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Recent content by glynnmack

  1. glynnmack

    Piping Lower Limit Surface Temperature

    Thanks, Matt. I did find this interesting NASA study, but it had some unique design conditions so I couldn't draw the most applicable conclusions. It also referenced ISO-13732-3, but I don't have access to that code. In my (limited, 6 years) experience in power plant engineering, I haven't...
  2. glynnmack

    Piping Lower Limit Surface Temperature

    I'm aware of OSHA requirements to insulate hot piping (generally above 140 deg F) for personnel protection, but I can't seem to find any reference about a lower limit. Is there a code or industry practice for cold piping personnel protection? I imagine touching a pipe containing a fluid at...
  3. glynnmack

    Access 2007- Query Repeating Records

    I found that I was creating a Cartesian product. Basically, the joins and order of my query (I was looking for EquipmentType in tblReqDoc that matched those in tblProjectEquipment, instead of vice versa) caused 4 records for each of the 103 matching records in tblReqDoc. Or so I think...
  4. glynnmack

    Access 2007- Query Repeating Records

    Hi all, I'm building an access database to track documents required and received at different stages of a project. The query I'm designing is intended to create a record of the Equipment Type, Equipment Tag, and Document Type that was submitted with bid. Should be a pretty simple query, but...
  5. glynnmack

    18" Balancing Valve

    Thanks, hacksaw. We have settled on high performance butterflies, mainly for the lack of other viable alternatives and the fact that this does not need pin point control. It won't be automated, so any added expense was mostly unjustified.
  6. glynnmack

    18" Balancing Valve

    Hey all, I'm in a bit of a pickle trying to find 18" Balancing Valves on the discharge of Chilled Water Pumps. Not only can I not find any above 12" from the standard valve suppliers (Crane, Velan, etc.), but I've also been told that they would be very expensive and large (space is tight)...
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