Lugs or clips can be calculated with formulas by Mohs or Kellog, and check stress on pipe with WRC 107.
I´d use PVELite software lifting lugs analysis that include all that ( impact and ocassional loads factors can be considered). Ideally an analysis with NozzlePro software would be perfect for...
Hello and blessings to all.
I need to specify the flange face flatness manufacturing tolerances for a flange with rubber o-ring seal.
The flange is for a 2m diameter pipe custom design for cold water.
I have the o-ring groove design and required finishes, but noy sure how to specify the...
The only good use of the burst pressure I´d recommend is to compare the safety factor of the code you are using and the safety factor of the manufacturer (commonly based on cold water pressure tests not on code comitee criteria).
If your case is "special" and no public user can be related if...
I think you can include a maintenance keyed switch that cuts the energy to the solenoid so a manual mechanical release is the only way to discharge (keyed, controlled key use and lots of signs around, and trouble alert on panel).
What I see on MSDSs, deluge or mist is great for cooling/extinguishing ammonia containers. Of course the specific risk and site sould be analyzed by chemical risk expert in charge. There may be some issues with ammonia cloud control, icing of important parts, foam requirement, etc, but in...
Would better refer it as 100% of design agent amount with more specific explanation about the trim depending of the system technology.
If possible delete that requirement or change it as a more specific ítem optional cost information depending on clean agent system. A normal fast bidder would...
If you have a hydrant or sprinkler grid where noise, vibrations or pressure loses where a high Reynolds number would be an issue or if you want a "balanced" system, it is a desirable option to consider velocity limits, but not a code requirement. For example, a well code design may worry...
It may be complemented with local or AHJ requirements.
You go with class III and maybe a removable restricting device on 1.5 hose connection or hose valve may solve the class II req.
Most of the detector´s electronics are not for condensing wet environments.
I have used aspirating type Vesda with a condensate trap (piece of transparent pipe with a manual drain before the device) and works fine so far (tropical forrest área power plant). It collects some cm of water on wet...
Yes, without the CA the required thickness would be 2.02mm.
With a ca of =0, 6-Sch40 holds 1150psi aprox.
With a ca of =2mm, 6-Sch40 holds 810psi aprox.
This is approximate, many variables: check on respective ASTM if mill tol. is 12.5%, allowable stress is still 4.6kpsi on the current code...
I´d also choose B31.1 (2007) as an aprox. reference point.
For a 6" inch pipe with an arbitrary 2mm corrosion allowance, the required thickness for 20bar at room temp is 4.02mm and 6"Sch40 is actually 7.1mm, so no problem with your pressure with SCH40. Smaller diameter same Sch are safe too and...
On NFPA 72 a positive alarm procedure allows on certain conditions to prevent automatic alarm. Of course not all facilities have personnel to respond in such way, so not always apply and only if AHJ allows.
That is what I was seeing, depending on how big is the system between the pump and the dry valve, you have a wet system to consider or not. Where is the limit? Other point is if the DPressure of pump at the start is too big, is it recommended to have JP to define a good star set point for the...
I understand that downstream the dry valve the jockey pump is not involved nor needed, my doubt is if if the water supply (upstream) this valve need a pressure maintenance pump.
So the line between the pump and the upstream side of the preaction valve is also dry? If so when the pump starts the water would fill or refill violently the pipes, is that Ok? I am missing something?
