Short, direct answers to questions that come up on real cGMP process equipment projects. Each entry answers one question and stops – the longer treatments live in our technical guides, and the working tools in our calculators.
These are written from field practice rather than brochure copy, which means several say plainly where a widely repeated rule is a convention rather than a requirement, and where a specification that looks complete is actually unenforceable.
Cleaning, passivation and surface
- Can stainless steel be passivated in place? – why coverage, not chemistry, is the limiting factor in an installed circuit.
Fabrication and documentation
- What documentation should a sanitary piping contractor hand over? – the ten records, and the two questions that separate a real package from paperwork.
Qualification and documentation
- Is the three-batch rule for PQ actually required? – no, and it appears nowhere in 21 CFR 211. Where the number should come from instead.
Facilities and cleanrooms
- Can a cleanroom be installed in an existing building? – the four constraints that decide it, and the two that stop projects.
Need an answer that is not here? Ask us directly – if a question comes up more than once, we add it.
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Frequently asked questions
What is in this knowledge base?
Direct answers to the specific questions that come up during cGMP process equipment projects, covering cleaning and passivation, fabrication and documentation, qualification, and facilities and cleanrooms. Each entry answers one question rather than surveying a topic.
How does the knowledge base differ from the guides?
The guides explain a subject end to end. The knowledge base answers a single question that has a real answer, usually one a project team is arguing about. Where a knowledge base answer needs more background, it points at the relevant guide.
Who writes these answers?
Paul Industries, drawing on cGMP process equipment and sanitary piping work across regulated manufacturing. Where an answer rests on a standard or regulation, the document is named so it can be checked directly.
Can I rely on these answers for a compliance decision?
They explain what a requirement is and where it comes from, which makes the decision better informed. The decision itself rests with the manufacturer quality organisation, against the standard or regulation as published.
What topics does the knowledge base cover?
Cleaning, passivation and surface condition; fabrication quality and turnover documentation; qualification and validation expectations; and facility questions such as cleanroom retrofits into existing buildings.
How do I find an answer to a question that is not here?
The guides cover the surrounding subject in more depth, and a specific project question is better answered in a conversation, because the answer usually depends on constraints that a general article cannot see.