Lined container pressure range.

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It is necessary to design a lined pressure vessel. 1 cubic unit, operating pressure of 0.6~0.8 Mpa, 50°C, 80% saline solution; it is necessary to regularly top up the water level and add pressurized saline externally. Saltwater is corrosive to steel and requires lining. For vertical head containers, the original design featured a closed access hatch; after reviewing various standards, it was modified to have the top head connected to the tank flanges, thereby eliminating the need for an access hatch or manhole. HG/T20678-2000 \"Technical Specifications for the Design of Lined Steel Vessels\" specifies that it is applicable to pressure vessels with a pressure of ≤0.6 MPa. GB26501-2011 \"General Technical Requirements for Pressure Vessels with Fluoroplastic Linings\" specifies a design pressure range of 0.1MPa ≤ p ≤ 2.5MPa, but the manufacturing and design acceptance standards are given in HG/T20678 \"Technical Specifications for the Design of Lined Steel Vessels\". The relevant standards for rubber linings also apply to ≤0.6MPa. The use of glass-lined level gauges is also limited to ≤0.6MPa. I’m very confused: the designed pressure for the container is greater than 0.6 MPa, and PTFE lining is desired; it’s the only option that meets GB26501 standards. However, since the manufacturing and design acceptance criteria are based on HG/T20678, the designed pressure of the container cannot be ≥0.6 MPa, and there isn’t even a suitable glass level gauge available. I’ve been struggling for days over how to design this.