General vessel design tips

The process engineer gets involved in many mechanical aspects of vessel design such as thickness, corrosion allowance, and internals. Here are some pitfalls to watch for along the way  

Be sure to leave sufficient disengaging height above demisters, otherwise a healthy derate must be applied. 

For liquid/liquid separators, avoid severe piping geometry that can produce turbulence and homogenization. Provide an inlet diffuser cone and avoid shear-producing items, such as slots or holes. 

Avoid vapor entry close to a liquid level. Reboiler vapor should enter the bottom of a fractionator a distance of at least tray spacing above high liquid level. Tray damage can result if the liquid is disturbed. 

Avoid extended nozzles or internal piping that the operator cannot see, if at all possible. 

---