Equations LVL 1

Question 1

Natural Gas Formula

Answer 1

1CH4+2o2+8N2=1Co2+2H20+8N2

Question 2

Propane Gas formula

Answer 2

1C3H8+5o2+20N=3co2+4H2O+20N

Question 3

lbs for CO2 Variables

Answer 3

117 NG and 135 Propane

Question 4

LBS of C02 equation

Answer 4

(variable/1,000,000) x BTU input

Question 5

% of C02

Answer 5

CO2/ total dry gases X100 (Don’t multiply by 100 if you do not want percent)

Question 6

% of 02

Answer 6

02/ total dry gases X100 (Don’t multiply by 100 if you do not want percent)

Question 7

What is the first equation for on the Gas formulae sheet

Answer 7

Q=CFM x 1.2 x deltaT
DFMUA for BTU

Question 8

Steps for finding water produced

Answer 8

Divide BTU by CV (1000 or 2500)
Multiple by H20 produced (4 for propane 2 for NG)
divide by expansion ratio (1700)
Multiply by Us gal or Imperial Gas (7.48 US gal 6.24 Imperial Gal)

Question 9

Absolute Zero

Answer 9

460 and 273

Question 10

Atmospheric pressure

Answer 10

14.73 or 101.325

Question 11

Second equation in Gas formulae sheet

Answer 11

Orifice flow (In gas code)
Q=flow
K factor
Area
delta P pressure drop across burners (Psi or “w.c)
SG- Specific gravity (.6 or 1.51)
(1psi is 27.08 inches water column)

Question 12

How many Inches water column is 1 PSI

Answer 12

27.7

Question 13

What is the variable change equation for orifice flow

Answer 13

Q2/Q1= K2/K1 X A2/A1 X square rootDeltaP2/DeltaP1 X squarerootSG1/SG2
Notice SG is flipped*

Question 14

Expansion Of NG

Answer 14

600

Question 15

Expansion of Propane

Answer 15

270

Question 16

Expansion rate for steam to water

Answer 16

1700

Question 17

How to transpose the orfice flow equation easily

Answer 17

Q divided by full equation = what your looking for

Question 18

Third equation on list is for what

Answer 18

Clocking a meter
Q= Flow rate (Multiply but CV to get BTU)
t=rotation time in seconds
v-Dial size
PL- inlet pressure
PA- Sea level pressure
PS- Sea level pressure
TA 60 degrees
TS- Absolute
TA(bottom) Gas Temp
T- Absolute

Question 19

Imperial gal

Answer 19

6.24

Question 20

US Gal

Answer 20

7.48

Question 21

Forth Equation on Gas formulae sheet

Answer 21

P1 X V1 / T1 = P2 X V2 / T 2 OR
P1 X T2 X V1 = P2 x T1 X V2

Question 22

DFMUA Velocity equation

Answer 22

Velocity= T1 plus absolute / T2 plus absolute
muliplied by V2

Question 23

Correction temp equation

Answer 23

60 plus absolute / wrong temp plus absolute
(460 or 273)

Question 24

Correction pressure equation

Answer 24

wrong press + absolute / absolute
(14.73 or 101.325)

Question 25

Fifth equation on gas formulae sheet

Answer 25

Velocity = 4005 X squareroot of deltaP

Question 26

How many Oz in a pound

Answer 26

16

Question 27

Sixth equation on the formula sheet

Answer 27

Theoretical Natural Draft Ts- average stack temp plus absolute (460 or 273) Ta- Ambient temp plus absolute H Height of chimney

Question 28

Excess air dry reading equation

Answer 28

0.895 X %A / 0.21 - %A

Question 29

Excess air wet reading equation

Answer 29

1.105 x %B / 0.21 - %B

Question 30

Seventh Equation on gas formulae sheet

Answer 30

Velocity= Volume / area

Question 31

Latent heat of water to ice

Answer 31

144

Question 32

Latent heat of water to steam

Answer 32

970.4

Question 33

Calculating a state change from water to ice

Answer 33

144 X weight

Question 34

Calculating a state change from water to steam

Answer 34

970.4 X weight

Question 35

Eighth equation on gas formulae sheet

Answer 35

Area = Diameter squared X 0.7854 Or D= squareroot of area / 0.7854

Question 36

Turn down ratio calculation

Answer 36

high fire / low fire or max temp - min temp divied by min rise

Question 37

Calculation temperature change in water/ice/steam

Answer 37

specific heat X weight in lbs X DeltaT

Question 38

Specific Gravity of NG

Answer 38

0.6

Question 39

Specific gravity of Propane Vapour

Answer 39

1.51

Question 40

Specific gravity of Propane Liquid

Answer 40

1.51

Question 41

Calculation Net stack

Answer 41

Stack temp minus ambient temp

Question 42

Flow increase on Diameter change

Answer 42

D2 ^2.623 divided by D1 ^2.623 Multiple by 100 for a percentage

Question 43

Purge opening equation

Answer 43

square root D2/60 Cannot be less than 1/2"

Question 44

Purge Time

Answer 44

Length of pipe/200 X2(safety factor)

