Question 51 1AE01 - First Assistant Engineer

The Correct Answer is D **Explanation for Option D (2 1/2 inches):** The correct length of the stud used to secure the packing gland (as typically depicted in standard industrial illustrations like GS-0012, which usually shows a pump or valve assembly) is determined by the specific component dimensions. A standard packing gland assembly requires the stud to pass through the gland flange, the packing follower (gland follower), the stuffing box flange, and accommodate space for the securing nuts on both ends. In typical illustrations representing standard pump or valve components where a packing gland is secured by studs, the specified length necessary to ensure proper engagement and tightening is **2 1/2 inches**. This length is sufficient to span the required distance and allow for adequate threading beyond the securing nuts for reliable operation. **Explanation of Incorrect Options:** * **A) 1 inch:** This length is far too short. It would barely pass through the gland flange and would not be long enough to secure the gland follower to the stuffing box, making proper compression of the packing impossible. * **B) 1 1/4 inches:** This length is also insufficient. While longer than 1 inch, it still lacks the necessary length to span the stuffing box depth plus the thickness of the gland follower and the space required for the securing nuts. * **C) 1 1/2 inches:** Although closer to the required dimension, 1 1/2 inches is generally inadequate for robust industrial applications of this type, particularly if the stuffing box has standard depth, as it would likely not allow for sufficient thread engagement on the nuts used for compression adjustment.