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Mechanical Study

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Radiography Test 와 Joint Efficiency 의 관계 Radiography Test 와 Joint Efficiency의 관계 Joint Efficiency란? ASME Code Sec.VIII Div.1 의 UG-27 THICKNESS OF SHELLS UNDER INTERNAL PRESSURE 에 따라서 내압에 대한 두께를 계산할 수 있습니다. 이 때, Joint Efficiency 란 것이 고려되어 계산됩니다. E = Joint Efficiency P = Internal Design Pressure R = 고려되는 Shell course의 안쪽 반지름 S = Maximum allowable stress 값 (UG-23 및 UG-24의 Stress limitation 참조) t = Shell 의 최소 두께 t = PR / (SE-0.6P) or P = S..
Filter Package (Backwash Filter, Filtration Cycle) ◎ What is Filtration ? Process to separate solid, liquid or gas using perforated or porous membrane. ◎ Purpose of Filtration Removal of Water / Fluid Contaminants 1) Solids - Gas Separation 2) Solids - Liquids Separation 3) Liquids - Liquids Separation 4) Solids - Solids Separation Collection of Suspended Solids 1) Improve fluid quality by removing fluid contaminant 2) Collect contaminant before..
Gasket - Spiral Wound Gasket (Type, Characteristic) The sealing material is used for preventing leackage of fluids in various equipment, devices, etc., and it is required to have a perfect function under difficult conditions such as high temperature, high pressure, high speed, and corrosive fluid. It is necessary to select and use a suitable sealing material and quality to prevent loss of premature wear, stoppage, leackage, etc, and to perform no..
Pressure Vessel (Pressure & Temperature) PRESSURE A. Operating Pressure (OP) Pressure at the top of the vessel during normal operation. B. Maximum Operating Hightest operating pressure foreseen for all applicable cases (normal, turndown, startup shutdown) C. Desgin Pressure (DP) The pressure to be considered when determining the thickness of the pressure vessel. Maximum operating pressure plus a safety margin. Maximum Operating Pressur..
Stainless Steel Material Properties Stainless steels are alloyed with at least 11.5% chromium to become stainless. Chromium promotes the formation of passive iron/chromium oxide films on steel which, in turn, exhibit excellent corrosion resistance. ◆ Stainless Steels Categories - Martensitic Stainless Steels (Body-Centered Tetragonal or Cubic crystal structure) - Ferritic Stainless Steels (Body-Centered Cubic crystal structure) - ..
Nondestructive Examination (ASME Sec.VIII Div.1) Nondestructive examination (NDE) is a quality assurance tool used to check welds for flaws. This results in safer vessels and allows use of higher joint efficiencies; therefore, thinner shells. - As a method for determining the appropriateness of welding parts and steel materials for field use, there is a method of evaluating various mechanical properties of the welding parts and steel amterials..
ASME Sec.VIII Div.1 vs. ASME Sec.VIII Div.2 Difference between ASME Section VIII Div.1 and ASME Section VIII Div.2 For ASME Section VIII Div.1, it is sufficient to calculate the minimum required thickness using the allowable stress values at design pressure and design temperature. For ASME Section VIII Div.2, the stress applied to the vessel thickness at a given load should be calculated to show that it is not greater than the allowable s..
What is AIA, AI and PRE ? AIA (Authorized Inspection Agency) An Inspection company registered with ASME that performs inspection of vessel manufacture requiring the ASME Stamp. AI (Authorized Inspector) A certified inspector (AI) is employed by an Authorized Inspection Agency (AIA) as a person with a certificate of authority issued by the U.S. or Canada, a mandate from the National Board, and an approved mandate of "A" l..