Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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When installing three new packing rings in a stuffing box, what is the recommended degree spacing for the joints?

90 degrees
180 degrees
120 degrees
150 degrees

The correct answer is: 120 degrees

When installing three new packing rings in a stuffing box, the recommended degree spacing for the joints is 120 degrees. This spacing ensures that the joints of the packing do not align, which can prevent leakage and promote a more effective seal. By staggering the joints evenly around the circumference of the stuffing box, the load is distributed more evenly, minimizing wear and extending the lifespan of the packing. This approach also helps to maintain a balanced pressure on all sections of the packing, which contributes to the overall effectiveness of the stuffing box in containing fluids and preventing leaks. Proper joint spacing is critical in maintaining the integrity of the sealing system, especially in systems that operate under varying pressure and temperature conditions.