Jump to Navigation

Conversion Factors & Formulas

The following is a list of common conversion units and formulas that should help you answer any conversion or formula questions.

   CONVERSION UNITS 

Multiply                                                                               By                                                                        To Get

 To Get                                                                                By                                                                        Divide

BOILER HORSEPOWER                         34.5                                        LBS/HR OF STEAM

BOILER HORSEPOWER                       33,479                                      BTU/HR

CUBIC FEET                                             7.48                                        GALLONS

CUBIC FEET/MIN                                     62.43                                       LBS OF WATER/MIN

CUBIC FEET                                             1728                                        CUBIC INCHES

FEET OF WATER                                   0.4335                                      LBS/SQ IN

GALLONS                                                0.1337                                      CUBIC FEET

GALLONS                                                  3785                                        CUBIC CENTIMETERS

GALLONS OF WATER                           8.3453                                      LBS OF WATER

INCHES OF MERCURY                           1.133                                       FEET OF WATER

INCHES OF MERCURY                          0.4912                                      LBS/SQ IN

INCHES OF WATER                              0.03613                                     LBS/SQ IN

INCHES OF WATER                              0.07355                                     INCHES OF MERCURY

KILOWATT HOURS                                  3415                                        BTU/HR

LITERS                                                    0.2642                                      GALLONS

METERS                                                   39.37                                       INCHES

MILLIMETER                                           0.03937                                     INCHES

OUNCES/SQ IN                                       0.0625                                      LBS/SQ IN

POUNDS/SQ FT                                    0.01602                                     FEET OF WATER

POUNDS/SQ IN                                        2.307                                       FEET OF WATER

POUNDS/SQ IN                                        2.036                                       INCHES OF MERCURY

TEMP °C + 17.78                                        1.8                                         TEMP °F

TEMP °F – 32                                            .555                                        TEMP °C

WATTS                                                   0.05692                                     BTU/MIN

WATTS                                                      1000                                        KILOWATTS

WATTS                                                     3.413                                       BTU/HR

FORMULAS

  STEAM TO WATER HEAT EXCHANGER:

  

   

            (DT °F IS:  TEMPERATURE OF THE LEAVING WATER MINUS TEMPERATURE

             OF THE ENTERING WATER)

  STEAM COIL HEATING AIR:

            (DT °F IS:  TEMPERATURE OF THE LEAVING AIR MINUS TEMPERATURE

             OF THE ENTERING AIR)

  HOT WATER COIL:

           

           

  ELECTRIC HEAT COIL:

           

           

  CHILLED WATER COIL: 

            BTU/HR = 8.3453 x 60 x DT °F OF WATER

            1 GPM = 5000 BTU/HR AT A WATER DT OF 10°F

  LIQUID FLOW IN PIPES:

  AREA OF A CIRCLE:

            AREA = 3.1416 X RADIUS SQUARED

            OR  = DIAMETER SQUARED X .7854

  CIRCUMFRENCE OF A CIRCLE: 

            CIRCUMFERENCE = RADIUS X 6.2832

            OR = DIAMETER X 3.1416

  CAPACITY OF A TANK IN GALLONS:

   (ALL MEASUREMENTS MUST BE IN INCHES)

            -CYLINDRICAL TANKS:

                        GALLONS = LENGTH X DIAMETER SQUARED X .0034

            -RECTANGULAR TANKS:

                       

  LINE CURRENTS, ELECTRIC HEATERS:

            - SINGLE PHASE -

                       

            - THREE PHASE -

                       

PH

While not a conversion or formula, the PH table is included because all hydronic heating and cooling systems should be tested for the PH level of the circulated fluid.  High acidity causes corrosion whereas high alkalinity causes scale deposits.  Hydronic system fluid should have a PH level between 7.5 and 8.5.

Some industrial specifications may include the PH of a fluid being measured, so the proper materials that come in contact with the fluid can be selected.

A PH of 7 is “neutral.”  A PH number lower than 7 is acidic.  A PH number higher than 7 is alkaline.  Note that as you go up or down the PH scale from 7, each successive number is 10 times a stronger value!

Table 1.

      PH Value

Relative Strength

Representative Product

1

1,000,000

Hydrochloric Acid

2

100,000

Gastric Juices

3

10,000

Vinegar

4

1,000

Orange Juice

5

100

Molasses

6

10

Milk

7 (Neutral)

1

Pure Water

8

10

Sea Water

9

100

Borax Solution

10

1,000

Soap

11

10,000

Tri-Sodium Phosphate (TSP)

12

100,000

Household Ammonia

13

1,000,000

Lye

Feature this resource?: 
No


Main menu 2

about seo