AD 2000 and impact test 1

[JACKSTAN]

Following your knowledge and experience please tell me what do you think about following case:
- Pressure vessel is designed according to AD 2000 Merkblatt
- Materials are taken from AD 2000 (part. W4 for nozzles pipes);
- min. operating temperature TS is –29 degree of Celsius
Shall be or not material grade St35.8 acc. to DIN 17175 with determined impact test at 20 °C applied in temperature as above mentioned if stresses category will be changed from I to II thereby safety factor increased to 4/3 x 1.5)
Regards
Jack

 

[ijzer]

If all requirements of AD 2000 par. W10 for stress category II are met you can go to minus 60 Deg. C for St35.8

 

[JACKSTAN]

Hello IJzer,
So, in this case impact test is sufficient at 20 degree of Celsius or not? For me this is not too clear.
Jack

 

[ijzer]

Impact testing @ 20 Deg. C would only be required if wall thickness is over 30 mm. Thinner walls do not require impact testing.

 

[JACKSTAN]

Hello IJzer,
Many thanks for your information,
If you remember please tell me on which part of AD2000 I can find this information.
Regards
Jack

 

[ijzer]

According AD 2000 W10 , if stress cat II , you can use St35.8 DIN 17175 up to -60 °C without additional testing. DIN 17175 par. 8.4.4 requitres impact testing of St35.8 if tk is over 30 mm.