Definition(s)
TSSV
Testing surface safety valve.
Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global Standards
TSSV
Fail-closed surface-controlled safety valve placed near surface below the rotary (typically on land and jack-up operations) that performs a barrier function with pump-through and chemical injection capability.
Source:API SPECIFICATION 19TT, Specification for Downhole Well Test Tools and Related Equipment, First Edition, October 2016. Global Standards