plating, anodizing, & finishing Q&As since 1989
September 1, 2010
Hello I am Dhiraj from India
Actually we are the manufactures of PP storage tank. & we are manufacturing storage tank of HDPE (2200 dia. & 3000 mm height). While doing it we are facing one problem, that we are finished with the shell manufacturing without failure, but for nozzle fitting at the bottom side of tank, welding is not being getting stuck with shell surface; it's leaking heavily as the time goes on. for nozzle we are using HDPE pipe.so what will be the main reason behind this? is there any problem regarding properties of HDPE sheets/HDPE pipe/HDPE welding rod we are using?
Please I do need urgent suggestions.
Quality Department - Pune, Maharashtra, India
September 3, 2010
In the industry that work with poly tanks are common. Some of these tanks are welded using heat and poly rod. Upon expansion/contraction due to temperature changes these welds crack. To avoid this, a special internally heated very thin "knife" is used such that this hot knife is slid through the two sides to be welded leaving a fully fused joint. These fused joints, done properly, do not seem to crack.
Galvanizing Consultant - Hot Springs, South Dakota, USA