Why are there no flexible pipe hangers using ropes as connectors in the chemical industry standard pipe rack drawings?

Chemical industry standard pipe rack drawings generally do not use flexible supports in the form of ropes (such as steel wires or slings) as standard components, for the following main reasons: 1. **Stability and safety considerations**: Flexible connection elements like steel wires have a high degree of flexibility; under stress they tend to sway, and may experience significant uncontrolled vibrations due to dynamic conditions such as wind loads, earthquakes, operational vibrations, or fluid pulsations. Over time, this can even lead to pipe fatigue and damage, affecting operational safety. 2. **Durability and reliability issues**: Ropes are prone to wear, fatigue, and corrosion after being under load for extended periods, resulting in a relatively short service life. They require frequent inspection, replacement, and maintenance, which increases maintenance costs and associated risks. 3. **Inability to effectively control the position and direction of pipe displacement**: Although chemical pipelines can tolerate a certain degree of displacement, this displacement usually needs to be confined to a specific plane, specific direction, or within certain limits. Flexible hangers make it difficult to precisely restrict the pipe’s displacement within fixed directions, and this may lead to unwanted movement in lateral or rotational directions. 4. **Principles of industry standardization and standardization**: The HG/T chemical industry standards aim to promote typical, safe, and proven solutions; the component structure based on rigid suspension rods has been shown to be safe and reliable through extensive practical use. The absence of wire rope hangers is the result of accumulated and summarized experience from long-term engineering practice. This approach has been standardized and verified through extensive research and practical testing, making it more reliable. Although the flexible hanger structure is relatively simple, considering factors such as safety, stability, reliability in actual operation, and long-term maintenance costs, the HG/T standards specify rigid hangers, which are more suitable for the long-term use in chemical plants, as the standard components; rope-based flexible hangers, which are difficult to control and require complex maintenance, are generally not recommended. .