A private energy developer with a high-pressure renewable natural gas (RNG) truck unloading facility installed in 2018 was receiving an increased volume of RNG from farms throughout Wisconsin. They needed assistance designing and constructing an expansion to their existing unloading facility to increase trailer unloading capacity. As the owner’s engineer in 2018, our team was familiar with the system and seamlessly transitioned to the EPC contractor for this expansion, leading the engineering, procurement, and construction (EPC) of the unloading (decanting) area. We designed and fabricated the RNG unloading equipment, including a glycol heating skid which is used to warm the RNG and an RNG valve skid. The system controls RNG flow, temperature, and pressure while monitoring BTU, H2S, H2O, O2, and CO2 content to verify pipeline-quality RNG and interconnect requirements. Additionally, we updated the control system, tied in new piping, erected an equipment building, and installed two truck bays for each station.
Key Project Aspects
67% increase in unloading capacity
3,600 psi RNG
975 psi utility pipeline