Nelson Engineering Company (NEC) provides extensive engineering services for fluid systems. Our engineers have expertise in fluid mechanics and the physical and chemical properties of fluids. We have in-depth knowledge of industrial regulations and procedures governing fluid systems to help customers ensure the safety of their fluid systems. We specialize in inspections, analyses and designs of fluid systems such as:

Cryogenic Systems

  • Liquid Oxygen (LOX or LO2)
  • Liquid Hydrogen (LH2)
  • Liquid Nitrogen (LN2)

Hypergolic Systems

  • Hydrazine (N2H4)
  • Monomethyl Hydrazine (MMH)
  • Unsymmetrical Dimethylhydrazine (UDMH)
  • Nitrogen Tetroxide (N2O4)
  • Hybrid Hypergolic Fluids

Pneumatic Systems

  • Gaseous Oxygen (GOX or GO2)
  • Gaseous Hydrogen (GH2)
  • Gaseous Nitrogen (GN2)
  • Gaseous Helium (GHe)

Hydrocarbon Storage, Delivery and Processing Systems

  • Diesel Fuel
  • Propane
  • Natural Gas
  • Liquid Rocket Propellants

Our experience with fluid systems includes:

  • Performed a Process Hazard Analysis (PHA) on the LC-37 and LC-41 liquid hydrogen (LH2) systems for the United Launch Alliance (ULA) Delta IV and Atlas V programs to assure adequate controls are in place to prevent and minimize the consequences of a catastrophic release of hydrogen, a flammable or explosive chemical.
  • Performed an inspection of Spurlock Power Station’s gaseous hydrogen (GH2) facilities for East Kentucky Power Cooperative (EKPC). Assessed the physical condition of the GH2 system and its components. Performed sizing calculations and verified the adequacy of all relief devices. Calculated the reaction forces exerted on relief device assembly as a result of the sudden gas flow during operation of the device and recommended additional structural support to ensure the systems can withstand the forces in the worst case fire scenario.
  • Designed the extension of the existing high pressure gaseous nitrogen (GN2) and gaseous helium (GHe) cross country lines to the KSC Shuttle Landing Facility (SLF). The design required the understanding of the chemical properties of highly pressurized inert gasses. Performed sizing calculations and developed specifications for pipelines and piping components such as pressure relief valves (PRV).
  • Provided Systems Safety and Reliability Engineering for the Engineering Services Contract (ESC) at KSC for the design of Ground Support Equipment (GSE). Systems included hypergolic, cryogenic and pneumatic GSE. Our Systems Safety and Reliability engineers performed end-to-end safety analyses on designs of fluid systems and identified hazards and failure modes inherent to these systems. Using our experience and expertise in the design of inherently safe systems and the handling of hazardous fluids, we recommended hazard mitigations to design engineers for decreasing the risk of a catastrophic release or failure.
  • Performed a Property Condition Assessment (PCA) of industrial systems associated with NASA RPT active test facilities at five (5) major testing sites: Stennis Space Center (SSC), Marshall Space Flight Center (MSFC), White Sands Test Facility (WSTF), Glenn Research Center at Plum Brook Station (GRC-PBS) and West Palm Beach (WPB) E-6 facility. The scope of the assessments included propellant and pressurant systems, diffusers, vessels, small and large altitude simulation systems (SASS, LASS), high pressure industrial water (HPIW), high pressure gas and cryogenic facilities, and vacuum systems. We identified the current system status and deficiencies related to safety, system performance/efficiency and industrial code compliance.
  • Designed the Second-Stage Direct Hypergolic Propellant Loading System for the Boeing Delta II Launch Vehicle at Space Launch Complex 2W at Vandenberg Air Force Base (VAFB). The scope of the design encompassed the entire propellant loading system, associated propellant temperature conditioning systems and mobile hypergolic scrubbers. Performed a Hazard Analysis on the designed system, utilizing our expertise in the design of inherently safe hypergol systems and operation of hypergol systems, as well as associated environmental regulations.