Q1: What does a "PN16 Pressure Rating" mean for this rubber expansion joint?
"PN16" indicates a nominal pressure rating of 16 bar (approximately 232 PSI or 1.6 MPa) at ambient temperature. This means the expansion joint is structurally tested and rated to operate continuously under working pressures up to 16 bar without experiencing structural fatigue, liner delamination, or outer shell rupture.
Q2: Why is a PTFE lining required inside a PN16 rubber joint for chemical pipelines?
Standard rubber compounds (like EPDM or NBR) can rapidly degrade, swell, or crack when exposed to strong industrial chemicals under high pressure. The PTFE lining serves as an impenetrable, non-reactive shield that prevents the chemical medium from touching the structural rubber body, allowing the joint to retain its pressure containment and flexible damping properties safely.
Q3: Do I need to install separate gaskets when mounting this PN16 joint?
No additional gaskets are necessary. The internal PTFE liner extends completely through the bore and flares outward across the entire raised face of the metal backing flanges. This turned-over PTFE collar functions as its own full-face chemical gasket, creating a leak-proof seal when torqued evenly against mating pipe flanges.
Q4: Can this PN16 joint be installed on the discharge side of high-pressure pumps?
Yes, absolutely. Pump discharge lines typically experience high working pressures and strong hydraulic vibrations. This PN16-rated joint is specifically built for such high-stress locations, acting as a flexible vibration isolator while easily handling the continuous 16-bar discharge pressure.
Q5: Is it necessary to use control units or tie rods with this PN16 expansion joint?
Yes, control units (limit rods) are strongly recommended for high-pressure applications like PN16 lines, especially if the piping system is unanchored. Control units prevent the bellows from over-extending beyond its maximum allowable limits during unexpected pressure surges or thermal shifts, protecting the pipeline anchors and the joint itself.
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