Bioreactor and Extraction Heat Exchangers

At the vessel wall. Anything that can touch media, harvest, buffer or product is specified to the pharmaceutical standard; the TCU heater and cooler behind the jacket are utility equipment and are bought that way. The practical form of that line is two line items on the user requirement specification: a jacket loop pair in 304 or 316 with material reports and a hydrotest certificate, and the sterilizer, regenerator and chillers with the full turnover package.

Proof that the fastest-moving element of media saw 121 C for the validated time. The hold tube is sized on the fastest particle, not the mean velocity: in laminar flow the centerline moves twice as fast as the average, so a hold tube that gives 15 minutes on paper gives 7.5 at the center. The qualification run uses the maximum pump output, an RTD at the hold tube outlet driving a divert valve, and a hold tube sloped upward with no pockets. The heater earns its place by carrying enough area that the outlet still reaches 121 C at the end of a fouled campaign, not only on day one.

It is unless the sterile side is kept at the higher pressure. Raw and sterile media share one tube wall in the regenerator, and a pinhole leaks toward the lower pressure. The sterile side already carries back pressure above the 15 psig at which 121 C media would flash, so the raw side is throttled to stay below it and a differential pressure alarm proves it. The saving is real: 10 gpm of media heated from 20 to 121 C is about 900,000 Btu/h, and a regenerator recovering 70 percent cuts the steam heater to roughly 270,000 Btu/h. Both the regenerator and the pressure arrangement go on the P&ID together; a double tubesheet alone does not protect against a tube that leaks inward.

To food or dietary supplement GMP, which asks for materials and pressure records rather than finish readings. A hemp or botanical extractor typically works under 21 CFR 111 or 117, so the package is material reports for the 316L product side, a food-contact statement for every gasket, the hydrotest record and the ASME data report where the shell is stamped. The reviewers who do read the drawings are the fire authority and the insurer, and they want the design pressure of anything holding cold solvent and the area classification of the skid.

Yes, but not one that touches the culture. The bag sits in a jacketed holder, and the holder is served by the same small water loop heater and cooler that a stainless vessel uses; at 2,000 liters of mammalian culture that is a few kilowatts, about 10,000 Btu/h for 3 kW. Upstream the media is still made on WFI and chilled or sterilized through stainless, and downstream the harvest still goes through a chiller to 2 to 8 C before capture. A single-use suite ends up with fewer validated exchangers than a stainless one, not none, and the ones it keeps are product contact.