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Special hose for fuel dispenser
I. Hydraulic resistance
|
Performance Indicators |
Pressure MPa (bar) |
|
Maximum working pressure |
≥0.8 |
|
Test Pressure |
≥1.6 |
|
Minimum Burst Pressure |
≥3.2 |
II. Technical specifications
|
Nominal I.D. (mm) |
O.D. (mm) |
Max. Tolerance (mm) |
|
12.5 |
23 |
±0.75 |
|
16 |
27 |
|
|
19 |
30 |
|
|
22 |
33 |
|
|
25 |
37 |
±1.25 |
|
31.5 |
43.5 |
III. Testing Methods
1. Hose appearance is inspected as required by GB1189.
2. Hose dimensions are measured as required by GB9573.
3. Hose layer tensile strength, breaking strength, hot air aging performance, inter-layer adhesion and liquid resistant volume expansion are tested as required by GB5562.
4. Ozone resistance is tested as required by GB9571.
5. Hose pressure test and bursting test are done as required by GB5563.
6. Hose conductivity performance is tested as required by GB9572.
IV. When tested by the following methods, special hose for fuel dispenser should meet requirements given below:
|
No. |
Performance Indicator |
Required Values |
Test Piece |
||
|
Inner rubber layer |
Outer rubber layer |
||||
|
1 |
Tensile strength, MPa≥ |
7.0 |
7.0 |
Sampled from hose |
|
|
2 |
Breaking elongation %≥ |
250 |
250 |
||
|
3 |
Hot Air Aging (100°C×72h) |
Tensile strength change rate, %≥ |
20 |
20 |
|
|
Breaking elongation change rate, %≥ |
50 |
50 |
|||
|
4 |
Liquid resistant volume expansion rate, %≤ (Standard Room Temperature, 70.2h) |
Liquid C |
50 |
- |
|
|
Liquid B |
- |
100 |
|||
|
5 |
Adhesion strength, KN/m≥ |
Inner layer and reinforcement layer |
1.5 |
Sampled from hose |
|
|
Between reinforcement layers |
|||||
|
Reinforcement layer and outer layer |
|||||
|
6 |
Outer rubber layer ozone resistance |
No fracture is found. |
|||
|
7 |
Hydraulic test (Test pressure 0.8MPa) |
No leakage or other defect found. |
Whole piece or hose assembly |
||
|
8 |
Burst Pressure Test, MPa≥ |
1.6 |
Sampled from hose |
||
|
9 |
Volume expansion rate @ 0.4MPa, %≤ |
2 |
|||
|
10 |
Max. inter-connector resistance, (stretched, no liquid) , Ω.m≤ |
2×106 |
Whole piece or hose assembly |
||
|
11 |
Low-temperature yield (-10±3°C) |
No fracture or breakage is found. |
Sampled from hose |
||