This study was a final thesis, for the bachelor program in civil engineering at the University of Uppsala, which was made on behalf of Riksbyggen in Uppsala. A comparative study of two stain renovation methods; tradition pipe replacement and relining was done with an environmental perspective. A simplified life cycle assessment (LCA) was done according to the International Organization of Standardization (ISO) with the LCA tool Eco-indicator 99, in order to be estimate the impact on the environment. LCA is a method that follows a product or a system “from the cradle to the grave”, which means that all the environmental impact over a lifetime is considered. The work was executed by using a stairway with nine apartments in a house called “Uppsala Hus 9” as a reference object, which was provided by Riksbyggen. The house was a typical house from the so-called “Miljonprogram” and was restored with traditionally pipe replacem ent four years earlier. Interviews were done with the companies VBE Byggproduktion AB and Novada that works with traditionally pipe replacement and relining, in order to receive information about material consumption, equipment, transports etcetera for both methods. Where some information was impossible to obtain, assumptions were made. The processes considered within the study were extraction and production of materials, energy use of machines, transports, recycling and waste. The environmental categories that the study estimated were taken from Eco-indicator 99 and the categories were “human health”, “ecosystem quality” and “resources”. The conclusion of the study was that the traditionally pipe replacement had a greater impact on the environment than the relining. This was mainly due to the fact that the production of material with the traditionally pipe replacement was about 950 times larger than with the relining. The transport with the traditionally pipe replacement was about three times bigger than the transport with relining. The result of the v recycling was larger with the traditionally pipe replacement than with the relining which had none recycling at all. The energy use of machines was slightly bigger with relining than with traditionally pipe replacement. Some of the data was unreliable, which required us to make some assumptions. This resulted in some of the values being too high or too low. An example could have been that the use of machines for both of the methods was too high. Meanwhile, it should not affect the result too much, due to the fact that the use of machines for both methods almost cancelled each other out.

This report is focusing upon relining from a client’s point of view. Potential buyers are given a presentation of the different methods available today together with a general briefing describing the process. An important part of this report are the interviews that took place with already established customers. Property owners, managers, pipe cleaners, and project managers whom all been in contact with relining have answered the questions given along with their own thoughts and have also given recommendations of other persons to talk to. Information has also been given the report through literature studies, fieldtrips, and meetings with some relining companies. The results presented in this report shows the relining industry to have satisfied customers, companies being very service minded, and that relining is a method worth considering if you´re in the need of taking care of old pipes. Relining your pipes is shown to be a very good environmental choice even though choosing a method containing epoxy with Bisphenol A. As a conclusion this report describes how relining can benefit to great savings, is an environmental good choice, and many times a quick and easy alternative to a traditional change of pipes. Overall there are three cases where relining is a good choice. 1. If there is an acute leakage on the pipes that can’t be solved quickly in any other way. 2. If the apartment already has a recently renovated bathroom and the floor drain and sealing layer is in good shape. 3. In places where it would be very expensive or almost impossible to change pipes or if the building contains businesses vulnerable to disturbance.

No description available.

Under den stora byggboomen på 1960- och 1970-talet byggdes det åtskilliga lägenheter i Sverige. Detta var ett riksdagsbeslut och syftade till att lösa den tidens akuta bostadsbrist. Projektet kom att kallas för miljonprogrammet och att innebar att en miljon lägenheter skulle byggas under en tio års period; under åren 1965-1975 byggdes 880 000 lägenheter. Många av dessa lägenheter står idag inför ett omfattande renoveringsbehov.   Den problematik som finns då en fastighetsägare ställs inför ett eventuellt stambyte kan vara svår att förstå då det innebär att många och svåra beslut måste fattas både innan och under byggskedet. Styrelsen i en bostadsrättförening besitter inte alltid den kunskap som krävs utan de blir oftast tvungna att ta hjälp av konsulter och projektledare som är med och driver igenom den långa processen.   