HYDROFLOW ™ NUT SHELL FILTER
WALNUT SHELL FILTERS

HYDROFLOW™

The HYDROFLOW™ deep bed nut shell filter brings major improvements to filtration technology. By utilizing “Black Walnut Shells” as the media, the HYDROFLOW™ removes greater than 98% of oil contaminants and suspended solids from a water stream. Specifically suited for filtering water used for oil field flooding, refinery disposal and off shore disposal, HYDROFLOW™ also has applications in the chemical, petrochemical, metal working and power generation industries.

Here are some of the HYDROFLOW™ features and benefits:

• A positive media cleanup which prevents bed channeling and mud balling, thereby, giving longer filter life and eliminating bed replacement.
• High flow rates in a compact design which reduces space requirements.
  A very low scrubbing or backwash fluid volume which results in a substantial reduction in disposal cost and smaller tank requirements.
• Elimination of compulsory chemicals for fine removal efficiency or filter cleanup, thereby reducing operation and maintenance cost.
• Does not require clean water for filter cleanup, allowing all filtered water to be used and eliminating the need for clean water backwash storage tanks.
• Simple automatic design functions provide for low operator, maintenance and training costs.
• No gas or air scour required, reducing corrosion problems and providing a safer operating environment.
• Positive retention of the media in the vessel which prevents media loss and disposal problems.
• The media is “force set” after clean-up which prevents the media from stratifying and provides a homogeneous media bed. If the bed is allowed to settle by gravity, the small media particles will be on the top and the large partials will be on the bottom, thus all of the filtration will occur within the top few inches of the media bed. By “force setting” the full bed volume can be used for dirt holding. This will provide longer run times and less scrubbing or backwash fluid, thereby reducing disposal cost.
• Upstream flow is not interrupted. This lowers feed tank size and cost.
• The feed pump is never “dead headed”. This eliminates pump damage, high pump wear and maintenance cost.
• Does not require continuous venting. This allows more fluid for end use and reduces tank requirements or disposal cost.
• Has a media depth of 58 inches. Allowing the filter to always operate above the minimum efficiency depth of 48 inches and providing more dirt holding capacity, more run time and less backwash fluid to dispose of.
  

In order to reduce the price and cost of the HYDROFLOW™ NUT SHELL filtration systems, Absolute Filtration Industries Corporation has designed in the following cost saving features:

• The media retention screens are constructed of tubular screens wound around perforated pipe, rather than a flat screen. This allows for a far simpler installation by not requiring that the screens be sealed welded into the bottom of the vessel. Flat screens can have a problem with thermal expansion because they are welded into the vessel shell or heads and if a failure does occur, will need to be cut out and new screens welded back in. Also, the design differential pressure across the flat screen is normally only 25 to 35 psid, however the maximum feed pump pressure can be 60 to 70 psig, thus if any problem occurs that brings the differential pressure above 35 psid, the screens will crush. The differential pressure of the HYDROFLOW™ tubular screens is always above the maximum output pressure of the pump, but never below 80 psid.
• The cost to install flat screens and all the necessary under screen supports can be four times as high as the cost of putting in the HYDROFLOW™ tubular media support screens. Example: For a medium size filter, the cost to install a flat screen made of 316L stainless steel is $32,000.00; while the tubular screens in a HYDROFLOW™ is only $8,300.00.

• Not only do you get a better product, but
  lower maintenance and a much lower price.

• Multigrade Media Absolute filtration's unique "Multigrade" black walnut shell media is the best nutshell media on the market today. It provides the highest loading volume and at the same time, the highest removal efficiency.
  
  

• The HYDROFLOW™ filter uses eastern black walnut shells as its filter media. Any material used as a filter media, in addition to being strong, that is resisting rupture, must also have a high modulus elasticity, that is resist deformation and recover its size and shape after deformation. The durability and quality characteristics of the eastern black walnut shell are proven by its ability to stand up and perform. It is further emphasized in the following chart showing various materials and their modulus of elasticity in pounds per square inch:
  

  Material	Modulus Elasticity p.s.i.
  BLACK WALNUT SHELLS	170,000
  Pecans Shells	10,000+
  English Walnut Shells	10,000+
  Coconut Shells	10,000+
  Peach Pits	10,000+
  Apricot Pits	10,000+
  Olive Seeds	10,000+

The HYDROFLOW™ media is type 3 in military specifications MIL-G-5634A and meets all quality requirements concerning same. By using this very high quality media, the attrition rate will be lower and cost of replacement media, as well as, operator maintenance time will be reduced.

Absolute Filtration Industries Corp. has established a relationship with a company that produces a highly elastic ceramic coating that provides excellent abrasion and corrosion protection in critical service environments. With this coating we are able to reduce the requirements for stainless steel in most of our piping. By reducing the stainless steel we can lower the piping cost by as much as 40%. This will reduce the price you pay for a HYDROFLOW™ filter.

By all of these price and cost savings, we feel that we are able to provide the very best walnut shell filter on the market today, at the very lowest price and cost.