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Акт освидетельствования скрытых работ stresses
construct.	Act of Inaccessible Works (S. Manyakin)
O&G	Hidden Works Inspection Certificate (Bemer)
акт освидетельствования скрытых работ
gen.	inaccessible hard-to-access, embedded installations inspection report (4uzhoj); Concealed Work Inspection Certificate (Alexander Demidov)
construct.	Concealed works acceptance act (освидетельствования – examination, inspection – но в этом случае принимающая сторона согласовывает скрытые работы. nurseit); hidden works acceptance certificate (Morning93); preconcealment inspection report (VLZ_58); inspection certificate for concealed work (VLZ_58); certificate of witness for concealed work (VLZ_58); certificate of witness for hidden work (VLZ_58)
O&G	act of hidden works (Johnny Bravo)
O&G, karach.	hidden work act (Leonid Dzhepko)
O&G, tengiz.	concealed work inspection report (e.g. "In accordance with current construction standards and rules in the USSR, concealed work must be inspected by the proper construction organization before being concealed by subsequent work." thefreedictionary.com Aiduza)
oil.proc.	Concealed Work Inspection Record (Yerkwantai)
product.	hidden works act (Yeldar Azanbayev)
акты освидетельствования скрытых работ
oil	acts of inspection of hidden work (Seregaboss)
Акт освидетельствования скрытых работ при монтаже оборудования и трубопроводов
gen.	Certificate of inspection of concealed work performed during installation of equipment and piping (snip.com ABelonogov)

Акт освидетельствования скрытых работ: 8 phrases in 2 subjects

Oil / petroleum	4
Oil and gas	4