NJ High Pressure Black Seal Exam Flashcards

Questions and Answers

What ASME code symbol is used to denote a high pressure power boiler?

According to the regulation, a licensed operator on watch shall give constant attention and remain within sight and natural sound in both HP and LP boilers.

False

What is the range of capacity that a High Pressure Boiler Operator can be the Chief Engineer and work as Shift Engineer (stand watch) based on the 12:90 Boiler, Pressure Vessel and Refrigeration rules?

Can act as Chief Engineer and stand watch of a plant with a minimum capacity of 100 HP and up to 500 HP.

Any person found performing the duties of a license and holding an expired license shall be subject to what type of penalty?

They shall be subject to a min penalty of $500 up to a max of $5,000 per day. Signup and view all the answers

Pursuant to N.J.A.C. 12:90, what is the temperature and pressure that defines a high-temperature hot water heating boiler?

exceeds 250 degrees F at 160 psi Signup and view all the answers

Why are staybolts used in the construction of HRT power boilers?

to strengthen and support flat plates on a fire-tube boiler Signup and view all the answers

In a fire-tube boiler, how are the tubes usually attached to the tube sheet?

by rolling the tubes and beading the ends Signup and view all the answers

How are the tube sheets supported in a fire-tube boiler?

by the shell, stays, and tubes Signup and view all the answers

Where would you find downcomer tubes?

in water-tube boilers Signup and view all the answers

Why are baffles used in the steam drums of water-tube boilers?

to prevent the carry-over of water Signup and view all the answers

In the State of New Jersey, when is it permissible to have only one bottom blow off valve on a boiler?

when the MAWP does not exceed 100 psi Signup and view all the answers

The maximum size of the bottom blowdown line and the surface blowdown line is:

2.5 inches (2.5") Signup and view all the answers

N.J.A.C. 12:90 requires that sewer lines be protected from high temperatures and pressure coming from boiler blow-off lines. What device is used for this purpose?

a blowdown tank Signup and view all the answers

By N.J.A.C. 12:90 rules, what is the minimum thickness allowed for an atmospheric type blowdown tank?

5/16 inch Signup and view all the answers

What effect would frequent blowing down of a boiler have on the system?

blow down heat loss Signup and view all the answers

When a low-water fuel cutoff (LWFCO) has activated on a hot water heating boiler what shall happen?

Operation of the LWFCO shall cause a safety shutdown and lockout, requiring a manual reset Signup and view all the answers

Which of the following valves is used in a steam feedwater supply line to control the direction of fluid flow and prevent backflow in a system?

check valve Signup and view all the answers

What is the basic function of the low water cut-off device?

to shut off fuel supply to the burner Signup and view all the answers

What is the proper procedure for returning a gauge glass to service after installing a new glass?

open the drain and crack open the top valve Signup and view all the answers

Which of the following is the proper method for testing a low-water cut-off device on a steam boiler?

lower the water level in the boiler until the burner shuts down Signup and view all the answers

By ASME code, the size of the water column connections to a boiler must be a minimum of:

1 inch Signup and view all the answers

Which of the following could cause a tube in a high-temperature hot water boiler to overheat?

poor circulation Signup and view all the answers

What would occur if there was a drop in the velocity of the liquid flowing through a heat exchanger?

the temperature of the liquid would increase Signup and view all the answers

An operator must be familiar with how water pressure works and the basic concepts that determine pressure head. Therefore, a column of water 1-inch square and 1-foot high weighs how much?

0.433 lbs Signup and view all the answers

Most steam boilers are equipped for the gauge glass and water column to be blown down. Generally, the operating rules recommend that the water column and gauge glass be blown down:

once a day Signup and view all the answers

What will excessive oxygen in the boiler water cause to take place?

pitting of boiler metal Signup and view all the answers

As solids and alkalinity in boiler water increase:

waterside scale is increased Signup and view all the answers

What chemical would be used to control scale in a low pressure boiler?

phosphate Signup and view all the answers

What water treatment chemical is used to control alkalinity in boiler feedwater?

caustic soda Signup and view all the answers

What should new or re-tubed boilers be cleaned with?

an alkaline detergent solution Signup and view all the answers

On a pH scale what number would represent the most acidic of a solution of feedwater?

the most acidic is 0 Signup and view all the answers

Which of the following would cause scale to form in a low pressure boiler?

Calcium and magnesium Signup and view all the answers

What chemical should be added to boiler feedwater to prevent oxidation of the boiler drum and tubes?

sodium sulfite Signup and view all the answers

Where is caustic embrittlement most likely to occur?

on a riveted joint below the water line Signup and view all the answers

In a boiler plant system, what is the measure of the degree of acid or base of a solution called?

This would be called the pH level Signup and view all the answers

A three-element feedwater regulator is controlled by what means?

steam flow, feedwater flow, and drum level Signup and view all the answers

A two-element feedwater control device responds to the boiler drum level and feedwater flow.

