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Mounded Bullet Design Load Cases as per EEMUA 190

Mounded Bullet Design Load Cases as per EEMUA 190 Introduction: This article is based on guidelines given in EEMUA 190. Design of mounded bullet is carried out as per PD 500 as suggested in EEMUA 190 (unless specified by the customer). Other codes like ASME also can be used for design calculations. Design of shell courses for internal and external…

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Bolting Torque Calculations

Bolting Torque Calculations Introduction: In order to achieve required leak-proof tightening of bolted flange joint assembly, appropriate bolt tightening method is used. Proper tightening of flange joint assembly creates compressive forces on gasket and pre-tensioning in bolts. As per bolt tightening methods or guidelines, cross tightening sequence is followed. Several cross tightening methods are available such as hand torque, slug/hand…

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Impact Test Requirements as per ASME Section VIII Division 1

Impact Test Requirements as per ASME Section VIII Division 1 Introduction Carbon steel and low alloy steels show a drastic change in room temperature ductility at sub-zero temperatures. This behavior is different for different types of materials. Therefore, impact testing at such service temperatures is mandatory to ensure the strength of vessel material. ASME provides some exemption for impact testing…

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Post Weld Heat Treatment (PWHT) Requirement as per ASME Section VIII Division 1

Post Weld Heat Treatment (PWHT) Requirement as per ASME Section VIII Division 1 Introduction: Post weld heat treatment (PWHT) is controlled process in which a material that has been welded is reheated to a temperature below its lower critical transformation temperature, and then is held at that temperature for the specified amount of time. The need of PWHT is mostly…

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Lifting Lug – WRC Calculation

Introduction: All directly welded parts to the pressure vessel like lifting lugs, support lug, trunnion etc. need to be checked for WRC 107/537. All related calculations are carried out in PV Elite once given proper inputs. In some cases, it is not possible to build such directly welded parts in PV Elite due to software constrain. For example, adding lifting…

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Flange Evaluation as per ASME B16.5 Pressure-Temperature Rating

Standard flanges for the nozzles is having strength identification by a dimensionless number which we called as a class. Class, followed by a dimensionless number, is the designated icon for pressure-temperature ratings: For Example:  Class   150   300   400   600   900   1500   2500 Pressure-temperature ratings are maximum allowable working pressures in bar units at the temperatures in degrees Celsius shown in…

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Agitator Design

Introduction: Mixing of fluids is necessary for many chemical processes. It may include mixing of liquid with liquid, gas with a liquid, or solids with liquid. Mixing is accomplished by the rotating action of an impeller in the continuous fluid. Type of fluid and its physical state, the degree of agitation and geometry of vessel makes an important role for…

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Pressure vessel hydrostatic test requirements and implications on design

For hydro test as per ASME code manufacturer of the equipment must follow ASME Boiler and Pressure Vessel Code Section VIII DIV.1 (Rules for Construction of Pressure Vessels), UG-99. We will discuss hydro test requirement in this discussion. Requirements as per ASME Boiler and Pressure Vessel Code Section VIII DIV.1 (Rules for Construction of Pressure Vessels), UG-99 - Before hydro test…