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.

Transfer Coefficients in Spray Cooling of Plastics Pipes [PE]


Plastic Pipes Conference Association # 1995 Edinburgh

Pittman, Farah

Heat transfer coefficients for splay cooling in the manufacture of blue, yellow and black PE-80 and PE100 MDPE pipes are determined by measuring pipe surface tempemhtres in the annealing zones between splay tanks, and then fitting a computer simulation of the cooling process by adjustment of heat wander coefficients. Data were collected fmm six exhusion lines producing pipes fmm 63 to 315mm diameter. T d e r coefficients were found not to depend simcantly on pipe diameter, or on the variations in spray arrangements hetween exhusion lines; however, a si@icant and consistent reduction in values was found for successive tanks along the cooling line. In the first (vacuum) tanks a value of about 1500 w/m2 K was fo\md; in the second 500 w/m2 K and in the third 250 Wlm K. There is no conclusive evidence that polymer material affects the values, though somewhat higher mmfer coefficients were deduced for black PE-100.

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

Related papers

1995 Edinburgh : Computer simulation of the Cooling Process in Plastic Pipe Manufacture

Author(s) : Pittman, Farah

Once a grade of polymer has been specified for pipe production, the properties of the finished pipe depend on the processing conditions. By properties we mean here those attributes that will influence the in-service performance, and these can be grouped under three headings: Pipe geometry. To meet specifications and...

1995 Edinburgh : Mechanical properties and residual stresses trough the wall thickness of polyethylene piping

Author(s) : Isaac, Eccott, Pittman, Farah

This study has sought to characterise the variations in mechanical properties and residual stresses that develop as a result of the differential cooling rates that occur through the thickness of commercially produced polyethylene pipes. The mechanical behaviour has been studied through measurement of tensile...

1995 Edinburgh : Microstructural Characterisation of Polyethylenes for Pipe Application

Author(s) : Isaac, Eccott, Perridge, Pittman

A detailed investigation has been carried out on the microstructure of various polyethylenes recently developed for applications in the pipe industry. Of particular interest have been the PElOO formulations, and samples of these have been studied both from commercial piping and from laboratory produced plaques....

1992 Eindhoven : The Cooling Phase of Large Pipe Manufacture

Author(s) : Pittman, Whitman, Gwynn, Beech

Comprehensive operating data from a large-scale pipe cooling lime are reported, including in-situ measurements of temperatures within the pipe wall. A finite element simulation of cooling, coupled with gravity induced flow, or slump, in the pipe wall is described. Computed temperatures within the wall are compared...

Members of the Association

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