The Pascal (Pa) is the:

International System of Units (SI) unit of pressure.

Minimum size volume required for the test.

Metric equivalent of standard barometric pressure.

Extending the length of a pressure change test will normally cause an increase in the:

Reliability of the test results.

Moisture content of the test gas.

Indicating dial and recording pressure gages used in pressure change measurement testing should preferably have dials graduated over a range of about double the intended maximum test pressure, but the range should not be less than one and one half or more than four times the test pressure because;

These bourdon tube or diaphragm type gages are usually less accurate in the upper and lower ends of their range.

These gages always have larger more readable pressure increments in the middle of their range.

It provides the operator with a means of reading the pressure when the system is overpressurized.

Pressure change measurement testing is performed for which of the following reasons?

To determine that total leakage rate is acceptable after performing nonquantitative preliminary leak testing methods.

To prevent material loss by leakage, prevent contamination, creation of hazardous conditions or disfigurement caused by product leakage.

To detect faulty components and control the reliability of the product.

The purpose of a mirror reflector on the face of a dial pressure gage is to:

Reduce human reading error by providing a method in which the reading is taken by lining up the indicator needle over the reflection of the indicator needle in the mirror.

Make it possible to read the gage indicator needle from any angle of reflection.

Increase the light gathering capability of the gage to make it easier to read the indicator needle.

Magnify the graduations on the face of the gage to make them more visible and easier to read.

Assuming no leakage, which of the following will cause a pressure decrease to be observed shortly after pressurizing and isolating a rigid volume container?

Internal gas temperature decrease.

Atmospheric air temperature decrease.

Internal gas dewpoint temperature increase.

For a given time period, pressure change measurement testing sensitivity is greater for systems with:

Smaller contained volumes at test pressure.

Larger contained volumes at test pressure.

Fewer numbers of penetrations or fittings.

The purpose of measuring the internal gas dewpoint temperature during a pressure change measurement test of a very large volume system is to determine the:

Moisture level in the system to prevent an electrical short of the circulating and cooling fans.

Effect of the water vapor on the temperature.

Amount of moisture coming from any recently poured green concrete within the system.

One way to increase the accuracy and reliability of the results of a pressure change measurement test is to;

Extend the time period of the test.

Use a more reliable person to record the gage readings.

Decrease the allowable pressure change for the same time period.

Increase the contained test volume by increasing the test pressure.

The leakage rate for a pressure change measurement test of a system is dependent on which of the following source or sources of error?

Calculation of the volume of the system, particularly if it is large and complex in configuration.

Measurement of internal temperature variation of the system.

Minimum detectable pressure change (resolution) of the pressure measuring instrument or gage.

For pressure change measurement tests of short duration, such as 0.25 to 1 h, it is usually not necessary to:

Perform any preliminary testing.

Disconnect the pressurizing line and leak test this connection.

As soon as an evacuated system is isolated from the vacuum pumps for a pressure change measurement test, there is an initial rapid rise of pressure that eventually slows to a much smaller steady pressure rise value. This initial rapid pressure rise is caused mostly by:

Outgassing of adsorbed gases from the system surfaces.

Cooling of the back streamed diffusion pump oil within the system.

Large torturous path leakage in the system.

The nature of numerous virtual leaks inherent in all vacuum systems.

Pressure change measurement test techniques can be used for:

Leakage measurement or monitoring.

Leakage monitoring and leak location.

The flow measurement technique of pressure change measurement testing is performed on rigid volume systems by:

Measuring the gas quantities added to or removed from the system in order to hold the system absolute pressure constant.

Heating or cooling the system to maintain a constant system absolute pressure and measuring the resulting or cooling rates as a factor of the system total volume.

Measuring the tracer gas leaking from the system using a residual gas analyzer.

Connecting flow meters to the sources of leakage in the system and totaling the monitored flow readings.

When the flow measurement technique of pressure change measurement testing is performed on a variable volume system, such as a tank with a flexible diaphragm, the test factor that remains constant is the:

System internal gas temperature.

Flow measurement into or out of the system.

Contained volume in the system at test pressure.

For a pressure change leakage rate test of a large volume system, use of an absolute pressure gage provides test pressure data that is independent of variations in:

System internal gas temperature.

System internal dewpoint temperature.

Contained mass or volume in the system.

Dewpoint temperature is that temperature at which the gas in a test system would:

Be capable of holding no more water vapor and condensation in the form of dew would occur.

Be capable of evaporating free standing water in the system.

Be sufficiently stabilized after pressurization to meet the criteria required for starting a pressure change leakage rate test.

