The purpose of IOGP S-708 specification documents is to define a minimum common set of requirements for the procurement of subsea pipeline valves in accordance with API Specification 6DSS, Specification for Subsea Pipeline Valves, Third Edition, August 2017, including Addendum 1, April 2019 for application in the petroleum and natural gas industries. The IOGP S-708 specification documents follow a common structure comprising a specification, also known as a technical requirements specification (TRS), a procurement data sheet (PDS), an information requirements specification (IRS) and a quality requirements specification (QRS). These four specification documents, together with the purchase order, define the overall technical specification for procurement.