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.


Investigations concerning uPVC drain and sewer pipes and fittings

 

Drainage and Sewerage

Plastic Pipes Conference Association # 1974 Southampton

Vaelimaa

The experiences of utilizing uPVC pipes as. pressure pipes for fresh water have been both extensive and favourabie, In recent years uPVC has also been introduced as material for relatively thinwalled’ drain and sewer pipes buried in the ground. In connection with this development a lot of research work has been carried out in many countries concerning both soil mechanical problems as well as plastics material long term strength aspects.

Of special interest is the long term strength and behaviour of injection moulded fittings, as they previously have been manufactured utilizing a raw-material with lower molecular weight (lower K value) and lower softening point (Vicat point) than is valid for the pipes.
The long term practical behaviour of pipes and fittings has been simulated with different test methods, the best of which seems to be the box loading test, ie. the BLT method (BS 4660).

A contribution to highlighting the various problems involved in these subjects was given ina paper entitled “Investigations concerning uPVC water and sewer pipes and fittings” by Lars-Eric Janson and Pentti Valimaa (Pipes & Pipelines International, Jan-Feb, 1973), /1j.
In this paper it was clearly stated that the long term strength of uPVC material is strongly influenced by the K value and the Vicat point in such a way that the strength decreases with the reduction of these values.

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

Related papers

1982 York : Gravity Sewage Pipes of UPVC for 10 Years in Use

Author(s) : Vaelimaa

During the time 1968 to 1982 uPVC pipes have been introduced and applied for drainage and sewer installations in Finland. Development consists of work for material technics, product standards and...

1979 Brigthon : A Study of Long-Term Strength and Creep Rupture in uPVC Plastics Pipe

Author(s) : Jumppanen, Leppaevuroi, Vaelimaa

The influence of processing variables on long term strength of pipe materials and on long term resistance values to internal pressure of pipes have been studied by the use of axial creep and creep rupture tests and standard...

Members of the Association

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