B ulletin on POROUS MEDIA
1
&utzeu*t OH, POROUS MEDIA by CARBORUNDUM TRADE MARK NO. 4 AUGUST, 1949 j POROUS BOTTOM T R I C K L E S . . . Λ One of the first installations of ** ALOXITE plates was in a shallow filter designed for a 12" rise of wash water. By eliminating graded gravel the wash rate was doubled to 24" and other favorable results realized. Λ Standard ALOXITE porous plates serve one foot square of filter area. Other rectangular shapes are manufac- tured regularly for old or new filters not built to even foot dimensions. Κ In a large installation of horizontal ^ pressure softeners, zeolite losses through the underdrains amounted to a considerable figure. Through the simple installation of ALOXITE plates this ex- pensive loss was stopped completely. Porous Plate Bottom Fits All Filter Structures Adaptability features the ALOXITE aluminum oxide porous bottom. Since its introduction 15 years ago, not a single structural condition, either new or old, has prevented its usage. Thus, the basic benefits resulting from graded gravel elimination are available to every situa- tion. Such troubles as upset beds, mud balls, excessive wash water, and loss of filter media disappear. Advantages of the ALOXITE underdrain system apply to all three classifications of installations: OLD FILTERS. ALOXITE plates can be installed in any structurally-sound old filter. Rehabilitation cost is minimized because fewer alterations to existing structures are required. This is experi- enced-proved! Many of the more than 200 ALOXITE bottom installations are i n o l d filters. NEW PLANTS. The adaptation of ALOXITE plates to a new design struc- ture is simple. It also affects an impor- tant initial cost saving. With graded gravel eliminated, filter bed depth is decreased to permit reduction in vertical dimensions. SPECIAL INSTALLATIONS. Special plates are made to fit the periphery of any circular filter, either gravity or pres- sure type. Single discs are supplied for small niters or softeners up to 36" in diameter. Trapezoidal shaped plates are made for annular shaped filters. Properties of ALOXITE Porous Media MATERIAL Ceramically bonded crystalline aluminumfexicl· grain of controlled sizes. Filter Underdrains . ». coarse and very coarse. Direct Filtration · · · range from very fine to medium· Diatomite Support·· «range from fine to medium. Air (gas) Diffusion··· range from fine to coarse (permeability from 10 to 120.) GRADES (Pore> size) In Water and Air··· insoluble at all normal operating temperatures. In Acids.••generally resistant at all operating temperatures, except to hydrofluoric acid. In Alkaline Solution»··· ceramic bonds are progressively soluble with time and temperature increases. SOLUBILITY STRENGTH Transverse breaking strength is relatively good ranging from 1000 lbs./sq. in· (coarse grades) to 3O00 lbs./sq. in. (fine grades). REFRACTORINESS All grades withstand up to 900° C. without softening. THERMAL SHOCK RESISTANCE Withstand changes up to 20° C./hr. (Where more severe heat shock exists, ceramically bonded silicon carbide porous media are available.) POROSITY Ratio of pore volume to total volume of all grades approximately 35%. WEIGHT Approximately 0.09 Ibs./cu. in. 'Carborundum" and "Aloxite" are registered trademarks -which indicate manufacture by The Carborundum Company Λ Substantial savings in operation and ^ maintenance costs are a primary ad- vantage of porous plate underdrains. In new installations first cost, too, may be much lower. TECHNICAL DATA on porous media and their application is available on request. You may obtain any or all of the following engineering bulletins by writing Dept. A-119. No. 1—Aeration of Sewage and Water. No. 2—Underdrain Systems fjr Filters and Softeners. No. 3—General Catalog information. THE CARBORUNDUM COMPANY Refractories Division PERTH AMBOY, NEW JERSEY VOLUME 2 7, NO. 4 7 . N O V E M B E R 2 1, 19,9 3531
Transcript of B ulletin on POROUS MEDIA
&utzeu*t OH,
POROUS MEDIA by CARBORUNDUM
TRADE MARK
N O . 4 A U G U S T , 1 9 4 9
j POROUS BOTTOM TRICKLES.. . Λ O n e of the first installations of ** ALOXITE plates was in a shallow
filter designed for a 12" rise of wash water. By eliminating graded gravel the wash rate was doubled to 24" and other favorable results realized.
