Chemistry Quiz: Fuel Analysis and Boiler Water

What does the Total Acid Number (TAN) of marine distillates and residual fuels indicate?

What is the main implication of a low pH in boiler water?

What is the main implication of HFO viscosity being out-of-limit?

What is the main implication of HFO flashpoint being out-of-limit?

What is the immediate implication of HFO pour point being out-of-limit?

What is the remedy for out-of-limit HFO pour point?

In the fuel oil service system, what is the relationship between the flow through the flowmeter and the flow through the pressure control valves?

What happens to the flow through the pressure control valves when the engine speed increases?

What is the relationship between the viscosity of the fuel oil and the temperature of the fuel oil?

What is the primary concern if the CCAI of HFO is out-of-limit?

What would you use to confirm the absence of power supply after switching off the circuit breaker?

What is current in an electric circuit?

TAN of marine distillates and residual fuels is expressed in KOH, an alkaline or base
It indicates the amount of base required to neutralize the acid present in the oil

If pH of boiler water is out-of-limit (low), it may lead to: • Scale formation • Corrosion and iron deposits • Reduced heat transfer
If HFO viscosity is out-of-limit, the main implication is poor atomization, and the remedy is to increase fuel oil temperature
If HFO flashpoint is out-of-limit, the main implication is safety concerns (fire and explosion), and the remedy is to use flashpoint-increasing additives or temperature control
If HFO pour point is out-of-limit, the immediate implication is pumping issues, and the remedy is temperature control or blending with lower pour point fuels

The volume of fuel oil that flows through the flowmeter is the same volume that is not flowing through the pressure control valves
When engine speed increases, the flow through the circulating pump reduces, but the flow through the supply pump increases

If CCAI of HFO is out-of-limit, the primary concern is ignition delay, and the remedy is to use ignition improver additives
If ash is out-of-limit in HFO, the primary implication is equipment wear and maintenance, and the remedy is fuel filtration and treatment

To confirm the absence of power supply after switching off the circuit breaker, use a voltmeter
Current is the flow of electrons around a circuit
Voltage is the pressure that pushes an electric current to conduct more power from an electric circuit