Our site uses cookies necessary for its proper functioning. To improve your experience, other cookies may be used: you can choose to disable them. This can be changed at any time via the Cookies link at the bottom of the page.


A Photoelastic Study of Strains in PVC Pipe Bells Encountered During a Variety of Assembly

 

Joining

Plastic Pipes Conference Association # 2006 Washington DC

Shumard, Fisher, Rahman

Previous examinations of stresses in gasketed bell- and-spigot PVC pipe joints in North America have been limited to theoretical analyses and finite element evaluations, with the results relying on basic assumptions and observations. The objective of this study is to provide an accurate picture of the relative magnitude and locations of strains in the pipe joint in order to develop a better understanding of the affects of different installation variables. This picture is developed through the application of birefringent, photoelastic coating to pipe bells and spigots. The coating allows the actual strains to be “seen” as the observed fringe patterns change with applied stresses. Photoelastic strain evaluation has been used successfully by engineers as a strain measurement technique for many years. This study examines the strains imposed on a PVC bell-and-spigot joint with and without internal pressure. Several installation variables are examined : assembly with proper insertion and alignment, improper assembly by over- insertion, assembly with an axial offset, and a pipe bell with a ring deflection. The results are presented in two ways. The first is visually to provide the reader with a true picture of the strains in a bell-and-spigot joint. The second is with calibrated stress calculations to provide an idea of the magnitude of stresses in the properly and improperly assembled joints. Field scenarios that result in an improper joint are discussed, correct installation procedures are reviewed, and construction aids that help make a proper joint more quickly are presented.

Please note that the whole article content is available on PPCA website only :

Related papers

2006 Washington DC : Containing Thrust Forces in Municipal Pipelines

Author(s) : Rahman, Rahman

Bell-and-spigot gasket-joint thermoplastic pipes such as Polyvinyl Chloride (PVC) are widely used in pressure applications for potable water distribution and transmission, and sewer force mains. The thrust forces which result at joints due to changes in the direction of flow or changes in the diameter size of a...

2006 Washington DC : PVC Pipe and Fitting Recycling in Action

Author(s) : Creelman, Fisher, Franzen

Two recycling case studies are presented. The first is the program at Royal Pipe Systems’ plant in Abbotsford, BC. Royal Pipe Systems works with the City of Abbotsford and Marv’s Excavating to collect post-industrial vinyl and reconverts it back into PVC pipe. The second is the program at Specified Fittings’ facility...

2006 Washington DC : PVC Pipe Jointing The Rieber System in North America

Author(s) : Rahman, Bird

The jointing of municipal Polyvinyl Chloride (PVC) pipelines in North America and in many countries around the world is achieved by means of a rubber sealing ring seated in the pipe bell to effectively prevent leakage between two adjoining pieces of pipe after the spigot (male end) is inserted into the bell (female...

2004 Milan : Developments in North American PVC Piping Products for Trenchless Applications

Author(s) : Rahman

This paper is a state-of-the-art review of a rapidly expanding market for the municipal Polyvinyl Chloride (PVC) piping industry in the United States and Canada : Trenchless Technology. The reality of municipal underground piping construction and rehabilitation in North America has evolved into a combination of both...

2004 Milan : Large diameter PVC pressure pipe for water and sewer applications in north America

Author(s) : Shah Rahman

The introduction of polyvinyl chloride (PVC) piping standards four decades ago on the North American continent has provided utilities and municipalities a solution to overcoming common problems inherent in traditional piping materials such as corrosion, pipe cracking, poor joint performance, and cost and difficulty of...

Members of the Association

BOREALISBOROUGEFormosa Plastics CorporationHanwha TotalEnergiesINEOS O&PIRPCKorea Petrochemical IND. Co., LTD (KPIC)LyondellBasellORLEN UnipetrolPetroChina Dushanzi Petrochemical CompanyPRIME POLYMERSABICSCG Chemicals & Thai PolyethyleneSinopecTASNEE