What is the required contact for non-pumping groove joints after opening a propulsion turbine casing joint?

The correct answer specifies a requirement of 75 percent contact over the entire joint for non-pumping groove joints after opening a propulsion turbine casing joint. This standard ensures that there is sufficient surface area for a proper seal, crucial for maintaining integrity and performance in a propulsion system.

In applications like this, where pressure and fluid dynamics are a concern, having adequate contact helps to prevent leaks that could compromise the system's functionality. The 75 percent contact allows for effective distribution of stresses and helps in accommodating thermal expansion, which can occur due to the high temperatures in a propulsion turbine environment.

Achieving full contact or exceeding the specified percentage could lead to issues such as distortion of the joint or increased wear on the sealing surfaces, while too little contact could result in failure to maintain a seal under operational conditions. The specified 75 percent strikes a balance between effective sealing and operational safety.