For the pressure change leakage rate test of a large volume system, the water vapor partial pressure of the internal gas is usually determined with the system:

Dewpoint temperature and steam tables.

Dewpoint temperature and percent relative humidity.

Drybulb temperature and steam tables.

Drybulb temperature and percent relative humidity.

For pressure change measurement tests of large volume evacuated systems exposed to ambient temperature and weather variations during testing, it is difficult to determine a true leakage rate because of the:

Effect of outgassing vapors that do not obey the general gas laws for ideal gases.

Trapped air pockets behind welds inherent in most vacuum systems.

Large physical change in volume caused by the expansion and contraction of the system.

The effect of the back streamed pump oil and other numerous hydrocarbons present in vacuum systems.

When a liquid U tube manometer is used to measure gage pressure for a pressure change measurement test, the pressure should be read at the difference in the liquid level in both columns of the manometer. The pressure should never be read as double the reading of the liquid height in one column for which of the following reasons?

At zero gage pressure, the manometer liquid may not have been adjusted to zero on the scale.

On a hot day, the manometer fluid (particularly water) may evaporate during a long duration test, changing the original zero scale reading at zero gage pressure.

After pressurizing a system for a pressure change measurement test, before starting the test the pressurizing line should be disconnected from the system isolation valve in order to:

Prevent possible inleakage from the pressurizing line in the event of a leak through the seat of the isolation valve.

Allow the seat of the isolation valve to be bubble emission leak tested.

Prevent possible outleakage from the seat of the isolation valve in the event it is leaking.

For pressure change measurement test systems where the pressure is measured with a mercury manometer, for the most consistent test results the pressure reading point for the manometer should be at:

The midpoint of the meniscus slope.

Any point on the meniscus as long as it is always in the same position.

When the test results for a pressure change measurement test are on the borderline of being within the specified allowable, the most economical next step would be to:

Continue the test since the more reliable and more accurate results of a longer test may be within the allowable.

Immediately vent the system, perform another leak location test and repeat the pressure change test.

Perform the pressure change test again the following day using a different pressure gage.

For pressure change measurement test systems where the pressure is measured with a water manometer, for the most consistent test results the pressure reading point for the manometer should be at:

The midpoint of the meniscus slope.

Any point on the meniscus so long as it is always in the same location.

The pressurizing gas used for pressure change measurement tests of pressurized systems should always:

Be capable of supporting human life.

be capable of supporting combustion,

Contain a small amount of water vapor in order to validate dewpoint sensor readings.

PRESSURE CHANGE MEASUREMENT TESTING METHOD I

Authored by Sang Quang

Engineering

7th Grade

Used 6+ times

PRESSURE CHANGE MEASUREMENT TESTING METHOD I

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A pressure change measurement test performed at a pressure above atmospheric pressure is also referred to as a:

pressure hold test

Pressure decay test.

pressure loss test,

Any of the above.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Gage pressure plus barometric pressure is:

absolute pressure,

Atmospheric pressure.

Differential pressure.

Partial pressure.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Standard atmospheric or barometric pressure at sea level is equivalent to:

29.96 in. Hg.

14.7 psia.

760 mmHg.

All of the above.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A pressure of 66 psig, in terms of absolute pressure at sea level and standard temperature, would be about:

96 psia,

80.7 psia.

51.3 psia.

36 psia,

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When reading an ordinary pressure gage, the value indicated will be the:

Partial pressure.

Incremental pressure.

Gage pressure.

Absolute pressure.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A pressure change measurement test of a very large volume structure, such as a nuclear containment system, is usually referred to as a:

Leakage rate test.

Verification test.

Mass flow test.

Structural integrity test.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following gases is most practical as the pressurizing medium for a pressure change measurement test?

Argon.

Hydrogen.

Air.

All of the above.

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PRESSURE CHANGE MEASUREMENT TESTING METHOD I

A pressure change measurement test performed at a pressure above atmospheric pressure is also referred to as a:

Gage pressure plus barometric pressure is:

Standard atmospheric or barometric pressure at sea level is equivalent to:

A pressure of 66 psig, in terms of absolute pressure at sea level and standard temperature, would be about:

When reading an ordinary pressure gage, the value indicated will be the:

A pressure change measurement test of a very large volume structure, such as a nuclear containment system, is usually referred to as a:

Which of the following gases is most practical as the pressurizing medium for a pressure change measurement test?

Surface thermometers for a pressure change measurement test may be held on the test surface with:

The Pascal (Pa) is the:

As the elevation above sea level increases, the barometric pressure:

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