Commission Fuel Train Components & Commission ICI Burners

Question 1

Where can you find Recommended procedure for initial start-up of high input equipment (over 400 000 Btuh (120 kW)).

Answer 1

B149.3 Annex A

Question 2

You can use jumpers or change electrical connections easily for which valves

Answer 2

electric and electro-hydraulic valves.

Question 3

Where to find A test firing valve shall in the codes

Answer 3

B149.3 - 6.2

Question 4

What does a Valve Proving System

Answer 4

cycle the valves and monitor pressures automatically at the beginning of each cycle

Question 5

If you do a Valve-Proving System is it an alternative to the annual valve seat bubble test.

Answer 5

Don’t consider a Valve-Proving System an alternative to the annual valve seat bubble test.

Question 6

The pressure regulator shall be capable of maintaining an outlet pressure to within what percent above or below the regulator set pressure during burner operation from minimum to maximum firing rates.

Answer 6

10

Question 7

When the inlet supply pressure to the pressure regulator is in excess of what pressure, the pressure regulator shall be a lock-up (positive shut-off pressure regulator).

Answer 7

0.5 psig (3.5 kPa)

Question 8

When do you need a Over Pressure Protection (OPP)

Answer 8

Downstream components are not rated for the regulator inlet pressure

Question 9

What should a high gas pressure switch be set to

Answer 9

the setpoint shall be set to not more than 125% of the normal operating pressure at the maximum firing rate.

Question 10

What should a low gas pressure switch be set to

Answer 10

50% of the lowest normal operating pressure

Question 11

Where is the low gas pressure switch installed

Answer 11

downstream of the pressure regulator where used and upstream of the safety shut-off valve or valves and upstream of the flow control valve

Question 12

Where do you find the information on how to set your low and high gas pressure switches in the codes

Answer 12

B149.3 clause 12.5.2 and 12.5.1

Question 13

When is the lowest normal operating pressure

Answer 13

will be while the burner is at high fire and the regulator is experiencing its maximum allowable droop

Question 14

When do you adjust the position of the flow control valve

Answer 14

Position of the flow control valve must be adjusted for the different firing rates

Question 15

What do you use to set the flow control valve

Answer 15

A combustion analyser

Question 16

Is The cam is not part of the valve train

Answer 16

No but it directly controls the position of the input flow control valve

Question 17

Flow control valve, When making fuel adjustments set and lock what

Answer 17

the high fire and low fire stops on the overtravel linkage

Question 18

Where you you find guidelines on electronic type fuel/air ratio control systems).

Answer 18

see Annex D in the code

Question 19

What is another name for a Parallel Position system

Answer 19

FARC

Question 20

What does FARC stand for

Answer 20

Fuel Air Ratio Control

Question 21

How does a FARC system work

Answer 21

The individual actuators facilitate precise adjustment to a single valve or damper position without affecting the position of other components

Question 22

What tells the control valves exact position at all times in the FARC system

Answer 22

actuators

Question 23

Butterfly Valves that are driven directly by the actuator will not have what

Answer 23

overtravel linkage on the butterfly valve

Question 24

What is an oil block

Answer 24

Several oil valve train components can be combined into an “oil block” that looks like a single device

Question 25

In an oil block how do you make adjustments

Answer 25

Each component is adjusted individually

Question 26

On an oil burning system If you start running out of fuel at high fire check what

Answer 26

Fuel filter

Question 27

On an oil burner system The pump can be mounted where

Answer 27

on the appliance or can be located further upstream in the piping.

Question 28

How is Nozzle pressure is maintained in an oil burner system

Answer 28

by adjusting the bypass regulator, (essentially acting as a relief/overpressure valve).

Question 29

For the oil burner the SSOV’s are typically what kind of valve

Answer 29

normally closed solenoid valves piped in series but wired in parallel

Question 30

What are designed for precise control of the fuel oil

Answer 30

metering valves

Question 31

On linkage systems prioritize which adjustments then what after

Answer 31

the air damper linkage for the combustion setting of the primary fuel. Next adjust the secondary fuel to the linkage positions of the air damper

Question 32

A gas safety officer will need what when you go to commission a unit

Answer 32

Customer name, company site name and address. They can use this information to see if permits were pulled for the piping and/or appliance. Manufacturer and type of appliance.

Question 33

A boiler safety officer will need what when you go to commission a unit

Answer 33

Customer name, company site name and address. Manufacturer and type of appliance. The CRN# (The CRN# will give you a complete history of the boiler, from the manufacturer to the present).

