Quick answer: To draw a bioreactor P&ID, place the jacketed vessel in the centre, group gas lines on one side and liquid additions on the other, and add every instrument loop using ANSI/ISA-5.1 tags [1]. Then tick off all fourteen connections, check sterile filters, steam traps, pressure control and the rupture disc to catch tank, and write measurable performance requirements.
You have fourteen connections to place on one page, a vessel that has to look credible to a process engineer, and a second step asking for performance requirements that must not read like a list of adjectives. The task is not hard, but it is easy to lose marks on small things. This guide explains how to draw a bioreactor P&ID for VOMP3011, and what markers tend to look for.
The live brief is on our page for the VOMP3011 P&ID-1 bioreactor task. If you also want to see the module’s wider context, the VOMP 3011 From URS to PQ descriptor is worth a read.
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Where the marks are
The brief has two parts, and the weighting is the lecturer’s to confirm. What follows is what markers typically reward in tasks of this type, not an official mark scheme.
| Part | What earns marks | What loses them |
|---|---|---|
| Step 1-1: P&ID sketch | All fourteen connections, correct symbols, instruments and control loops, tidy layout, legend | Missing lines, unlabelled valves, no instruments, crossing lines |
| Step 1-2: performance requirements | Measurable requirements, short expansion of each, link to operation | Vague wording, a list with no explanation, requirements that cannot be tested |
| Overall presentation | Clear, readable, referenced where relevant | Illegible handwriting, no tags, no sources |
A P&ID is a piping and instrumentation diagram. It shows equipment, pipework, valves and the instruments that measure and control the process. It does not show dimensions or a physical layout. Instrument identification follows ANSI/ISA-5.1, which sets out the letter codes and symbols [1]. The current listed edition is 2024, so check which version your lecturer expects.
Learn five things and you can draw most of the page: a circle for a field instrument, a circle in a square for a control function in a system, a line type for process and another for signal, a valve symbol for each valve type, and a tag pattern. In the tag TIC-101, T is temperature, I is indicating and C is controller. Keep each loop’s number consistent, so TE-101, TT-101 and TIC-101 belong together.
How to draw a bioreactor P&ID, step by step
Draw the vessel first. Give it a jacket, an agitator with the motor on top, and a bottom outlet. Then add connections in groups so the page stays readable.
- Put gas on the left: aeration supply in, exhaust out.
- Put liquid additions on the right: inoculum, media, acid, base and antifoam.
- Put utilities at the top: clean steam, condensate return, CIP, process water.
- Put the bottom outlet, pump and harvest manifold at the bottom.
- Put the jacket loop and temperature control skid on the side that has space.
- Add instruments last, then a legend and a tag list.
Number your lines or use callouts matching the brief, so the marker can trace each one in seconds. For sanitary design points such as dead legs, drainability and materials, ASME BPE is the standard to know [2].
Checklist of the fourteen connections
Use this as a final check before you hand the sketch in. For each line, the second column is a typical detail a marker would expect, and every item here is illustrative.
| No. | Connection | What to show |
|---|---|---|
| 1 | Aeration supply | Flow control, sterile filter, check valve, sparger |
| 2 | Aeration vent/exhaust | Exhaust filter, pressure transmitter, pressure control valve |
| 3 | CIP manifold supply | Spray device, isolation from process lines |
| 4 | Inoculum supply | Sterile connection, block valve |
| 5 | Media supply | Sterilising filter or sterilised transfer, block valve |
| 6 | Clean steam supply | Isolation valve, steam to vessel and filters |
| 7 | Contaminated condensate return | Steam trap, drain, temperature indication |
| 8 | Process water supply and return | Isolation valves, check valve |
| 9 | Over-pressure vent | Rupture disc, catch tank |
| 10 | Antifoam addition | Dosing pump or valve, level/foam probe |
| 11 | Acid addition | Pump, check valve, pH loop |
| 12 | Base addition | Pump, check valve, same pH loop |
| 13 | Bottom outlet to harvest | Bottom valve, pump, steam or double block and bleed at manifold |
| 14 | Thermal fluid supply/return | Jacket connections, temperature loop to the skid |
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Our VOMP3011 bioreactor P&ID sample lays this out as an equipment list and a full line schedule. It is for reference only, and your own drawing should show your own decisions.
Common mistakes
Most students miss the same few things, and they are easy to fix. The first is forgetting sterile filters. Air in and air out both need them, and a vent with no filter is an open door for contamination. The second is leaving out a steam trap. If condensate cannot leave the SIP route, cold spots appear and sterilisation is not assured.
