Bilfinger designs and manufactures a wide range of screens for media retention. Among these innovative products is a line of Johnson Screens® flat screens used in down-flow or up-flow systems to retain the often costly media and to provide a collection area for the process flow across the entire vessel as diameter or length.
Because of their strength, durability and flow characteristics, our Johnson Screens® support grid systems are widely used in hydrotreaters, desulfurizers, molecular sieves, gas sweeteners and other adsorption systems.
There are multiple advantages in using our screens for demanding media retention applications:
- Extremely strong: made of welded wires and rods, they have exceptional resistance to collapsing or buckling even in operations such as hydrocracking and de-sulfurisers, where screens must withstand loads of 350 kPa or more
- Precise media retention: slots can be as narrow as 0.05 mm / 0.002 in to dependably retain even very small size catalyst, resin or molecular sieve. Despite the narrowness of these individual slots, the screen has a much higher total open area than grids using wire mesh on grating
- Stable interface: unlike wire mesh, Johnson Screens® support grids directly retain the media without an intermediate layer of inert balls. The smooth surface of the screen reduces abrasion
- Comes equipped with support beams, catalyst transfer pipes, manways, rope packing, bolting and all necessary accessories
Bilfinger Water Technologies Inc.
New Brighton, MN 55112