Where to input extra cladding thickness on tubesheets?
input 3.2 mm of cladding on shell and tubes side. But we want to increase cladding on tubesheet until 9.5 in shell side and 8 on tube side. How can I do this? Should I input those values in corrosion field? (if I do that hfl is bigger than hp on floating tubesheet).
The clad can be taken into account as a corrosion allowance, but this is just a workaround (there is an enhancement in the backlog: TFS#72825).
hfl is bigger than hp in the model because the corrosion (tube side) is not applied on hfl (thickness of the flanged extension), see below the detail of the calculation:thickness of the flanged extension : hflthickness at the periphery : hpthickness of the tubesheet: hnew = 329 mmCorrosion Shell Side: CAss = 9.5 mmCorrosion Tube Side: CAts = 8 mmExtra thickness (machining extension): hg = 8 mmExtra thickness (recessed face): hf = 5 mmhfl = hnew - hg - hf - CAss = 329 -8-5-9.5 = 306.5 mmhp = hnew - hg - CAts - CAss = 329 -8-8-9.5 = 303.5 mm
Bentley LEARN Server