witnessed joints..

[Kamaliya]

Люди добрые как правильно перевести witnessed joints в данном контексте

Witnessed joints
Bolted joints that have no means of isolation to allow leak testing, such as the last connection on an open flare line, should be regarded as a high risk joint and as such additional steps taken
PA (performing authority) should witness the assembly of the joint
PA should witness the controlled tightening of the joint.
Witness joints should be registered in the data management system.

[Верещагин]

как вариант: освидетельствованные соединения