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How can appliances and equipment that are not designed for high pressures be isolated during a pressure test?

  1. By replacing the unions

  2. By closing the shut-offs and splitting the unions

  3. By installing new pressure regulators

  4. By using adjustable valves

The correct answer is: By closing the shut-offs and splitting the unions

Isolating appliances and equipment that are not designed for high pressures during a pressure test is effectively achieved by closing the shut-offs and splitting the unions. This method directly addresses the need to protect sensitive components from the potentially damaging impact of high-pressure tests. When shut-off valves are closed, they prevent the high-pressure gas from flowing into the appliances, effectively isolating them from the system under test. By splitting the unions, the connection between the line being tested and the appliances can be safely broken, ensuring that no pressure is transmitted to the appliances that could cause damage or unsafe conditions. This approach is particularly important when working with equipment that may not be rated for the pressures involved in the testing, ensuring that their integrity and safety are maintained. The other choices suggest methods that may not adequately protect the appliances from high pressure. Replacing unions may not offer any protection if the new unions are still connected to the same pressure source. Installing new pressure regulators can control downstream pressure but does not isolate appliances during the testing phase. Using adjustable valves could regulate flow but may not provide complete isolation from high pressures. Thus, closing shut-offs and splitting unions is the most effective and safest method in this scenario.