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  1. EngrPaper

    Hot Dip or Cold Galvanized for Stud bolt in Piping

    Or out of left field, you can use PTFE or XYLAN coatings. We commonly use these in chemical plants for the harsh environments.
  2. EngrPaper

    Deflection of plastic pipe

    Different codes have different standards. Even B31.1 when calculating its suggested maximum span uses a combination of a sag limit and a stress limit (Note C under table 121.5-1). In practicality, the engineering firms usually have internal standards for what is an acceptable sag for the sake...
  3. EngrPaper

    Question for California PEs: PE as RIC for a Business — Legal and Compliant

    Just to expand a bit on this. I think number 2 would not work if merely because you couldn't have "your" projects. You cannot advertise engineering services without being a PE and your company being licensed as such. Thus you could run a drafting company and advertise to engineering firms...
  4. EngrPaper

    Single Line on Piping

    "Single Line Drawing" is typically an electrical term for high level electrical system architecture. Perhaps you are thinking of the above orthographic drawing style where smaller bore lines are drawn with a single line for the centerline of pipe. There are a few types of drawings that are...
  5. EngrPaper

    PMP Qualification v APM Project Management Qualification (PMQ)

    Similar to what CWB1 said at the end there - the only people I have ever seen who valued a PMP certification were other people who had PMP certs. So it all depends on who you are trying to impress. Would it hurt? No. But its also just another cash grab from a certification group.
  6. EngrPaper

    Questions on becoming a Piping Engineer

    The "without taking a pay cut" part is hard to help with if we don't know the ball park you are looking for. I would think an entry level designer would be a significant pay cut compared to an entry level engineer. What skills do you have that relate into the piping world? If none, you are...
  7. EngrPaper

    Lap joint flange facing

    The hub of the lap joint forms a raised face. The backing ring sits behind the hub.
  8. EngrPaper

    Can use Concentric Reducer at Flare Line

    Concentric reducers are two concentric circles for inlet and outlet, they do not have a flat side. So when using concentric reducers, there is always a liquid pocket when flowing from large to small side. Eccentric reducers have an offset from inlet to outlet so that there is a flat side. If...
  9. EngrPaper

    Can use Concentric Reducer at Flare Line

    Other way around there.
  10. EngrPaper

    Settlement of SS Pipe to Sleeper

    Shoes are a normal solution for this, especially if your pipe is insulated. Similarly, you can just rest the pipe on a non-metallic pad. There are even some load rated products for this like I-rods which you can buy by NPS, height, etc.
  11. EngrPaper

    Adjustable Dip Pipe in Pressurised Vessel

    I second having multiple dip tubes. Having some manner of variable component would add complexity and error to a process that could essentially just be a hot swap.
  12. EngrPaper

    Steam generation

    The other limiting factor on the low temp available in your flue gas is the dew point. Flue gas often contains some nasties that you don't want condensing out and corroding your equipment. So if you have the composition of your flue gas, you need to figure out its dew point and remain a margin...
  13. EngrPaper

    RPTFE vs PEEK ball valve seal

    As long as both are okay for pressure and service, I would go with RPTFE. PEEK is great at high pressure, but can be a bear to turn (really stiff seat).
  14. EngrPaper

    Furnace design

    Not my area of expertise, but I would think it would have to do with flame direction, flame length/velocity, and general shape of the furnace as LittleInch noted.
  15. EngrPaper

    Pipe wall thickness sizing

    Confirming the above on a design pressure at a minimum of 290. Design pressure, and its coincident design temperature, are the physical scenarios the pipe will experience that result in the greatest wall thickness/rating. Burst pressure is not a factor.
  16. EngrPaper

    Tech. Gathering Data for a PE

    My thought is generally yes it can be. It is quite common for the field work to be done by techs, designers, or other surveyors for projects of varying size. As long as the proper field work is done (usually at the request of the EOR to get x, y, z datapoints especially) and the raw data is...
  17. EngrPaper

    Steam piping

    Yes - that is actually the only use case I have ever used stainless in steam piping before. Humidification system for a high purity aerospace application.
  18. EngrPaper

    Steam piping

    Steam piping material selection is temperature dependent. In almost all cases, carbon steels are fine. If you are getting really hot (650F+, depending on the steel), then you might either need to evaluate for creep and/or switch to a chrome moly. SS is also fine in most normal cases but I...
  19. EngrPaper

    Help Pipe Support Engineer with Moment Connections

    So without doing any math, I would make a few changes. First, I would opt for a trapeze off the bottom of the W beams. That way you go direct into your moment connection on the flange of the W beam without a torsion bar in the middle. Second, I would opt for limit stops, u-bolts with limit...
  20. EngrPaper

    Boiler feed water pump shutting down when blowing down

    Relatively hard to determine without pictures of the layout, but why would sucking air be a diagnosis if this only happens during blowdown? I wouldn't think your blowdown would affect the BFW tank level beyond just standard pump rate.

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