Magnus Solvent Cleaning

Safe Agitated Immersion Cleaning with Solvents

Magnus Engineered Equipment has been making agitated immersion cleaning equipment since the 1950’s.  With this long experience, we understand how to manufacture agitated immersion cleaning equipment which can SAFELY handle solvent based cleaning solutions.  The low flash point of many industrial solvents poses a fire risk and the equipment must be designed to both minimize the risk of fire and prevent the spread of fire should one occur.

Magnus equipment is inherently safe as only shop compressed air is used.  Electrical components, electrical enclosures and flammable materials are not utilized as these components would compromise the safety of the equipment.  Components on the cleaning tank are permanently electrically bonded to comply with the NFPA and OSHA requirements and metal-to-metal moving surfaces are eliminated to avoid spark generation.  Should a fire occur, a fusible link reacts and causes the tank lid to automatically close thereby suppressing the flame and minimizing the availability of air which can feed the fire.  Solution filtration is accomplished via the use of a grounded air operated pump which is compatible with the solvent being used.  It’s advisable to utilize an aqueous cleaner where possible, however if the cleaning operation requires a solvent based chemistry, then use equipment which has been specifically designed to handle the solvent chemistry and minimizes the risk and spread of fire.

The ML 2918 cleaning system presented herein is affectionately called a “Senior” as it has been utilized in the cleaning industry for more than 65 years.  The system is suitable for use with solvent based cleaning solutions and is manufactured and supported by MEE in Willoughby, Ohio and spare parts are generally available via next-day delivery.


Operation of the wash tank is conducted via a three-position selector lever on the side of the tank.

    • RAISE : Placing the control lever in the “CENTER” position will “RAISE” the platform.
    • LOWER : Placing the control lever in the “LOWER” position will “LOWER” the platform down to the “Soak” (lowest) position.
    • AGITATION : Placing the control lever in the “Up” or “Agitate” position will lower the platform and activate the “AGITATION” process. Agitation rate is adjustable.


    • 12 gauge, 304 stainless steel, insulated tank construction
    • Stainless Steel tank jackets and cylinder guard
    • Manual, hinged stainless steel lid
    • 35” long x 28.5” wide x 53.75” high overall dimensions
    • 30” long x 22” wide x 20.5” high inside tank dimensions
    • 29” long x 18” wide x 11” high dipping space dimensions
    • 29” x 18” stainless steel grate platform
    • 125 lb. lift capacity (at 100 psi)
    • 40 gallon capacity
    • Pneumatic agitation control
    • In-tank strainer (for pump protection)
    • 25” drain with Stainless Steel Ball Valve
    • Optional integral filtration system compatible with a solvent cleaner including air operated diaphragm pump and filter housing with air regulator, pressure gauge and drain port.
    • Requires 2 to 4 cfm @ 100 psi compressed air
      • Achieves 140-180 strokes per minute (70-90 cycles per minute)
      • 5” to 2.5” travel per stroke


    • FUSIBLE LINK with Dump Solenoid, adds safety when working with flammable materials. A one-piece hinged cover with a 212oF melting point safety link automatically closes when the link melts causing the platform to lower and the cover to close.
    • Permanent electrical bonding per NFPA and OSHA compliance
    • Elimination of metal-on-metal moving surfaces
    • No electrical supply or electrical boxes on the system

Magnetostrictive Ultrasonic Cleaning Succeeds Where Less Powerful Piezoelectric Ultrasonics Fail

Case Study: nPB (N-Propyl Bromide) Replacement

N-Propyl Bromide (nPB or 1-Bromopropane) is a toxic solvent often used in cleaning or vapor degreasing applications. As a suspected human carcinogen and proven animal carcinogen, it has been targeted by the U.S. Environmental Protection Agency for risk evaluation and the European Union has banned it’s use without authorization after July 4, 2020. It is clear that nPB use will soon be banned or greatly restricted and existing users are encouraged to look for a replacement.

Companies presently using nPB are searching for safe, economical and effective replacements for nPB and Magnus Engineered Equipment has been successful in assisting customers to replace nPB with less costly, non-hazardous chemistry while accomplishing the same or improved cleaning. The following is an example where Magnus Engineered Equipment helped a customer develop a cleaning process utilizing nPB and then further helped them replace nPB with non-hazardous, environmentally friendly chemistry.

