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Quotes - Engineering - SalesVaccine suite
Heating the CIP circuit for a vaccine suite
A vaccine suite is a collection of modest vessels rather than one big tank: bioreactors of a few hundred liters, media preparation tanks, buffer hold tanks, harvest vessels and the transfer piping between them. Each one is cleaned in place after a batch and then sterilized, and the cleaning has to be proven, not assumed. The soil is cell debris, spent media, serum protein and antifoam, none of it hard to lift, all of it required to be gone before the sterilization step that follows. The CIP circuit that does the work is a caustic wash at about 1% sodium hydroxide and 160°F, an optional phosphoric acid step at 130°F, and a final rinse in purified water held at 180°F or better at the return.
Our part of that circuit is the heater. It takes the recirculated caustic or the rinse water from the CIP supply tank, brings it to the set point the validation protocol names, and holds it there for the whole step while a spray device moves 25–50 gpm through a vessel. Because the vessels are small, the circuit is small, and the heater is sized for a steady 30–70 gpm rather than a silo-scale flow. What the validation group cares about is that the temperature at the heater outlet reads the same on the 300th cycle as it did on the first, which comes down to surface area, steam control and a construction that does not foul.
A small circuit still needs a heater sized for the record
A 30–70 gpm vaccine suite circuit lifted from 70 to 160°F needs 1.35–3.15 MBtu/h. Give it a U-tube steam heater with surface to spare and the outlet temperature stays on set point through every step the protocol records.
What the suite circuit runs at
Caustic at 1% is the usual choice because the soil is soft and the vessels are often glass-lined or polished 316L that nobody wants etched. Temperature sits at 160°F, high enough to denature and lift serum protein in 20–30 minutes, low enough that the elastomers in the plant's own valves and the bioreactor probe ports are not stressed. Where phosphate buffers leave a mineral haze, a 0.5–1% phosphoric acid rinse at 130°F follows a few times a week.
The final rinse is purified water, and in a vaccine suite it is normally hot: 180°F at the return for at least 5 minutes so the rinse itself counts as a sanitizing hold. Spray devices on these vessels pass 25–50 gpm each, so a circuit cleaning one bioreactor and its transfer line runs 30–70 gpm in a 2-inch or 3-inch loop. The temperature rise from a 70°F makeup tank to 160°F caustic is 90°F; to a 180°F rinse it is 110°F.
The heater we put on it
A U-tube shell-and-tube with plant steam inside the tubes and the caustic or rinse water in a 316L shell is the construction that fits. At 70 gpm and a 90°F rise the duty is about 3.15 MBtu/h; at 30 gpm it is 1.35 MBtu/h. Even on 15 psig steam, condensing at 250°F, the approach above a 180°F rinse target is 70°F, which keeps the bundle short and the response quick when the step changes from caustic to rinse.
Because the loop is treated as sanitary, the shell side is built drainable, with tri-clamp connections through 4 inches and a 32 Ra interior finish. The bundle pulls for inspection, which the validation group will ask about at the first requalification. We add an RTD port at the outlet so the temperature that goes into the batch record is measured where the heater delivers it, not three fittings downstream.
What to send for a vaccine suite heater
A vaccine suite usually has a written CIP protocol already, and most of what we need is in it. Pull these items out and send them with the request.
- The vessels on the circuit and their spray device gpm
- Caustic concentration and the protocol set point
- Whether an acid step runs, and how often
- Final rinse temperature at the return and hold time
- Steam pressure at the heater location
- Finish, drainability and connection requirements
- Whether an RTD port and documentation package are required
Call and talk it through with an engineer: 1-805-484-2992
Vaccine suite questions
No. The heater is on the CIP circuit, which carries caustic, acid and hot purified water. Sterilization is a seperate step that follows CIP and runs on its own utility. We rate the solution side at 150 psig and 250°F as standard, which covers a 180–190°F rinse hold with margin, and we build it drainable so nothing pools between steps.
A 1.35 MBtu/h duty fits in a short bundle, but steam at 250°F or hotter still goes through heating and cooling every cycle, and a U-bundle takes that expansion without a fixed joint to leak. It also comes out for inspection, which a validated suite asks for. A plate pack on steam would be smaller but its gaskets would not like the thermal cycling.
Yes, and most suites do it that way: the CIP supply tank switches from caustic to rinse water and the same heater lifts whichever is flowing. The design point is the rinse, because 180°F is the higher target. The 316L shell, EPDM head gasket and drainable layout suit both fluids, and the steam valve turns down for the lower caustic set point.
Where the suite treats the CIP loop as part of the sanitary boundary, we supply a 32 Ra interior on the shell and solution-side heads with tri-clamp ends. If the loop is a utility that only feeds the spray devices and is itself flushed with hot purified water, a mill finish with sanitary ends is often accepted. Ask your quality group which boundary the CIP loop sits inside before you specify.
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