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Donny

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1
Basic Theory of Piping Stress Analysis
Expires After: Does not Expire

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So, we are in the early stage of the EPC Gas Plant for a client. The piping designer has completed the piping layout of one piping from exit nozzle of heat exchanger connecting to the pressure vessel located at the other side of the Plant. The preliminary pipe support has been identified, sitting on the pipe rack, while remaining overhung until reaching the nozzle. It is now the job of piping stress engineer to make sure that the piping system has adequate and sufficient flexibility while the forces imposed to the nozzle will be kept minimal to meet the Allowable Load from the manufacturer.

It is also to check whether the piping materials commensurate with the intended service, temperatures, pressures, and anticipated loadings and most importantly that the loads imposed will not cause harm and nor causing damage to the nozzle equipment. The relationship between piping stress analysis with piping design group and the pipe support are highly interrelated and therefore very close. The piping layout can be iterated until a satisfactory balance between stresses and layout efficiency is achieved, the pipe support location has been properly identified and analyzed to satisfy all of stress requirement and the piping allowable loads at nozzle equipment are met. Once it’s done, then proper pipe supports for identified location are then designed based on the selection locations, types, and the applied loads.

This Course discusses the basic theory of piping stress analysis for piping system in Oil and Gas facilities such as Refinery Plant, Gas Plant, Petrochemical Plant, Geothermal Plant. Although we all aware that most of the stress analysis for critical lines will be done using computer program, but it is crucial to have a better understanding about the basic theory of piping stress analysis which will make the job much easier and proper knowledge when evaluating the output of the calculation as well as providing the solution to the problems we light have such as overstress or overload at the nozzle of equipment.

2
Pipe Properties Calculation
Expires After: Does not Expire

Several data about pipes, such as pipe weight, pipe area, and other pipe properties will be needed by piping engineer as well as piping stress engineer when performing his job to do stress analysis or to design pipe support as well as to calculate load on pipe support, which will be needed to inform Civil group during detail design.

In this course we will provide several types of calculations normally performed during the piping stress analysis activities. This will not only applicable for piping, which is based on ASME B31.3 (Process Piping) and B31.1 (Power Piping), but also for pipeline, which is ASME B31.4 (Pipeline Transportation Systems for Liquids and Slurries) and B31.8 (Gas Transmission and Distribution piping systems).

3
Standard Pipe Support
Expires After: Does not Expire

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Pipe support is one of the important and an integral part in the piping system which have the main job to control the weight effect of the piping system and make sure that the piping system will be properly supported for the entire its operation at any condition in order to avoid a mechanical failure of the metal due to excessive stress in pipe supporting elements. Pipe support must be placed in a location that allows it to be properly installed, such as not too close to the valves, avoid near the weld joint, and as much as possible near the structure to provide logical and convenient point of support, anchorage, guidance, limit stop, restraint, with adequate space available at such point for the use of a proper pipe support component.

It is also important to note here that the involvement of piping stress engineer at the early stage of the project, such as during FEED and early detail design is crucial by working works together with piping designer to locate and identify pipe support type and location for lines connected to compressors, gas turbine, and other critical lines and critical equipment.

Pipe Support can be categorized into two main groups, namely:

  1. Standard Pipe Support,
  2. Special Pipe Support.

Standard Pipe Support is basically the type of pipe support which has been standardized/grouped for specific used based on the pipe sizes, vertical and horizontal load, and been given the specific naming/identification which therefore can be used at several pipe support locations, without having to perform the stress and strength calculation. On the other hand, Special Pipe Support is the type of pipe support which need to be designed for specific loads and for specific pipe support location, which normally having the loads beyond the standard loads and also the location of pipe to be supported away from the existing structure/concrete.

In general, there are three types of loads normally occur at the point of support:

  1. Vertical Loads due to Pipe Weight and Insulation
  2. Forces acting from the lateral direction of the pipe.
  3. The force acting in the direction of the pipe or axial axis or also called the longitudinal direction.

In this course we will be learning about the type of standard pipe support normally used for Oil and Gas Application and will also be showing some of example for specific project. Before that, we will discuss about the codes and standards available for the pipe support, the terminology, the functions and the allowable span calculation.

 

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6
Wall Thickness Calculation
Expires After: Does not Expire

The Wall thickness calculation in this course will be presented into three lessons, which is basically based on the utilization of pipe as well as ASME Code, whether for process piping, ASME B31.3, Liquid pipeline, ASME B31.4, and Gas pipeline, ASME B31.8.

7
Initial Nozzle Movement
Expires After: Does not Expire

When calculating the piping stress analysis for piping system, in particular for pipes connected to nozzle of equipment, either static equipment or rotating equipment, one of the most important things that must be prepared is to calculate the amount of initial nozzle movement due to the temperature of the equipment. This is becoming more important if the piping system temperature analyzed using design temperature which is basically higher than equipment temperature. There are two methods that are generally carried out by Stress Engineers when performing stress analysis using CAESAR II program,  namely:

  • The pipe stress analysis will end at the Nozzle, assuming the Nozzle as an Anchor Point with displacement. For this purpose, a manual calculation will be performed to calculate the initial movement of the nozzle and then the result will be added into Anchor point at the nozzle.
  • To include the nozzle equipment as well as the fixed point of the equipment into pipe stress modelling. This basically includes the equipment into the piping stress analysis model at CAESAR II or AutoPIPE

In terms of practicality, then the first method will probably be easier to do. Except for small and simple equipment, maybe modelling equipment in a CAESAR II or AutoPIPE is an interesting choice. Normal Operating Temperature will be used to calculate the initial nozzle movement of the equipment. The following will show the way to calculate the initial movement for equipment.