Product information

Specification

Approvals

• Approved by all major engine manufacturers

Directions for use

NALFLEET™ Rocor NB Liquid is a highly effective corrosion inhibitor for the common ferrous and non-ferrous metals in cooling water systems. The stable oxide film that is formed prevents corrosion caused by electrolytic action between dissimilar metals used in the system. NALFLEET™ Rocor NB Liquid has been field tested and found to have no detrimental effects on non metallic substances such as seals, glands, packing, hoses, gaskets etc., normally used in these systems. The compound is alkaline and so will suppress acid corrosion, which would otherwise result in corrosion damage such as pitting. However, the alkalinity control is such that even if the product is accidentally overdosed, the pH of the water will remain within limits. The metals which would be affected by extremes of alkalinity or acidity are protected. In cases where systems are contaminated with oil and/or scale they should be cleaned before starting to apply NALFLEET™ Rocor NB Liquid. There are suitable WSS products to carry out the cleaning. Degreasing should be carried out using UNITOR™ Seaclean Plus and descaling by using UNITOR™ Descalex. Refer to Water Treatment handbook. Freeze protection can be required if the vessel is to be laid up in cold areas. NALFLEET™ Rocor NB Liquid can be used in conjunction with glycols to provide suitable freeze protection. If the system contains zinc galvanized parts, it is advisory to clean the system with Descalex prior to commencing the treatment.

NALFLEET™ Rocor NB is not suitable for use in cooling systems containing aluminium components.

For general guidance where aluminium is present:

No aluminium present - Use Engine Water Treatment 9-108 or Rocor NB Liquid

<10% Aluminium - Use NALFLEET 2000 or Cooltreat AL

>10% Aluminium - Use Cooltreat AL

Dosing method

NALFLEET™ Rocor NB Liquid should be dosed to a suitable point in the system. If the expansion tank is used then adequate circulation must be assured.

Sampling and testing

The Spectrapak Test Kit provides the necessary equipment to carry out the control tests. Obtain a representative sample of the cooling water. Carry out the tests immediately after sampling (following the instructions given in the Test Kit) and log the results in Waterproof. The results should be sent to WSS as stated in the Waterproof instructions. Use the dosage chart overleaf to adjust treatment to obtain the optimum level. It is important that testing is carried out at least once per week, to ensure levels of treatment are correct.

Dosage and Control

Initial dosage for an untreated system is 9 litres of NALFLEET™ Rocor NB Liquid/1000 litres of untreated distilled/technical water. This will bring the treatment up to the minimum level of 1000 ppm nitrite. The dosage chart given below is for convenience in calculating the amount of NALFLEET™ Rocor NB Liquid required to bring the treatment level to the suitable point between the minimum and maximum - this being 1440 ppm nitrite.

Normal nitrite limits: 1000-2400 ppm nitrite (NO2)

N.B.Buffering agents in NALFLEET™ Rocor NB Liquid maintain pH values within suitable limits when the product is dosed as recommended. Normal pH should be maintained between 8.3 and 10 by the treatment. The engine manufacturer's recommendations for water quality should always be complied with.

Chloride levels should always be as low as possible. Most engine manufacturers recommend a maximum of 50 ppm chlorides. For this reason, Wilhelmsen Ships Service recommends the use of distilled water as make-up.

产品特性

• 液体产品
，易于使用

• 通过在金属表面上形成氧化膜，可以防止电解腐蚀

• 有效防止气蚀和腐蚀

• 与软管，垫圈和密封件兼容

优势

• 主要柴油发动机制造商批准

• 简单的控制测试

该产品可用于许多类型的封闭式再循环系统中的腐蚀抑制
，例如：

• 柴油发动机冷却水系统

• 压缩机冷却水系统

• 集中冷却系统

• 热水加热系统

• 辅助机械冷却系统

订购信息

Product number                           Product name

571356                                       ROCOR NB LIQUID 25 LTR

亚硝酸盐，氯化物和pH值测试工具包。

Product Number                           Product name

739466                                       SPECTRAPAK 309

认证

• 获得所有主要发动机制造商的认可

• 挪威国家公共卫生研究所批准用于冷却水用于蒸发器加热的系统

使用说明

NALFLEET™ Rocor NB Liquid 是一种高效缓蚀剂
，适用于冷却水系统中常见的黑色金属和有色金属。形状稳定的氧化膜防止由系统中使用的不同金属之间的电解作用引起的腐蚀
。NALFLEET™ Rocor NB Liquid 经过现场测试
，发现对通常用于这些系统的非金属物质（如密封件，密封管，填料，软管，垫圈等）没有任何不利影响
。该化合物是碱性的，因此可以抑制酸腐蚀，否则会导致腐蚀，如点蚀。然而，碱度控制使得即使产品意外地过量
，水的pH也将保持在限度内
。受极端碱度或酸度影响的金属受到保护
。如果系统被油污和/或水垢污染，应在开始使用NALFLEET™ Rocor NB Liquid. 之前进行清洁
。有合适的WSS产品可以进行清洁。脱脂应使用UNITOR™ Seaclean Plus进行，并使用UNITOR™Descalex进行除垢。

请参阅水处理手册。如果要将容器放置在寒冷地区，有时需要使用防冻剂，因此NALFLEET™Rocor NB Liquid可与防冻产品一起使用
。

如果系统包含锌镀锌部件

，建议在开始处理前用Descalex清洁系统
。

NALFLEET™Rocor NB 不适用于含铝组件的冷却系统
。

加药方法

NALFLEET™ Rocor NB Liquid 应加入系统中合适的位置。如果使用膨胀水箱
，则必须确保充分的循环

。

采样和测试

Spectrapak测试套件提供了执行控制测试所需的设备
。获得冷却水的代表性样品。取样后立即进行测试（按照测试工具包中的说明）并将结果记录在防水中
。结果应按照防水说明中的说明发送至WSS
。使用背面的剂量图来调整治疗以获得最佳水平
。重要的是每周至少进行一次测试，以确保治疗水平正确。.

剂量和控制

未处理系统的初始剂量是9升NALFLEET TM Rocor NBLiquid / 1000升未处理的蒸馏水。这将使处理达到1000ppm亚硝酸盐的最低水平。下面给出的剂量图是为了方便计算NALFLEET™Rocor NB液体的量，使处理水平达到最小值和最大值之间的合适点- 这是1440 ppm亚硝酸盐。

正常亚硝酸盐限量：1000-2400 ppm亚硝酸盐（NO2）

当产品按推荐剂量给药时
，NALBLEET™Rocor NB液体中的N.B.缓冲剂将pH值保持在合适的限度内。通过处理
，正常pH值应保持在8.3和10之间
。应始终遵守发动机制造商对水质的建议。

氯化物含量应始终尽可能低
。大多数发动机制造商建议最多

50 ppm氯化物

。因此
，Wilhelmsen Ships Service建议使用蒸馏水作为补水。