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API 5L B at temperature between -10¦C/+70¦C

API 5L B at temperature between -10¦C/+70¦C

API 5L B at temperature between -10¦C/+70¦C

(OP)
Hi,
I didn't find informations about steel temperature test in API5L standard. I have to admit that my copy is not the original one ...
Any way, the question: can I use the API 5L B at temperature between -10ºC/+70°C in a PED 97/23/CE certified pressure tank.

Other specifications:
Diameter - Thikness
1" - 3.3mm
1"1/2 - 3.6mm
2" - 3.9mm

Fluid: air

External Pipe Pressure:
- nominal pressure, 6-10bar
- test Pressure: 15bar

Internal Pipe Pressure:
- environmental pressure
- 10bar for 1 second max
(the pipe is the outlet of a pulse valve)

PED (http://ped.eurodyn.com/)requiers:

"[...]
The permissible general membrane stress for predominantly static loads and for temperatures outside the range in which creep is significant must not exceed the smaller of the following values, according to the material used: (See Guidelines: 7/14)
- in the case of ferritic steel including normalized (normalized rolled) steel and excluding fine-grained steel and specially heat-treated steel, 2/3 of Re/t and 5/12 of Rm/20 ;
- in the case of austenitic steel:
- if its elongation after rupture exceeds 30 %, 2/3 of Re/t
- or, alternatively, and if its elongation after rupture exceeds 35 %, 5/6 of Re/t and 1/3 of Rm/t ;
- in the case of non-alloy or low-alloy cast steel, 10/19 of Re/t and 1/3 of Rm/20 ;
- in the case of aluminium, 2/3 of Re/t ;
- in the case of aluminium alloys excluding precipitation hardening alloys 2/3 of Re/t and 5/12 of Rm/20.
[...]"

And
"[...] a steel is considered as sufficiently ductile to satisfy [...] if, in a tensile test carried out by a standard procedure, its elongation after rupture is no less than 14 % and its bending rupture energy measured on an ISO V test-piece is no less than 27 J, at a temperature not greater than 20 °C but not higher than the lowest scheduled operating temperature. [...] "

Thans
Carlo Montagnani

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