abbver98
abbver98
(OP)
hi,
thank you for your answer but I would know more details:
is the formula e = Pc*(D0/2)*f*z
or e = (Pc*D0)/2*f*z
I think it's the first one. isn't it?
please, can you explain me the meaning of each parameter? f and z?
thank you very much
regards,
thank you for your answer but I would know more details:
is the formula e = Pc*(D0/2)*f*z
or e = (Pc*D0)/2*f*z
I think it's the first one. isn't it?
please, can you explain me the meaning of each parameter? f and z?
thank you very much
regards,





RE: abbver98
Z : is like E welding factor
f : is the allowable stress in EN standard (13445 and 13480) it's calculated, so you had to have yield strength (at temperature and room) and tensile strength.
I'll come back with values
RE: abbver98
steel other than austenitic steel :
f=max(ReH/1.5 or Rp0.2/1.5; Rm/2.4)
austenitic steel :
f=max(Rp0.1/1.5; min(Rmt/3 ; Rp1.0t/1.2))
steel castings:
f=max(ReH/1.9 or Rp0.2/1.9; Rm/3.0)
in the other hand : (some considerations are underlined in the standards)
-100% NDT : z=1
-Random NDT : z=0.85
-0% NDT : 0.7
RE: abbver98
I have some data "f" for stainless steel at room, high and low tempreture.
but, do you know how we can evaluate the max allow pressure whitout using the the thickness formula or process engeneer?
regards,
RE: abbver98
when you have 100%ET + no random test or no random + single butt, z takes the value of 1.0?
thanks
RE: abbver98
What is ET ?
RE: abbver98
RE: abbver98
ET means Eddy-current testing
In that case,I think z=0.85 because of the current testing!
isn't it?
RE: abbver98
in case of 100% NDT, e.g. EddyCurrent or X-ray, than z=1.
Regards.
RE: abbver98
best regards.
RE: abbver98
because, 100%ET is not considered as 100%NDT
http://www.outokumpu.com/pages/Page____11024.aspx
????
Leyla
RE: abbver98
May be your're right, but be aware that these requirements differs depending on the applicable design code.
ASME B31.3 may stipulate that z=0.85 in case of ET, but do the EN standards use the same safety factors?
From the Outokumpu site you are refering to it seams that the EN standard do accept a factor of 1.0 in case of ET.
ASME B31.3 only allows for 1.0 if 100% RT, but it is not clear (sofar) if they accept ET as an alternative for RT.
Regards.