I'd expect the tensile stress @20 °C and @ 35 °C to be almost the same. In any case the formulas reported in EN 13480-3 refer to Rp,1.0 and not Rp,0.2.
As suggested by XL83NL, you could take a look to EN 15515-4, which as standard reference for X5CrNi18-10 (EN 1.4301EN) addresses to EN 10269...
Mass flux varies linearly from the section 1 onward, as you are going to have part of the mass flow leaving the header at each branch. In order to have even flow distribution you have to minimize the pressure drop along the header in comparison to that of the branches.
jangolobow,
Effect of pressure? I'm not clear what you mean specifically.
You can use tables from EN 10088-3 where you can find mechanical properties of the material of interest at room and at different temperatures, but you're not going to find any mechanical properties vs pressure tables.
I suggest you to put your hands on the literature quoted in the references.
The definition for the modified Reynolds number is:
Re(mod) = Re* (b/L)
For a high aspect ratio (high H/b) the hydraulic diameter is:
Dh = 4A/P = 4 (H*b)/[2(H+b)] ≈ 4H*b/(2H) = 2b
There’s anyway a difference by a...
Take a look at the following link (reference is ISO 5167-1)
https://nfogm.no/wp-content/uploads/2019/02/1996-24-The-Orifice-Plate-Discharge-Coefficient-Equation-Reader-Harris-NEL.pdf
Not my field of expertise, anyway the attached file could give you some guidancehttp://files.engineering.com/getfile.aspx?folder=3f36e29a-a376-4d16-8ec1-c817de9391b9&file=TAPPI-TIS410-14.pdf
You have to calculate the back pressure on your condensate line (0.5 bar for height difference + pressure drop due to friction from the steam trap to the tank + pressure drop due to fittings). Then use steam tables to evaluate saturated liquid temperature. Please note when sizing condensate line...
...So calculate air properties at T=20 °C (air stream temperature) for a first attempt.
Then calculate the plate temperature with:
Tw – Tair = (q*L/k)/[0.6795Re^(1/2)Pr^(1/3)]
q is the heat flux. The other symbols should be quite clear
Now evaluate again properties at film temperature and...
HI 9.8 and specifically para 9.8.7.2 reports the following relationship:
S/D = 1.0 +2.3Fd
where:
S = submergence
D= Inlet O.D.
Fd = V/(gD)^0.5 Froude number
g = Acceleration of gravity
V = velocity at inlet bell face
With your numbers S is slighly more than 8"
What are you probably making reference to is called flash steam. You can find some insight at the link below
http://www.spiraxsarco.com/Resources/Pages/Steam-Engineering-Tutorials/condensate-recovery/flash-steam.aspx
Jake,
The file in the attachment can give you further insightshttp://files.engineering.com/getfile.aspx?folder=f50df09f-e609-4a29-a86b-4ab7ab861841&file=Eurovent_REC_1-11_-_Fans_and_system_stall_-_Problems_and_solutions_-_2007.pdf
Rely on fan performance curve. Establish your system curve and find the working point of the fan. Try to build your system curve attentively to be sure you will operate your fan in a region far from the stall region indicated on the fan performance curve. With axial fans, which I tend to think...
