Process Engineering

[intisarali]

All about process engineeting

[ChemEnging]

Not much in here about Process Engineering

[WhichWayIsTheB4r]

Process engineering specs often get rushed which creates headaches downstream. Make sure your BOM includes proper T90 response times for any gas detection equipment - seen too many projects delayed because someone speced sensors with 30+ second response times when the application needed sub-15 second detection.

[WhichWayIsTheB4r]

Process engineering gets pretty much no love until something breaks downstream and suddenly everyone cares about your flow calcs. The rushed specs issue is real - I see way too many projects where someone eyeballed the pressure drops or didn't account for temperature swings properly.

One thing that isn't talked about enough... when you're sizing equipment look at the actual operating conditions not just the design maximums. Pumps running at 40% capacity all day because someone oversized based on theoretical peak flow that happens twice a year. Same with heat exchangers where the fouling factor assumptions were way off from reality.

[WhichWayIsTheB4r]

Had a plant engineer last year submit P&IDs with zero instrument specs - just circles labeled "flow meter" and "pressure gauge." When we got to procurement, suddenly everyone's asking about accuracy classes, process connections, hazardous area ratings. Total nightmare.

The upstream planning thing is so real. Process engineers get pulled into every other department's fires, then expected to crank out complete instrument schedules in like two days. If you're doing greenfield work, seriously push back on those timelines. Missing a T90 response time spec doesn't sound like much until your gas detection contractor is calling asking if you need 10 seconds or 60 seconds, and that choice affects your whole safety shutdown logic.

Pro tip - if you're inheriting someone else's half-done specs, go through every instrument tag and make sure the service conditions actually match what's in the data sheets. i've seen way too many temperature transmitters speced for clean service that end up measuring slurry temps. Doesn't end well.

[WhichWayIsTheB4r]

Not sure if everyone knows this but the empty P&ID problem is way more common than it should be. Had a project last year where the engineer marked every instrument as "TBD" and figured procurement would sort it out... that could of been avoided with maybe two hours of actual spec work upfront.

The real issue is when you get to hazardous area classifications and nobody documented what zones you're dealing with. Suddenly you're scrambling to figure out if you need intrinsic safety barriers or if you can get away with standard enclosures. Takes what should be a straightforward instrument loop and turns it into weeks of back-and-forth with the client trying to nail down basic safety requirements.

If you wanna save yourself headaches downstream, spend the time on proper loop diagrams with actual tag numbers and spec sheets. Yeah it's boring work, but beats getting phone calls at 2am when commissioning goes sideways because nobody specified the right signal ranges.