r/ChemicalEngineering • u/Revolutionary_Tie551 • Mar 16 '25

Design Boiler P&ID advice

Im currently designing a fire tube boiler for a 3rd year project and am now onto drawing my P&ID. ive attached my current design but im unsure if ive missed anything or if i am actually doing it correctly. Any advice would be massively appreciated!

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u/Boiler2001 Mar 17 '25 edited Mar 17 '25

BMS system with low/high gas pressure switches, minimum air flow switch, some type of proof of purge position for lightoff, high steam pressure switch, and flame scanner

Also add in pilot gas portion of the fuel train

Fire tube boilers are generally small, and while they could include fuel/air metering, they are commonly single point positioning (SPP) with a jackshaft/linkage that mechanically connects the fuel valve and air damper to allow them to be adjusted with one fire rate controller

Should also have a pressure regulator on the fuel train.

Excellent start!

ETA: I forgot one of the most important ones, you need a local PI on the boiler drum

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u/Down2throw H2O2 Plant Operator / former Recovery Boiler Operator Mar 17 '25

Relevant username! Lots of good info here, I'd also recommend PI/PT of incoming fuel, before regulator and after with XV for ESD on the fuel.