ministry of land, infrastructure, transport and tourism (mlit), japan 3 jun 2014 definition for...
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Ministry of Land, Infrastructure, Transport and Tourism (MLIT), Japan
3 Jun 2014
• Definition for ‘non-exposed’ type of fuel storage tank
EPPR-07-20e
Japanese proposal on evapo –gtrJapanese proposal on evapo –gtr
B.1. TEXT OF THE REGULATION, GENERAL PART3.9. ‘non-exposed’ type of fuel storage tank and delivery system means that the fuel storage and fuel delivery system are not directly exposed to radiation of sunlight;
① Definition for ‘non-exposed’ type of fuel storage tank
ref: 1 ・ Chronological science tables 2 ： Japan machine handbook
Add the following sentence to the definition of ‘non exposed’ type fuel tank.‐3.9. ‘non exposed’ type of fuel storage tank and delivery system means that the fuel storage and fuel‐delivery system are not directly exposed to radiation of sunlight or if manufacturer can properly validateit to be treated as non exposed type.‐
JustificationThere are many models whose fuel tanks are covered by cowlings and only fuel tank caps areexposed and connected to the fuel tanks with rubber tubes. In such case, the fuel and vapor temperaturedoesn’t increase so much as specified by the exposed condition since the fuel cap is usually insulatedby low thermal conductivity material. Therefore, if a manufacturer can provide the evidencethat shows the equivalency to the non exposed type, it is appropriate to be treated as non exposed type.‐ ‐
Thermal conductivity(W/m/K)
Zinc 117Aluminum 236
Iron 83.5Nylon 0.27
Polyeopropylene 0.12
material
１
１
１
2
１
Example 1 where only the fuel cap is exposed
Example 2 where only the fuel cap is exposed
22.0
27.0
32.0
37.0
42.0
47.0
52.0
57.0
0 1000 2000 3000 4000
Temperature test result
cap
vapor
fuel
light
1
4
3
2
Time （ｓ）
Ｔem
pera
ture
℃
cover
12
3
4
test outline
vapor temperature.
5
5
tank
300w
MaterialCover ： epoxy resinCap: zinc alloysTank:steel pleteFuel:japan reguler E0
Test conditionTemperature ： 25℃Place: indoors
1
2
3
24.5
25
25.5
26
26.5
27
27.5
28
0 1000 2000 3000 4000
Temperature test result
Only the fuel tank cap is exposed and connected by non metallic (ex; rubber) ‐material to the fuel tank of non exposed type‐
Only the fuel tank cap is exposed and connected bynon metallic material to the fuel tank covered by cowling, non-exposed type.‐
In this case it can be treated as non exposed type, since the vapor‐and fuel temperature increases same as that of non exposed type.‐
light
Time (s)Va
por
tem
pera
ture
℃
All components of the fuel tank are non exposed ‐
1
2
1
2
vapor temperature.
vapor temperature.
MaterialCover ： epoxy resinCap: zinc alloysTank:steel plete
light
Reference
Temperature test result
light
Time (s)
1
Ｔem
pera
ture
℃
Time (s)
22
24
26
28
30
32
34
36
38
40
0 1000 2000 3000 4000
22
24
26
28
30
32
34
36
38
40
0 1000 2000 3000 4000
Ｔem
pera
ture
℃
cap
fuel
cover
2
3
4
5
tank
vapor
fuel
1
2
3
4
5
1
23
4
5
1
cap
cover
2
3
4
5
tank
vapor
fuel
MaterialCover ： epoxy resinCap: zinc alloysTank:steel plete
light
All components of the fuel tank are non exposed ‐
Only the fuel tank cap is exposed and connected by non metallic (ex; rubber) ‐material to the fuel tank of non exposed type‐
MaterialCover ： epoxy resinCap: zinc alloysTank:steel plete
22.0
24.0
26.0
28.0
30.0
32.0
34.0
36.0
38.0
40.0
0 1000 2000 3000 4000
Temperature measurement result
vapor
All components of the Fueltank are non exposed ‐
All components of the fueltank are exposed
Only the fuel tank cap is exposed andthe other parts are non exposed. ‐
light
In the case the resin fuel tank cap is exposed and the other parts are non-exposed, the vapor temperature increases same as that of non-exposed type. In this case it can be treated as non-exposed type.
1
2
3
Time (s)Va
por
tem
pera
ture
℃ 1
2
3
4
4
The fuel tank cap ismade from metal
The fuel tank cap iscovered with a resinboard
The fuel tank cap ismade from metal
The fuel tank cap ismade from metal
resin board
Example 3 where only the fuel cap is exposed
Example 4 where only the fuel cap is exposed
Example 6 where only the fuel cap is exposed
Example 5 where only the fuel cap is exposed