Cleaning glass-lined vessels

In another case, acidic water was used to clean the inside of the water Jacket that surrounded a glass-lined vessel. Some hydrogen diffused through the wall of the vessel and developed sufficient pressure to crack the glass lining. 

In addition to the other advantages noted, glass-lined vessels are easy to clean so that down-time between batches is greatly reduced and interbatch contamination is virtually eliminated. 

Consider foul-resistant materials (e.g.. Teflon) on heat exchange surfaces and vessels requiring frequent cleaning. Consider glass- or polymer-lined vessels when frequent cleaning is required. 

Table IV shows X-ray data (55) on the homogeneity of Pd-Ag films prepared by simultaneous evaporation from separate sources, either in conventional vacuum or in UHV, with the substrate maintained at 0°C. The second group of films was prepared using a stainless steel system incorporating a large (100 1/sec) getter-ion pump, sorption trap, etc., but deposited inside a glass vessel. By the tests of homogeneity adopted, alloy films evaporated in conventional vacuum were not satisfactory, i.e., the lattice constants were generally outside the limits of the experimental error, 0.004 A, and the X-ray line profiles were not always symmetrical. In contrast, alloy films evaporated in UHV were satisfactorily homogeneous. Further, electron micrographs showed that these latter films were reasonably unsintered and thus, this method provides clean Pd-Ag alloy films with the required characteristics for surface studies.

An 8-1. stainless steel bucket was used to scoop water from the surface. Bar weights were welded on one side so that the bucket would dip into the water as soon as it touched the surface. The bucket was tied to a previously extracted polypropylene rope and swung from a boom on the windward side of the vessel from as far forward a position as could be safely managed. Upon retrieval of the bucket the water was pomred directly into a 1- or 3-gal. glass bottle for immediate extraction by carbon tetrachloride. A carbon tetrachloride rinse of the bucket was part of the extract which was placed in a clean 4-oz bottle with an aluminum-lined cap. 

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