Den traditionella stamrenoveringsmetoden innebär att gamla stammar och våtrum rivs ut och ett nytt badrum och nya ledningar installeras. Denna metod innebär olägenheter för de boende och i vissa fall är det kanske inte möjligt att bo kvar. Därför kan det vara lockande att satsa på andra metoder som inte tar så lång tid att genomföra. Nackdelarna med detta är att fastighetsägaren måste vara medveten om vilka risker det kan medföra. Förståelsen för att ett väl genomarbetat beslutsunderlag behövs innan beslut fattas är mycket viktig.    På senare tid har en ny metod tagits fram som innebär att man gjuter nya ledningar av plast inuti de gamla avloppsstammarna, så kallad relining. Detta betyder att stammarna kan sitta kvar i befintligt läge och rivningsarbetena minimeras därmed. Produktionstiden i varje lägenhet blir även betydligt kortare. Det som är viktigt att tänka på är dock att tätskikt och vattenledningar byts inte ut. Om våtrummen inte är renoverade sedan tidigare innebär det att den tekniska livslängden för övriga installationer och material med all säkerhet har passerats eller kommer att passeras inom ett antal år.   Under 2000-talet har det framkommit ytterligare en metod som har kommit att bli ett alternativ till det traditionella stambytet: den så kallade rum-i-rum-metoden. Med denna lösning behöver badrummen inte rivas ur, ett nytt rum byggs istället inuti det gamla och en luftspalt lämnas mellan de befintliga ytorna och de nya. Den eventuella fukt som finns har på så vis möjlighet att torka ur. Problematiken är dock att badrummen blir mindre och att det än så länge är en ganska obeprövad metod.   Vi anser att det är otroligt viktigt att man tillför projektet rätt sorts kunskap och erfarenhet, oftast i form av konsulter då dessa besitter specialkunskaper inom sitt område. Det är att rekommendera att även lägga tid och resurser på att utreda de olika systemens status i en byggnad för att kunna få en helhetsbild och fatta rätt och väl underbyggda beslut. Under projekteringen, upphandlingen och produktionsskedet bör föreningen ta hjälp för att vara säker på att de får rätt kvalitet, tekniska lösningar och ekonomi i projektet. Det underlag som framkommer efter utredningen ska ligga till grund för val av metod och ska noga övervägas. Vilken av de olika metoderna som bör väljas beror på förutsättningarna i byggnaden, men oftast är de ”traditionella” metoderna att föredra. Olika metoder kan också kombineras för att uppnå ett optimalt reslutat.

Degradation of steel pipes in district heating systems is often a result of corrosion processes. To maintain the power in the systems the pipes gets replaced when they have been worn-out, resulting in high cost and long service time due to excavation. A more affordable and time- effective method is known to be relining which implies renovation and facing of the already existing pipes. This thesis covers an initial review of the applicability of a polyamide curing solvent-free epoxy based relining for lifetime extension of corroded pipes in Stockholm Exergi's pipeline network. The research study is comprised of a literature search focusing on the permeability properties of epoxy coatings, an experimental part where the actual coating was tested for defined parameters similar to the prevailing ones in the system of Stockholm Exergi and finally an evaluation of the usability of the coating. Critical parameters such as the adhesion between the coating and the steel substrate, the sorption of water within the coating and the emit of Bisphenol A were carefully investigated during the analysis. Analysis methods such as pull of test, TGA, DSC and GC-MS were utilized in order to investigate the critical parameters. The adhesion between the coating and the substrate was found to be inadequate for the purpose, the TGA and DSC analysis showed a time-dependent increasing water sorption when exposure to 120 °C. At a higher temperature of 190 °C the sorption decreased. It was concluded that the coating cured at higher exposure temperatures which implied higher degree of conversion and thus a more brittle epoxy matrix. Additionally, the hydrophobicity decreased during 28 days of exposure, at both 120 °C and 190 °C, which can be supposed to affect the flow in the pipeline system during service. It can be stated that a spray coating consisting a polyamide curing solvent-free epoxy will not answer to a total solution for a lifetime extension for the pipes in Stockholm Exergi's pipeline network. An extended investigation regarding the exterior isolation of the pipes is suggested in order to circumvent the most critical breakdowns due to corrosion.