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  1. CanuckMiner

    Diaphragm Cylinder

    We have some old details (from "before my time") that use (Norgren) Martonair diaphragm cylinders (also referred to as pot cylinders) to open a latch mechanism. To my knowledge, Norgren no longer makes these and so I am searching for a suitable replacement. The cylinder I am looking for will...
  2. CanuckMiner

    NFPA 13 - Area of Demand

    In a question related to my recent thread in regarding Water Demand, can anyone give me an idea about how to select an area of demand? The project I'm working on has a total area of more than 10,000 sq feet (but less than 25,000 sq ft), laid out in an H-pattern (i.e. resembling the letter H)...
  3. CanuckMiner

    Water Demand - Pipe Schedule vs. Hydraulic Methods

    I'm working my way through an automatic "wet" sprinkler design for an Ordinary Hazard Group 2 area. I'm having trouble definitively determining whether to use the pipe schedule method or the hydraulic method (7-2.2 & 7-2.3 in NFPA 13) to determine water demand. It seems to me that...
  4. CanuckMiner

    Stainless Steel to Carbon Steel Flanges

    We have an application where we have a stainless steel tank with a flanged outlet (also stainless steel). We are looking to connect a carbon steel valve (flange) to the outlet. I'm wondering if there are any (code/standards) rules prohibiting or advising against connecting stainless steel...
  5. CanuckMiner

    Machine Design Books by Shigley

    I was wondering if anyone can comment on the Standard Handbook of Machine Design by Shigley & Mischke? I have the Fifth Edition of the same authors' Mechanical Engineering Design. Websites list the Handbook as being 1700 pages. My text (noted above) is my coursebook from university and is +/-...
  6. CanuckMiner

    Compressed Air "Cannon"

    I have a problem which at first glance appears easy (at least I thought it was), but for some reason, I can't seem to work it out. Any ideas or solutions would be appreciated. I am designing a system that has a compressed air pipe which more or less acts as an air receiver. Dimensions are...

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