WORKSHOP MANUAL W26 Wärtsilä NSD Nederland B.V. Engine type W26
Chapter 1.4
Subject Cooling Water system
Issue date June '00
Cooling water additives, dosage and concentration In order to prevent corrosion in the cooling water system, the instructions of right dosage and concentration of active corrosion inhibitors should always be followed. The information can be found in the table below. Approved cooling water treatment products Product designation Dosage per 1 m³ Concentration of active of system corrosion inhibitor capacity CorrShield NT 4293 10 litres 670-1000 ppm as NO2 (ex-Dearborn 547) DEWT-NC powder 3-4.5 kg 1500-2250 ppm as NO2 Drewgard 4109 16-29 litres 1100-2000 ppm as NO2 Liquidewt 8-12 litres 470-700 ppm as NO2 Maxigard 16-29 litres 1100-2000 ppm as NO2 Cooltreat 651 5 litres 800 ppm as NO2 Marisol CW 8-16 litres 1000-2000 ppm as NO2 Nalco 39 (L) 16-36 litres 550-1200 ppm as NO2 Nalcool 2000 32-48 litres 1000-1500 ppm as NO2 Nalfleet EWT 9-108 2.2-3.4 litres 1000-1500 ppm as NO2 Nalfleet CWT 9-131C 8-12 litres 1000-1500 ppm as NO2 RD11 = RD11M 5 kg 1250 ppm as NO2 RD25 50 litres 710 ppm as Mo Ruostop XM 20 litres 120 ppm as Mo Havoline XLI 50-100 litres 1.6-3.2 w-% of active (ex-ETX 6282) compounds measured with a supplier’s refractometer Dieselguard NB 2-4.8 kg 1500 ppm as NO2 Rocor NB liquid 10-24 litres 1500 ppm as NO2 Vecom CWT Diesel QC-2 6-10 litres 1500-2500 ppm as NO2 Note: For some products the recommended minimum and maximum limits are listed in the table above. Since the amount of active corrosion inhibitors, especially nitrites, is decreasing during the service of the engines, the engine manufacturer recommends the dosage to start from the upper level.
82
