ROTT data

Recent advances have led to the development of the Room Temperature Tightness Test known as ROTT.l" This test closely resembles the actual operating cycle of the gasketed joint (i.e., loading and unloading). It generates parameters that are used to calculate the bolt load for a required maximum allowable leak rate. Gasket manufacturers publish ROTT data. 

The end user combines the chemical compatibility information and the ASTM F586 or ROTT data to design ajoint. Table 4.19 shows the ROTT data of fluoropolymer gaskets currently used in the industry. For a more complete understanding of ROTT and gaskets in general, see Refs. 12 and 13. 

Table 4.19. (Cont d.) ROTT Data for Fluoropolymer Gaskets...

There is reasonable similarity across the countries of the European Union, and these labels are collated into national compendia such as the Rotte Liste in Germany or the Data Sheet Compendium in the United Kingdom, to which the... 

Table 4.19. ROTT (Room Temperature Test) Data for Fluoropolymer Gaskets (Courtesy Flexitallic, ENPRO Garlock, UCAR, Frenzelit, Clipper, Durable, W.L. Gore, and Teadit Companies)...

Rotte et al. (R20), using a nickel wire circulated through ferri-ferrocyanide solution, found only approximate agreement with Eq. (30) experimental mass-transfer rates were mostly low compared with Eq. (30), and showed considerable scatter. Rao and Sharma (R4) accounted for turbulence in the hydrodynamic boundary layer over part of the cell length, obtaining good agreement between the predicted values and their own data, as well as those of Rotte et al. 

There is reasonable similarity across the countries of the European Union (EU), and these labels are collated into national compendia such as the Rotte Liste in Germany or the Data Sheet Compendium in the UK, to which the reader is referred. Consistency between countries is likely to increase now that drug licensing has been centralized at the European Medicines Evaluation Agency (EMEA). Many of the headings within European labeling correspond to those shown for Japan (Table 31.1, above), and the USA. 

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