Λ Standard ALOXITE porous plates serve one foot square of filter area.
Other rectangular shapes are manufactured regularly for old or new filters not built to even foot dimensions.
Κ In a large installation of horizontal ^ pressure softeners, zeolite losses through the underdrains amounted to a considerable figure. Through the simple installation of ALOXITE plates this expensive loss was stopped completely.
Porous Plate Bottom Fits All Filter Structures Adaptab i l i ty features the A L O X I T E aluminum oxide porous bot tom. Since its introduction 15 years ago, no t a single structural condition, either new or old, has prevented its usage. Thus , the basic benefits resulting from graded gravel elimination are available to every situation. Such troubles as upset beds, mud balls, excessive wash water, and loss of filter media disappear. Advantages of the ALOXITE underdrain system apply to all three classifications of installations:
OLD FILTERS. ALOXITE plates can be installed in any structurally-sound old filter. Rehabilitation cost is minimized because fewer alterations t o existing structures are required. This is experi
enced-proved! Many of the more than 200 ALOXITE bottom installations are in old filters.
N E W PLANTS. T h e adapta t ion of ALOXITE plates to a new design structure is simple. It also affects an important initial cost saving. W i t h graded gravel eliminated, filter bed depth is decreased to permit reduction in vertical dimensions.
SPECIAL INSTALLATIONS. Special plates are made to fit the periphery of any circular filter, either gravity or pressure type. Single discs are supplied for small niters or softeners up to 36" in diameter. Trapezoidal shaped plates are m a d e for annular shaped filters.
Properties of ALOXITE Porous Media MATERIAL Ceramically bonded crystalline aluminumfexicl· grain of controlled sizes.
Filter Underdrains . ». coarse and very coarse. Direct Filtration · · · range from very fine to medium· Diatomite Support · ·«range from fine to medium. Air (gas) D i f fus ion· · · range from fine to coarse (permeability from
10 t o 120.)
GRADES (Pore> size)
In Water a n d A i r · · · insoluble at a l l normal operating temperatures. I n Ac ids. • •genera l ly resistant a t al l operating temperatures, except to
hydrofluoric acid. I n Alkal ine Solution»·· ·ceramic bonds are progressively soluble with
time and temperature increases.
SOLUBILITY
STRENGTH Transverse breaking strength is relatively good ranging from 1000 lbs./sq. in· (coarse grades) t o 3O00 lbs./sq. i n . (fine grades).
REFRACTORINESS A l l grades withstand up to 900° C. without softening.
THERMAL SHOCK RESISTANCE
Withstand changes up t o 20° C./hr. (Where more severe heat shock exists, ceramically bonded silicon carbide porous media are available.)
POROSITY Ratio of pore volume to total volume of a l l grades approximately 35%.
WEIGHT Approximately 0.09 Ibs./cu. in.
'Carborundum" and "Aloxite" are registered trademarks -which indicate manufacture by The Carborundum Company
Λ Substantial savings in operation and ^ maintenance costs are a primary advantage of porous plate underdrains. In new installations first cost, too, may be much lower.
TECHNICAL DATA on porous media and their application is ava i lab le on request. You m a y obta in any or all of t h e fol lowing engineering bul le t ins b y w r i t i n g Dept . A-119. N o . 1—Aeration of Sewage and Water . N o . 2—Underdrain Systems fjr Filters
and Softeners. N o . 3—General Ca ta log information.
THE CARBORUNDUM COMPANY Refractories Division
PERTH AMBOY, NEW JERSEY
V O L U M E 2 7, N O . 4 7 . N O V E M B E R 2 1, 1 9 , 9 3531
