Chapter 3 Piping Connections
Enough room shall be reserved for both axial and radial expansion of the vessel in the
design of the manifolds and pipelines; otherwise the vessel and other components of the
system could be damaged. Careful reading of this chapter will facilitate safe and normal
working conditions of the vessel and pipelines.
3.1. Permeate Port Connections
3.1.1. Use flexible connections to reduce vibration impact.
3.1.2. A U swan-neck tubing with flexible connectors at both ends, or one piece of
flexible soft pipe should be used for permeate port connections.
3.1.3. Extra and independent support shall be provided for permeate port pipelines
rather than using permeate port as support.
3.2. Feed/Concentrate Port Connections
3.2.1. Use flexible grooved couplings (IPS).
3.2.2. Do not connect any manifolds rigidly to the vessel.
3.2.3. Manifolds must be supported independently.
3.2.4. Manifold span should be greater than vessel span to allow for vessel growth
under pressure.
3.2.5. To reduce the risk of stress concentration we recommend that “two IPS
standard flexible couplings and one piping section” are used to connect the
Feed/Concentrate ports and manifold ports; this method lowers
requirements for housing alignment and the position accuracy of the
manifold welds. However, this method will increase the initial cost as shown
in figure 1.1.
3.2.6. The use of only one IPS standard coupling to connect directly to the
manifolds is also acceptable. However, the welding of the manifolds and the
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