Pump Shaft Sealing Methods

What is the purpose of sealing the place where the shaft penetrates the pump casing?

To improve the efficiency of the pump
To increase the speed of the impeller
To prevent process fluids from leaking to the surroundings (correct)
To reduce the noise produced by the pump

Why is zero leakage required in applications where fluid retention is critical?

To maintain a steady flow rate
To cool down the pump components
To prevent environmental contamination (correct)
To reduce the wear and tear on the pump

What is compression packing?

A type of impeller designed for high-pressure pumping
A lubricating material used to maintain the shaft's smooth operation
A specialized tool used to adjust the impeller speed
A soft, durable material placed between a shaft and the walls of a stuffing box to reduce leakage (correct)

What materials can be used to manufacture compression packing?

Nylon, flax, Teflon, lead, copper, and aluminum (B) Signup and view all the answers

What is the purpose of incorporating a lubricating material into the packing?

To reduce friction between the packing and the shaft (B) Signup and view all the answers

Why is excessive leakage from the pump casing undesirable?

It could result in loss of valuable process fluid (A) Signup and view all the answers

What is the purpose of the gland in a pump?

To hold the rings in place (A) Signup and view all the answers

Why are shaft sleeves installed over the shaft when packing is used in a pump?

To take the wear from contact with the packing (C) Signup and view all the answers

What happens if the operator tightens the gland so much that all fluid flow stops?

Fluid lubrication will be unavailable, causing the shaft and packing to heat up (A) Signup and view all the answers

What is the purpose of a lantern ring in a stuffing box of a pump?

To distribute sealing water to the packing and prevent air leakage (D) Signup and view all the answers

Why should rough surfaces on the shaft or shaft sleeve be replaced?

Rough surfaces will damage packing (C) Signup and view all the answers

What is the purpose of measuring the bore of the stuffing box and the diameter of the pump shaft when replacing pump packing?

To determine the correct size (thickness) of packing to use (B) Signup and view all the answers

What is the purpose of applying a light coating of oil or grease on the inner diameter of each ring?

To reduce friction between the rings and the shaft (A) Signup and view all the answers

What is the purpose of tamping the rings into the stuffing box one at a time?

To push the rings into place and ensure proper positioning (D) Signup and view all the answers

Why is it important to loosen off the gland nuts to just finger tight after compressing the packing slightly?

To allow for expansion of the packing (D) Signup and view all the answers

What should be done when the pump is first put in service regarding the packing leakage?

Keep the follower loose to allow maximum leakage (D) Signup and view all the answers

Why are staggered ring joints important during installation?

To avoid creating weak points in the sealing (D) Signup and view all the answers

What should be used to push the rings into place during installation?

Split wooden bushing or metal ring (C) Signup and view all the answers

What is the purpose of restoring the lockout after installing the packing?

To re-establish safety measures and procedures (A) Signup and view all the answers

Why is it recommended to allow for expansion of the packing after compressing it slightly?

To accommodate thermal variations and pressure changes (C) Signup and view all the answers