NORSOK

NORSOK is suitable for both corrosion and weathering testing. Its cycle is 168 hours long, and it runs for 25 cycles (i.e., 25 weeks total). Each cycle consists of 72 hours of salt spray, followed by 16 hours drying in air, and then 80 hours of UV condensation (ASTM G53). 

The NORSOK test was developed for the offshore oil industry, particularly the conditions found in the North Sea. The test is part of the NORSOK M-501 standard. 

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The hydrocarbons selected were heptane, cyclohexane, and toluene one such mixture is now specified within the fluids for liquid aging assessments according to Norwegian NORSOK M-710 Rev. 2 standard for qualification of offshore duty elastomer seals. 

Norwegian standard NORSOK M-710 Rev. 2, Qualification of non-metallic sealing materials and manufacturers, October 2001. 

As an example, let s look at NORSOK, a Norwegian standards organization. Its view is that noise from SRVs should not be considered during design ... 

The velocity effects on CO2 corrosion have been studied in several projects dealing with multiphase flow. Mechanistic models based on electrochemistry, reaction kinetics, and mass transfer effects have been developed, e.g. by Nesic et al. [6.28]. A semi-empirical model was presented by de Waard et al. [6.29]. This model and the corresponding experimental results are valid for cases without carbonate scales. Inhibition can be accounted for by inserting an inhibitor efficiency factor. A model mainly based on the same data as the one developed by de Waard et al. is included in the standard NORSOK M-506 [6.30], The application of the NORSOK model is based on a computer program. Common to these models is that they are valid for cases with a bulk phase of water. For mist flow and dewing conditions the calculation basis is inferior, but such conditions give low corrosion rates. 

NORSOK Standard M-506. CO2 corrosion rate calculation model. Oslo Norwegian Technology Standard Institution, 1998. 

The latter steels have been developed during the last few decades. (For compositions, properties and standard numbers, see Table 10.6.) A benefit of the ferritic-austenitic steels is their higher strength compared with the austenitic. Ferritic-austenitic 25-7-4 steel and austenitic 20-18-6 have both shown very good crevice corrosion properties in seawater, but also on these steels attacks may develop when the temperature is above a limit that depends on various conditions. Of these two steel types, the ferritic-austenitic steel may have somewhat lower corrosion resistance in welds than the austenitic 6 Mo steel. With first-class welds, pipes made of the latter material are considered safe to use up to 30-35°C in seawater. However, on flanges that are cast or produced by powder metallurgy, attacks have been found at a temperature as low as 10-15°C. For use in chlorinated seawater with a residual chlorine content of 1.5 ppm, the NORSOK standard [10.10] recommends a maximum temperature of 15°C for components with crevices and 30°C for... 

General recommendations for materials seleetion in die offshore seetor are given in die NORSOK standard [ 10.10]. 

NORSOK, Life Extension for Subsea Systems, NORSOK Standard U-009, Edition 1, March 2011. 

The aforementioned provision on accidental loads is accompanied by an official guideline recommending the use of inter alia several specified NORSOK standards for the purpose of designing the stmcture in such a way that the function requirement is met. 

NORSOK standard for risk analysis (Z-or3, see http //www.standard.no/imaker.exe id=244). 

The NORSOK forum submits proposals for reducing the cost and time of new field developments by 40-50% while maintaining Norways leading position with regard to HSE... 

The NPD adopted the position of the unions that there was a eonneetion between the shuttling praetiee and the Nome aeeident. Through this translation the accident was enrolled as an actor in the broader discussion concerning the NORSOK regime and its influence on safety. By contacting the involved parties in order to evaluate the problems, the NPD also used the accident as an occasion to maintain and reconfirm tripartite collaboration on HSE. 

The recommendations from the NORSOK committees may be summed up in the following two points ... 

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