Thermal Shock Resistance

Thermal Shock Resistance

Any sudden temperature change on either glass or jacket side can result in damage to the Glass Lining and should be avoided. Most damaging thermal shocks are caused by splashing of cold products on to a hot glass surface. This causes formations of fine surface cracks which lead to Glass Lining failure. Most thermal shock damage results in flaking of the lining in relatively small but thick pieces of glass with a characteristic shape.
Guideline for maximum allowable temperature differences are given in adjoining figure. The left half of the chart gives maximum & minimum temperature of fluids which are introduced in the jacket for various temperature of fluids which are introduced in the jacket for various temperature of products in the reactor. e.g. if the temp. of product & the glass wall is 140°c, the temp. of fluid introduced in jacket should be between -15°c & 255°c.
The right half of the figure gives maximum & minimum temp. of products which are changed in the reactor for various temperature of glass and heating / cooling fluid in the jacket. e.g. if the temp. of jacket fluid & the glass wall is 180°c, the temp. of product charged in reactor should be between 50°c & 255°c.
However, for safe use of the equipment, 80% of figures given in the table should be used as a guideline.

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