Design Conditions and Criteria

2021 ◽  
pp. 17-30
Author(s):  
Charles Becht
Keyword(s):  
Wall Thickness ◽  
Pipe Wall ◽  
Potential Temperature ◽  
Pipe Wall Thickness ◽  
Potential Pressure ◽  
Design Pressure ◽  
Component Rating

Design conditions in ASME B31.3 are specifically intended for pressure design. The design pressure and temperature are the most severe coincident conditions, defined as the conditions that result in the greatest pipe wall thickness or highest required pressure class or other component rating. Design conditions are not intended to be a combination of the highest potential pressure and the highest potential temperature, unless such conditions occur at the same time.

Leak Testing

2021 ◽  
pp. 143-147
Author(s):  
Charles Becht
Keyword(s):  
Wall Thickness ◽  
Pipe Wall ◽  
Piping System ◽  
Pipe Wall Thickness ◽  
Pressure Testing ◽  
Leak Testing ◽  
Piping Systems ◽  
Design Pressure ◽  
Important Test

While the exercise of pressurizing a piping system and checking for leaks is sometimes called pressure testing, the Code refers to it as leak testing. The main purpose of the test is to demonstrate that the piping can confine fluid without leaking. When the piping is leak tested at pressures above the design pressure, the test also demonstrates that the piping is strong enough to withstand the pressure. For large bore piping where the pipe wall thickness is close to the minimum required by the Code, being strong enough to withstand the pressure is an important test. For small bore piping that typically has a significant amount of extra pipe wall thickness, being strong enough is not in question. Making sure that the piping is leak free is important for all piping systems.

Development of a mathematical model of the influence of wall thickness on the strain rate when profiling pipes by drawing

2020 ◽  
pp. 49-52
Author(s):  
R.A. Okulov ◽  
N.V. Semenova
Keyword(s):  
Mathematical Model ◽  
Strain Rate ◽  
Wall Thickness ◽  
Pipe Wall ◽  
Strain Intensity ◽  
Thickness Strain ◽  
Pipe Wall Thickness

The change in the intensity of the deformation of the pipe wall during profiling by drawing was studied. The dependence of the strain intensity on the wall thickness of the workpiece is obtained to predict the processing results in the production of shaped pipes with desired properties. Keywords drawing, profile pipe, wall thickness, strain rate. [email protected]

Simulation of Ductile Tearing in a Dissimilar Material Weld up to Pipe Wall Break-Through

2010 ◽  
Author(s):  
Philippe Gilles ◽  
Alexandre Brosse ◽  
Moi¨se Pignol
Keyword(s):  
Crack Initiation ◽  
Crack Growth ◽  
Wall Thickness ◽  
Surface Crack ◽  
Pipe Wall ◽  
Ductile Crack ◽  
Pipe Wall Thickness ◽  
Ductile Tearing ◽  
Ductile Crack Growth ◽  
Computational Analyses

This paper presents ductile initiation calculations and growth simulations of a surface crack up to pipe wall breakthrough. For validation purpose, one of the two BIMET configurations is selected. The EC program BIMET has been carried out to analyze the ductile tearing behavior of DMWs through experiments and computational analyses. In the mock-up, the initial defect is an external circumferential defect located close to the weld-ferritic interface, with a depth of one third of the wall thickness. During the test, the crack extended up to two third of the pipe wall thickness. The aim of the study is to simulate the crack initiation and growth, to compare the results with the experimental records and to continue the ductile crack growth up to pipe wall break-through.

scholarly journals Comparative Study of Continuous Wave and Pulse Wave Electromagnetic Acoustic Resonance for the Measurement of Pipe Wall Thickness

2018 ◽  
Vol 26 (2) ◽  
pp. 312-319 ◽  
Author(s):  
Hongjun SUN ◽  
Ryoichi URAYAMA ◽  
Fumio KOJIMA ◽  
Mitsuo HASHIMOTO ◽  
Tetsuya UCHIMOTO ◽  
...  
Keyword(s):  
Comparative Study ◽  
Wall Thickness ◽  
Pulse Wave ◽  
Continuous Wave ◽  
Pipe Wall ◽  
Acoustic Resonance ◽  
Pipe Wall Thickness

MEASURING OF ELECTROCONDUCTIVE PIPE WALL THICKNESS USING EDDY-CURRENT METHOD IN PRESENCE OF LARGE GAP BETWEEN PIPE AND TRANSDUCER

2014 ◽  
pp. 14-18 ◽  
Author(s):  
E.V. Yakimov ◽  
A.E. Goldstein ◽  
V.F. Bulgakov ◽  
Yu.V. Alkhimov ◽  
V.Yu. Belyankov
Keyword(s):  
Wall Thickness ◽  
Eddy Current ◽  
Pipe Wall ◽  
Current Method ◽  
Eddy Current Method ◽  
Pipe Wall Thickness

Influence of the Structural Performance of Steel Tubular Scaffold Based on Measured Imperfection

2012 ◽  
Vol 256-259 ◽  
pp. 754-757 ◽  
Author(s):  
Hong Gao ◽  
Wu Gao ◽  
Chun Xiao Li ◽  
Xiao Xia Huo
Keyword(s):  
Wall Thickness ◽  
Carrying Capacity ◽  
Random Sampling ◽  
Impact Analysis ◽  
Pipe Wall ◽  
Pipe Wall Thickness ◽  
Control Rod ◽  
Tubular Scaffold ◽  
The Impact ◽  
Modal Method

In order to study the impact of the measured defects on the structure and properties of steel tubular scaffold, the stochastic finite element theory is used to study the different effects of different defect structure.To accord to the random sampling method, Nine five projects under construction fasteners scaffolding works pipe is measured.In the the live 6m and 3m φ48 × 3.5 specifications 748 pipe wall thickness, diameter, initial bending raw data is random sampling tests. Article establish a structure commonly used rod defects random distribution of pipe wall thickness, diameter and initial bending deviation and the parametric statistical information,through the use of the probability statistical theory and methods,excluding abnormal data. The article explores and studies fasteners scaffolding structure in different fastener tightening torque (30N • m, 40N • m, 50N • m), ideal initial geometric imperfections 3L/1000, and the measured rod defects and defectof the structure carrying capacity and impact analysis, by means of analysis software, the use of the consistent defects modal method and random defects modal method. The results of the analysis show that the pole bending defects affect the carrying capacity of steel scaffolding structure defects . Measured defects affect the steel scaffolding structure, leading to serious security risks. It is necessary to strengthen the control rod defects. The results provide reliable information for the design and construction units.

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