What is the maximum pressure for soft patch usage?

The maximum pressure for soft patch usage is indeed subject to specific guidelines. In many cases, soft patches are not limited by a specific psi restriction, which allows for flexibility in their application. They are designed to adapt to various pressure levels, particularly in temporary repair situations, where the key factor is ensuring that they can fit securely and effectively seal leaks or weaknesses in pipelines without a defined upper pressure limit.

While there are practical considerations when using soft patches at higher pressures, the inherent design and purpose of soft patches allow them to function across a range of conditions. This is why stating "No restrictions" reflects the versatile nature and operational principles of soft patches in maintenance and emergency scenarios.

In contrast, the other choices indicate specific pressure thresholds that would typically pertain to different types of patches or repair methods, which is not applicable in this context for soft patches.