The purpose of the IOGP S-702 specification documents is to define a minimum common set of requirements for the procurement of DC uninterruptible power systems (UPSs) in accordance with IEC 62040-5-3, Edition 1.0, 2016-10, uninterruptible power systems (UPS) – Part 5-3: DC Output UPS – Performance and test requirements, for application in the petroleum and natural gas industries The IOGP S-702 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.