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43
TEMPERATURE COMPENSATION METHOD - DENSITY RATIOS FOR LIQUEFIED PETROLEUM
PRODUCTS
Table 5 - 12 Temperature/Density Pairs
1,2
Entry No. Temp (°C) Temp (°F)
Propane Density (Default)
(kg/m
3
)
Butane Density (Reference)
(kg/m
3
)
1 -26.1 -15 563.0 629.0
2 -20.6 -5 558.0 623.0
3 -15.0 5 551.0 617.0
4 -9.4 15 545.0 611.0
5 -3.9 25 537.0 606.0
6 1.7 35 529.0 599.0
7 7.2 45 522.0 594.0
8 15.0 59 510.0 585.0
9 23.9 75 496.0 574.0
10 29.4 85 487.0 568.0
11 35.0 95 478.0 562.0
12 40.6 105 469.0 555.0
1
For other liquefied gases modify the density defaults to their proper values in accordance with ASTM-IP Tables.
2
The EMR4 calculates temperature compensated volume using the 12 density pairs from Table 5 above in the following
formula:
V
o
= V
t
(
t
/
o
)
where: V
t
= uncompensated gross volume
V
o
= calculated temperature compensated volume
t
/
o
= ratio of density at measured temperature to density at base temperature
The ratio of density is calculated after inserting the appropriate P constants into the equation below:
t
/
o
= 1 + (-P
1
/
o
+ P
2
)(t - 15°C) + (-P
3
/
o
+ P
4
)(t - 15°C)
2
Notes:
The ratio of density is equation 4.21 from page 10 of the PTB-A 5 Measuring Systems for Liquids other than Water - June 1999 edi-
tion.
Setting factors (P
1
, P
2
, P
3
and P
4
) used to calculate
t
/
o
above are taken from Table 4.3 on page 11 of the PTB-A 5 Measuring Sys-
tems for Liquids other than Water - June 1999 edition.
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