Recent content by tmengineer

Hello, I've got a job coming up where I'm performing an inspection of a thermal oil heater as part of routine maintenance checking The heater is horizontal 1500kW gas fed, 2.5 years old, with thermal fluid being pumped around the internal pipe coil The gas line to the burner will be...

Hello, Thanks for your replies! Stonecold, we do make (dimple) jackets for some process vessels but unfortunately the still body has already been made so I'd much prefer to find a solution without putting a jacket on the side. Closed loop heater systems with a re-circulation line and heat...

Hello, I'm designing a steam coil to be used in a batch process still - we are manufacturing the still and the steam coil and the P&ID is being done by others. The steam inlet line is DN65 and in order to get a sufficient heating area* inside the still a double layered coil is going to be...

Georgevergese, The internal diameter of the tubes is 17mm. C106 copper is basically pure (99.85%) and the tubesheet will be made of brass (Cu + Zn) alloy. The use of copper is due to a process constraint; the condenser + subcooler is being used in a whisky distillery where the contact between...

Hi EdStainless, The cooling tubes are made out of copper (C106 half hard 10 gauge). The water quality for the region is defined as "soft" on the UK water agency website and has Calcium mgCa/l = 2.90, Calcium mgMg/l = 1.1, hardness as mg/l CaCO3 = 11.76, Clark degrees 0.82, French degrees...

Hello, I'm just about finished the thermal design of a multipass condenser and subcooler system and would like to know if anyone has some real world experience with these units to compare with the theory I've been using: I'm proposing to use a vertical shell and tube condenser then vertical...

Duwe6, At 80 degrees C and 1 atm the saturated vapour pressure of water is 481 mbar (calculated with the Buck equation - similar to Antoine but simpler), and the water vapour pressure is 478 mbar. The temperature which the saturated vapour pressure is 478 mbar is 79.82 degrees C (again...

Hello! Sorry for the late reply - I haven't forgotten about this I've just been busy doing some other work for the last few days. I'll get back to you properly next week once I've had a chance to look at this again. Thank you so much for your contributions so far!

bimr, Yes when using the ideal gas law for a constant volume (closed system) and dT from 20 degrees C to 80 degrees C the overpressure is 207.4 mbar (155.6 mm Hg). And also, when modelling the tank as a closed system with a pure water at 80 degrees C pool at the bottom the vapour pressure is...

Will the incoming hot water not heat up the air inside the tank causing it to expand and cause an overpressure?

I'm sorry to change tack but the production manager told me that the tank failed due to the overpressure caused by the hot rinsing rather a vacuum from draining. The vent was probably still blocked as discussed above but now I'm looking at it from a different approach. I want to know what the...

Zdas, Sorry I didn't see your second comment until I was re-reading the thread this morning. That's good - if the pipe calculations suggest that an unrestricted pipe would provide an adequate flow rate then that's a useful result. I'll focus on the possibility of an obstruction in the pipe...

It's pumped away. Why do you ask?

Compositepro, I think I mislead you slightly - the tank cools naturally without cold water addition, it is in a similar tank that cold water is added, and yes this causes a greater pressure drop than the outflow of 900 l/min. I have made a spreadsheet for the rapid cooling scenario which I...

Hi 1gibson, I'm pretty sure that the vent is the problem. There is 8 fermenters, 4 with 4" -> 5" vents, and 4 with 6" vents (they were installed in 2 phases) and the 4 with 6" vents do not show as much sign of damage as the 4" -> 5" lines do. The fermenters have "switchers" in the gas space...