Flat Gauge Glass Safety Precautions
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Questions and Answers

What is the purpose of a boiler water level indicator?

  • To continuously measure and display water level (correct)
  • To regulate the temperature inside the boiler
  • To control the fuel supply to the boiler
  • To monitor the pressure of the steam generated

According to ASME BPVC I Part PG-60.1, how many gage glasses are required for boilers with a maximum allowable working pressure exceeding 400 psi (3 MPa)?

  • Three gage glasses
  • Two gage glasses (correct)
  • None, as these boilers use remote water level indicators instead
  • One gage glass

Why do boilers with a maximum allowable working pressure exceeding 400 psi require two gage glasses?

  • To reduce the risk of water level measurement errors
  • To comply with industry standards for high-pressure boilers
  • To provide a clearer view of the water level inside the boiler
  • To ensure redundancy in case one gage glass malfunctions (correct)

Which type of method includes gauge glasses for determining boiler water level?

<p>Direct method (A)</p> Signup and view all the answers

What is the minimum distance required between the lowest visible water level and the lowest permissible water level in a gage glass, according to ASME BPVC I Part PG-60.1?

<p>2 inches (50 mm) (C)</p> Signup and view all the answers

According to ASME BPVC I Part PG-60.1.1.1, what can be provided instead of one of the two required gage glasses?

<p>A remote water level indicator (C)</p> Signup and view all the answers

What is the purpose of the water column in relation to the gauge glass?

<p>To dampen agitation in the water and act as a reservoir (C)</p> Signup and view all the answers

What does ASME BPVC I Part PG-60.1 state regarding the lowest visible water level in a gage glass?

<p>It should be at least 2 in. (50 mm) above the lowest permissible water level. (B)</p> Signup and view all the answers

What causes eventual failure of tubular gauge glasses?

<p>High temperature chemically treated water (C)</p> Signup and view all the answers

What should be done if the gauge glass leaks when put into service?

<p>Close the steam and water valves on the gauge before tightening the nuts (B)</p> Signup and view all the answers

What type of gauge glass is used for higher pressures, exceeding about 3000 kPa?

<p>Flat gauge glass (D)</p> Signup and view all the answers

What does the discolouration of mica coating in a transparent gauge glass indicate?

<p>Failure of the mica, and that water is now directly contacting the glass (D)</p> Signup and view all the answers

Why does cracking open the steam valve and leaving the drain valve open heat the gauge glass slowly?

<p>To avoid sudden temperature changes (A)</p> Signup and view all the answers

Which type of gauge glass is suitable for temperatures exceeding 250°C and pressures up to 70,000 kPa?

<p>Transparent gauge glass (A)</p> Signup and view all the answers

What is indicated by the presence of armoured glass in transparent and reflex gauge glasses?

<p>Ability to withstand high temperatures (C)</p> Signup and view all the answers

What can cause a high water level in the gauge glass of a boiler, fooling both operators and controllers into believing the boiler is full of water?

<p>Blocked water connection piping causing condensate accumulation and obstructed return to the boiler (A)</p> Signup and view all the answers

What is the purpose of maintaining unobstructed water and steam connections to both a water column and a gauge glass in a boiler?

<p>To ensure proper communication of the boiler water level to the level instruments (A)</p> Signup and view all the answers

Under what conditions does ASME BPVC IV Part HG-604 prohibit isolation valves in steam heating boilers?

<p>When steam and water piping have isolation valves (D)</p> Signup and view all the answers

What is the recommended frequency for blowing down gauge glasses on smaller high-pressure boilers?

<p>Blow down every shift (D)</p> Signup and view all the answers

What should be done if gauge glasses become obscured by internal corrosion or deposits?

<p>They should be renewed (A)</p> Signup and view all the answers

What is the purpose of remote water level indicators in a boiler?

<p>To show the water level at a remote location (B)</p> Signup and view all the answers

According to ASME BPVC I Part PG-60.1.1.1, what is required if the water level in at least one gage glass is not readily visible to the operator?

<p>A combination of two independent continuous transmission and display of an image of the water level in a gage glass (B)</p> Signup and view all the answers

What happens when the drum level rises in the remote water level indicator shown in Figure 24?

