The evolution of the High Integrity Pressure Protection System (HIPPS) has radically reduced the need for traditional mechanical relief devices and the level of flaring in oil and gas applications.
The connection of new gas production sources to a gas plant facility has often required mechanical relief devices for the protection of gas production facilities or pipelines. New production sources connected to existing pipelines require the pipeline to be protected against potential overpressure, which may result in the release of hydrocarbons to the atmosphere or undesirable burning of these hydrocarbons via a flare system. International standards (API 521, Code Case 2211 of the ASME Section VIII, Division I and 2, ANSI/ISA 84.01-2004, IEC 61511) are now in place to allow for the application of high-reliability safety instrumented systems to replace traditional mechanical relief devices and to remove the need for flaring.
ValvTechnologies’ scope of supply would typically include Shutdown valves (SDV) API, PSL level 3 (with optional flame protection), utilizing ValvTechnologies’ zero-leakage ball valves; Actuators (hydraulic or pneumatic); Instrumentation, including pressure transmitters; HIPPS logic solver; Chemical injections system; Choke control and Complete HIPPS skid design and fabrication, if required.
HIPPS solutions utilize the ValvTechnologies’ NexTech® E, trunnion mounted, double block and bleed ball valves that are suitable for both the API and ANSI codes. NexTech® E offers an innovative solution: One-piece top entry body; Bi-directional seat tightness; Controlled seat loading; Lower torque; Resistant to particulates; In-line serviceable; and Double block and bleed.
The development of the HIPPS package is governed by IEC 61508 / 61511 which defines specific guidelines to configure the SIS to provide the necessary risk reduction and meet the required Safety Integrity Level (SIL).
The Logic Solver uses standard, proven function block software and available options which include partial stroke testing, valve function logging (to support preventative maintenance regimes), communications to all major DCS systems and customized third party communication interfaces. The SIS controller can be provided from a range of IEC 61508 SIL 3 certified platforms, to include scalable 2oo3, 1oo2D, and simplex architectures, with SIS choice dictated by functionality and availability requirements, system cost and customer preference.
