The variable spring on a spring-type hangar should be adjusted to what position before the pipeline is put into service?

The variable spring on a spring-type hangar should be adjusted to what position before the pipeline is put into service?

• A. Hot
• B. Cold
• C. Neutral
• D. Fully extended

Answer: (B)

Spring hangers are used to absorb the movement a pipeline experiences as it heats up. When commissioning the line, you set the spring to the cold position—at ambient temperature—so there’s room for expansion once the system goes hot. As the pipe warms, it lengthens and the spring moves to take up that change, keeping the load on the supports appropriate without overstressing anything. If you set it to hot or fully extended, there isn’t adequate room for further expansion or the preload is off for service, which can cause overstressing or insufficient support. Neutral isn’t the correct baseline for this reason. So, the cold position is the correct setup before putting the pipeline into service.

Spring hangers are used to absorb the movement a pipeline experiences as it heats up. When commissioning the line, you set the spring to the cold position—at ambient temperature—so there’s room for expansion once the system goes hot. As the pipe warms, it lengthens and the spring moves to take up that change, keeping the load on the supports appropriate without overstressing anything. If you set it to hot or fully extended, there isn’t adequate room for further expansion or the preload is off for service, which can cause overstressing or insufficient support. Neutral isn’t the correct baseline for this reason. So, the cold position is the correct setup before putting the pipeline into service.