Issues related to surfacing of pressure vessels and use of composite plates
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This post was last edited by damen on 2015-12-10 16:03. What are the advantages and disadvantages of using nickel-based alloys for cladding on pressure vessels, as compared to using nickel-based alloy composite plates directly? Is it easy to shape structures such as expansion joints (with Q245R steel plates designed to be 30 mm thick) using nickel-based alloy composite plates? Is it better to use surfacing instead?
Please ask an expert for help @Shuguang Bellows
It must be difficult to perform surfacing welding on the expansion joint after it has been formed, but it should be surfaced and welded beforehand.
It’s quite rare to see expansion joints made of composite plates or welded layers
I’m not an expert in welding; let’s learn together. Regarding the welding structure of expansion joints, I don’t think the surfacing process is used for them – please give me some advice, experts!
Can a 30mm thick steel plate be used to make a pipe expansion joint? If possible, what equipment is used to create nodes?
It is also a hydraulic forming machine – a press with a capacity of over 20,000 tons. There is a company in Shandong that can carry out such forming; it is said that the thickness achieved can be up to 50 millimeters. These components are used for cooling reactors in acrylonitrile production facilities.
Thank you. We have a wastewater treatment system for ammonium chloride wastewater; the temperature is 100°C, and the containers are made of titanium-steel composite material； May I ask whether the corresponding pipe expansion joints (sizes DN350, DN400, DN500) should be made of PTFE-lined material or titanium-steel composite pipes? I don’t know if there are titanium-steel composite pipes.
:Lol: Lol, I’d recommend contacting the 725 Institute in Luoyang. Our factory uses their expansion joints – they’re probably the best manufacturer of compensators in China. The type you mentioned shouldn’t be difficult to produce. No need to thank me; I’m just Lei Feng
For treating ammonium chloride wastewater like this, a composite plate of PTFE and steel is sufficient; PTFE can handle temperatures of 100 degrees perfectly, while titanium plates are too expensive!
Thank you! Since it is vacuum evaporation at a vacuum level of 50 KPa, I am concerned that the PTFE lining might separate from the substrate. Can PTFE + steel be used in a vacuum environment?