Line D Regulators Flashcards

1
Q

In order to increase regulator accuracy, the pitot tube senses pressure at what point?

A

Lowest outlet pressure point

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2
Q

Which regulator will have the least amount of droop under flow conditions?

A

A pilot operated regulator

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3
Q

Critical flow in a regulator occurs when the velocity of the gas reaches what threshold?

A

Sonic Velocity

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4
Q

What does a double-ported balance regulator use to sense downstream pressure?

A

A downstream sense line

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5
Q

Where is the sense line connected on a proportional regulator?

A

To the top of the diaphragm

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6
Q

When zero governor regulators are used for burners that are to be operated under positive or negative combustion chamber conditions, how can the combustion chamber pressure be counterbalanced?Connecting a pressure reference line from the combustion chamber to the top diaphragm chamber of the zero governor

A

Connecting a pressure reference line from the combustion chamber to the top diaphragm chamber of the zero governor

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7
Q

What type of regulator is pictured below?

A

Double-ported balanced regulator

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8
Q

In the above image what is the purpose of connecting the sense line?

A

To sense outlet pressure

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9
Q

In the above image at what point is the sense line connected to the main supply piping?

A

Downstream to the top of the piping

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10
Q

What type of regulator is pictured below?

A

Atmospheric regulator

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11
Q

What would happen if the regulator shown below was installed backwards?

A

It will pass no flow

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12
Q

What would happen if the above regulator was installed upside down?

A

It would provide lower downstream pressure

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13
Q

When selecting a regulator for a gas piping system, what regulator inlet pressure should you assume there to be when the system is under no flow?

A

Static pressure (system setting)

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14
Q

For a direct-operated regulator, what amount of droop can be expected?

A

10-20%, but by code should be no more than 10%

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15
Q

When you need extreme accuracy in high-pressure gas system applications, what type of regulator is best suited for this application?

A

Pilot-operated

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16
Q

If two or more available regulator springs have published pressure ranges that include the desired pressure setting, for more accuracy you would select the spring with the lower pressure range.

TRUE / FALSE

A

TRUE

17
Q

What factors make it beneficial to select a regulator orifice size in the smallest diameter that will handle the desired flow?

A

Avoids instability and premature wear, Allows for smaller relief valves, Reduces lockup pressure

18
Q

What is used to determine the required flow of relief valves for a gas system?

A

The wide-open flow rates of the upstream regulator

19
Q

What is the maximum droop allowed from a regulator in a gas piping system?

A

10%

20
Q

What type of regulator is pictured below?

A

Pilot operated regulator