Based on the given table, the largest tip orifice size (drill number) that could be used with an acetylene cylinder containing 175 cu ft (4956 l) is 43 drill number.
What is the largest tip orifice size needed?
The largest tip orifice is based on the capacity of the acetylene cylinder.
As the acetylene flow rate cannot exceed 1/7 of the capacity, the flow rate is:
= 1/7 x 175
= 25 cfh
From the table given, the drill number that corresponds to 25 cfh is 43 drill no.
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