Which type of equipment is NOT covered by API 510?

Which type of equipment is NOT covered by API 510?

• A. Knock out drum rated at 12 psig at 400°F
• B. Tubular heater
• C. Unfired steam boiler
• D. A 36" expansion joint

Answer: (C)

API 510 specifically addresses the inspection, repair, alteration, and rerating of pressure vessels. This standard applies to equipment designed to hold pressure and typically includes vessels that are part of a production system, such as storage tanks and reactors. An unfired steam boiler, while it operates under pressure, is covered under a different API standard (API 650 or ASME codes) that focuses more directly on boilers and their safety. Consequently, it does not fall within the purview of API 510, which is why this option is the correct answer. The other choices are all related to equipment that is subjected to pressure processes and thus would be included under the scope of API 510. For instance, a knock out drum plays a significant role in separating liquids from gas, and its operation involves maintenance and inspection that fall under API 510 guidelines. A tubular heater and an expansion joint also relate closely to pressure vessel standards, emphasizing their inclusion in API 510's coverage.

API 510 specifically addresses the inspection, repair, alteration, and rerating of pressure vessels. This standard applies to equipment designed to hold pressure and typically includes vessels that are part of a production system, such as storage tanks and reactors.

An unfired steam boiler, while it operates under pressure, is covered under a different API standard (API 650 or ASME codes) that focuses more directly on boilers and their safety. Consequently, it does not fall within the purview of API 510, which is why this option is the correct answer.

The other choices are all related to equipment that is subjected to pressure processes and thus would be included under the scope of API 510. For instance, a knock out drum plays a significant role in separating liquids from gas, and its operation involves maintenance and inspection that fall under API 510 guidelines. A tubular heater and an expansion joint also relate closely to pressure vessel standards, emphasizing their inclusion in API 510's coverage.