Development of an adhesive patch for polyethylene gas pipe Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/s4655k118

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Polyethylene has been used extensively for natural gas transport since the mid-1970's. The pipeline system is sound and well-functioning, but there are some aspects of the system that could be improved. One of these is the repair method of leaking pipes. Presently if a natural gas pipe begins to leak, the damaged pipe is completely excavated. The pipeline around the damaged area is clamped to seal the pipe and stop the gas flow. The bad piece of pipe is cut out, and a new piece is welded in place. Often, with the passage of time, these welds leak. This is not dangerous but it is costly. The current research focuses on the viability of using a polyethylene patch and a commercial adhesive to seal a leak in the natural gas pipeline. The patch would be applied to the pipe through a keyhole excavation (18" diameter) with a tool designed and manufactured by Timberline Tool. This tool offers an advantage because repairmen will be able to operate the tool from the ground level through a single keyhole excavation, and possibly without stopping the gas flow in the pipe depending on the leak size. Four commercial, acrylic-based, structural adhesives were analyzed for bonding the patch to the natural gas pipe. Three of the adhesives are manufactured by 3M Worldwide, DP-8005, DP-8010, and DP-8OIONS. The fourth is manufactured by Henkel Loctite, Loctite 3030. The cure kinetics of the adhesives were studied with differential scanning calorimetry (DSC) experiments. The material and mechanical properties of three types of polyethylene substrates (HDPE, pipe MDPE, and pressed MDPE) were studied with tensile testing, contact angle analysis, DSC experiments, atomic force microscopy, and scanning electron microscopy. Previous research of determined the bonded patch must be able to withstand up to 500 psi of shear force with an internal pipe pressure of 100 psi (normal pressure in the pipeline is 65 psi). Overlap shear tests were used to analyze the shear strength of the bond between each adhesive and the different polyethylene substrates. The shear tests were used to determine the optimal cure conditions of the adhesives. One adhesive, DP-8010 from 3M, was proven to be appropriate for bonding a polyethylene natural gas pipe. When this adhesive is cured under optimal conditions, and the surface of the polyethylene substrate is prepared properly, consistent shear strengths between 800 and 1400 psi can be attained.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Non-Academic Affiliation
Subject
Rights Statement
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome, 24-bit Color) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2011-08-18T21:54:41Z (GMT) No. of bitstreams: 1 CarboneCherylB2005.pdf: 10894102 bytes, checksum: 10ad5412dcb754c7244fe015a2f42216 (MD5)
  • description.provenance : Made available in DSpace on 2011-08-19T19:51:50Z (GMT). No. of bitstreams: 1 CarboneCherylB2005.pdf: 10894102 bytes, checksum: 10ad5412dcb754c7244fe015a2f42216 (MD5) Previous issue date: 2004-12-07
  • description.provenance : Submitted by Eric Vanderwall (ewscanner@gmail.com) on 2011-08-18T19:38:54Z No. of bitstreams: 1 CarboneCherylB2005.pdf: 10894102 bytes, checksum: 10ad5412dcb754c7244fe015a2f42216 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2011-08-19T19:51:50Z (GMT) No. of bitstreams: 1 CarboneCherylB2005.pdf: 10894102 bytes, checksum: 10ad5412dcb754c7244fe015a2f42216 (MD5)

Relationships

In Administrative Set:
Last modified: 08/08/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items