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  1. stewbaby

    Commissioning an internal floating roof tank and prepping for Maintenance

    The key is to limit this transitional time between the 'lean' and 'rich' atmospheres so you don't stay in the explosive range. Standard floating roof storage tank RAGAGEP though does not typically take any special precautions into account (when designed and operated to API650, API 2510, NFPA...
  2. stewbaby

    Ball-valve insert

    Sounds like you want a butterfly valve (squeeze between flanges...if there is room to spread them). I know of no ball valve insert that is similar to how check valves have the 'insert' or 'wafer' style.
  3. stewbaby

    Temperature to consider for gaskets design

    "suitable for all expected service conditions" so max fluid temp. Never hurts also to consult the manufacture of the gasket you intend to use.
  4. stewbaby

    Adding a substance to water to reduce its specific gravity for pump testing

    At near boiling, you can get the SG down some from your reference density but not near as much as you want of course.
  5. stewbaby

    ISOMETRIC DRAWINGS

    I do it both ways depending on the job and contract/contractor. Best to put the test/hydro, stress relieve and such on the ISO, but sometimes, it's all similar fluid and unnecessary...such on asphalt lines in the tankfarm.
  6. stewbaby

    Anybody knows what kind of valve is this?

    It's just an old double ported globe valve best I can tell...I assume there is a reason to throttle the flow there? Sure is a big clamp downstream on a previous corroded / eroded area so something is going on there...seems like maybe the entire section should be replaced. Anyway, if needing a...
  7. stewbaby

    Why would a mag drive be impractical for non corrosive applications?

    Goulds has mag drives also so it isn't a mag vs Goulds thing really. Even if going mag, I'd still give Goulds a shot at it. A min flow spill back can help with that run dry concern. Only real drawback to your application, besides the initial outlay, would be the efficiency losses so maybe run...
  8. stewbaby

    Flexible Tank Floor Affecting Agitator's Installation

    Three images from a similar install for asphalt. We use a heavy weight such as a W beam or section of railroad steel to hold the floor deflection down till the steady bearing is installed if needed. The product will hold it down in service and when the mixer is running. Note that the roof...
  9. stewbaby

    Thermal Oil Heater Piping system

    You're at 8+ FT/S in that 1" pipe. I'd argue you want to be 1 to 2 FT/S at most...enough to have turbulent flow and push air out but with as much residence time as possible to allow heat exchange. If circuits are closed off, you'll push velocities even higher of course. I've typically put a...
  10. stewbaby

    H.4.1.7 manhole cover shall be provided with a suitable vent

    Not a tank designer, just a long time purchaser / project manager of installations. I have to assume their intention is to relieve trapped vapors. They of course want the sealed manway and a higher vent (versus just a cover) so product during an upset or fire fighting liquids can't get into...
  11. stewbaby

    Anchor points in piping

    I would recommend a expansion 'loop' versus the bellows. If it has to be a bellows, don't skimp and make sure it is robust and can take the pressures it could see under adverse conditions (especially where a PD pump can be reversed).
  12. stewbaby

    Any updates on handrail in stairway requirements per latest OSHA standard?

    Thanks all. I'll agree with 'they made a mistake / omission' side of the argument. They clearly want handrails and deem a guardrail at 42" to be too high. Worst case, we spend just a little more money but at least they get the protection on a 'open both sides' as they would on the 'open one...
  13. stewbaby

    Any updates on handrail in stairway requirements per latest OSHA standard?

    Nobody had an update? <44" open both sides doesn't need a handrail included?
  14. stewbaby

    Asphalt PMAC (polymer modified asphalt cement) storage best practice - API RP 2023 withdrawn

    I work for a company that operates numerous bulk asphalt storage and paving grade production facilities. We've been using API RP 2023 (Guide for Safe Storage and Handling of Heated Petroleum...asphalt...) as a design guide...especially concerning pyrophoric iron sulfide deposit prevention...
  15. stewbaby

    NDT HDPE

    I'm not familiar with how well it covers testing ,but I think you're going to want AWWA C901 or C906 for polyethylene pressure pipe. ...and for firewater, our insurer requires it be FM approved pipe and fittings.
  16. stewbaby

    handrail requirements per latest OSHA standard

    Anyone contacted OSHA for an interpretation on this to be sure? I read the same thing you guys do, but ouch...especially on tank stairs.
  17. stewbaby

    Industrial ladder design in the wake of OSHA 1910.28 revisions

    Nobody looking into this yet? Just wanting to discuss opinions / interpretations. I know I can fire off inquiries / clarification request to OSHA but was wanting to see what others in the industry were doing first. The less than 24' ladder 60' up on a process tower without a cage or ladder...
  18. stewbaby

    Industrial ladder design in the wake of OSHA 1910.28 revisions

    Definitely need OSHA to define a 'lower level' I guess. There definition doesn't help (Lower level means a surface or area to which an employee could fall. Such surfaces or areas include, but are not limited to, ground levels, floors, roofs, ramps, runways, excavations, pits, tanks, materials...
  19. stewbaby

    Industrial ladder design in the wake of OSHA 1910.28 revisions

    It is my understanding that OSHA 1910.28(b)(9) will no longer accept cages as fall protection on new ladder installs in a little over a year from now. My typical ladder application is on small diameter 40' tall oil / asphalt storage tanks or refinery columns / towers. If I buy a tank tomorrow...
  20. stewbaby

    OSHA industrial guardrail requirement changes - 1910.29

    Exactly why I haven't asked them :-) "it typically takes a while, and the interpretation is not always useful or logical." ...may not like the answer (if / when i ever get it).

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