What specification applies to a system designed to handle pressures above 900 psi?

In the context of high-pressure piping systems, the specification that applies to systems designed to handle pressures above 900 psi is typically focused on the diameter of the piping components. The correct choice indicates that a pipe with a diameter of 3/4 inch is suitable for such high-pressure applications.

Piping systems are rigorously designed based on pressure ratings, and smaller diameters can be designed to handle high pressures more effectively due to their reduced volume and robust materials typically used in high-pressure applications. A 3/4-inch diameter pipe is commonly specified in high-pressure settings because it can handle the required pressures while ensuring structural integrity and minimizing the risk of failure.

Larger diameters or those that are significantly smaller would generally not be appropriate for pressures exceeding 900 psi. Larger pipes might not be as effective for high pressure due to increased risk of deformation or failure under high stresses. At the same time, very small diameters may not provide the strength needed for such pressures without utilizing specialized materials or additional reinforcements, potentially leading to inefficient flow characteristics and increased risks.

Thus, the 3/4-inch specification is often a practical and safety-oriented choice for systems operating at pressures above 900 psi, making it the correct answer in this situation.