Oil/Water Separators

STERLING Separators

Design Simplicity. Proven Reliability.

Our separators are designed around a single key principle: simplicity works! No gravity pre-separation stage, no separate oil container to empty, no moving parts to fail or adjust.

Separation is handled entirely by Purotech's Progressive Filtration Media: progressive and carefully graded, it outperforms both crude polypropylene and carbon in every measurable way. It lasts longer, handles emulsified condensate better, is cleaner to handle and produces a superior outlet quality.

The result is a separator range that is genuinely easy to sell, easy to install, and, critically, easy to maintain.

350+

units regularly in stock in 40+ configurations

<4,000

hours between service intervals

<16,000

hours for PL550 & PL1100

The PURE Line

One Range, Every Compressor Size

The PURE Line covers compressed air systems from 15 kW to 1,100 kW, handling 90 to 7,600 cfm across eight models. Select by system power or air flow to find the right separator.

Model	System power	Capacity (cfm)	Capacity (m³/min)
PL15	15 kW	90	2.5
PL30	30 kW	200	5.7
PL75	75 kW	530	15.0
PL160	160 kW	1,150	32.6
PL320	320 kW	2,300	65.1
PL480	480 kW	3,450	97.0
PL550	550 kW	3,800	107.0
PL1100	1,100 kW	7,600	215.0

Every PURE Line separator shares the same design principle: no moving parts, cartridge or simple bag service process, and no separate oil container to empty. PL15 is our patented compact unit for the smallest systems; the largest models use standard commercially available IBCs to keep capital cost down on high-flow installations. An AF media upgrade is available across the range for emulsified or other complex condensates.

Ask Us to Size a Separator

Special Application

Emulsified Condensate? We Have a Solution.

Standard oil/water separators can struggle when condensate is emulsified, a situation that arises with certain compressor oils, additives or process conditions.

STERLING offers an AF (Active Filtration) upgrade for these situations: enhanced filter media within the same separator housing that delivers effective separation even with difficult emulsified condensate. No need for a different product range; just specify AF when ordering, or upgrade easily after installation.

Enquire About AF Upgrade

Standard condensate

Emulsified condensate

Separator cutaway diagram showing filter media

How It Works

Media-Based Separation — No Moving Parts

Condensate from the compressed air system enters the separator and passes through the filter media. The media captures oil droplets and allows clean water to pass through to the outlet: no gravity separation stage, no adjustable weir, no separate oil disposal can.

No moving parts

Nothing to adjust, wear out, or leak

Minimal footprint

Fits easily in any plant room

Rapid servicing

Quick, clean, safe to touch. Larger kits supplied in two parts for ease of handling

Superior media

Easily outperforms carbon. The Purotech media is from ISO 14001 accredited sources, and processed under ISO 9000