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  1. happyam

    Spectacle Blind

    I am sorry for my naive question and please forgive me as I am new to spectacle blind. As Zdas04 said, a contractor used paper gasket. When I saw the paper gasket, I just wonder how can the change-over be done efficiently. Therefore, I come here and seek for your expert advise. Apart from the...
  2. happyam

    Expansion joint for above ground pipeline

    Thanks so much for all your advice! The Flixborough incident is really breath-taking. Of course we prefer taking expert's advice for the expansion joint design. I would just like to know more about it. And EJMA really helps a lot. Again thank you very much for the advices.
  3. happyam

    Spectacle Blind

    Spectacle blind are used for easy change-over when physical isolation of pipe is needed. But I always have a question in mind, how can we remove the old gasket as well as adding a new gasket within the limited working space? Many thanks!
  4. happyam

    Expansion joint for above ground pipeline

    In order to absorb the thermal expansion of an above ground steel pipe, it is decided to install an expansion joint for the pipe. However, when it comes to the specification of the expansion joint, I don't know how to start. Is there any standard/reference which I could refer to? Many thanks!
  5. happyam

    Flow induced crystallization of HDPE

    Thanks for replying. Now I realize that Shish structure improve the properties of polyethylene (i.e. in UHMWPE) And I am now looking at the mechanical properties of the following polymer crystal micro-structures. 1. Spherulite of different sizes 2. Elongated spherulite 3. Columnar Crystal &...
  6. happyam

    Flow induced crystallization of HDPE

    Hi all, Recently, I hear about a process called "flow induced crystallization (FIC)". After some preliminary study, it seems to me that FIC refers to the crystallization of polymer at temperature above its melting point due to the present of shear stress. And this kind of crystallization...
  7. happyam

    Butt Fusion of HDPE Pipes

    Hi all, It is common for us to connect HDPE pipes by means of butt fusion. However, I found that there are different standards on fusion parameters. For example, DVS 2207-1 WIS 4-32-16 GIS PL2/3 ISO 21307 UNI... Each of the above standards refer to their specific set of fusion parameters...

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