Mechanical Seals Flashcards
Why are mechanical seals better for us at chevron?
Mechanic seals are less periodic maintenance
The component that prevents that leakage along the shaft through the inter surface of the primary ring and mating ring.
Secondary sealant/ O-ring
What is the component called that provides positive pressure for sealing those two faces together.
Coil Spring
A _____consists of grooves in the rotating face generate a fluid-dynamic force to direct any leakage of process gas towards the stationary face
Dry gas seal
What another name for something commonly known as dual seal?
Tandem Seal
The component of a seal system that is used to alarm operators when process variable exceeds their set limits
Instrumentation
A neutral fluid introduced on the atmospheric side of the seal
Quench
If you are getting poor water or steam Quench, what is wrong?
Throttle isolation valve not opened enough
When you overheat the seal faces, what is it called?
Smoking a seal
Likely cause of formation of solid or abrasive crystals on the atmospheric side of seal?
Poor water Quench
Formation of gas pockets in a pump case?
Cavitation
The differential temperature across the orifice may be due to ___________ of the seal flush.
Plugging
______ is the rapid change of any liquid to its gaseous state.
Flashing. When heat builds up in the sealing faces due to friction, the process fluid on the sealing faces begins to vaporize or flash.
Common factor that can affect a seal flush system
Orifice
Answer is not quench line
Answer is not seal flush
Answer is not shaft alignment
Orifice
Reason why seal might fail due to gas pockets in a seal cavity?
Improper venting
The ________ ring is the rotating face of the mechanical seal that is fixed to the shaft but held closely against the casing by means of a spring and hydraulic pressure.
Primary ring
What is the tolerance that the two seal faces must run between?
.001
Identify some of the correction actions when the decrease in efficiency of a cooler?
Is cooling water lined up correctly?
What type of seal pushes the rotating face toward the stationary face by the combined force of bellows & liquid pressure - typically used for high pressure & high temperature?
Non-pusher type
On a mechanical seal what supports system prevents from overheating and wearing of the faces?
Seal Flush System
Biggest advantage of cartridge seals?
Easily assembled/ repaired in a shop
A complete seal assembly that can be installed in the field with minor disassembly to the pump
The _________ ring is the stationary face that is mounted in the gland, which is mounted on the pump casing
Mating ring
What Likely causes a contamination in a barrier seal pot fluid?
Primary Seal Failure
If the seal side temp of the tubing from the cooler approaches the supply line what does that tell you about the cooler?
Reduction of the efficiency of the cooler/ not working properly
Water lined up on cooler and temp is still high on seal pot what is wrong?
Fouling
