Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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How should the joints of split packing rings be spaced in a stuffing box?

90° apart
120° apart
180° apart
160° apart

The correct answer is: 120° apart

The joints of split packing rings in a stuffing box should be spaced 120 degrees apart. This spacing is critical for several reasons. First, it allows for balanced distribution of stress along the packing, reducing the likelihood of uneven wear and potential leaks. If the joints are evenly spaced, it helps to maintain uniform compression around the shaft, improving sealing efficiency. Additionally, having the joints positioned at 120 degrees apart minimizes the risk of creating a straight line where leaks could occur. Packing rings are typically arranged in a staggered formation to enhance sealing performance and durability, ensuring that if one joint has wear or a failure, it does not line up with another and compromise the seal. Spacing joints at this degree also aligns with industry best practices which emphasize effective sealing in mechanical applications, reducing maintenance needs and extending the lifespan of the packing material. This practice ensures optimal performance in various operational conditions.