The third is drawing an exhaust line with no pressure control. The vessel needs a controlled headspace, so show a pressure transmitter and control valve. The fourth is a rupture disc that vents to nowhere. Show a catch tank, because discharging process fluid to atmosphere is a safety and containment problem. The fifth is dead legs: long side branches where liquid can sit and breed contamination, which hygienic design guidance tries to eliminate [2].
Do not draw the sketch beautifully and then rush Step 1-2. Markers see plenty of tidy drawings with thin requirement lists. The explanation is where you stand out.
From performance requirements to URS and qualification
Step 1-2 is not a side task. In the module’s title, “From URS to PQ”, requirements are where the whole chain starts. Under EU GMP Annex 15, equipment is defined in a user requirements specification (URS), which then serves as the reference point through the validation lifecycle [3]. OQ tests operation across its anticipated ranges, and PQ confirms performance under normal conditions [3].
So write each requirement so someone could test it. “Good temperature control” can’t be tested. “Holds the culture at its setpoint within a stated tolerance across the operating range” can. The ISPE Baseline Guide on commissioning and qualification sets out a risk-based route to confirming such requirements [4].
| Requirement | Typical wording | Later test |
|---|---|---|
| Sterility | Maintains a sterile boundary during operation [5] | SIP study, filter integrity, media fill |
| Temperature | Controls to a stated range and tolerance | OQ temperature challenge |
| pH | Controls within a stated band by acid/base dosing | OQ dosing response |
| Oxygen transfer | Meets the peak oxygen demand of the process [6] | kLa determination |
| Cleanability | Drains and cleans to a defined standard [3] | Spray coverage, cleaning validation |
What students actually struggle with
The most common worry is drawing. Many students have never made a P&ID, and the blank page is the hardest part. Start with a pencil sketch of the vessel, then add lines. Your sketch is allowed to be hand-drawn, but it still has to be legible.
The second is knowing how much detail is enough. A “basic” P&ID does not need every manual drain, but it does need the valves and instruments that make the connections work. The third is Step 1-2 wording: expanding “temperature control” into two sentences without padding. Say what it controls, why it matters, and how you would know it works.
Frequently asked questions
Can I draw the P&ID by hand?
Yes, the brief allows a hand-drawn sketch or basic software. Whichever you choose, the lines must be clear, the tags readable and the legend present. A neat hand drawing with correct content scores better than a messy file made in software.
Do I need a legend?
Add one. A short legend with your valve symbols, instrument bubbles and line types helps the marker read your drawing without guessing. It also shows you understand ANSI/ISA-5.1 conventions [1].
How many instruments should I show?
Show the ones that make the fourteen connections control the process: temperature, pH, exhaust pressure, gas flow, and any level or foam sensor you use. Add dissolved oxygen if your design controls it. You do not need every gauge.
What is the difference between SIP and CIP on the drawing?
CIP uses cleaning solutions delivered through a spray device, while SIP uses clean steam to sterilise. They have separate supply lines on your drawing, and SIP also needs the condensate return and steam trap.
How long should the performance requirements be?
The brief asks for a sentence or two on each requirement. Aim for exactly that: what the requirement is, why it matters, and a measurable aspect. Eight to ten requirements usually cover the field.
Can you check my drawing for me?
We offer model answers and guidance, and the student remains responsible for what they submit under their institution’s rules. See our final year project help or Dublin assignment help pages for what is available. For a related technical write-up, see our ICH Q10 CAPA report sample.
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About the expert
Mary Jones holds a master’s degree in Chemical Engineering from the National University of Ireland, Galway. Her profile lists process design and reaction kinetics among her specialisms and more than ten years’ work as a chemical engineer, including on pharmaceutical plant projects.
References
- International Society of Automation (2024) ANSI/ISA-5.1-2024, Instrumentation and Control – Symbols and Identification. Available at: https://www.isa.org/products/ansi-isa-5-1-2024-instrumentation-and-control-symb
- American Society of Mechanical Engineers (2024) ASME BPE-2024, Bioprocessing Equipment. New York: ASME.
- European Commission (2015) EudraLex Volume 4, EU Guidelines for Good Manufacturing Practice, Annex 15: Qualification and Validation. Brussels, 30 March 2015.
- International Society for Pharmaceutical Engineering (2019) ISPE Baseline Guide: Commissioning and Qualification. 2nd edn. ISPE.
- European Commission (2022) EudraLex Volume 4, Annex 1: Manufacture of Sterile Medicinal Products. Brussels: European Commission.
- Doran, P.M. (2013) Bioprocess Engineering Principles. 2nd edn. Waltham, MA: Academic Press.
