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FOSTREAT

 

FOSTREAT is a dry powdered phosphate based treatment used to precipitate calcium hardness as a non adherent sludge. Fostreat is a free-flowing white powder which is readily soluble in water.

 

PURPOSE

 

When fostreat is added to the boiler water under proper conditions it supplies the necessary phosphate to chemically react with calcium hardness to prevent the formation calcium carbonate, sulphate and/or silicate scales. The reaction between calcium and phosphate produces a finely divided non adherent sludge (calcium phosphate)which remains suspended in the boiler water and removed through blowdown.

 

ADVANTAGES

 

1. Scale problems eliminated. Sludge problems greatly reduced.
2. Easily dissolves in water to prepare feed solutions.
3. 100 % active material.
4. Dry product minimizes shipping cost.
5. Feed solutions up to one pound per gallon possible.

 

FEED REQUIREMENTS

 

FOSTREAT is used in controlled amount so as to maintain a free phosphate residual in the boiler water. The control limits for phosphate normally are in the 20 to 60 ppm range. Exact parameters will be sent by our representative for your installation. The feed rate for FOSTREAT will vary depending upon the calcium hardness of the make up water.

 

METHOD OF FEEDING

 

Dissolve in warm water and slug feed intermittently to the boiler feed water line or with a continuous feed pump to the boiler. Fostreat can be mixed with other treatment chemicals used for internal treatment. Material of construction of the feed equipment are not critical, but dissimilar metals should be avoided.

 

STORAGE AND HANDLING

 

Store in a dry place, keep container closed when not in use. Avoid contact with skin. Wash with large quantities of water. In case of contact with eyes, treat with large volumes of water and see a physician.

 

DOSAGE CHART FOR ROCHEM FOSTREAT

 

1. Find your boiler operating pressure on left.
2. Find your phosphate test results as ppm PO4 across the top.
3. Read across from your operating pressure until you reach the column with your ppmPO4 results. This square will give you the correct dosage of Rochem Fostreat to reach the correct protection for your boiler.


...................................................................................................Dosage table in grams/ton

 

............ ...........Boiler type.............................................................................. Test Results phosphate as ppm PO4
................................................................0-10................... 10-20............... 20-40..................40-60................60-80................ Over 80
....................Below 400 psi.................. 90 ........................70.................... 40...................... 10............ Satisfactory......... Blow down
.........................(28 bar)................................................................................................................................ .no dose

......................400-600 psi ....................50........................ 30........ Satisfactory.......... No dose.......... High blow...........Blow down
......................(28-42 bar).................................................................... no dose.......................................... down

......................600-800 psi.................... 60........................ 20........ Satisfactory......... No dose........... High blow.......... Blow down
......................(42-59 bar).................................................................... no dose........................................... down

.................Double pressure................ 40........................ 30........ Satisfactory....... Satisfactory........ No dose............ Blow down
...................primary system

 

.................Double pressure................ 80 ........................60................ 30................. Satisfactory...... No dose............ Blow down
..................primary system .

 

 

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