BLRS 6033 - Basic Fittings for Steam Boilers (Chp 5)

Question 1

The purpose of the “pipe siphon”installed between the boiler and the pressure gauge is to prevent:

A) Air from entering the gauge
B) Water from entering the gauge
C) Air from entering the boiler
D) Hot steam from entering the gauge
E) Hot steam from entering the boiler

Answer 1

D) “HOT STEAM”from *ENTERING THE GAUGE”

Question 2

LP steam boilers must be equipped with a marker indicating the:

A) Maximum water level line
B) Lowest permissible water line
C) Lowest visible water line
D) Low water fuel cut-off line
E) Fireline

Answer 2

B) Lowest “permissible” water line

Question 3

If a “gauge glass breaks”, the operator shall immediately:

A) Add more water to the boiler
B) Shut the boiler down
C) Lift the safety valve
D) Shut off the steam valve and water valve on the gauge
E) Shut the fuel valve

Answer 3

D) Shut off the “steam valve” and “water valve” on the gauge

Note: steam valve and water valve

Question 4

The “try lever test” should be done and recorded in the log book:

A) Monthly
B) Daily
C) At the beginning of each shift
D) Weekly
E) Annually

Answer 4

A) Monthly

Question 5

A “disadvantage” of a gauge glass safety-shutoff valve is it:
A) Cannot be blown down
B) Requires more maintenance
C) Cannot withstand high pressure
D) Makes gauge glass replacement more difficult
E) Cannot prevent water loss

Answer 5

B) Requires “more maintenance”

Question 6

What is the “first step” in replacing a “broken gauge glass” tube after securing proper PPE?

A) Close the gauge glass isolators and open drain
B) Lower boiler level below the glass
C) Isolate the boiler
D) Open the water column drain valve
E) Shut off the feedwater

Answer 6

A) “Close the gauge glass” isolators and open drain

Question 7

The “try lever test” is performed by:

A) Bypassing the high pressure limit control
B) Raising boiler pressure to MAWP
C) Shutting the boiler stop valve
D) Manually lifting the safety valve off of its seat
E) All of the above

Answer 7

D) “MANUALLY LIFTING”the safety valve off of its seat

Question 8

Boiler outlet valves are usually:

A) Gate valves because of their low resistance to flow
B) Globe valves because of their low flow resistance
C) Installed in tandem
D) Globe valves because of their throttling capability
E) Gate valves because of the ability to control flow

Answer 8

A) “GATE VALVES” because of their “low resistance to flow”

Question 9

On LP boilers, the try lever test “SHOULD NOT BE ATTEMPTED “ “unless the boiler”:

A) Is at MAWP (maximum allowable working pressure)
B) Is up to temperature
C) Is at least 75% of MAWP
D) The boiler has been blown down
E) Pressure is at least 34 kPa (5 psi)

Answer 9

E) Pressure is at least 34 kPa (5 psi)

Question 10

When testing the boiler pressure gauges using a Test Gauge:

A) Any error is compensated for mathematically
B) The boiler must be out of service
C) A single test gauge can be used for all different pressures
D) The gauge should be equipped with a check valve
E) Can be done while the boiler is in service

Answer 10

E) Can be done while the “BOILER IS IN SERVICE”

Question 11

Gauge glass rupture may be caused by:

A) A cold draft
B) Maximum allowable boiler pressure
C) Warming the boiler up too quickly
D) Improper boiler water treatment
E) A sudden pressure drop

Answer 11

A) A COLD DRAFT

Question 12

The force of the steam pressure acting on the “safety valve disc” is a function of:

A) Blowdown ring diameter
B) Seat diameter
C) Huddling chamber volume
D) Percent valve opening
E) Disc area

Answer 12

E) Disc area

Question 13

“Try cocks” are used to:

A) Check the level of water in the boiler
B) Isolate the gauge glass quickly
C) Check the pressure of the water in the column
D) Blow down the water column
E) Check the temperature of the water in the column

Answer 13

A) Check the LEVEL OF WATER in the boiler

Question 14

When replacing a gauge glass that uses “O” rings, tighten the packing nuts:

1. Under pressure
2. With a wrench
3. One after another
4. Alternately

A) 3 & 4
B) 2 & 3
C) 1 & 4
D) 2 & 4
E) 1 & 3

Answer 14

D) 2 & 4 (With a WRENCH and ALTERNATELY)

Question 15

Some steps involved in performing the “pop” test are:

A) Record the pressure at which the valve lifts off of its seat
B) Bypass the high pressure limit switch
C) Close the discharge valve
D) Close the feedwater inlet
E) All of the above

Answer 15

E) All of the above

Record,Bypass,Close,Close

Question 16

A function of a Bourdon tube gauge hairspring is to:

A) Keep the pointer at zero
B) Return the tube to its zero position
C) Return the pointer to zero
D) Eliminate backlash
E) Eliminate pointer linearity

Answer 16

D) Eliminate backlash

Question 17

When replacing a gauge glass tube after the glass has been isolated and cooled:

A) Remove the guard
B) Remove the packing and broken glass
C) Loosen the packing nuts
D) Slowly warm the glass
E) Install the glass

Answer 17

A) Remove the guard

Question 18

The “BLOWDOWN RING” on a safety valve is used to adjust:

A) The amount of continuous blowdown as required to control boiler water contaminants
B) The amount of time that the relief valve is open
C) The difference between the pressure at which the valve opens and the pressure at which the valve closes
D) The difference between the temperature at which the valve opens and the temperature at which the valve closes
E) The maximum pressure to open the relief valve

Answer 18

C) The difference between the “PRESSURE” at which the valve opens and the “PRESSURE” at which the valve closes

Note: Its Pressure Not Temperature