Safety requirements are of paramount importance in the design and operation of a pilot plant, even more so than in a commercial facility. Since pioneering the business of modern pilot plants, Unitel’s partners have paid critical attention to the subject of safety. We have engineered and evolved the concept of multi-tier safety wherein each level is carefully configured to execute an independent safety function and/or cause the system to revert into an appropriately designated safety mode when any upset or out-of-bounds condition occurs.
System Design Philosophy: Our safety philosophy is based upon the assumption that the default condition of a system is one in which everything is working properly as planned. However, when a process unit begins to approach an undesirable condition, the appropriate safety action must be taken. This action is facilitated by an adequately designed and instrumented system.
The design philosophy of the multi-level safety system implemented by Unitel, that includes five (5) independent tiers of action, is enunciated below:
Tier 1: Low-High Alarms Wrapped Around Transducers
Tier 2: Low-Low and High-High Alarms
Tier 3: Hardwired Switches (Analog and Digital)
Tier 4: Emergency Palm Stop Switch
Tier 5: This level incorporates two kinds of mechanical devices into the safety system.
Mechanical Integrity: Safety in any process system is reliant on the design and fabrication of the pressure containing parts. Unitel utilizes the highest standards in the mechanical design and fabrication of our systems.
Where applicable the pressure vessels will be designed, built and tested in accordance with ASME BPVC Section VIII. All other vessels will be designed, built and tested in accordance with ANSI B31.3, Process Piping.
Process Hazard Analysis (PHA): We encourage all of our clients to undertake a process hazard analysis for the systems we design and build. Unitel requests to take an active part in participating in these analyses. The PHA is always conducted by a certified leader.
The PHA involves one of the analysis methodologies: What If, Checklist, What If/Checklist, FMEA, HAZOP, LOPA, Fault Tree Analysis, etc.