Your Trusted Source for the Finest Moisture Separators

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Who we are

The Didion Separator Company is a division of Didion’s Mechanical. We are a leading manufacturer of a full range of moisture separators that are capable of removing 99% of all entrainment that is 10 microns and larger from gas, steam, air, and vapor pipelines. If you require better efficiencies, we can customize our products to meet your requirement. Our separation is accomplished primarily by means of centrifugal force. Our internal elements are literally self-cleaning and therefore will not plug-up over time causing loss of efficiency and higher pressure drops unlike the commonly marketed vane elements. Also, they are noted for their rugged long term use without the internal element cracking and needing replaced, again, unlike the commonly marketed vane elements. We also have an excellent proven design for the fine scrubbing of geothermal steam. We are steered by a team of seasoned managers, a dedicated engineering and design department, certified welders and N.D.E. technicians trained to handle the most complex steam separators

Didion’s Mechanical, our parent organization, has registered a strong industry presence since 1977 by fabricating pressure vessels, piping, heat exchangers and other customized process equipment and machinery. Since its inception, Didion's Mechanical has manufactured over 3,100 A.S.M.E. stamped pressure vessels, boilers and heat exchangers registered with the National Board.

What we do

We know the detrimental impact that moisture or water droplets can have on your steam-powered and steam-heated processes, especially power turbines such as those used in geothermal power plants. At the Didion Separator Company, we stand committed to helping you minimize this impact by offering a feature-rich range of standard and custom moisture separators.

We have many inventoried steam separators for immediate shipment to your site or facility. Or, we can work with your team to design and manufacture custom separators to meet exacting efficiencies.

We contract with Hartford Steam Boiler (HSB Global Standards), as a third party Authorized Inspection agency and hold the following ASME and National Board stamps:
Steam Separators

U - For the manufacturing of Pressure Vessels to ASME Sect. VIII, Div. 1

U2 - For the manufacturing of Vessels to ASME Sect. VIII, Div 2(High pressure)

- For the manufacturing of Vessels to ASME Sect. VIII, Div 3 (Ultra high pressure)

- For the manufacturing of Power Boliers to ASME Sect. 1

PP - For the Manufacturing of Pressure Piping to ASME Sect. 1 & B31.1

- The National Board stamp for Repairs and Alterations to Code Stamped equipment

CE -  Used on pressure equipment certified in accordance with the European Pressure Equipment Directive (PED).

Product models and specifications

We offer as many as three standard moisture separator models. Didion Separator Company's Type DSL, Type DSU, and Type DST Separators are designed to eliminate 99% of all entrainment 10 microns and larger from gas, steam, air and vapor pipe lines. Our separators will not cause a significant pressure drop. Again, better efficiencies can be offered with custom designs to suit your requirements.

All standard 150# units are designed for 150 psig @ 500° F, and all standard 300# units are designed for 500 psig @ 650° F. Corrosion is always a concern, so all of our moisture separators have a built-in corrosion allowance for an extended service life. We use high-quality stainless steel for all internal elements to further enhance the performance of our units. All liquid separators are painted with high temperature safety blue paint.

All of our Steam Separators, Geothermal Scrubbers, Exhaust Heads, Flash Recovery Vessels, Blow Down Separators, Fabricated Strainers and Skid Packages can be custom designed in several other alloys, on request.

Let us help you

We can help you achieve better process efficiencies and make your steam-driven and steam-heated processes more profitable. To learn more, please speak with a Didion Separator Company representative at 419-483-2226 or email us at


liquid separators

The image above is a 108” I.D. Steam Separator with Inconel 625 centrifugal element; 750,000 lb/hr. @ 210 psig of steam;
Customer = CalEnergy, geothermal power plant.

Moisture Separators

    If you would like to provide your own pressure vessel,
     we will be happy to provide the internal separation
     element only,  in order to complete your moisture separators.


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