Question 34

Complete combustion analysis throughout entire burner curve every what percent

Answer 34

10

Question 35

Adjust the line pressure regulator according the specifications or the rating plate. For pilot-operated regulators where do you adjust

Answer 35

the adjustment is done at the pilot regulator.

Question 36

How do you set the initial airflow (what is it based on)

Answer 36

Set the initial airflow based on the calculated combustion air requirements.

Question 37

What is Primary air

Answer 37

the amount of air supplied to achieve stoichiometric combustion

Question 38

What is Excess air

Answer 38

the amount of air supplied beyond the stoichiometric requirements for complete combustion

Question 39

What percent of excess air should you try to achieve

Answer 39

achieve around 3% to 5% excess air

Question 40

Which regulator has essentially just two adjustments, high and low fire,

Answer 40

Zero governor

Question 41

What is used to adjust high fire in a zero governor

Answer 41

A limiting orifice

Question 42

What is used to adjust low fire in a zero governor

Answer 42

regulator's gas diaphragm cover plug and use a screwdriver to turn the spring adjusting plug

Question 43

What can be used if the combustion chamber is negative or positive affecting the burner

Answer 43

An impulse line

Question 44

Make sure your supply pressure regulator is set for at the least

Answer 44

sat least the minimum pressure required.

Question 45

How to calculate your supply pressure minimum

Answer 45

Air pressure 28 in Pressure drop through regulator 3 in Safety factor 2 in Required supply pressure = 33

Question 46

How is The barometric damper is set

Answer 46

for the desired draft conditions using weights and adjustment screws/bolts.

Question 47

If the draft is too low on a barometric damper what do you do

Answer 47

Add weight

Question 48

How can you adjust draft without a barometric damper

Answer 48

Draft could be controlled by installing a restriction in the stack More often the installed restriction will be adjustable like this damper (internal damper).

Question 49

What is the FGR inlet box

Answer 49

pulls flue gas from the stack and delivers it to the combustion air fan inlet.

Question 50

What is the FGR flow control damper

Answer 50

It is a single blade damper designed for high temperature operation.

Question 51

What does the FRG flow control damper do

Answer 51

The flow control damper is designed to regulate the quantity of flue gas to the FGR inlet box.

Question 52

How is the FRG flow control damper moved

Answer 52

It is driven by a damper actuator.

Question 53

Due to the wide variation of duct operating temperature what must be added

Answer 53

expansion joints must be provided in the ductwork. gasketing at duct joints

Question 54

Why should the FGR duct be insulated

Answer 54

to prevent accidental burns where installation locations so require

Question 55

FGR ducting should be sized such that the pressure drop between the stack and burner inlet does not exceed ? w.c.

Answer 55

1

Question 56

The FGR line should be connected to the stack where

Answer 56

breaching before (upstream of) any boiler outlet damper, draft control damper, or barometric damper.

Question 57

If the temperature and/or pressure variations in the boiler room cannot be controlled sufficiently to allow repeatable operation of the burner then what is needed

Answer 57

the addition of control components such as oxygen trim may be required.

Question 58

When allowed to cool, these gases may condense, particularly at any low points in the system what is needed because of this

Answer 58

Provisions to drain this condensate may need to be made to prevent its collection.

Question 59

What is the FGR Ducts Temperature Switch for

Answer 59

used to shut down the burner in the event the temperature in the ductwork exceeds some maximum set point.

Question 60

Usually how is the FGR damper set

Answer 60

Fully open at high fire

Question 61

Stack temperature switch should be set at what temperature

Answer 61

a few degrees below the normal low fire stack temperature (approximately 200° F).

Question 62

on loss of FG flow at all firing rates what should happen

Answer 62

The FGR flow proving switch must be set to shut down the burner

Question 63

The FGR duct temperature switch should be set at what temperature

Answer 63

200°F over the high fire stack temperature (this may be a non-adjustable switch).

Question 64

When setting FGR rates two emissions analyzers are required why

Answer 64

One must be used to monitor the stack O2 levels, CO, and NOX emissions. The other analyzer should be used to observe the oxygen content in the burner housing, which is an indication of FGR level.

Question 65

the low-fire setting of the FGR damper is typically what

Answer 65

fully closed

Question 66

If the NOx at low fire is too high what can be done

Answer 66

the characterized linkage or FGR valve servo can be adjusted to open the damper allowing more FGR into the system.

Question 67

Too much FGR can cause what

Answer 67

instability and combustibles (CO or smoke)

Question 68

Too little FGR can cause what

Answer 68

high NOx and combustion noise