COOLING WATER TREATMENT
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DREWGARD CWT - Diesel Engine Cooling Water Treatment

Description

DREWGARD CWT diesel engine cooling water treatment is a patented, non-nitrite corrosion inhibitor for use in lowmedium- and high-speed marine diesel engines. DREWGARD CWT treatment is formulated with organic scale and corrosion inhibitors to protect ferrous and non-ferrous metals from corrosion. Because it provides excellent aluminum protection, it is well suited for high-speed engines. The nonnitrite formulation does not promote bacteria growth. DREWGARD CWT diesel engine water treatment is approved by MAN Diesel SE.

Application and Use

System Preparation

In order to obtain the maximum benefits from DREWGARD CWT treatment, the system should be inspected for deposits and corrosion. If the system is found to be contaminated, it must be chemically cleaned before the treatment program begins. Your Drew Marine representative can provide specific cleaning recommendations. Sacrificial anodes (magnesium or zinc) in the cooling system should be removed prior to adding DREWGARD CWT treatment. These materials are not necessary with the complete chemical program in effect and, in fact, may cause undesirable deposits in circulating water systems.

Dosage

The system should be filled with good quality fresh or distilled water, and where freeze protection is necessary, the proper amount of glycol-based antifreeze should be added. Begin circulating the system water and add DREWGARD CWT diesel engine cooling water treatment at an initial dosage of 8 liters per ton of system water capacity. For a glycol-based antifreeze system, consult your Drew Marine representative for recommended dosage. Circulate for 30 minutes after addition to ensure good distribution and the establishment of a protective film. DREWGARD CWT treatment may be used with waters that have hardness contamination, provided the total hardness levels are below 170 ppm or as otherwise recommended by the engine manufacturer, whichever is less. The chloride level in the cooling system should be limited to 100 ppm or as otherwise recommended by the engine manufacturer, whichever is less.

Testing and Control

The proper concentration of DREWGARD CWT treatment can be maintained using an ampoule test method for silica. Testing should be conducted after adding treatment to confirm that a range of 350-450 ppm silica is present. Normally testing once each week is satisfactory; however, when makeup addition to the system is large or unusual changes are noticed, testing frequency should be increased. When testing for chloride in system water, the sample should be pretreated with Sample Pretreatment using the Chloride LMP Test Kit. Use the Total Hardness Titrets for determining hardness levels. Contact your Drew Marine representative for testing procedures and control.

Typical Physical Properties

Appearance: Clear, blue liquid

Specific Gravity at 25° C (77° F): 1.24

pH (undiluted): 12.5

Flash Point: NA

Freeze Point: 7.7° C (18° F)

Packaging

DREWGARD CWT diesel engine water treatment is normally available in 25-liter containers. Please check with your Drew Marine representative for availability.

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.