Upstream gas wellheads can experience extremely high pressure and surges. To protect personnel and equipment, wellhead casing pressure is often monitored in case there is a situation where the wellhead needs to be shut down. Traditionally simple pressure switches were used, but today companies are required to implement proper safety systems. In addition, upstream gas wellheads often reside in remote locations where access to electricity and harsh conditions propose significant challenges. Moore Industries SLA Safety Logic Solver and Alarm offers an effective and reliable solution for these applications due to its unique set of characteristics, which include exida® IEC61508 approvals, built-in voting logic, rugged housing, ability to run off 10.5-30Vdc power, and built to withstand ambient temperatures that have an operation range from -40 to 85 degrees Celsius.

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In the above gas wellhead application, three separate smart HART pressure transmitters are wired to the SLA (HART data from the pressure transmitters can also be passed thru to the SLA’s three optional analog outputs when required). With its built-in voting logic capability, the SLA performs a 2oo3 safety voting architecture to shut down the well when dangerous conditions exist. The SLA’s built in loop power supply on each of its three channels provides operating power to all three pressure transmitters. The SLA has up to four digital I/O channels that can be configured as inputs or outputs. In this application,n one of the digital inputs is configured to reset the latching ESD Valve relay output but could be utilized to reset any of the SLA’s 16 internal alarms or other SLA relay outputs. Finally, due to the remote nature of this application, the SLA is powered by 10.5-30Vdc generated through a remote solar power system.

Key attributes:

• SIL 2/3 capable exida® approved to IEC 61508:2010 standard
• Requires only one instrument for voting applications with built-in voting logic capability
• Meets 10.5-30Vdc power requirement for solar or battery backup systems
• -40 to 85 degrees Celsius ambient temperature operating range
• Rugged aluminum casing which helps dissipate heat and provides protection against radio frequency and electromagnetic noise in harsh environments.

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