Surface sensitivity study of non-gasketed flange joint

David Nash, Muhammad Abid

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

From analytical contact pressure studies of gasketed and non-gasketed flanged pipe joints, it is known that good contact maintained over consistently large areas occurs in a no-gasketed flange joint compared with a gasketed joint, where contact is only on the seal ring portion of the gasket. However, the presence of contact pressure and a good flange surface finish does not in itself eliminate the problem of leakage. Rather, it is the surface flatness in combination with contact pressure and surface finish that is necessary to generate effective contact at the inside diameter of the flange. This occurs providing there are no gaps due to deformation arising from the welding process to the mating pipe as flow is proportional to gap height. However, the question remains as how to ensure adequate surface flatness as non-gasketed flange surfaces are sensitive to damage, which may be present in the form of surface deformation, scratches and dents or bulges. A detailed experimental study is therefore carried out to measure the surface finish and surface flatness post manufacture and welding of such flanges. Results of actual flanges were compared with solid circular plates of the same dimension with inserted shims to provide gaps in order that flow rate/gap height ratio be studied. Manufacturing issues with respect to monitoring and controlling deformations are discussed and recommendations are suggested for flange redesign, appropriate welding approaches and manual handling of non-gasketed flanges.
LanguageEnglish
Pages205-212
Number of pages7
JournalProceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering
Volume218
Issue number4
DOIs
Publication statusPublished - 2004

Fingerprint

Flanges
Welding
Shims
Pipe joints
Seals
Pipe
Flow rate
Monitoring

Keywords

  • non-gasketed
  • leakage
  • flanged pipe joints
  • surface sensitivity
  • mechanical engineering
  • contact pressure studies

Cite this

@article{6cea7de1fbf849159d7d5e7a309c5d72,
title = "Surface sensitivity study of non-gasketed flange joint",
abstract = "From analytical contact pressure studies of gasketed and non-gasketed flanged pipe joints, it is known that good contact maintained over consistently large areas occurs in a no-gasketed flange joint compared with a gasketed joint, where contact is only on the seal ring portion of the gasket. However, the presence of contact pressure and a good flange surface finish does not in itself eliminate the problem of leakage. Rather, it is the surface flatness in combination with contact pressure and surface finish that is necessary to generate effective contact at the inside diameter of the flange. This occurs providing there are no gaps due to deformation arising from the welding process to the mating pipe as flow is proportional to gap height. However, the question remains as how to ensure adequate surface flatness as non-gasketed flange surfaces are sensitive to damage, which may be present in the form of surface deformation, scratches and dents or bulges. A detailed experimental study is therefore carried out to measure the surface finish and surface flatness post manufacture and welding of such flanges. Results of actual flanges were compared with solid circular plates of the same dimension with inserted shims to provide gaps in order that flow rate/gap height ratio be studied. Manufacturing issues with respect to monitoring and controlling deformations are discussed and recommendations are suggested for flange redesign, appropriate welding approaches and manual handling of non-gasketed flanges.",
keywords = "non-gasketed, leakage, flanged pipe joints, surface sensitivity, mechanical engineering, contact pressure studies",
author = "David Nash and Muhammad Abid",
year = "2004",
doi = "10.1243/0954408042467007",
language = "English",
volume = "218",
pages = "205--212",
journal = "Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering",
issn = "0954-4089",
number = "4",

}

TY - JOUR

T1 - Surface sensitivity study of non-gasketed flange joint

AU - Nash, David

AU - Abid, Muhammad

PY - 2004

Y1 - 2004

N2 - From analytical contact pressure studies of gasketed and non-gasketed flanged pipe joints, it is known that good contact maintained over consistently large areas occurs in a no-gasketed flange joint compared with a gasketed joint, where contact is only on the seal ring portion of the gasket. However, the presence of contact pressure and a good flange surface finish does not in itself eliminate the problem of leakage. Rather, it is the surface flatness in combination with contact pressure and surface finish that is necessary to generate effective contact at the inside diameter of the flange. This occurs providing there are no gaps due to deformation arising from the welding process to the mating pipe as flow is proportional to gap height. However, the question remains as how to ensure adequate surface flatness as non-gasketed flange surfaces are sensitive to damage, which may be present in the form of surface deformation, scratches and dents or bulges. A detailed experimental study is therefore carried out to measure the surface finish and surface flatness post manufacture and welding of such flanges. Results of actual flanges were compared with solid circular plates of the same dimension with inserted shims to provide gaps in order that flow rate/gap height ratio be studied. Manufacturing issues with respect to monitoring and controlling deformations are discussed and recommendations are suggested for flange redesign, appropriate welding approaches and manual handling of non-gasketed flanges.

AB - From analytical contact pressure studies of gasketed and non-gasketed flanged pipe joints, it is known that good contact maintained over consistently large areas occurs in a no-gasketed flange joint compared with a gasketed joint, where contact is only on the seal ring portion of the gasket. However, the presence of contact pressure and a good flange surface finish does not in itself eliminate the problem of leakage. Rather, it is the surface flatness in combination with contact pressure and surface finish that is necessary to generate effective contact at the inside diameter of the flange. This occurs providing there are no gaps due to deformation arising from the welding process to the mating pipe as flow is proportional to gap height. However, the question remains as how to ensure adequate surface flatness as non-gasketed flange surfaces are sensitive to damage, which may be present in the form of surface deformation, scratches and dents or bulges. A detailed experimental study is therefore carried out to measure the surface finish and surface flatness post manufacture and welding of such flanges. Results of actual flanges were compared with solid circular plates of the same dimension with inserted shims to provide gaps in order that flow rate/gap height ratio be studied. Manufacturing issues with respect to monitoring and controlling deformations are discussed and recommendations are suggested for flange redesign, appropriate welding approaches and manual handling of non-gasketed flanges.

KW - non-gasketed

KW - leakage

KW - flanged pipe joints

KW - surface sensitivity

KW - mechanical engineering

KW - contact pressure studies

UR - http://dx.doi.org/10.1243/0954408042467007

U2 - 10.1243/0954408042467007

DO - 10.1243/0954408042467007

M3 - Article

VL - 218

SP - 205

EP - 212

JO - Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering

T2 - Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering

JF - Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering

SN - 0954-4089

IS - 4

ER -