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Gammon: Api Gravity and Density Calculators

Gammon Technical Products manufactures API gravity and density calculators. The GTP-3012-1A calculator corrects API hydrometer and relative density readings taken at any temperature to readings at 60°F. It can also convert between API gravity, relative density, and metric density. The GTP-2727EF calculator corrects density readings from hydrometers to 15°C for different types of fuels. Both calculators feature circular scales and are more accurate than printed tables due to avoiding errors in transition zones between densities and gravities.

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71 views2 pages

Gammon: Api Gravity and Density Calculators

Gammon Technical Products manufactures API gravity and density calculators. The GTP-3012-1A calculator corrects API hydrometer and relative density readings taken at any temperature to readings at 60°F. It can also convert between API gravity, relative density, and metric density. The GTP-2727EF calculator corrects density readings from hydrometers to 15°C for different types of fuels. Both calculators feature circular scales and are more accurate than printed tables due to avoiding errors in transition zones between densities and gravities.

Uploaded by

for unknown
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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GAMMON TECHNICAL PRODUCTS, INC.

P.O.BOX 400 - 2300 HWY 34


MANASQUAN, N.J. 08736 API GRAVITY

GAMMON
& DENSITY
PHONE 732-223-4600 CALCULATORS
FAX 732-223-5778
WEBSITE www.gammontech.com BULLETIN 100
STORE www.gammontechstore.com (03-04)

API GRAVITY AND DENSITY CALCULATORS

API GRAVITY CALCULATOR


GTP-3012-1A
Corrects API hydrometer readings at any
temperature (°F) to API degrees at 60°F.

Corrects relative density hydrometer readings at


any temperature (°F) to relative density at 60°F

Converts API gravity to relative density*

Converts API gravity to metric density (kg/m³)

Converts API gravity to weight (lbs/gal)

DENSITY CALCULATOR
GTP-2727EF
Converts density readings taken with a hydrometer
to corrected density at 15°C

Separate scales for 3 different types of fuel:

• Kerosene (Jet A, Jet A-1, JP 5, JP 8)

• Wide Cut (JP 4, Jet B)

• Avgas

Scales read in kg/m³

* “Relative density” is now the accepted term for “specific gravity.”


INSTRUCTIONS FOR API CALCULATOR GTP-3012-1A
1. Rotate the disk until the observed hydrometer reading (°API) is aligned
with observed temperature (°F).
2. Read the corrected °API at the 60°F arrow.
NOTE: If a relative density or specific gravity hydrometer is used, set the
hydrometer reading opposite the observed temperature. Then read the
corrected relative density at the 60°F arrow.

INSTRUCTIONS FOR DENSITY CALCULATOR GTP-2727EF


1. Rotate the disk until the observed hydrometer reading is aligned with
observed temperature.
2. Read the corrected density at the 15°C arrow.

Th t ors.
is c la
ircl calcu
e re
p re s r of both
ents the
actual diamete

NOTE ON GTP-3012-1A
Results obtained with this calculator in the API gravity range from 48 to 51 (or a correction that goes through this range)
cannot be compared to the printed tables because we have avoided error created by this transition zone (see Volume X of
Petroleum Measurement Tables (D1250-80/IP200), pages X-73 to X-79). For jet fuels, we extended the curve upward using
the original equation without entering the transition zone. For avgas, we extended the gasoline curve downward in the same
manner. From a technical standpoint, our scales will yield more accurate results than the printed tables.

NOTE ON GTP-2727EF
Results obtained with this calculator in the density range from 770 to 784 kg/m³ (or a correction that goes through this range)
cannot be compared to the printed tables because we have avoided error created by this transition zone (see Volume X of
Petroleum Measurement Tables (D1250-80/IP200), pages X-73 to X-79). For jet fuels, we extended the curve upward using
the original equation without entering the transition zone. For avgas, we extended the gasoline curve downward in the same
manner. From a technical standpoint, our scales will yield more accurate results than the printed tables.

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