do not use torch if you smell gas. Check oxy-fuel system for leaks
with an approved leak detection solution or leak detector. Never
test for gas leaks with a flame.
OM-263687 Page 4
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cylinder).