The large-scale contained use of biological agents / Advisory Committee on Dangerous Pathogens.
- Great Britain. Advisory Committee on Dangerous Pathogens
- Date:
- 1998
Licence: Open Government Licence
Credit: The large-scale contained use of biological agents / Advisory Committee on Dangerous Pathogens. Source: Wellcome Collection.
27/68 page 19
![op omfeitallalteliateie) io les) /10) ‘eh ef she) /éli[ei tel joy re] [ei :0l 1/6) e; ‘0: ‘et Vex /s) (e\ ;e; <0) 0) 1@) et *) 16) \ ©: (4 (@. 0) ©) fe: ‘8; 18) (0 16 'e: 8; 6 <e) (ei je. 1@, © (6 0: '8 88 Storage conditions for elastomers are also important to ensure best performance and need to take into account: Condition Storage requirement Temperature below 25 °C Humidity dry environment Light avoid direct sunlight or artifical light with a high violet content Oxygen/ozone ozone is aggressive to rubber and ages the material Oil/greases avoid contact during storage 90 O-rings can be made in various sections or profiles. Profiled O-rings are generally easier to fit than round rings. They are not necessarily satisfactory at low pressures and care must be taken in installations of this type when designing the dimensions of the seal groove. At higher pressures, some deformation of the O-ring takes place and a good seal can be obtained. With shaped O-rings which involve a flat part in the cross-section, care must be taken to ensure that a smooth face, in line with the pipe inner wall, is obtained in order to avoid a crevice which may harbour contamination. There is little evidence to suggest that in a static seal, two O-rings are better than one. The disadvantages are that the coupling is more difficult to assemble, it is difficult to detect failure of one of the seals as the seals cannot be tested independently and the space between them may give rise to contamination. The application of a steam seal between two O-rings has been used but this should generally be regarded as an unnecessary complication. SONG 6 BOA Sonu 6 ole be Oo OP OMOnCh Os (COD SOG CROONER ONC) (C's Om CE CNC eCIC wae CP UE ia Dee We Te da](https://iiif.wellcomecollection.org/image/b32230163_0027.jp2/full/800%2C/0/default.jpg)