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / A incorporação do diacetato de clorexidina em resinas macias para reembasamento de próteses pode se tornar uma boa alternativa na terapia com antimicrobianos usados para candidíase oral, uma vez que é independente da cooperação do paciente. Este trabalho teve como objetivo analisar a hipótese que a incorporação de diacetato de clorexidina em resinas macias não alteraria as suas propriedades físico-químicas. Foram analisadas duas resinas macias, uma à base de polimetilmetacrilato (PMMA) e outra à base de polietilmetacrilato (PEMA), com a incorporação de 0,5%, 1,0% e 2,0% de diacetato de clorexidina, além do grupo controle sem diacetato de clorexidina. Os espécimes foram armazenadas em água destilada a 37 durante 2hrs, 48 hrs, 7, 14, 21 e 28 dias e analisados quanto a cristalinidade do polímero através da difração de Raios X, a dureza mensurada com durômetro na escala shore A, o grau de conversão dos monômeros pela Espectroscopia de Infravermelho Transformada de Fourier (FTIR), a lixiviação de monômeros residuais e a liberação da clorexidina por Cromatografia Líquida de Alta Performace (HPLC). Os resultados mostraram que quanto à cristalinidade dos polímeros nas resinas macias à base de PMMA e de PEMA não alteraram após a incorporação de clorexidina, o que está relacionado à dureza Shore A, que aumentou ao longo do tempo, mas sem alteração significativa para nenhuma das concentrações de diacetato de clorexidina testadas. Já quanto ao grau de conversão, após a incorporação de clorexidina, a resina macia à base de PMMA não apresentou diferença estatisticamente significativa (&#1088;>0,05), porém a resina macia à base de PEMA apresentou diminuição significativa do grau de conversão (p<0,05), o que refletiu no aumento significativo da lixiviação de monômeros residuais nas concentrações 0,5% e 1,0% de clorexidina (p<0,05), principalmente nas primeiras 48 horas nessa resina. A resina macia à base de PMMA não apresentou alterações do padrão de lixiviação desses monômeros (&#1088;>0,05) e para ambas as resinas a cinética de liberação de clorexidina foi relacionada à lixiviação de monômeros residuais, que para a resina macia à base de PEMA foi maior significativamente nas primeiras 48 horas (p<0,05) e para a resina macia à base de PMMA não teve alteração estatisticamente significativa (&#1088;>0,05) se mantendo até o último dia de análise. Desse modo, conclui-se que a incorporação do diacetato de clorexidina não afetou a cristalinidade dos polímeros, inalterando a dureza nas duas resinas, porém o grau de conversão sofreu diminuição após a incorporação de diacetato de clorexidina na resina macia à base de PEMA, o que levou ao aumento da lixiviação de monômeros residuais e curta liberação de clorexidina; enquanto que a resina macia à base de PMMA, devido a não alteração significativa do seu grau de conversão, ocorreu menor lixiviação de monômeros residuais e liberação prolongada de clorexidina. / Chlorhexidine incorporation in soft denture liners can become a good antimicrobial treatment alternative for oral candidiasis, since it is independent of patient compliance. Considering this, the present study evaluate the hypothesis that chlorhexidine diacetate (CDA) incorporation in soft denture liners would not change their physical-chemical properties. For this, two soft resins were tested, one based on poly methylmethacrylate (PMMA) and the other based on poly ethylmethacrylate (PEMA), which received 0.5%, 1.0% and 2.0% of CDA incorporation, in addition to a control group without CDA. Specimens were stored in distilled water at 37 C during 2 hrs, 48 hrs, 7, 14, 21 and 28 days, then analyzed for polymer crystallinity through X-Ray diffraction, Shore A hardness measured with a durometer, degree of monomers conversion by Fourier transform infrared spectroscopy (FTIR), the leaching of residual monomers and release of CDA by high performance liquid chromatography (HPLC). Results showed that polymer crystallinity of PEMA and PMMA were not changed after CDA incorporation, this results is related to Shore A hardness, which increased over time, but not for any CDA concentrations tested. Considering the degree of monomers conversion, PMMA based resin did not present significant statistic difference (&#1088;>0.05), however the PEMA based resin had a significantly decrease on its degree of conversion (p<0.05), which was reflected in a significant increase of residual monomers leaching from PEMA based resin with 0.5% and 1.0% CDA incorporation (p<0.05), mainly in the firsts 48 hours. PMMA based resin had no alteration on its monomers leaching (&#1088;>0.05) and for both resins their CDA release kinetics was related to the monomers leaching, which for PEMA based resin was significantly greater in the first 48 hours (p<0.05) and for PMMA based resin was more sustained up to the last day of analysis. Thus, it is concluded that CDA incorporation do not affect polymers crystallinity and do not change their hardness, but the monomers conversion degree decrease for PEMA based resin, leading to an increase of residual monomers leaching and shorter CDA release, while for PMMA based resin, because of no change on their monomers conversion degree, there was less residual monomers leaching and prolonged CDA release.

