PTFE expansion joint
PTFE expansion joint - industrial steel product
A flexible expansion joint, also known as a rubber expansion joint, is a component used in piping systems to accommodate movement, vibration, and thermal expansion.
Originally, steel expansion joints were used to absorb movement. With development of synthetic fibers, it was possible to make a flexible connector which permitted movement in all directions.
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Using rubber in expansion joints offers several advantages over other materials. Not only are they flexible and high strength, but they are durable and able to resist thermal expansion and contraction more than other materials.
Flexible expansion joints behave similarly to other expansion joints under pressure. Due to their design, expansion joints generate end thrust when subject to internal pressure, as seen in Figure 1.1. This end thrust must be accounted for in pipeline design. The end thrust generated is calculated by multiplying internal pressure (PSI) by the area listed in Table 1.1.
When used in a long and relatively straight pipeline, the pipe-to-soil friction is generally sufficient to balance the force. The use of thrust blocks or other means of anchoring is required when fittings are placed in close proximity to the expansion joint underground. This protects the pipeline from the tendency of the unit to expand when pressurized. In an above-ground installation such as a bridge application, some means must be provided to prevent the expansion of bridge application, some
| Size (inch) |
Arce (inch2) |
Thrust@150 PSI(lb) |
|---|---|---|
| 2 | 4.43 | 664.5 |
| 3 | 12.3 | 1845 |
| 4 | 18.1 | 2715 |
| 6 | 37.4 | 5610 |
| 8 | 64.3 | 9645 |
| 10 | 96.8 | 14520 |
| 12 | 136.9 | 20535 |
| 14 | 237.8 | 35670 |
| 16 | 237.8 | 35670 |
| 18 | 366.4 | 54960 |
| 20 | 366.4 | 54960 |
| 24 | 522.8 | 78420 |
| 30 | 804.3 | 120645 |
| 36 | 1152.1 | 175815 |
| 42 | 1555.3 | 233295 |
| 48 | 2027 | 304050 |
Table 1.1
The successful installation of expansion joints in a pipe system Requires the careful consideration of many variables. The most important issue is to establish the direction in which the movements are acting and in which way the movements should be absorbed. Once this information is known, the solution incorporating the most suitable expansion joint type(s) can be determined. The following pages give some ideas and suggestions for a pipe system design, and how to implement expansion joints in the system in the Best way.
GB/T 12465-2017 is the Chinese national standard titled "Piping Compensatory Couplings."
This standard specifies the classification, marking, requirements, testing methods, inspection rules, marking, packaging, transportation, and storage of piping compensatory couplings with flange connection sizes and sealing surfaces according to GB/T 9112-2010 (PN series). It is applicable to the design, manufacture, and acceptance of compensatory couplings for pipelines that transport seawater, freshwater, cold and hot water, drinking water, domestic sewage, crude oil, fuel oil, lubricating oil, finished oil, air, gas, steam at temperatures not exceeding 205°C, hot gases, and particulate matter. The standard is under the jurisdiction of the National Ship Machinery Standardization Technical Committee, with the State Standardization Administration as the administrative authority. Drafting units include Wuxi Golden Sheep Pipeline Accessories Co., Ltd. and China Shipbuilding Industry Comprehensive Technology and Economy Research Institute, among others.
These joints are designed to provide flexibility and compensate for changes in the system, reducing stress on the pipes and preventing damage or leaks.
A flexible joint is a coupling which can transmit torque between two shafts which are not aligned. A flexible joint between the shafts corrects any misalignment. A flexible joint allows some movement between the steering shaft and the steering box.
The installation of Flexible Expansion Joints is currently in progress as below:
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