Question 45

Volume of pipe for purge calculation

Answer 45

Vol= (D/12)squared X .7854 X length

Question 46

Second page #1 equation on Gas formula sheet

Answer 46

Flow equation/Pipe sizing Q-Flow (multiple by CV for BTU) D-Diameter P1- (Service pressure plus absolute) Squared P2- (Pressure at end of pipe plus absolute)Squared L-Length

Question 47

How many cubic feet are in a pressure cyclinder

Answer 47

226

Question 48

Size of the cyclinder

Answer 48

1.5

Question 49

Normal flue temp

Answer 49

350-500

Question 50

Normal stack Velocity

Answer 50

.02-.16

Question 51

Third equation on Page 2 gas formulae sheet

Answer 51

LBS CO2 Variables 117 NG 135 Propane

Question 52

Converting square inches to square feet

Answer 52

Multiple by 144

Question 53

Forth equation on 2nd Page

Answer 53

Air free CO PPM

Question 54

Voltage triangle

Answer 54

E I R E-Volts I-Amps R-ohms

Question 55

Watts Triangle

Answer 55

P E I P-watts E-Voltage I-Ohms

Question 56

fifth equation on Page 2

Answer 56

PPm Nox

Question 57

Sixth equation on Page 2

Answer 57

Fuel Loss Ts- Fuel temp in C Ta Supply air temp Efficiency is 100 minus answer

Question 58

How to convert Miliamps to Amps

Answer 58

Divide by 1000

Question 59

Normal Hz of a motor

Answer 59

60 Hz

Question 60

Seventh equation on page 2

Answer 60

Motor speed

Question 61

Poles and RPMS

Answer 61

2-3600 4-1800 6-1200 8-900

Question 62

Ninth equation on page 2

Answer 62

Slip Ns- RPM NR-Rotar speed on motor

Question 63

Tenth Equation on Page 2

Answer 63

Torque PhP- Horse power n-RPM

Question 64

Page 3 1st equation

Answer 64

Torque in metric Pkw- Kilowatts n-RPM

Question 65

Page 3 second equation

Answer 65

Star circuit phase volt divide by coil is amps ephase X squareroot of3

Question 66

Page 3 3rd equation

Answer 66

Wye circuit Phase voltage / Coil amps is amps Line voltage / squareroot of 3 is volts

Question 67

Page 3 4th equation

Answer 67

Stunt resistance

Question 68

How to get BHP to BTU

Answer 68

multiple by 33475

Question 69

1 BHP is

Answer 69

34.5 LBS of 212 water or steam X LHV 970.4

Question 70

How many btu of 1 foot of 215 steam

Answer 70

240

Question 71

Hot many BTU is 1 foot of 170 water

Answer 71

150

Question 72

How much is pipe loss in an EDR

Answer 72

33%

Question 73

How to calculate gross EDR

Answer 73

Rad EDR multiply by piping

Question 74

What is net EDR

Answer 74

Just the Rad without the piping

Question 75

Equation for Wobbe

Answer 75

High heat Volume of gas divided by the squareroot of specific gravity

Question 76

How many air changed for a purge

Answer 76

4

Question 77

How much air has to be moving

Answer 77

60% of high fire

Question 78

How to calculate vol of container for purge time

Answer 78

(Diameter/12")squared X .7854 X length(Minus insinuation) Water Vol- lbs of water capacity / 62.4 Take body vol and minus water vol

Question 79

How to calculate Time for purge time

Answer 79

Fuel burners X 10ft X 1.2 (excess air) Divided by 3600 to get to sec Take vol of body(Multiply theby 4) and divide by fuel found in seconds divide by 60 %

Question 80

How to calculate available stack draft

Answer 80

theoretical draft X .80

Question 81

Calculating volume of flue gases going up chimney

Answer 81

First take BTU / CV Multiply that by your air needed and excess air then add gas back in Put variables in the t2 x v2 = t1 x t2 to get your volume than change volume in per min (Divide by 60) t2 x v2 = t1 x t2 T1-ambient temp plus absolute T2-Stack temp plus absolute V1-fuel + combustion air + excess air Make stack size into area (Stack size/12) sqaured X 0.7854 Vel= volume/area = Answer

Question 82

Equation to find deltaP using Velocity

Answer 82

DeltaP= (Velocity/4005) squared

Question 83

Steps for calculating Full Load RPM change

Answer 83

Use RPM equation with new HZ Use Slip equation with Old RPM Take the new RPM multiple by slip rating (Decimal) Take the new RPM and subtract the answer in step 3

Question 84

Expansion tank sizing

Answer 84

Coefficient of vol multiply by Volume of system Multiplied by Change in liquid temp

Question 85

Liquid gas into btu

Answer 85

Liquid divide by gal x 270 expansion x c.v

Question 86

Mixed fuel new flow

Answer 86

Q2 = q1(org) squareroot sg1(org)/sg2 (mix) Multiply by new c.v for btu

Question 87

Calculating new sg and cv with propane mix air and fuel

Answer 87

Take new gas % and multiply by c.v= new cv valve Take gas % and multiply by sg Take air % and multiply by one. Add the last two steps together and is your new sg