EIMCO process equipment explained for solid-liquid separation projects

What the EIMCO name usually means in process equipment

In specifications, spare-parts records, and plant surveys, EIMCO process equipment usually refers to a family of solid-liquid separation technologies, not one standard machine. The name appears in several related contexts: historic Eimco Process Equipment, Dorr-Oliver Eimco after a 2002 merger, FLS legacy equipment in mining and mineral processing, and The EIMCO-K.C.P. Ltd product line in India. For chemical and industrial plants, the key question is not only who owns or uses the name, but what duty the equipment must perform: thickening, clarification, filtration, classification, or wastewater solids handling. This guide explains how to read the EIMCO label, where these machines fit, and what to verify before specifying, buying, repairing, or replacing them. For more related coverage, visit our process equipment section. (govinfo.gov)

A short history of the EIMCO process-equipment lineage

The EIMCO name has passed through several corporate and product-line structures. As a result, old nameplates, tender documents, drawings, and spare-parts lists may not use the same wording. Public corporate-history material states that Eimco Process Equipment began as Eastern Iron and Metal Corporation in 1884 and shortened its name to EIMCO in the 1930s. A U.S. Federal Register notice later described Dorr-Oliver Eimco USA as formerly known as Eimco Process Equipment Company and linked it to a November 2002 merger between GL&V/Dorr-Oliver and Eimco Process Equipment Company. (d3pcsg2wjq9izr.cloudfront.net)

Main equipment categories linked to EIMCO

Available product literature places most EIMCO-related process equipment in liquid-solid separation. The main categories include sedimentation equipment such as thickeners and clarifiers, filtration equipment such as horizontal belt filters, rotary drum filters, disc filters, and filter presses, plus supporting equipment for water and wastewater treatment. The right configuration depends on slurry characteristics, solids loading, process chemistry, duty cycle, tank layout, and downstream handling requirements. (fls.com)

Thickeners and clarifiers

FLS product information lists EIMCO and Dorr-Oliver thickeners in bridge-supported and column-supported designs. The same source describes bridge-supported thickeners as suitable for units up to 50 m in diameter and column-supported designs as practical up to 135 m, depending on project conditions. It also lists EIMCO Deep Cone thickeners, Reactor-Clarifier solids-contact units, and Delta-Stak inclined-plate clarifiers. These examples show why the same brand family can appear in very different sedimentation duties. (fls.com)

Filters and dewatering systems

Filtration equipment linked to the broader FLS and EIMCO legacy includes horizontal belt filters, vacuum disc filters, vacuum drum filters, and automatic filter presses. FLS describes the vacuum drum filter cycle as cake formation, drying, filtrate discharge, and cake discharge during drum rotation. Its horizontal belt filters are positioned for fast-filtering materials and washing applications. Those descriptions help define the general duty, but they do not replace material testing for a specific chemical slurry. (fls.com)

Water, wastewater, and industrial process uses

EIMCO-K.C.P. describes its product line as serving mineral and metallurgical processing, chemical processing, food processing, refining, pulp and paper, power plants, flue-gas desulfurization systems, and municipal and industrial water and wastewater treatment. Its listed product groups include sedimentation, filtration, classification, water and waste treatment, and recausticizing systems. In a chemical plant, the EIMCO keyword may therefore appear in both main process separation and utility-area solids handling. (ekcp.com)

How to read EIMCO in equipment specifications

In an engineering specification, EIMCO may indicate the original maker, a legacy brand, a design style, a replacement-part requirement, or a current product family offered by a specific supplier. Treating those meanings as interchangeable can create procurement risk. A spare rake arm for an old thickener, for example, is a different requirement from a new high-rate clarifier for a greenfield plant. The first step is to identify the actual asset: nameplate text, serial number, general arrangement drawing, drive model, tank diameter, material of construction, and any recorded upgrades.

Once the asset is identified, check whether the document calls for an original OEM part, an equivalent replacement, a rebuilt assembly, or a defined performance outcome. If the specification only says EIMCO type and gives no dimensional or duty data, the duty should be clarified before quotation. Useful inputs normally include feed flow, suspended solids, particle size distribution, temperature, pH, corrosive species, target overflow quality, target underflow density, cake moisture limits, operating hours, and cleaning requirements. The brand name alone cannot define a reliable process solution.

