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  1. gatech74

    Test Method for Wood Plank Roof

    I have an older manufacturing facility with a wood plank decking roof covered with a layer of gravel and tar and metal sheathing on top. The insurance company has asked for an analysis of the decking to determine if any needs to be replaced due to moisture content or deterioration. Is there a...
  2. gatech74

    Proven methods to determine the condition of old wood plank decking

    The building is protected by a sprinkler system. I believe their main concern was for collapse under excessive load such as snow. I can look for mill marks, but the exposed side has been painted several times and is covered by years of dust and oils from the manufacturing process. The wood is...
  3. gatech74

    Proven methods to determine the condition of old wood plank decking

    I have an older manufacturing facility with a wood plank decking roof covered with a layer of gravel and tar and metal sheathing on top. The insurance company has asked for an analysis of the decking to determine if any needs to be replaced due to moisture content or deterioration. Is there a...
  4. gatech74

    Silicone rubber outgassing and silicone migration

    Hi Gabriel, In my experience fully cured silicone will not migrate, however if the silicone is not fully cross linked and there is a carrier for silicone (oil/ fluid), and it is under a high enough temp and pressure, then the silicone may be able to migrate. From the sound of your note it...
  5. gatech74

    How to Determine if Spring Life has been Spent

    Hey Desertfox, I don't have a required pre-load. The spring doesn't need to be pre-loaded at all as long as I achieve a certain amount of load at given distances from fully compressed. The spring must compress to a height of 3.35" or less (fully compressed), and must produce a minimum load of...
  6. gatech74

    How to Determine if Spring Life has been Spent

    Thank you for the responses. I am trying to find a way to add additional spring pockets into my equipment, but I have not been able to add enough to achieve my desired load without running into similar spring issues (travel to solid). Thanks again.
  7. gatech74

    How to Determine if Spring Life has been Spent

    Thank you for the response Israelkk. The main piece of info I was looking for was whether the spring rate changes. What I can do is take the new length and calculate the load given a particular displacement to determine the allowable free length. Since I know I am loading the spring more than...
  8. gatech74

    How to Determine if Spring Life has been Spent

    I am trying to set a go, no-go limit for the die springs we use in our molding operation. One noticeable difference between new springs and old springs is the free length. We are using a Danly Die MAX Xl heavy load spring (part # 9-3220-26), which starts out with a 5" free length. In operation...
  9. gatech74

    Vacuum Tubing Wall Thickness

    I need to replace a section of 10" diameter Sch 40 PVC used as the main vacuum header, with carbon steel tubing. The vacuum system is under full vacuum and could occasionally experiece upwards of 300F air through this section of pipe due to a vacuum booster(which is why I am changing from PVC to...

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