Is stainless steel construction enough for GMP?

No. Material is necessary but not sufficient. A 316 stainless system can still be uncleanable if it drains poorly, contains dead legs, uses threaded fittings in the product path, or has unfinished welds. Cleanability is determined by geometry and finish at least as much as by material.

What is a dead leg, and why does it matter so much?

A dead leg is a section of the product path outside the main flow — an unused branch, an over-long tee, an isolated instrument connection. Cleaning solution flows past rather than through it, so residue persists where it is hardest to detect and hardest to sample. Dead legs frequently become the worst-case location that defines your entire validation outcome.

Can cleanability be improved after installation?

Partially, and rarely well. Some peripheral components can be replaced with better-designed equivalents, and hose routing can be corrected. But surface finish, weld quality, vessel drainage and the fundamental layout of the product path are set at manufacture. This is why cleanability belongs in the purchase specification.

Does sanitary design differ between hydrocarbon, ethanol and CO2 systems?

The principles are identical; the pressure points differ. Residue character, cleaning-agent compatibility and which components sit inside the GMP boundary all vary by method — most visibly in ethanol facilities, where solvent recovery equipment carries the same obligations as the extractor itself. Our [three-way method comparison](/blog/hydrocarbon-vs-ethanol-vs-co2-extraction-eu-gmp) sets out the wider differences in compliance burden.

Who is responsible for cleaning validation, the supplier or the operator?

The operator owns the validation. The supplier owns the design that makes it achievable, and should provide the material, finish and geometry documentation the validation depends on. A supplier who treats cleaning validation as entirely the buyer's problem is describing a boundary that does not exist.

Cleanability and Sanitary Design in GMP Equipment

Why cleanability decides GMP compliance in extraction equipment — surface finish, welds, drainability, dead legs, and what to specify before you order.