Made available in DSpace on 2014-12-17T15:30:52Z (GMT). No. of bitstreams: 1 LuanaMMA.pdf: 2018250 bytes, checksum: 40d3a2d59df5edbadcdae3ffaf599eb2 (MD5) Previous issue date: 2009-02-03 / The non-adaptation of the removable partial prosthesis (RPP) base to fibromucosal tissue is caused by resorption of residual ridges (RRR). The onset of bone resorption, which occurs after tooth extraction and continues throughout life, is accelerated by local or systemic factors. Aim: Assess the degree of non-adaptation of removable partial prosthesis saddles and the factors that influence it. Methodology: A sectional study was conducted with 81 patients using RPP who had their prostheses installed between 2003 and 2007 (1 to 5 years of use) at the Faculty of Dentistry of the Universidade Federal do Rio Grande do Norte (UFRN). After anamnese and clinical examination, a cast was made with polyether-based material, using the base of the prosthesis to make the impression. The base of the saddle was loaded with the casting material and positioned in the mouth, applying pressure on the supports. After polymerization, the material was removed from the saddle and measurements were taken at 3 different points using a pachymeter. Results: The non-adaptation of the saddle increased significantly with years of use (p = 0.005). The tooth-tissue supported prostheses obtained higher mean non-adaptation values than those of tooth supported prostheses (p < 0.001). Flaccid mucosa showed the worst non-adaptation results, which were statistically different from resilient mucosa (p < 0.001). The greater the extension of the saddle, the greater the non-adaptation (p < 0.001). The natural tooth antagonistic arch yielded better results than did RPP and total prosthesis (p < 0.001). Saddle non-adaptation at the free end was less near the pillar tooth and greater in the more posterior region (p < 0.001). When adaptation of the supports to the niches was poor, greater saddle non-adaptation occurred than when it was good or fair (p < 0.001). Saddles located in the posterior region of the arch had greater non-adaptation than those in the anterior region (p = 0.023). Conclusion: The mean non-adaptation of the saddle to the residual ridges was 0.27 mm. It can be concluded that, even with the use of RPP, bone height reduction was slight within the 1-5-year period of use. The following are factors that influence adaptation of the RPP saddle base: years of use, age, force transmission path to the alveolar bone, location of the toothless area, antagonistic arch, type of mucosa, adaptation of supports to the niche and extension of the saddle / A desadapta??o da base das pr?teses parciais remov?veis (PPR) com o tecido fibromucoso ? causada pela reabsor??o dos rebordos residuais (RRR). A reabsor??o ?ssea inicia logo ap?s a exodontia de um elemento dent?rio e continua por toda a vida, sendo acelerada por fatores locais ou sist?micos. Objetivo: Avaliar o grau de desadapta??o das selas de pr?teses parciais remov?veis e os fatores que a influenciam. Metodologia: Foi realizado um estudo seccional com 81 pacientes usu?rios de PPR que instalaram suas pr?teses no per?odo de 2003 a 2007 (1 a 5 anos de uso) no Departamento de Odontologia da UFRN. Ap?s a anamnese e do exame f?sico, foi realizada uma moldagem com material a base de poli?ter, utilizando a base da pr?tese como moldeira, para copiar o espa?o existente entre a base da sela e o rebordo residual. A base da sela foi carregada com o material de moldagem e levada em posi??o na boca, fazendo-se press?o sobre os apoios. Ap?s a polimeriza??o, removeu-se o material de moldagem da sela e realizou-se a medi??o da espessura do molde com o aux?lio de um paqu?metro manual. Resultados: A desadapta??o da sela aumentou significativamente a medida que aumentavam os anos de uso (p=0,005). Indiv?duos com 50 anos ou mais, apresentaram maior desadapta??o do que indiv?duos mais jovens (p<0,001). As pr?teses dentomucossuportadas obtiveram maiores m?dias de desadapta??o do que as dentossuportadas (p<0,001). O tipo de mucosa fl?cida apresentou piores resultados de adapta??o sendo estatisticamente diferente da mucosa resiliente (p<0,001). Quanto maior a extens?o da sela, maior a desadapta??o (p<0,001). O arco antagonista dente natural apresentou melhores resultados em rela??o a PPR e pr?tese total (p<0,001). A desadapta??o da sela em extremidade livre foi menor pr?ximo ao dente pilar e maior na regi?o mais posterior da sela (p<0,001). A adapta??o dos apoios aos nichos quando se encontrava ruim obteve maior desadapta??o da sela comparadas as adapta??es do tipo boa e regular (p<0,001). Selas localizadas em regi?o posterior do arco obtiveram maiores desadapta??o que as selas em regi?o anterior (p=0,023). Conclus?o: A m?dia de desadapta??o da sela sobre os rebordos residuais foi de 0,27mm, podendo-se concluir que, mesmo com o uso da PPR, a redu??o da altura ?ssea foi pequena dentro do per?odo de 1 a 5 anos de uso. S?o fatores que influenciam na adapta??o da base da sela de PPR: tempo de uso da pr?tese, idade, via de transmiss?o de for?a para o osso alveolar, local da ?rea desdentada, arco antagonista, tipo de mucosa, adapta??o dos apoios nos nichos e extens?o da sela

