SOW.pdf

Statement of Work Background Xenon is used as the propellant for electric propulsion thrusters being fed into a cryo-pumped vacuum facility. This procurement is for the xenon to be used for qualification life testing of an electric propulsion thruster for a NASA Collaborative Opportunity. The vendor will provide 5500 L of high-purity, propulsion-grade xenon to NASA. The xenon will be provided in gas cylinders provided by the vendor that have valid certifications that last at least one year and have rare gas valves. The desired delivery date for the xenon is 45 to 60 Days after date of Award.

Specifications/Statement of Work The vendor will provide 5500 L of high-purity, propulsion-grade xenon to NASA. The xenon will be provided in gas cylinders provided by the vendor that have valid certifications that last at least one year and have rare gas valves. NASA requires xenon that is ultra-high purity, propulsion grade 99.999+ percent xenon. Xenon shall be delivered shall be delivered in 2 cylinders, one containing 5000 L and one containing 500 L.

The 5000 L quantity shall be delivered in Type 200 or Type K steel compressed gas cylinders that are rated for greater than 2000 psig internal pressure and meet or exceed DOT CFR 49 regulations. The bottles shall nominally be 9 inches in diameter and 51 inches tall, not including the cylinder valve, with approximately 44 L internal volume at 21 degrees Celsius and 1 atmosphere pressure.

The 500 L quantity shall be delivered in Type 35 or Type 007 or equivalent steel compressed gas cylinders that are rated for greater than 2000 psig internal pressure and meet or exceed DOT CFR 49 regulations. The bottles shall nominally be 7 inches in diameter and 19 inches tall, not including the cylinder valve, with approximately 7 to 8 L internal volume at 21 degrees Celsius and 1 atmosphere pressure.

Each bottle shall have a rare-gas valve with bellows seal to eliminate stem leakage and a CGA 580 valve fitting. The cylinders will be provided by the manufacturer and must have at least 1 year remaining prior to the required cylinder retest date. The vendor shall sell the cylinders to the government. Pricing for purchasing the cylinders shall be included in this order.

The measured xenon purity shall be greater than or equal to 99.999 percent and meet the requirements for impurities listed below by measuring the impurities in each individual bottle. The xenon impurity level requirements are: less than or equal to 0.1 ppm oxygen (O2), less than or equal to 0.1 ppm water (H2O), less than or equal to 0.5 ppm carbon monoxide (CO), less than or equal to 0.5 ppm carbon dioxide (CO2), less than or equal to 0.1 ppm carbon tetra-fluoride (CF4), less than or equal to 0.1 ppm total hydrocarbons (THC), less than or equal to 1 ppm nitrogen (N2), less than or equal to 2 ppm hydrogen (H2), less than or equal to 5 ppm krypton (Kr), less than or equal to 1 ppm argon (Ar), less than or equal to 10.4 ppm total impurities, and the remaining balance xenon.

A certificate of analysis is required for each cylinder to verify purity requirements. Lot impurities or measured impurities prior to any xenon transfer are not valid. Individual bottle certificates after xenon transfer is completed are required. Impurities for all constituents listed above shall be measured and shall be less than the maximum acceptable levels identified. The xenon impurity measurement accuracy shall be: less than or equal to 0.1 ppm oxygen (O2), less than or equal to 0.05 ppm water (H2O), less than or equal to 0.1 ppm carbon monoxide (CO), less than or equal to 0.1 ppm carbon dioxide (CO2), less than or equal to 0.1 ppm carbon tetra-fluoride (CF4), less than or equal to 0.1 ppm total hydrocarbons (THC), less than or equal to 0.1 ppm nitrogen (N2), less than or equal to 0.5 ppm hydrogen (H2), less than or equal to 0.1 ppm krypton (Kr), and less than or equal to 0.1 ppm argon (Ar).

Each delivered xenon bottle shall be analyzed for the impurities listed above. A certificate containing the amount of xenon in liters at standard temperature and pressure, the actual measured impurity values for that bottle, and measurement accuracy for each impurity must be provided with each bottle. The quantity of xenon ordered shall be the quantity after bottle analysis is completed.

Any bottle that fails to comply with the above requirements for measured impurity levels shall be rejected. Any bottle that does not have an accompanying certificate of measured impurity levels for that bottle shall be rejected. Any xenon bottle that does not comply with the minimum detection level and accuracy for impurity measurement as stated shall be rejected.

The government has the right to inspect any or all of the work included in this order at the supplier’s plant. A liter will be defined at standard temperature and pressure conditions of 32 degrees Fahrenheit and 29.92 inches of mercury.