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Specification

Specifications

The composition and sulfur content ratio of LP gas supplied within Japan adheres to criteria specified in JIS and "The Law Concerning the Securing of Safety and the Optimization of Transaction of Liquefied Petroleum Gas".In addition, Japan LP Gas Association also has its own set of criteria which endeavors to set guidelines to guarantee the preservation of reasonable quality standards by enforcing the addition of methyl alcohol (during winter) to prevent residential-use regulating apparatus from freezing up, controlling 1.3-butadiene content (less than 0.1wt%), and controlling mercury content (propane: 0.009mg/Nm3 or less, butane: 0.080mg/Nm3).

Japan Industrial Standards
Type Item Composition
(mol%)
sulphur content
(molarity%)
steam
pressure
(40℃)
(Mpa)
density
(15℃)
(g/cm3)
copper sheet
corrosion
(40℃, 1h)
main uses
ethane
+ethylene
propane
+propylene
butane
+butylene
butadiene
Class 1 No.1 5 or
less
80 or
more
20 or
less
0.5 or
less
0.0050
or less
1.53
or less
0.500

0.620
1 or
less
fuel for
residential use
fuel for
commercial use
No.2 60 or more
less than 80
40 or
less
No.3 less
than 60
30 or
more
Class 2 No.1 90 or
more
10 or
less
―(NB) 1.55
or less
fuel for
industrial use
raw materials for
industrial use
fuel for
automobile use
No.2 50 or more
less than 90
50 or
less
No.3 less
than 50
50 or more
less than 90
1.25
or less
No.4 10 or
less
90 or
more
0.52
or less

(NB)In the case of automobile use, industrial use (fuel and raw materials), and all other uses, butadiene content must not be an impediment to the intended purpose of use.


Environmental factor

The carbon dioxide emission factor conversion index from the combustion of LP gas is 0.86 in terms of crude oil being 1, which is approximately 10% lower than gasoline, kerosene and other petroleum products, and thus puts it environmentally into the top class of fossil fuels including LNG.

CO2 emission factor resulting from combustion of various fuels
t-C/GJ t-CO2/GJ t-CO2/unit
amount
index calorific value (GJ)/
unit amount
coal
(ordinary
charcoal)
0.0247 0.0906 2.33 (t) 1.32 25.7 (t)
crude oil 0.0187 0.0686 2.62 (kl) 1.00 38.2 (kl)
gasoline 0.0183 0.0671 2.32 (kl) 0.98 34.6 (kl)
kerosene 0.0185 0.0678 2.49 (kl) 0.99 36.7 (kl)
Bunker A 0.0189 0.0693 2.71 (kl) 1.01 39.1 (kl)
LP gas 0.0161 0.0590 3.00 (t) 0.86 50.8 (t)
LNG 0.0135 0.0495 2.70 (t) 0.72 54.6 (t)
city gas 0.0136 0.0499 2.23 (1000Nm3) 0.73 44.8 (1000Nm3)

Source : Ministry of Environment "Ministerial Ordinance Concerning Calculation of Volume of Greenhouse Gas Emission through Pursuit of Special Emitter's Business Activities"

Breakdown of propane and butane CO2 emission output level
  per kilogram per cubic meter
propane 3.0kg 6.0kg
butane 3.0kg 8.5kg

Furthermore, when the volume of emissions occurring at the production and transport stages are included, with petroleum represented as 1, the index conversion rate is 0.90, which is roughly the same low emission volume level as city gas and LNG.

CO2 emission volume (LCI) including the production and transport stages
  emission factor [g-CO2/MJ] index
petroleum 73.98 1.00
coal 94.98 1.28
LNG 61.57 0.83
city gas 62.95 0.85
LP gas 65.71 0.89