Flexible connection for liquid ammonia tanks
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Article 6.2.25 of the Code for Fire Protection Design of Petrochemical Enterprises requires that the inlet and outlet pipes of storage tanks shall use flexible connections; meanwhile, Article 7.2.18 stipulates that liquid ammonia pipes shall not be connected using hoses. Then, what type of flexible connection should be used for the inlet and outlet pipelines of liquid ammonia storage tanks?
Special provisions take precedence over general provisions
Flexible connections and hose connections are not the same thing. Flexible connections include various methods such as π-bending; we have adopted the approach of adding spring supports, which has also been recognized by experts
With a metallic n-type structure, is it considered a flexible connection? Where are there any specific instructions regarding flexible connections?!
Is the question well-phrased, enough to warrant a selective interpretation?
It’s the π shape (some also call it the several-character shape); the most common one is the steam pipe； http://www.doc88.com/p-7982826074363.html
Both π-type and L-type are included. We were originally L-shaped, but in the end spring hangers were still added.
This type of connection is generally used to eliminate axial stress, while flexible connections are installed at the tank area connections primarily to prevent pipeline or valve failure caused by radial deformations such as ground settlement or earthquakes; it seems that this approach does not meet the requirements.