<p>The diaphragm rises and moves the shutter upwards so more blue shows (C)</p> Signup and view all the answers

What keeps a constant head of water pressure on one side of the manometer shown in Figure 25?

<p>A condenser at the boiler drum (A)</p> Signup and view all the answers

What happens to the shutter in the remote level indicator shown in Figure 24 when the drum level drops?

<p>It moves upwards to show more red color (D)</p> Signup and view all the answers

What is used to transfer the optical image of the water level to the control area when it's not readily visible to the operator?

<p>A fiber optic cable or mirrors (C)</p> Signup and view all the answers

What happens to the pressure in the remote water level indicator when the level in the boiler steam drum is at a minimum?

<p>The pressure differential between the two heads will be the greatest. (D)</p> Signup and view all the answers

What is an advantage of a remote water level indicator?

<p>It has no moving mechanical parts. (B)</p> Signup and view all the answers

What is the purpose of dirt traps in a remote water level indicator?

<p>To prevent contamination of the indicating liquid. (A)</p> Signup and view all the answers

What can happen if indicating liquid is overfilled in a remote water level indicator?

<p>The indicated level will be too high. (A)</p> Signup and view all the answers

What do electronic remote water level indicators use to sense and transmit level?

<p>Various methods (D)</p> Signup and view all the answers

Where can one or more remote LED displays be located in a typical electronic water level gauge system?

<p>Up to three different locations (A)</p> Signup and view all the answers

What type of signal does a digital water level indicator receive from a drum level transmitter?

<p>Standard 4 to 20 mA signal (D)</p> Signup and view all the answers

How are positive or negative readings indicated in a loop-powered digital water level indicator?

<p>In millimetres (D)</p> Signup and view all the answers

"In order for any remote water level indicator to be used to meet the requirements of ASME BPVC I Part PG-60.1.1.1," what must it be designed and installed to meet?

<p>&quot;The requirements of ASME BPVC I Part PG-60.1.1.2&quot; (A)</p> Signup and view all the answers

What is monitored in real time by cameras transmitting information to a central control room?

<p>Water levels (B)</p> Signup and view all the answers

According to ASME BPVC I Part PG-60.1.1.2, what should not be excluded from being used as operator aids?

<p>Other remote indication devices like cameras and loop-powered indicators discussed (D)</p> Signup and view all the answers

What is the recommended method of tightening the nuts on the cover when replacing the flat gauge glass?

<p>Starting at the centre and tightening evenly on both sides (A)</p> Signup and view all the answers

Why is it recommended to never reuse old gauge glasses?

<p>Old glasses may have weakened glass surfaces (D)</p> Signup and view all the answers

What is the purpose of using molybdenum disulfide on the contact surfaces of the new glass during replacement?

<p>To allow the glass to slip into place easily (B)</p> Signup and view all the answers

What causes many gauge glass failures on high-pressure boilers?

<p>Inadequate heating of the new glass (C)</p> Signup and view all the answers

What does a bicolour gauge glass indicate with different colors for steam and water?

<p>The water level at a distance (C)</p> Signup and view all the answers

What is the purpose of connecting a hooded mirror to a bicolour gauge glass as shown in Figure 23?

<p>To reflect light to another mirror on the operating floor (B)</p> Signup and view all the answers

What is indicated by the presence of armored glass in transparent and reflex gauge glasses?

<p>Resistance to both mechanical and thermal shock (D)</p> Signup and view all the answers

What is indicated by a dark area in a reflex gauge glass?

<p>Water level in the gauge glass (A)</p> Signup and view all the answers

According to ASME BPVC I Part PG-60.1.1.1, what is required if the water level in at least one gage glass is not readily visible to the operator?

<p>Installation of mirrors for transferring optical image (A)</p> Signup and view all the answers

What type of gauge glass is suitable for temperatures exceeding 250°C and pressures up to 70,000 kPa?

<p>Armored-type gauge glass (C)</p> Signup and view all the answers

What does ASME BPVC I Part PG-60.1 state regarding the lowest visible water level in a gage glass?

<p>It should be slightly above the lowest permissible water level (D)</p> Signup and view all the answers

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