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / A incorporação do diacetato de clorexidina em resinas macias para reembasamento de próteses pode se tornar uma boa alternativa na terapia com antimicrobianos usados para candidíase oral, uma vez que é independente da cooperação do paciente. Este trabalho teve como objetivo analisar a hipótese que a incorporação de diacetato de clorexidina em resinas macias não alteraria as suas propriedades físico-químicas. Foram analisadas duas resinas macias, uma à base de polimetilmetacrilato (PMMA) e outra à base de polietilmetacrilato (PEMA), com a incorporação de 0,5%, 1,0% e 2,0% de diacetato de clorexidina, além do grupo controle sem diacetato de clorexidina. Os espécimes foram armazenadas em água destilada a 37 durante 2hrs, 48 hrs, 7, 14, 21 e 28 dias e analisados quanto a cristalinidade do polímero através da difração de Raios X, a dureza mensurada com durômetro na escala shore A, o grau de conversão dos monômeros pela Espectroscopia de Infravermelho Transformada de Fourier (FTIR), a lixiviação de monômeros residuais e a liberação da clorexidina por Cromatografia Líquida de Alta Performace (HPLC). Os resultados mostraram que quanto à cristalinidade dos polímeros nas resinas macias à base de PMMA e de PEMA não alteraram após a incorporação de clorexidina, o que está relacionado à dureza Shore A, que aumentou ao longo do tempo, mas sem alteração significativa para nenhuma das concentrações de diacetato de clorexidina testadas. Já quanto ao grau de conversão, após a incorporação de clorexidina, a resina macia à base de PMMA não apresentou diferença estatisticamente significativa (&#1088;>0,05), porém a resina macia à base de PEMA apresentou diminuição significativa do grau de conversão (p<0,05), o que refletiu no aumento significativo da lixiviação de monômeros residuais nas concentrações 0,5% e 1,0% de clorexidina (p<0,05), principalmente nas primeiras 48 horas nessa resina. A resina macia à base de PMMA não apresentou alterações do padrão de lixiviação desses monômeros (&#1088;>0,05) e para ambas as resinas a cinética de liberação de clorexidina foi relacionada à lixiviação de monômeros residuais, que para a resina macia à base de PEMA foi maior significativamente nas primeiras 48 horas (p<0,05) e para a resina macia à base de PMMA não teve alteração estatisticamente significativa (&#1088;>0,05) se mantendo até o último dia de análise. Desse modo, conclui-se que a incorporação do diacetato de clorexidina não afetou a cristalinidade dos polímeros, inalterando a dureza nas duas resinas, porém o grau de conversão sofreu diminuição após a incorporação de diacetato de clorexidina na resina macia à base de PEMA, o que levou ao aumento da lixiviação de monômeros residuais e curta liberação de clorexidina; enquanto que a resina macia à base de PMMA, devido a não alteração significativa do seu grau de conversão, ocorreu menor lixiviação de monômeros residuais e liberação prolongada de clorexidina. / Chlorhexidine incorporation in soft denture liners can become a good antimicrobial treatment alternative for oral candidiasis, since it is independent of patient compliance. Considering this, the present study evaluate the hypothesis that chlorhexidine diacetate (CDA) incorporation in soft denture liners would not change their physical-chemical properties. For this, two soft resins were tested, one based on poly methylmethacrylate (PMMA) and the other based on poly ethylmethacrylate (PEMA), which received 0.5%, 1.0% and 2.0% of CDA incorporation, in addition to a control group without CDA. Specimens were stored in distilled water at 37 C during 2 hrs, 48 hrs, 7, 14, 21 and 28 days, then analyzed for polymer crystallinity through X-Ray diffraction, Shore A hardness measured with a durometer, degree of monomers conversion by Fourier transform infrared spectroscopy (FTIR), the leaching of residual monomers and release of CDA by high performance liquid chromatography (HPLC). Results showed that polymer crystallinity of PEMA and PMMA were not changed after CDA incorporation, this results is related to Shore A hardness, which increased over time, but not for any CDA concentrations tested. Considering the degree of monomers conversion, PMMA based resin did not present significant statistic difference (&#1088;>0.05), however the PEMA based resin had a significantly decrease on its degree of conversion (p<0.05), which was reflected in a significant increase of residual monomers leaching from PEMA based