After packing rings are installed firmly, by how much should you back off the gland nuts before starting the pump?

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Multiple Choice

After packing rings are installed firmly, by how much should you back off the gland nuts before starting the pump?

Explanation:
Packing rings seal around the shaft by being squeezed by the gland nuts. If you tighten too much before starting, the packing can bind as the shaft begins to turn, causing friction, heat, and wear. Backing off the gland nuts about one full turn after the rings are seated relieves that initial compression, giving the rings a chance to seat evenly and allowing a small amount of leakage to occur as the pump starts. This small drip helps the packing seal properly as it warms and settles in. After startup, you can adjust further as needed to achieve a minimal, steady drip without binding.

Packing rings seal around the shaft by being squeezed by the gland nuts. If you tighten too much before starting, the packing can bind as the shaft begins to turn, causing friction, heat, and wear. Backing off the gland nuts about one full turn after the rings are seated relieves that initial compression, giving the rings a chance to seat evenly and allowing a small amount of leakage to occur as the pump starts. This small drip helps the packing seal properly as it warms and settles in. After startup, you can adjust further as needed to achieve a minimal, steady drip without binding.

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