Bridge Work, Japan, Joint, Meiko Engineering, Rubber
Meiko Engineering RD Expansion Joint
Manufacturer: MEIKO ENGINEERING
Model: RD
The RD coupling is a rubber attachment that connects the large and small reservoir with a piping system.
Function
Low drainage and piping system to avoid leakage and flooding
RD couplings are fitted into the gap between the tank and the pipe.
Durability of RD couplings
Although the RD couplings are made entirely of natural rubber, the joints still have the following limitations:
Rubber degradation due to prolonged sun exposure
Oxidized by heat and steam from generators
Gases such as SOx, NOx, HCl, etc. also cause rubber to get corroded
Material Standard
| Rubber material specification (EPDM) | ||
| Normal state physicality | Item | Standard value |
| Kataca (HS) | 050±5 | |
| Tensile strength (MPa) | More than 10 | |
| Extension (%) | More than 400 | |
| Compression set test (100 ° C. × 70 H) (%) | Less than 50 | |
| Heat aging test (100 ° C. × 70 H) | Katasa change (HS) | +10 |
| Tensile strength change rate (%) | -20 | |
| Elongation change rate (%) | -30 | |
Ozone test
JIS K 6259 Test Method
Ozone Test Method The electrolyte constant method
Concentrations = 50 ± 5 pphm
Temperature = 40 ± 2 ° C
Elongation = 20% static
Time = 24 hours
Standard value No Criss
Design
Dimensional Table
| Size | D | D1 | A | B | d | d1 | d2 | d3 |
| 100 | 114 | 88 | 40 | 4 | 78 | 62.5 | — | — |
| 150 | 165 | 138 | 45 | 5 | 100 | 80 | — | — |
| 125 | — | 103 | — | |||||
| 200 | 216 | 172.5 | 50 | 5 | 125 ~ 130 | 90 | — | — |
| 139.5 ~ 140 | — | 113 | — | |||||
| 160 ~ 168 | — | — | 133 | |||||
| 250 | 267 | 225 | 50 | 6 | 168 | 137 | — | — |
| 216 | — | 180 | — | |||||
| 200 X0 180 | 216 | 188 | 50 | 5 | 188 | — | — | — |
Part Name and Material
No | Name of Part | Material | Remarks |
1 | RD Joint | E PDM | |
| 2 | Tightening Band | SUS304 |
