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Recent content by PagoMitch

  1. PagoMitch

    White Rust in HVAC Ductwork, again

    3DDave - good comment and question. Re: The AI - hence my comment. Thanks for yours. Last year I spent a few hours with CHAT GPT in an attempt to quantify the distribution of motor heat (inside an AHU) to downstream air and ducts. The Engineering 101 and basic Physics mistakes it made were...
  2. PagoMitch

    White Rust in HVAC Ductwork, again

    All, Thanks for the responses. Unfortunately, I am thousands of miles from the site, and the owner only brings our firm to the island a few times a year. In between our visits, the local Contractors pretty much run rampant. Our firm does not hire the Contractors. They are hired by the...
  3. PagoMitch

    White Rust in HVAC Ductwork, again

    All, So last year I posted a question re: how to resolve white rust on interior sheet metal duct wall. That thread has been closed, but here is the link: https://www.eng-tips.com/threads/how-to-resolve-white-rust-issues-inside-ductwork.521755/#post-9014179 I recommended to the owner that the...
  4. PagoMitch

    NFPA 99 - Dedicated Exhaust for Med Gas Storage Room

    3DDave - Point taken... But this project has been under construction for over 10 years... 10 years of Construction Admin weekly meetings on a project literally 5000 miles away, that was to have had a 24-month schedule. I just cannot keep fighting every issue; especially one involving a request...
  5. PagoMitch

    NFPA 99 - Dedicated Exhaust for Med Gas Storage Room

    3DDave - Thanks for the reply. In this case, as in many... neither I, nor the facility has the time to fight this borderline idiocratically (apparently not a word, but it should be...:-)) written code section. So instead I'll finish the design in compliance with NFPA, and the facility will...
  6. PagoMitch

    NFPA 99 - Dedicated Exhaust for Med Gas Storage Room

    Pedarrin2 - Thanks for the response. I understand the Code - I quoted it. However... the way it is written is appalling. "... cannot interconnect with other facility air-handling systems that serve locations containing combustible or flammable materials". For pete's sake... An employee in a...
  7. PagoMitch

    NFPA 99 - Dedicated Exhaust for Med Gas Storage Room

    I am designing a couple small Med Gas Storage Rooms in a Hospital; (4) K cylinders each of N2 and CO2 (about 300 ft^3 each tank, 1200 ft^ 3 each room, 2400 ft^3 on this floor). These will be in separate rooms, although it is technically not required. NFPA 99 2018 requires 1-hr walls, with...
  8. PagoMitch

    Non- Refrigerated Body Storage Temperatures?

    Thanks all, This is indeed a unique place. The population is about 50k, and they basically govern themselves with US aid. Which also means they need to comply with US standards (ICC Codes, NFPA, ASHRAE) for all major infrastructure, like hospitals. Unfortunately, there is a dearth of...
  9. PagoMitch

    Non- Refrigerated Body Storage Temperatures?

    All, Have an interesting HVAC project that is Morgue related. I have done a few full Morgues, with the required viewing areas, autopsy tables and body reefers. This is different. A facility on a remote island I am temporarily working at wants to increase their deceased body storage holding...
  10. PagoMitch

    Removal of rust inside improperly stored 6" steel piping

    All, It was indeed the pic of the o-ring sealing surface that finally convinced the Manager to say...NO. Thanks again all.
  11. PagoMitch

    Removal of rust inside improperly stored 6" steel piping

    Thanks gents for the knowledgeable comments. I have advised the Owners Rep I am dealing with that while there are a few ways to remediate this, all involving considerable time and expense, and the result will still not be equal to new pipe. You paid for new pipe; not refurbished pipe that may -...
  12. PagoMitch

    Removal of rust inside improperly stored 6" steel piping

    LitleInch - seems our posts passed each other. We are using VIC couplings; too hard to get reliable welders around here. VIC also provides some...flexibility... in piping systems during seismic events. This place is rated about the same as Los Angeles and San Fran for seismic concerns.
  13. PagoMitch

    Removal of rust inside improperly stored 6" steel piping

    A grit blaster is a great idea - as long as it could be put on an extension that is appx 10 feet in length to reach the halfway point. Air compressor should be no problem. I am more than a little concerned about the degradation of the cut groove that the gasket fits in. This is/was...
  14. PagoMitch

    Removal of rust inside improperly stored 6" steel piping

    LittleInch - Thanks. I did indeed add attachments - not images. Appreciate your loading the images.
  15. PagoMitch

    Removal of rust inside improperly stored 6" steel piping

    Did a search and could not get an apropos result. I'm assisting a US based facility on an island, and a Contractor has had a half dozen nominal 20' sticks of S40 A53B 6" grooved piping sitting outside in his storage yard. For years. It is to be used in a chilled water distribution system (40F...
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