Highly crosslinked polyurethane is one of the toughest and most durable polymers, and producers often mold this material into usable items such as wheels for roller coasters and skateboards, hoses and automotive suspension bushings. The molds can become contaminated and cleaning the molds is a difficult and time-consuming process.

MEE worked with a customer to develop a chemical cleaning process for their polyurethane molds (steel and aluminum). Previously, a media blasting method was utilized to clean the molds and the process required mold dis-assembly and up to 4 hours of blasting. Using MEE Powersonics, the world’s most powerful magnetostrictive ultrasonic cleaning technology, MEE was able to demonstrate mold cleaning in less than 5 minutes with no mold dis-assembly. (This result was not achievable with less powerful piezoelectric ultrasonic cleaning). With this success in hand, attention was directed at finding a safer chemistry. Powersonics coupled with Acrastrip chemistry by US Polychem was able to replicate the performance achieved with nPB. Acrastrip is a water-soluble, non-hazardous environmentally friendly cleaner that was designed to replace acetone, toluene, MEK, Methylene Chloride, Xylene, MIBK, NPB, Ketones, and other petroleum-based products. In addition, Acrastrip is HAPS free, biodegradable, non-flammable, non-toxic, pH neutral and recyclable.

A Polyurethane mold cleaned with powerful 20 kHz magnetostrictive ultrasonic technology and water-based Acrastrip cleaner

The cleaning tandem of MEE magnetostrictive ultrasonics and Polychem Acrastrip is one example of how MEE can assist customers who are looking to replace nPB with a safer, more cost-effective and quality cleaning operation. MEE Powersonics is the world’s most powerful ultrasonic cleaning technology and can often deliver successful cleaning where less powerful piezoelectric ultrasonics fail.


Engine Remanufacturing

Magnus Engineered Equipment (MEE) has been supplying cleaning equipment to leaders in the remanufacturing industry since the 1950’s. The remanufacturing process begins with a thorough cleaning of engine blocks and associated components so they can be properly inspected.  Removal of carbon, oil and grease, paint and other contaminants in necessary to inspect for microcracks and to make accurate measurements.  In addition, blocks, heads, connecting rods, crankshafts and camshafts are thoroughly cleaned to remove contaminants that can result in premature wear to internal engine components and early engine failure.

MEE has supplied thousands of cleaning systems to the remanufacturing industry and these systems generally employ immersion agitation to clean the substrates.  Recently, there has been interest in incorporating ultrasonic cleaning technology in order to more thoroughly clean oil passages and other hard to clean areas.

Ultrasonic cleaning utilizes transducers which convert electrical energy into acoustic energy in the cleaning solution.  Cavitation bubbles are formed which aggressively and quickly clean the substrate.  MEE supplies 20 kHz magnetostrictive transducers which deliver the highest cleaning power in the industry.  Unlike the more common piezoelectric transducers, magnetostrictive transducers are better suited for cleaning large substrates such as engine blocks, and MEE transducers deliver approximately 25 times more cleaning power than the 40 kHz piezoelectric transducers.

Figure 1 – A typical Heavy Duty Cleaning Tank for Heavy Loads

MEE equipment is well suited for handling large and heavy substrates.  Engine blocks in excess of 5000 lbs can be cleaned via immersion agitation and ultrasonic cleaning.  Figure 1 shows a typical cleaning tank supplied by MEE and Figure 2 and 3 show before and after pictures of engine components cleaned with MEE ultrasonics.  The use of 20 kHz ultrasonic cleaning coupled with immersion agitation cleaning delivers the most thorough and fastest cleaning for engine remanufacturing.


Before Cleaning After Cleaning with 20kHz Ultrasonics

Figure 2: Before and After Pictures of an Engine Block cleaned with 20kHz magnetostrictive ultrasonics

Before Cleaning After Cleaning with 20kHz Ultrasonics

Figure 3: Before and After Pictures of an Engine Components cleaned with 20kHz magnetostrictive

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