When pressure vessel joining components contribute to the pressure resistance, their materials shall fulfil the relevant requirements of Annex I, section 4 of the PED.
Regarding section 4.3 of Annex I, a bolt is not considered to be a main pressure bearing part unless its failure would result in a sudden discharge of pressure energy.
Certificates required for bolting parts
When bolts are used as
- main pressure bearing parts: certificate of specific product control is required (unless the item of pressure equipment itself is in Category I)
- pressure bearing parts: test report is sufficient,
- non pressure bearing part: certificate of compliance is sufficient.