Where EIMCO-type equipment fits in chemical and industrial plants

Solid-liquid separation often sits between reaction, washing, concentration, neutralization, crystallization, tailings, or wastewater steps. In chemical processing, a clarifier may protect downstream filtration or discharge treatment. A thickener may recover mother liquor or reduce sludge volume. A filter may produce a cake suitable for washing, drying, disposal, or reuse. For that reason, the same equipment family can affect yield, water consumption, waste volume, operator safety, and maintenance workload.

The main limitation is that separation performance is highly material-specific. Settling and filtration behavior can change with particle shape, temperature, dissolved salts, surfactants, polymer selection, shear history, and slurry aging. Equipment selection should therefore be based on test work or validated operating data, not brand familiarity alone. Supplier literature is useful for mapping available equipment types, but it cannot prove performance for an untested feed.

Selection checklist for an EIMCO-type separation unit

For a new project or replacement study, engineers should evaluate both process duty and mechanical life-cycle requirements. A practical checklist includes: See also: Storage Systems.

• Define whether the core requirement is clarification, thickening, washing, classification, or cake dewatering.
• Collect feed data over normal, peak, startup, shutdown, and upset conditions.
• Confirm whether flocculants, coagulants, filter aids, or pH adjustment are acceptable for the process.
• Specify measurable outcomes, such as overflow suspended solids, underflow density, filtrate clarity, cake moisture, or recovery of valuable liquid.
• Check corrosion, abrasion, temperature, and cleanability requirements before selecting materials of construction.
• Compare available plot area, tank depth, foundation limits, access platforms, lifting points, and maintenance clearances.
• Review automation needs, including torque monitoring, bed-level control, feed dilution, interlocks, and remote diagnostics.
• Plan for spare parts, wear components, cloth or media changes, drive service, and shutdown windows.

The checklist is intentionally equipment-neutral. It helps avoid selecting a familiar EIMCO-related name before confirming whether the duty calls for a thickener, a clarifier, a vacuum filter, or a pressure filter.

Legacy maintenance, retrofits, and risk management

Many EIMCO-related machines remain relevant because thickeners, clarifiers, and heavy filters often have long mechanical lives. FLS has stated that its thickener history through the Dorr-Oliver and EIMCO brands goes back more than a century, with some Australian mine installations dating to the 1960s and even earlier decades. FLS also states that it supplies parts for legacy brands such as Fuller, Dorr-Oliver, and Eimco, including support for machines that are decades old when they were supplied by FLS or a legacy brand. (fls.com)

For plant owners, legacy support still needs to be verified asset by asset. Before ordering parts or approving a rebuild, compare the original drawings with the installed machine because field modifications are common. Inspect the drive, rake lift, bridge, feedwell, dilution system, tank, overflow launders, fasteners, guards, and instrumentation. If an upgrade is being considered, separate mechanical restoration from process improvement. Replacing worn parts may restore reliability, while feedwell, control, or flocculation changes may be needed to improve separation performance. FLS upgrade literature gives examples of water and flocculant reductions after specific upgrades, but those results should be treated as case-specific rather than universal guarantees. (fls.com)

Frequently asked questions

Is EIMCO process equipment a single product?

No. In practical use, the term usually points to a group of liquid-solid separation equipment associated with the EIMCO name, including thickeners, clarifiers, filters, and related wastewater or classification equipment. The correct product depends on the separation duty and supplier lineage.

What is the difference between an EIMCO thickener and an EIMCO clarifier?

A thickener is selected mainly to concentrate solids and recover water, while a clarifier is selected mainly to produce a clear overflow. The machines may look similar, but their design targets, loading rates, underflow requirements, and control priorities are different. (fls.com)

Can old EIMCO equipment still be maintained?

Often yes, but it depends on the exact asset, documentation, and supplier history. FLS states that it supports legacy brands including Eimco with OEM-standard spare parts through its service network. Plant teams should still verify serial numbers, drawings, and prior modifications before ordering. (fls.com)

Should a chemical plant specify EIMCO by brand name only?

No. A brand reference can help identify a preferred technology family or replacement standard, but a complete specification should define process duty, feed variability, performance targets, materials of construction, controls, access, and maintainability. For difficult slurries, testing or validated operating references are more important than the name alone.