Rational Design of Pipe Racks Used for Oil Sands and Petrochemical Facilities

Bedair, Osama

doi:10.1061/(asce)sc.1943-5576.0000224

Cited by 23 publications

(13 citation statements)

References 19 publications

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“…In this vein, the seismic response of PRs has not been examined in unison with the supported equipment. Indeed, this is a common practice that is followed even by engineers in the industrial sector who overlook critical design aspects due to the lack of provisions of codes (particularly of EN) and in order to meet the time constraints (Bedair 2015). Therefore, it is essential the design process to account, if necessary, for the dynamic interaction between the multiply supported nonstructural components and supporting structure considering additional parameters apart from the relative weight ratio that is mostly prescribed in the codes.…”

Section: Nonstructural Componentmentioning

confidence: 99%

On the seismic fragility of pipe rack—piping systems considering soil–structure interaction

Sarno

Karagiannakis

2020

Bull Earthquake Eng

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Piping systems constitute the most vulnerable component in down-and mid-stream facilities posing immediate threat to human lives, communities financial robustness and environment. Pipe racks present several mechanical and geometrical idiosyncrasies compared to common buildings and the seismic response is governed by the pipework layout. Important design requirements e.g. dynamic interaction between pipelines and supporting structure are commonly overlooked during pipe racks design process and uncertainties relevant to modelling of soil or seismic input are not quantified. In the present work, after reviewing the technical literature and codes, a 3D RC rack was used as a testbed and analysed as coupled and decoupled with a non-seismic code conforming piping system accounting for soil-structure interaction. Incremental dynamic analysis was adopted as an assessment methodology for deriving fragility curves considering ground motions in near-and far-field conditions. It was deduced that the modelling (boundary conditions of pipes) was the most considerable uncertainty since it increased the probability of collapse limit state of structural members from 0 to 59%. It was also demonstrated that soil deformability as well as source conditions altered considerably the dispersion of intensity measure conditional on engineering demand parameter of structural and nonstructural members. The results may be another indication that code provisions should be more normative regarding industrial pipe racks.

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Section: Nonstructural Componentmentioning

confidence: 99%

On the seismic fragility of pipe rack—piping systems considering soil–structure interaction

Sarno

Karagiannakis

2020

Bull Earthquake Eng

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“…It is worth mentioning that the piping system includes nine (9) elbows, one T-joint and two nozzles; it is common in oil refinery industry, horizontal expansion loops of pipes to be formed in order to minimize the internal pressure and this is the reason that pipes run out of the main frame of the rack (Bedair 2015). Also, it is a common industry practice, the location of pipe supports e.g.…”

Section: Case-studymentioning

confidence: 99%

“…Also, the type and location of bracing is essential for the transportation, lifting and support of permanent and operating loads. As an example, vertical bracing could be used to support side overhang cantilevers that are necessary for pipelines that run out of the main pipe rack frame (Bedair 2015). In the present case-study, the petrochemical steel pipe rack is considered first as an Ordinary Concentrically Braced Frame (OCBF) with horizontal and vertical bracing (more info about this structural type can be found in Imanpour et al (2011) and is modelled on ABAQUS software.…”

Section: Modelling and Design Of The Pipe Rack-piping Systemmentioning

confidence: 99%

“…Although the evaluation of the aforementioned factors seems to be a mature issue, nowadays, for common building structures, the situation is not the same for the structures under consideration. At least to the Authors' knowledge, there are very few research efforts that undertake the seismic design of petrochemical steel pipe racks (Bedair 2015;Di Roseto et al 2017;Drake and Walter 2010) and even these publications not in a comprehensive manner since parameters e.g. behaviour factor selection or nonbuilding structure-nonstructural components interaction are not dealt with sufficiently.…”

Section: Introductionmentioning

confidence: 99%

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Petrochemical Steel Pipe Rack: Critical Assessment of Existing Design Code Provisions and a Case Study

Sarno

Karagiannakis

2019

Int J Steel Struct

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The investigation of the seismic integrity of petrochemical plant steel structures should be commensurable to their importance given the high necessity for human life safety and financial robustness. To date, it is demonstrated in the existing literature that still many grey areas of knowledge exist upon the appropriate application of code provisions on non-building structures design. Indeed, the selection of seismic design parameters such as system performance factors or important classes are still vague aspects, in contrast with those for common building structures, either because of the paucity of information of seismic codes or due to the structural peculiarities that characterise the industrial structures resulting in the difficulty of defining 'all-encompassing' design parameters. The present paper aims at highlighting those parameters considering also a case-study that pertains to a steel pipe rack. The pipe rack is designed and analysed in the linear and nonlinear regime, both statically and dynamically, according to the Italian and European codes. American code provisions are examined as well so as possible inconsistencies might be found. It is demonstrated that the common nonlinear static analysis (pushover analysis) cannot be used to assess the response of the rack and the behaviour factor selection from current standards could be unjustifiable. Also, common engineering demand parameters, e.g. interstorey drift ratio, need further assessment vis-à-vis the response of nonstructural components of which the current design method does not comply with modern methods.

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“…Reyes and Guzmán 10 conducted experiments of box sections composed of two welded C‐sections subject to axial loading. Bedair 11–19 highlighted behavior of box sections subject to uniform compression with applications to bridge and industrial facilities. Cost effective design strategies and engineering guidelines were presented to optimize the design and fabrication costs.…”

Section: Introductionmentioning

confidence: 99%

Local stability of partially restrained rectangular tubes subject to shear, compression, and bending

Bedair

2020

Civil Engineering Design

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This paper investigates local stability of tube sections subject to shear, compression, and bending. A closed form expression is proposed by idealizing the tube components as partially restrained against rotation and in-plane translation. The derived expression is validated for limiting conditions with existing design expressions that are available in engineering standards. It is shown that the buckling stress may differ by 38% due to the rotational and lateral restraints. The proposed expressions can be utilized by practitioners to compute buckling load for various applied stress ratios with reasonable accuracy.

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Rational Design of Pipe Racks Used for Oil Sands and Petrochemical Facilities

Cited by 23 publications

References 19 publications

On the seismic fragility of pipe rack—piping systems considering soil–structure interaction

On the seismic fragility of pipe rack—piping systems considering soil–structure interaction

Petrochemical Steel Pipe Rack: Critical Assessment of Existing Design Code Provisions and a Case Study

Local stability of partially restrained rectangular tubes subject to shear, compression, and bending

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