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  • Users: Biggy
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  1. Biggy

    Boiler Insulation Materials

    Hi folks, Heres one for you... We have just stripped the insulation off one of our Boilers, most of it is fairly poor condition so it now needs replacing. If I ask our insluation contractor he will just put Rockwool on and clad it. Is this the best material around, or is there something that...
  2. Biggy

    ASTM A106 GrB. What is the Temp and Press range

    Working for a tight company who wdon't like buying standards. Can anyone let me know where I can get the Temperature and Pressure specification of ASTM A106 GrB pipe. I am especially interested in the low temperature limits. Regards, Biggy
  3. Biggy

    Painting GRP Tanks.

    I have a couple of very 'tired' looking Celmar (PolyProp)Lined GRP (Fibre Glass) tanks, internally there is nothing wrong, but the outside has lots of staining from 'old' weeping joints, rust staining from rain/mild steel fittings etc. I have been asked to give them a coat of paint! So the...
  4. Biggy

    What are Hazen and Gardner scales

    Can any one help, What does 50 Hazen mean, what is it referring to. Also what does Gardner measure. Biggy.
  5. Biggy

    Mild Steel and HaOH?!?!

    I'm about to spec up and install a pipe run for 24% NaOH at Ambient Temp. I'm fairly sure that I don't need to stress relieve it. My main question is on passivating prior to use. I was always under the impression that caustic lines need passivating prior to start up. (i.e fill with caustic...
  6. Biggy

    Do Hastelloy C276 threads gall??

    Does any one have any experience of Hastelloy C276 threads galling, like stainless steel does? Also does anyone have any data on the coefficient of friction for Hast C276 threads? Thanks in adavance Biggy
  7. Biggy

    Do Hastelloy C276 threads gall?

    Does any one have any experience of Hastelloy C276 threads galling, like stainless steel does? Also does anyone have any data on the coefficient of friction for Hast C276 threads? Thanks in adavance Biggy
  8. Biggy

    How do I calculate tightening torque???

    This is probably a simple question to some who does it everyday, but I'm struggling.... How do I work out the torque that should be applied to nut to give a specified 'clamping' force on a gasket. I have a connection comprising of a single nut(female thread!) screwing on to a male threaded...
  9. Biggy

    Free or Cheap 2D Cad System?

    Does anyone know of a cheap(or even freeware) 2D Cad Package that has a similar front end to Autocad. Basically I want a small CAD package for doing layouts, sketches and possible Isometric sketches, that I can use my existing Autocad Skils on, without to much 'retraining'. Any ideas? Biggy...
  10. Biggy

    Non Asbestos Gaskets on Chlorine??

    With the use of CAF Gakets on chlorine duty being prohibited in the UK from the end of ther year, I need to find an alternative material. What Non-Asbestos joints are being used around the world (for use on Dry Liquid Chlorine and Dry Gaseous Chlorine)? Many thanks in anticipation....
  11. Biggy

    Non Asbestos Gaskets for Chlorine??

    With the use of CAF Gakets on chlorine duty being prohibited in the UK from the end of ther year, I need to find an alternative material. What Non-Asbestos joints are being used around the world (for use on Dry Liquid Chlorine and Dry Gaseous Chlorine)? Many thanks in anticipation....
  12. Biggy

    What are NR Levels?

    I have been offered a silencer for a very 'noisy' fresh air supply to an emergcey control room. I have been told that "this silecer will achieve an noise criteia of NR45." Can anyone tell me what this acutally means and how loud the noise will be with this silencer? Thanks, Biggy

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