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High output Gas > Line B Mechanical Safety Devices > Flashcards

Line B Mechanical Safety Devices Flashcards

1
Q

Referring to Figure 1, What is this is the ASME symbol for?

A

Power boiler safety valve

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2
Q

Referring to Figure 2, What is this is the ASME symbol for?

A

Heating boiler relief valve

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3
Q

Referring to Figure 3, What is this is the ASME symbol for?

A

Unfired pressure vessel safety valve

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4
Q

Referring to Figure 4, What is this is the ASME symbol for?

A

Unfired pressure vessel rupture disc

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5
Q

Who can repair and set pressure relief devices?

A

Organizations authorized by the regulatory authority

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6
Q

What three things must be done to a safety valve to show it has been reserviced by an authorized service organization?

A

a. Affix a dated service nameplate to the reclosing pressure relief device
b. Use a uniquely embossed seal to seal all adjustable parts
c. Ensure the manufacturer’s nameplate remains on the relief device

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7
Q

What is the recommended time interval for a pressure relief device to be tested?

A

12 months

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8
Q

What is the recommended time interval for a pressure relief device to be serviced?

A

3 to 5 years

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9
Q

What type of opening characteristics does a Safety Valve have?

A

Pop opening from pressure

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10
Q

What type of opening characteristics does a Relief Valve have?

A

Gradual opening from pressure

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11
Q

Where is the Rupture Disk commonly installed on a boiler?

A

Upstream in series with a relief valve

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12
Q

The set point on a safety valve can be greater than the Maximum Operating Working Pressure (MAWP) of the vessel or piping.

TRUE / FALSE

A

FALSE

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13
Q

Referring to Figure 5, What type of vessel would you find this mechanical safety valve on?

A

High pressure steam boiler

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14
Q

Referring to Figure 6, What type of vessel would you find this mechanical safety valve on?

A

Unfired steam vessel

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15
Q

A 150 Psig 8,000 MBH boiler has a safety valve with a relief capacity of 8,350 lbs/hr. Can this safety valve safely relieve the boiler?

A

8000000/970 = 8274Lbs YES

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16
Q

What is the minimum relief capacity of a safety valve (in lbs/h) installed on a 150 Psig, 4,600 MBH steam boiler with an efficiency of 82%?

A

4600X33475/970 3888 lbs/h

17
Q

What is the minimum relief capacity of a safety valve (in lbs/h) installed on a 150 Psig, 400 Horse Power steam boiler with an efficiency of 79%?

A

400bhpX33475btu/970btu/lb 13,801-4 lbs/h

18
Q

A 150 Psig, 500 HP, 82% efficient steam boiler has two safety valves, one with a relief capacity of 6,576 lbs/hr and the other at 6,303 lbs/hr. Do the combined relief valves have enough capacity to relieve this boiler safely?

A

NO 500bhpX33475btu/970 btu per lbs = 17255 6576+6303=12879

19
Q

A safety relief valve inlet can be smaller than the boiler outlet it serves.

TRUE / FLASE

A

True

20
Q

The piping connected to the outlet of a relief valve can be reduced by what size?

A

The size cannot be reduced

21
Q

On a steam system, the safety valve must be installed in what orientation?

A

Vertically

22
Q

All attached discharge piping for a steam safety valve must be supported___________.

A

Independently supported

23
Q

What is best practice when the relief discharge piping from a safety valve is installed vertically to outdoors?

A

Install a drip pan elbow to allow moisture to drain away form the valve

24
Q

How many inches should the center-to-center distance from the drip pan elbow to the safety valve not exceed?

A

24 inches

25
Q

Referring to Figure 7, the slash in the discharge pipe should be cut at what angle?

A

45 degrees

26
Q

Referring to Figure 8, if the safety valve is 3 Inches in size, what must the bet he minimum size of the drain-open to waste pipe be?

A

3/8 inch

27
Q

What is the set relief pressure for a propane tank installed on a premise?

A

250 psi

28
Q

What is the set relief pressure for a propane tank installed on a vehicle?

A

312 psi

29
Q

What is the set relief pressure for a propane cylinder?

A

375 psi

30
Q

Where is the primary relief valve installed for a vehicle’s LNG tank?

A

To the top fill line

31
Q

Where is the secondary relief valve installed for a vehicle’s LNG tank?

A

To the vapour withdrawal line

32
Q

What is the primary relief valve discharge setting set to for a vehicle’s LNG tank?

A

Set at the MAWP of the tank

33
Q

What is the secondary relief valve discharge setting set to for a vehicle’s LNG tank?

A

1.5 times the MAWP of the tank

34
Q

Referring to the figure below, what must be done to the discharge of this relief valve?

A

Nothing

High output Gas (59 decks)

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