resin with 0.5% and 1.0% CDA incorporation (p<0.05), mainly in the firsts 48 hours. PMMA based resin had no alteration on its monomers leaching (&#1088;>0.05) and for both resins their CDA release kinetics was related to the monomers leaching, which for PEMA based resin was significantly greater in the first 48 hours (p<0.05) and for PMMA based resin was more sustained up to the last day of analysis. Thus, it is concluded that CDA incorporation do not affect polymers crystallinity and do not change their hardness, but the monomers conversion degree decrease for PEMA based resin, leading to an increase of residual monomers leaching and shorter CDA release, while for PMMA based resin, because of no change on their monomers conversion degree, there was less residual monomers leaching and prolonged CDA release.

During the so-called “Miljonprogrammet”, over a million homes were built in Stockholm. As the buildings mature, parts of the buildings reach their technical life times and it is time to renovate them. At a time when the environmental impact of humans is a hot topic, it is appropriate to take the environment into account when deciding upon which restoration method to use. The sewage pipes are one of the important building parts in need of repair. This can be achieved by for example traditional pipe replacement or Cure-In-Place-Pipes (CIPP-lining).The goal of this study is to investigate and compare the environmental impact of traditional pipe replacement versus the use of the relining method CIPP lining by conducting a comparative life cycle assessment (LCA). The methods differ in the way that traditional pipe replacement demolishes the outer layers of the bathrooms and remove the old pipes to replace with new and restore the surface layers while CIPP-lining renovates the pipes from the inside with the use of a flexible liner.The purpose of the study has been to clarify the differences in environmental impacts of the different methods in a clear and easily understood way and thereby also simplify the decision-making process of property owners in need of renovation.With aid of the guidelines in ISO standards 14040 and 14044 a correct methodology has been used to ensure that the level of this work will be as high as possible. In combination with the software SimaPro specifically developed to handle the creation of various forms of life cycle assessments and the ISO standards a complex system been analyzed in detail.The results of the study show that CIPP-lining generally cause less environmental impacts than the traditional pipe replacement method. The analysis of 14 selected impact categories show that CIPP lining is preferable in 13 categories and that the traditional pipe replacement is preferable in 1 category. The sensitivity analysis show that the results change drastically depending on how much of the materials and energy used to demolish and reconstruct the outer layers of the bathroom one chooses to allocate to the new sewer pipes.The results show that the CIPP-lining results are dependent on the consumables and the liner assembly processes while the energy usage of the production process does not have a large impact on the results. For the traditional pipe replacement the results show that the consumable process is clearly the biggest impact while the piping production inflicts the least impact on the result.

The doctoral thesis deals with an analysis of thermoplastics pipes in a soil environment, in particularly, pipes performed by using trenchless technologies. In the doctoral thesis, experiments of polyethylene pipes loaded by external hydrostatic pressure were performed. The aim of the experiments was to determine a behaviour and load-bearing capacity of the polyethylene pipes loaded by external hydrostatic pressure. For the experiments, a steel pressure chamber was designed and produced which allowed loading and observing a pipe during its loss of the stability. Mechanical properties of the pipe material were determined based on the tensile and bending tests. The series of detailed numerical analyses of the pipe experiments were performed. Various material models which take into account elastic, plastic and viscous behaviour of thermoplastic materials were used. In addition, series of standardized calculations of polyethylene pipes installed using trenchless technologies were performed. The aim was to create new design diagrams for practical assessment of these pipes placed in the partially deteriorated old pipes. In the case of the deteriorated old pipe, a numerical model for determination of design coefficients was created. These design coefficients were verified with standard values. Then, the results of the numerical model were compared with the results of the more complex numerical model which better take into account pipe-soil interaction of various soil types.