VARIANTS FOR EVALUATING THE RIGIDITY OF FLAT RING FLANGES

This paper describes an analytical way of comparative evaluation of the stiffnesses developed in assemblies with flat ring flanges, of optional type, welded to the cylindrical body of a pressure vessel. Based on the theory of the compatibility of deformations (radial displacements and rotations), the mathematical expressions necessary for the evaluation of the unitary radial bending moments and the unitary shearing forces of connection are established. With their help, the values of the rotation angles of the rings can be calculated and compared with the admissible ones. The present analysis considers the quantitative effect of the deformed gasket and the stiffness of the curved/bent screws on the tightness of the system. The methodology is flexible by introducing some selection factors, so that the mentioned influences can be easily separated and compared

VARIANTS FOR EVALUATING THE RIGIDITY OF FLAT RING FLANGES

This paper describes an analytical way of comparative evaluation of the stiffnesses developed in assemblies with flat ring flanges, of optional type, welded to the cylindrical body of a pressure vessel. Based on the theory of the compatibility of deformations (radial displacements and rotations), the mathematical expressions necessary for the evaluation of the unitary radial bending moments and the unitary shearing forces of connection are established. With their help, the values of the rotation angles of the rings can be calculated and compared with the admissible ones. The present analysis considers the quantitative effect of the deformed gasket and the stiffness of the curved/bent screws on the tightness of the system. The methodology is flexible by introducing some selection factors, so that the mentioned influences can be easily separated and compared

The concept of sustainability applied to an industrial sludge deposit

The paper presents an environmental impact study in a real case: a landfill containing hazardous substances, held by an economic operator in an area near a city. The sludge storage was monitored taking into account three main impact factors: soil, groundwater and leachate. The actual environmental status of the storage area is assessed by calculating these impact factors before and during ten years of storage and the global pollution index

Influence of manufacturing temperature on the rheological behavior of some vegetable lubricating greases

Lubricant greases from renewable resources are considered as an alternative to those manufactured from mineral or synthetic oils, due to their close-loop supply chain. Low toxicity makes them prone for machinery in food industry. The goal of the present study was to find the optimum parameters for their manufacture from some vegetable oils and calcium stearate soap synthesized in situ. The effect of synthesis temperature (between 80-110 °C) and soap concentration (between 15-25% wt.) on the rheology and consistency of the products was studied. The optimum manufacture resulted to be 100 °C and soap concentration between 20-25% wt. The conclusions of these study can serve as a basis for improving the said greases through additivation