PERFORMANCE BOILER WATER TREATMENT
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DREWPLEX AT - Boiler Water Treatment
Description
DREWPLEX AT boiler water treatment is a phosphate-based treatment combined with synthetic polymers providing the ultimate in simplicity, system flexibility and treatment control for motor vessel auxiliary and exhaust gas economizer boilers. DREWPLEX AT boiler water treatment provides a cleaner boiler by allowing greater tolerance of feedwater quality fluctuations. The polymers in DREWPLEX AT boiler water treatment serve as deposit control agents by adsorbing onto the surface of boiler water precipitates, keeping the particles soft, nonadherent and easily transported through blowdown. Iron dispersancy is also achieved with DREWPLEX AT boiler water treatment by sequestering deposits caused by iron. In addition to combining alkalinity control, scale inhibitors and deposit control, DREWPLEX AT boiler water treatment provides protection from corrosion in the afterboiler section caused by low pH. When coupled with Drewplex OX corrosion inhibitor, DREWPLEX AT boiler water treatment provides the most modern, safe and effective approach to a motor vessel boiler water treatment program. DREWPLEX AT treatment is also used with AMERZINE corrosion inhibitor, which utilizes hydrazine as the oxygen scavenger. DREWPLEX AT boiler water treatment is NSF registered as a nonfood compound under category G6, a water treatment product used in boiler steam lines for food contact in food processing establishments. It is also registered under category G7, a water treatment product used in boiler steam line for nonfood contact in food processing establishments.
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Features |
Benefits |
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Dispersant properties |
Keeps particles in suspension Prevents scale buildup on tubes Promotes efficient heat transfer |
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Crystal modifiers |
Soft sludge easily removed by blowdown |
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Sludge conditioning |
Cleaner boiler Less downtime Fewer acid cleanings Lower maintenance costs |
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Neutralizing amine |
Condensate pH corrosion control |
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Phosphate and alkalinity treatment |
Scale inhibition |
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Simple feed and control |
Operator ease |
Application
Dosage, Testing and Control: Continuously dose diluted DREWPLEX AT treatment with diluted DREWPLEX OX corrosion inhibitor or AMERZINE corrosion inhibitor using the DREW™ beta metering system to the feedwater line downstream of the feedwater recirculation offtake, which returns water to the hotwell or cascade tank. If there is no feedwater recirculation, dose continuously to the feed pump suction. A less preferred method is a gravity feed flowmeter arrangement because volatiles can be lost as the recirculated water is returned to the hotwell or cascade tank. If a gravity feed flowmeter arrangement is used, the dosage point should be to the hotwell or cascade tank. The chemical feed line should extend below the normal water level (approximately 1 meter) and as close to the feed pump suction as possible. DREWPLEX AT treatment should be diluted with distilled water or condensate in the dosage tank and dosed continuously over a 24-hour period in keeping with system demands. Daily dosage will depend on system capacity, purity and quality of condensate returns and the quality and amount of makeup water to the system. The recommended initial dosage of DREWPLEX AT treatment is 2.5 to 5 liters per ton of water in the boiler system. Once the system has been initially dosed and is in operation, the daily hydrate alkalinity test result determines the necessary dosage. A dirty boiler will demand more chemical due to the flushing out of dirty boiler water that settled to the bottom of the boiler system during shutdown. This, in turn, will necessitate additional blowdown and chemical. Very large systems or those with unusual operating conditions may have proportionately higher chemical requirements.
DREWPLEX AT treatment dosage and blowdown are determined by simple boiler water tests. Testing for hydrate alkalinity in the boiler water determiness the DREWPLEX AT treatment dosage. Testing for neutralized conductivity in the boiler water determines the blowdown. For details on testing procedures, refer to the DREWPLEX AT treatment and DREWPLEX OX corrosion inhibitor control and dosage chart, or the DREWPLEX AT treatment and AMERZINE corrosion inhibitor control and dosage chart, or contact your local Drew Marine representative.
Makeup Water Quality: The primary purpose of a boiler water treatment program is to keep the boiler free of deposits and corrosion. The most efficient method for keeping the boiler free of deposits is to provide distilled makeup water. DREWPLEX AT boiler water treatment is formulated to handle feedwater hardness upsets.
Blowdown: Good blowdown procedures are essential to the effectiveness of any boiler water treatment program and should be carried out according to the boiler manufacturer's instructions. Surface blowdown is necessary to reduce dissolved and suspended solids. Normal maintenance surface blowdown is sufficient up to a neutralized conductivity of 700 μS/cm. Above a neutralized conductivity of 700 μS/cm, the frequency of surface blowdown should be increased. In addition, weekly flash-blowdown of the header drains or steam separator (where applicable) is recommended to minimize sludge accumulations.
Typical Physical and Chemical Properties
Appearance: Light brown liquid
Freezing Point: -8.8° C (16.0° F)
Specific Gravity at 25° C (77° F): 1.080
pH (Neat): 13.4
Flash Point (PMCC): None
Freeze/Thaw Stability: Complete
Packaging
DREWPLEX AT boiler water treatment is available in 25- liter Pails
Important Information
Ashland maintains Material Safety Data Sheets on all of its products. Material Safety Data Sheets contain health and safety information for your development of appropriate product handling procedures to protect your employees and customers.
Our Material Safety Data Sheets should be read and understood by all of your supervisory personnel and employees before using Ashland products in your facilities.