The purpose of S-717 Noise Emitting Equipment (ISO) specification is to define a minimum common set of requirements for noise emitting equipment in accordance with ISO 15664 First Edition, 2001 Acoustics — Noise control design procedures for open plant for application in the petroleum and natural gas industries. The IOGP S-717 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.