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Month: January 2021

the most common welding defect

Uncategorized
What is welding defects? Welding defects may be define as a discontinuity or discontinuities that failed to meet the minimum acceptance per standard or specifications. Defects may occurred in excessive conditions, outside the acceptance limits which risks to compromise the stability or the functionality of the welded structure. They are also acceptable discontinuities, the same type of discontinuity of a lesser degree, might be considered harmless and acceptable. Weld defects happen for a host of reasons. Air may creep into the weldment to cause porosity. The wrong amount of heat can cause cracking. Bad welding technique can cause undercuts or incomplete penetrations of one kind or another. Various factors contribute to weld problems, but many lead back to the same place. In fact, mo...

wall thickness calculation as per ASME

mechanical engineer
Wall Thickness Calculation is a document that aims to ensure that the selected wall thickness value meets international standard code rules by attaching the calculation results in the form of a table. Code type used must be in accordance with the type of service passed by piping line. On this occasion, Dad Engineer chose ASME B31.3 as the basis of reference formula to calculate Wall Thickness on pipe. In addition to ASME B31.3, there is also another reference which is ASME B31.8 which is used for service pipeline. Here is the formula used in ASME B31.3 2010: t = thickness value according to design pressure P = internal design pressure value D = Outside Diameter (OD) pipe according to standard table S = Stress value material from table A-1 E = Quality factor of tables A-1A and...

Introduction to Flange type and size

mechanical engineer
Answering what is flange? Flange pipe is a component used to combine between two elements of pipe with valve or pipe with other equipment into one whole unit by using bolts as adhesive. So that later the two separate objects can become one part for a specific purpose. Usually these flanges are used to unite and become a single patent connection. So with this pipe flange the effort to connect 2 parts into one will become easier. Especially for high pressure gas pipes or for water distribution systems require long pipes. So it is this tool that has the responsibility to unify the passage. Flange type by Class Flange or other forging names (for self reinforcement types), can be several types when viewed from the class. Namely flange class 150#, 300#, 600#, 900#, 1500#, 2500# even up to...