The marking 4B240 indicates the cylinder is made of which material?

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Multiple Choice

The marking 4B240 indicates the cylinder is made of which material?

Explanation:
Cylinders have markings that tell you what material they’re made of and what pressure they’re rated for. The first part of the marking, 4B, identifies the cylinder type and construction material—in this standard, that code corresponds to steel. The number that follows represents the pressure rating, with 240 indicating 2400 psi. So, this marking shows a steel cylinder rated for about 2400 psi. Aluminum or other materials use different first-part codes, so the marking would look different for those.

Cylinders have markings that tell you what material they’re made of and what pressure they’re rated for. The first part of the marking, 4B, identifies the cylinder type and construction material—in this standard, that code corresponds to steel. The number that follows represents the pressure rating, with 240 indicating 2400 psi. So, this marking shows a steel cylinder rated for about 2400 psi. Aluminum or other materials use different first-part codes, so the marking would look different for those.

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