Description

B.W.T. - L is a highly effective liquid deposit and corrosion inhibitor for treating steam generating systems.

Features:

B.W.T. - L is a liquid combination of antiscalant, sequestrants, organics and oxygen scavengers and metal passivators.

The deposit control components in B.W.T. - L are organophosphorus compounds and anionic polymeric dispersants. These polymers will inhibit the formation of hardness-based scale crystals and disperse the resulting aborted scale fragments in the boiler water.

Iron in the boiler water and feedwater circuit is kept in the soluble ferrous form by an effective iron reducing agent. This action allows the specific iron sequestrants in B.W.T. - L to complex iron and remove it via blowdown. The combination of iron reducing agents and sequestrants prevent iron from forming insulating deposits.

B.W.T. - L does not contain any phosphate or poly-phosphate, so the sludge produced in the boiler is minimal.

Physical characteristics:

Appearance: Hazy brown liquid.

Odor: None

Solubility in water: Complete Flash point: None

pH: >10

Feeding:

The preferred feedpoint for B.W.T. - L is to the feedwater line, neat or as a diluted solution, downstream of the feedwater pump, through stainless steel piping and injection quill.

The dosage is dependent upon feedwater analysis as well as boiler operating conditions. In most cases a dosage of approximately 50-100 ppm of B.W.T. - L is adequate.

For desalinated, de-ionized, de-mineralized or softened water 50ppm are enough.

For hard water or utilities water the chart below should be followed:

*Maintain the product at the above limits. Testing is done with a special test kit, which our company offers its customers.

Description

OXYAMINE is a new technology oxygen scavenger designed to substitute Hydrazine and Sulfite, which are traditionally, used for this purpose in all boilers high and low pressure.

Benefits

• It is suitable for boilers up to 125bar.

• It is a very efficient oxygen scavenger.

• Forms a passivating protective film (F3O4 – Magnetite).

• It does not increase the total dissolved solids.

• It is sufficiently volatile so that it can protect against oxygen corrosion in the entire boiler system including the steam – condensate return lines.

• Due to its unique property of being volatile it controls carbon dioxide corrosion in the condensate return line systems.

• The product is non-toxic.

Limitations of Sulfite and Hydrazine

Equations 1 and 2 show the reaction of Sulfite and Hydrazine with oxygen.

                                  2 Na₂SO₃  + O₂  = 2 Na₂SO₄

                                 N₂H₄ + O₂ = N₂ + 2 H₂O

Each however has limitations.

Sulfite increases the total dissolved solids in the boiler water through the formation of Sodium Sulfate.  Therefore boiler blow down must be increased resulting in greater chemical and fuel costs.  Sulfite is only an oxygen scavenger and does not form a protective film of black magnetic iron oxide (F₃O₄, magnetite).  This magnetite film passivates and protects the metal surfaces.

Hydrazine is not as effective as sulfite is as an oxygen scavenger and it is very toxic.

Hydrazine has been classified as a suspect carcinogen by OSHA and NIOSH.  It has been regulated by the FDA to exclude any use that might come in direct contact with food.

Both Hydrazine and Sulfite are non – volatile.  (Hydrazine has limited volatility).  and they do not protect the steam – condensate return line system. It is obvious that the need for new oxygen scavengers is essential.

Application, dosage & control

For an untreated system an initial dose of 100-200 ml per day then dosing should

be controlled so that the deha residual in the condensate is between 0,1 – 04, ppm

according to the table below:

   Test Result Condesate PPM DEHA