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Smyk A.,Science and Research Affairs | Krecielewska E.,District Heating Research and Development Center | Abatorab K.,District Heating Research and Development Center
Euroheat and Power (English Edition) | Year: 2010

During determining the insulation thermal conductivity coefficient, the method of specifying the mean temperature of the pipe surface and the mean temperature of the casing is extremely important. The measurement must be performed with a minimum of 8 thermoelements located on the whole sample's measuring segment length, distributed spiral on perimeter of both surfaces. In order to increase of accuracy of measurement it is advisable to increase the number of thermoelements during investigation, for example the method conducted by OBRC. It is inadmissible to use temperature measurement in one sample section and point measurement. Divergence between the values of insulation thermal conductivity coefficients made of the same material system and with close mean apparent density, determined according to requirements of standard EN ISO 8497 and EN 253 may testify of for example: insulation heterogeneity or misalingnment of casing and line pipe. Up to now the researches performed in OBRC concerning thermal conductivity of pipe unit segment were done for insulation with casing jacket after previous removing them from pipe and mounting on specially prepared testing pipes, fulfilling the role of line pipes. Thanks to modernization of research stand, form this year OBRC performs the investigations concerning thermal conductivity coefficient of preinsulated elements according to standard EN 253:2009, so using fully prefabricated product without the necessity of removing insulation. Source


Smyk A.,District Heating Research and Development Center | Krecielewska E.,District Heating Research and Development Center | Lebek A.,District Heating Research and Development Center
Euroheat and Power (English Edition) | Year: 2010

Laboratory of District Heating Research and Development Center of Warsaw Municipal Heating Company (OBRC SPEC S.A.) was conducting regular tests to assess the quality of joint sleeves of preinsulated burnt district heating pipelines. Sandbox tests and water impermeability tests were one of the most important research carry out in the laboratory, as it verified the quality of joints. Investigations revealed that joints with electrically welded electrically welded casings were always subject to smaller or bigger deformation at the sleeve ends during tests and was visible at the casing's edge beyond the welding area. The research concerning joints performed in the laboratory were done to avoid the use of low quality joints to assemble in preinsulated networks. Source

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