Industrial filtration for petrochemicals

What is filtered, and why

Process liquids carry most of what is at stake. They are filtered for catalyst fines, degradation products, corrosion particles torn from circuits, and anything that could foul an exchanger or damage a pump seal. Fineness is chosen from what is being protected downstream, never on principle.

Cooling water and utilities next, where filtration protects whole circuits from fouling and biological deposit. These are large flows and medium ratings: the filter area installed matters more there than fineness.

Process gases and vents, where separation and filtration combine: entrained droplets are handled by coalescence, particles by filtration, and the two functions call for different objects.

And finally air: ventilation of control rooms and electrical buildings, instrument air, and air handling in technical buildings. Activated carbon has its place when it is gaseous species, not particles, that must be retained.

The constraints of the environment

The chemistry of the fluid decides almost everything, and it cannot be read from a generic table. The same material withstands a dilute acid when cold and degrades in a concentrated one when hot: compatibility depends on concentration, temperature and exposure time together. That is why we start from the product safety documentation and from the medium manufacturer’s compatibility table, and not from a ready-made correspondence.

Temperature adds to chemistry rather than replacing it: it lowers the strength of a medium at the same time as it accelerates chemical attack. And it is not the medium alone that sets the limit — the frame, the adhesives and the gaskets each have their own, and the lowest one governs.

Continuity is a technical constraint. On an installation running without interruption, replacement is planned by campaign; an element that is unavailable does not delay a purchase, it delays a shutdown.

And finally the regulatory frame, denser than in most industries: establishments falling under the classified installations regime, provisions on major accidents, the framing of industrial emissions, and zoning as soon as an explosive atmosphere is possible. On such a site, knowing exactly what has been fitted is not a formality: it is a piece of keeping control of the installation.

What outsourcing the purchasing function changes here

Requirements cross several departments — process, utilities, maintenance, new works — and several product families that share neither suppliers nor lead times. Consolidating that is a full-time job that few sites can afford in house.

We identify the right element, approach several manufacturers for the same requirement, and keep the history of what has been fitted, vessel by vessel. When no market reference fits, the element is made to dimension or to an imposed medium.

What to tell us

The nature of the fluid and its safety documentation; the service temperature and pressure; the flow; the dimensions of the element in place and its marking; the type of housing; and the replacement cycle. If the location is classified into a zone, say so in your first message.