Which factor is essential when tightening handhole nuts during hydrostatic testing?

The correct answer is that correct torque specifications are essential when tightening handhole nuts during hydrostatic testing. Maintaining the specified torque ensures that the nuts are secured with the appropriate amount of force, which is crucial for achieving a proper seal. If the nuts are either over-torqued or under-torqued, it can lead to several issues, such as damage to the gasket, leaks during testing, or even failure of the handhole under pressure.

Correct torque specifications ensure that the clamping force is uniformly applied across the handhole, reducing the risk of leaks and structural failures. This is particularly important during hydrostatic testing, where pressure is applied to test the integrity of the system. Meeting the manufacturer's torque specifications is critical for operational safety and reliability.

While even distribution of weight, absence of rust on the threads, and the use of lubricant may contribute to the overall effectiveness and ease of tightening the nuts, they do not hold the same level of importance as adhering to the correct torque specifications during the testing process.