The purpose of the IOGP S-730 specification documents is to define a minimum common set of requirements for the procurement of flanged steel pressure-relief valves in accordance with API Standard 526, Eighth Edition, August 2023, Flanged Steel Pressure-relief Valves for application in the petroleum and natural gas industries. The IOGP S-730 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