False Signup and view all the answers

What is the function of a vent condenser on a deaerating feedwater heater?

to condense steam that would escape through the vent Signup and view all the answers

Which statement best describes the operation of a closed feedwater heater?

the steam and water do not mix Signup and view all the answers

What condition would cause a feedwater pump to become vapor bound?

the feedwater temperature is too hot Signup and view all the answers

A thermal expansion feedwater regulator operates by:

the expansion and contraction of a thermostatic element Signup and view all the answers

A two-element feedwater regulator is controlled by what means?

water level and steam flow rate; or also, feedwater flow computer; feedwater flow mode transfer station Signup and view all the answers

What device is used on a deaerator to prevent water from backing up into the steam line?

an overflow device Signup and view all the answers

While making a round of your boiler room, the boiler feedwater pump is making a strange noise. The pump casing and the temperature of the water has risen above normal. What would most likely cause this problem?

pump cavitation issue Signup and view all the answers

When taking over a shift, the boiler operator must first check:

water level on all boilers online by blowing down the water column and gauge glass Signup and view all the answers

On a boiler feedwater line, what type of valve is used closest to the boiler?

stop valve Signup and view all the answers

What would one standard atmosphere at 14.7 psi be equivalent to in feet of water?

34 feet Signup and view all the answers

In your boiler plant you have pumps that are used for numerous applications. One of the pumps has a small amount of liquid coming from the packing gland. Is this normal or is it a problem?

this is normal and is necessary to lubricate and cool the packing. Signup and view all the answers

Study Notes

High Pressure Boiler Regulations and Licensing

ASME code designates the symbol "S" for high pressure power boilers.
In New Jersey, licensed operators on watch must remain within sight and sound of both high pressure (HP) and low pressure (LP) boilers—this statement is false.
Chief Engineers in New Jersey can oversee plants with a minimum capacity of 100 HP and up to 500 HP.
Operating a boiler with an expired license incurs penalties ranging from a minimum of $500 to a maximum of $5,000 per day.

Boiler Classification and Construction

High-temperature hot water heating boilers exceed 250°F at 160 psi.
Staybolts reinforce and support flat plates in fire-tube boilers.
Tubes in fire-tube boilers are usually attached to the tube sheet by rolling and beading the ends.
Tube sheets are supported by the shell, stays, and tubes.

Boiler Components and Their Functions

Downcomer tubes are found in water-tube boilers; baffles in steam drums prevent water carry-over.
In New Jersey, only one bottom blow-off valve is allowed on boilers with a maximum allowable working pressure (MAWP) not exceeding 100 psi.
Bottom and surface blowdown lines have a maximum size of 2.5 inches.
Blowdown tanks are required by N.J.A.C. 12:90 to protect sewer lines from high temperatures and pressures caused by boiler blow-off lines.

Safety and Maintenance Devices

The low-water fuel cutoff (LWFCO) should trigger a safety shutdown requiring a manual reset if activated on a hot water heating boiler.
Check valves control fluid direction and prevent backflow in steam feedwater supply lines.
The basic function of a low water cut-off device is to shut off the fuel supply to the burner.
Proper procedure for returning a gauge glass to service includes opening the drain and cracking open the top valve.

Operational Procedures and Effects

Testing a low-water cut-off device necessitates lowering the water level until the burner shuts down.
Water column connections to a boiler, per ASME code, must have a minimum size of 1 inch.
Poor circulation can cause overheating in high-temperature hot water boilers.

Water Treatment and Chemical Management

A column of water 1-inch square and 1-foot high weighs 0.433 lbs, crucial for understanding pressure head.
Frequent blowing down of a boiler results in blowdown heat loss; excessive oxygen in boiler water can lead to pitting of boiler metal.
Scale in boiler water increases with rising solids and alkalinity, and calcium and magnesium are primary causes of scale formation.
Phosphate is used to control scale in low pressure boilers, while caustic soda manages alkalinity in boiler feedwater.

Boiler Chemistry and pH Management

New or re-tubed boilers should be cleaned with an alkaline detergent solution.
The most acidic solution on a pH scale is represented by the number 0; a pH level measures the degree of acidity or basicity in solution.
Sodium sulfite is added to feedwater to prevent oxidation of the boiler drum and tubes, addressing caustic embrittlement, often found in riveted joints below the waterline.

Feedwater Management Systems

Three-element feedwater regulators respond to steam flow, feedwater flow, and drum level; two-element regulators respond to boiler drum level and steam flow rate.
Vent condensers on deaerating feedwater heaters condense steam to prevent loss, while in closed feedwater heaters, steam and water do not mix.
A feedwater pump may become vapor bound if feedwater temperature is excessively high.
Thermal expansion feedwater regulators operate through the expansion and contraction of a thermostatic element.

Operational Considerations for Boiler Rooms

An overflow device prevents water backing up into the steam line in deaerators.
A typical noise and elevated temperature from a feedwater pump indicate a cavitation issue.
Before shift changes, operators should check water levels in all online boilers by blowing down the water column and gauge glass.
The stop valve is positioned closest to the boiler on feedwater lines.
One standard atmosphere (14.7 psi) correlates to approximately 34 feet of water pressure.

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Prepare for the NJ High Pressure Black Seal Exam with these informative flashcards. Each card presents essential questions and answers related to ASME codes and regulations for high pressure boilers. Strengthen your understanding and readiness for the exam with key concepts and facts.