Advantages of ROTRON Chem Tough Blowers

Posted by Optimal Tech on

Why Use The Chemical Process (CP) Option?

  • Gases or environment are corrosive to product components
  • Gases are hazardous or corrosive to the environment
  • Different sealing options are required (Face seal, Nitrogen Purge, Engineered Seal)
  • Sanitary Applications

Standard Features for CP Models

  • NEMA Approved
  • CE conformity (non-XP models)
  • UL and CSA approved
  • C-face mount
  • Permanently sealed bearings
  • Shaft end play, run out and perpendicularity requirements above NEMA standards
  • Dual voltage and dual frequency to maximize use worldwide
  • Single shafted totally enclosed fan cooled (TEFC) and explosion proof (XP) models
  • Double Shafted Open Drip Proof (ODP) models with dual internal fans for circulation
  • Class I Group D minimum on explosion-proof motors; many are Class I Group D, Class II F and G

Typical Sealing Options

Lo-Leak LIP Seal

The Lo-Leak Lip Seal option is available to control gas leakage and is standard on our Chemical Processing Regenerative Blowers. The lip seals prevent leakage to the motor shaft mating surfaces sealed with high temperature RTV. The castings are vacuum impregnated to prevent leakage through the castings.

For further minimization of gas leakage on all CP models, a pair of face seals work against each other on opposite sides of a common mating ring to effectively reduce gas leakage at the motor shaft. The face seals are continually lubricated from a reservoir housing to prolong seal life. The seal is completed by installing the blower to motor bolts with 0-rings and sealing the covers to the housing with an RTV sealing compound. 0-rings are also placed between the flanges. All of our castings are vacuum impregnated.

Hermetically Sealed Mag Drive Option  

On our CP101 units, a magnet drive option has been an alternative for complete gas containment. 0-rings are used throughout the product, and magnets attached to the motor shaft spin magnets inside the blower without shaft penetration.   

Nitrogen Purge/Blanket Option  

The nitrogen purge option is a carrier designed to accept a nitrogen line which will purge the space around the shaft. Purges can be designed to bleed the nitrogen into the process called a blanket, or the carrier can have a second tap to carry away the leaking contaminants.

Chem-Tough Regenerative Blowers

Chem-Tough Chemical Resistance  

To stand up in corrosive and hazardous environments, chemical processing blowers have to be tough. That's why AMETEK ROTRON routinely applies Chem-Tough, ROTRON's own engineered and proprietary process, whenever we build blowers for handling chemical (vapor) streams. Chem-Tough combines the advantages of aluminum oxide ceramic and selected fluorocarbons to give ROTRON blowers unheard-of levels of chemical resistance, hardness, abrasion resistance, permanent lubricity and more.   

Chem-Tough at Work  

Chem-Tough employs the advantages of anodizing, hard coat plating, low-friction polymers and dry lubricants to become an integral part of the blower's molecular structure. Specifically, Chem-Tough first converts the aluminum surface to aluminum oxide, forming a new ceramic-like surface. The water in the ceramic is replaced with Teflon, adding a multi-functional dimension to the surface; in the process, the aluminum crystals expand and form anchor crystals that remain hygroscopic for a short time. Then, under controlled conditions, particles of the specified polymer are infused to interlock with these anchor crystals. The new surface extends .5 mil above and below the original aluminum surface - and forms a permanent molecular bond with the metal.   The result: a plastic/ceramic surface that's harder than steel, is continuously lubricating, and resists damage from chemicals like no other. The kind of protection you need for your chemical processing blowers.   

The ROTRON Advantage

Through this unique proprietary process, Chem-Tough gives ROTRON blowers these advantages:   

Outstanding Chemical Resistance  

Time after time, Chem-Tough finishing shows extremely high resistance to most common chemicals, as well as dramatically improved corrosion resistance over regular hard anodizing. Chem-Tough allows aluminum to achieve an equivalent corrosion resistance as Teflon. 90 day immersion in acid or alkaline solution (pH 4.0-8.5) has no effect; neither does prolonged exposure to salt water. Far exceeds military specification requirements for salt spray.   

Abrasion Resistance Equivalent to Steel  

Excellent for smooth surfaces, Chem-Tough surface conversion provides higher wear resistance than either case-hardened or hard-chrome plate. Rub any other metal against the Chem-Tough finish, and the metal will show nothing but the slightest wear. Chem-Tough provides a perfect bond to the parent metal.   

Increased Hardness  

With an equivalent hardness of Re 40-60, Chem-Tough is approximately file-hard- the hardness of nitrated steel. Because the Chem-Tough surface becomes an integral part of the metal, it simply cannot peel or chip- neither can it be scratched, flaked or nicked under ordinary circumstances.   

Permanent Dry Lubricity

By infusing polymers into aluminum, Chem-Tough gives the resulting surface a high degree of permanent dry lubricity and resistance to moisture. The polymers also level off surface asperities, significantly reducing surface tension. 

The result: blowers converted with Chem-Tough have a longer life, operate more efficiently and require less maintenance.

Applications Include:

  • Agricultural
  • Environmental
  • Foundry
  • Manufacturing
  • Refineries
  • Air Pollution Control
  • Instrumentation
  • Plastics Handling
  • Water Pollution Control
  • Material  Handling
  • Packaging
  • Pharmaceutical
  • Aqueous Precision Cleaning


Information provided by AMETEK DFS

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