IDENTIFICATION OF THE PE RESINS OF THE DISTRIBUTION NETWORKS BY MEANS OF THE DSC-SIS TECHNIQUE APPLIED ON MICRO-SAMPLING [PE]

# 2012 Barcelona

(Polyethylene, SIS technique,Micro-sampling)
The  use  of  polyethylene(PE) since  the  early  seventies  on  the  GDF  SUEZ’  distribution networks has lead to the coexistence of a very wide variety of PE resinswith significant differences  in  their  long  term  performances. Nevertheless,  in  order  tojustify  a possible delayed or postponed selective replacement of the very first pipes laidone must be able to locate them easily in the field.As such a task is not possible by simply looking at the digital mapping system of the networks whereon are mentioned only limited operational information,  GDF  SUEZ’  R.&  I.  Division  has  proposed an  innovative  identification method consistingina physicochemical characterization of the “lost”  material scrapped off from an old pipe on which an intervention is carried out. The characterization is made in  the  laboratory  on  very  small  quantities  of  material  (ca.  30mg)  by  means  of  the Stepwise  Isothermal  Segregation  (SIS) Technique  on  the  basis  of  a  specific  protocol developed  and  adapted  to  cover  the  widestvariety  of  the  PEs  encountered.  The “fingerprints”  of  the  scraps  are  comparedto  those  integrated  in  a  database  currently established  by   GDF   SUEZ’   R.   &   I.   Division. The   data   presented   in   this  paper demonstrate the feasibility of the overall procedure from the field to the laboratory.This  method -whichcan  beintegrated easily in  the  working/intervention  plans  of  the operators-allows one to identify and in turn to locate precisely andselectively the oldest PEs while avoiding both large excavations and cost-effective pipe extractions.

Please note that the whole article content is available on PPCA website onlySource : 2012 Barcelona


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