Mechanical Seals

Question 1

Why are mechanical seals better for us at chevron?

Answer 1

Mechanic seals are less periodic maintenance

Question 2

The component that prevents that leakage along the shaft through the inter surface of the primary ring and mating ring.

Answer 2

Secondary sealant/ O-ring

Question 3

What is the component called that provides positive pressure for sealing those two faces together.

Answer 3

Coil Spring

Question 4

A _____consists of grooves in the rotating face generate a fluid-dynamic force to direct any leakage of process gas towards the stationary face

Answer 4

Dry gas seal

Question 5

What another name for something commonly known as dual seal?

Answer 5

Tandem Seal

Question 6

The component of a seal system that is used to alarm operators when process variable exceeds their set limits

Answer 6

Instrumentation

Question 7

A neutral fluid introduced on the atmospheric side of the seal

Answer 7

Quench

Question 8

If you are getting poor water or steam Quench, what is wrong?

Answer 8

Throttle isolation valve not opened enough

Question 9

When you overheat the seal faces, what is it called?

Answer 9

Smoking a seal

Question 10

Likely cause of formation of solid or abrasive crystals on the atmospheric side of seal?

Answer 10

Poor water Quench

Question 11

Formation of gas pockets in a pump case?

Answer 11

Cavitation

Question 12

The differential temperature across the orifice may be due to ___________ of the seal flush.

Answer 12

Plugging

Question 13

______ is the rapid change of any liquid to its gaseous state.

Answer 13

Flashing. When heat builds up in the sealing faces due to friction, the process fluid on the sealing faces begins to vaporize or flash.

Question 14

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

Answer 14

Orifice

Question 15

Reason why seal might fail due to gas pockets in a seal cavity?

Answer 15

Improper venting

Question 16

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.

Answer 16

Primary ring

Question 17

What is the tolerance that the two seal faces must run between?

Answer 17

.001

Question 18

Identify some of the correction actions when the decrease in efficiency of a cooler?

Answer 18

Is cooling water lined up correctly?

Question 19

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?

Answer 19

Non-pusher type

Question 20

On a mechanical seal what supports system prevents from overheating and wearing of the faces?

Answer 20

Seal Flush System

Question 21

Biggest advantage of cartridge seals?

Answer 21

Easily assembled/ repaired in a shop

A complete seal assembly that can be installed in the field with minor disassembly to the pump

Question 22

The _________ ring is the stationary face that is mounted in the gland, which is mounted on the pump casing

Answer 22

Mating ring

Question 23

What Likely causes a contamination in a barrier seal pot fluid?

Answer 23

Primary Seal Failure

Question 24

If the seal side temp of the tubing from the cooler approaches the supply line what does that tell you about the cooler?

Answer 24

Reduction of the efficiency of the cooler/ not working properly

Question 25

Water lined up on cooler and temp is still high on seal pot what is wrong?

Answer 25

Fouling