Technical data
Regarding specifications and management guidelines
Vibration isolator joints
Editorial supervision by Government Buildings Department, Minister’s Secretariat, Ministry of Land, Infrastructure, Transport and Tourism
“Public Construction Work Standards Specifications”, 2019 edition
- 2.2.8 Flexible joints
- 2.2.8.2 Synthetic rubber ｐ.47
These are to be synthetic rubber with reinforcing materials or 3 bellows type polytetrafluoroethylene resin, with a copper or cast-iron flange, with sufficient flexibility, heat resistance, pressure resistance (at least 1.5 times maximum working pressure), and vibration-isolating effect. In addition, ethylene‐propylene rubber must be used for brine.
〈Explanation of brine〉
Brine, in the context of heat-source equipment, is a heat-transfer medium for forming ice in ice storage systems.
Heat is exchanged between the brine piping of heat-source equipment and the piping of secondary air conditioning equipment.
(From: Public Construction Work Installation Management Guidelines, FY 2019 edition, 2.1.1, p.133 Piping materials.
Editorial supervision by the Ministry of Land, Infrastructure, Transport and Tourism)
The rubber materials in the flexible joints used in secondary air conditioning equipment are not limited to EPDM.
Additionally, EPDM (SL10) can be used for brine due to its freezing resistance performance.
Editorial supervision by Government Buildings Department, Minister’s Secretariat, Ministry of Land, Infrastructure, Transport and Tourism
“Machinery and Equipment Work Supervision Guidelines,” 2019 edition
2.2.8 Flexible joints p.165
From Figure 2.2.12 Flexible joints
Figure 2.2.12 Flexible joints
| Mark/Number | Name |
|---|---|
| （A） | Synthetic rubber flexible joints |
| （B） | 3 bellows resin type flexible joints |
| ① | Flange |
| ② | n-φG |
| ③ | Solid ring |
| ④ | Rubber outer layer |
| ⑤ | Reinforcing cord |
| ⑥ | Rubber inner layer |
| ⑦ | Flange |
| ⑧ | n-φG |
| ⑨ | Bead wires |
| ⑩ | Rubber outer layer |
| ⑪ | Rubber inner layer |
| ⑫ | Reinforcing cord |
| ⑬ | Reinforcing ring |
| ⑭ | Bellows （polytetrafluoroethylene resin） |
| ⑮ | Limit bolt |
| ⑯ | Flange |
●Fluoro carbon polymer material
There are no provisions for 1 bellows, 2 bellows etc. shape synthetic rubber flexible joints in the “Machinery and Equipment Work Shared Specifications.” There are however provisions for 3 bellows shape items among polytetrafluoroethylene resin flexible joints. * Polytetrafluoroethylene resin is a type of fluoro carbon polymer.
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