MNI3 JRA Sample Environment Meeting Rome, Italy
MNI3 JRA Sample Environment Meeting Rome, Italy High Pressure Task (STFC) 08.11.2011
Work out a joint approach to the Health & Safety aspects based on the Pressure Equipment Regulations (PED) Work in progress Inert Gas Cells (ISIS, STFC) Tasks: D21.15 Procurement 10 kbar automated gas handling system Completed Hydrogen Cells (ISIS, STFC) Tasks: D21.15 Sourcing, assembly and commissioning of 10 kbar H2 intensifier and gas handling system. Work in progress M21.2.2.1 Cell material and seal design review Completed D21.16 Report on material research: H2 and neutron compatibility . Completed M21.2.2.2 Design plan review for H2 gas pressure cell for 8 kbar at 4-300K Completed
D21.15 Procurement 10 kbar automated gas handling system The automated inert gas handling system specification: Operating from 0 to 10,000bar Transducer accuracy of 0.3% Full scale and pressure changes in steps of 40 bar This system is able to be controlled by instrument computer The system is released to ISIS User Program
D21.15 Sourcing, assembly and commissioning of 10 kbar H2 Intensifier and gas handling system Due to financial restraints the 10Kbar Hydrogen Intensifier is to be assembled and tested at ISIS by the Pressure & Furnace department. Components have been purchased and assembly work is in progress . High pressure hydrogen “red“ panel High pressure hydrogen stick
D21.15 Sourcing, assembly and commissioning of 10 kbar H2 Intensifier and gas handling system JRA 10Kbar Centre-Stick & H2 Valve JRA 10Kbar Centre-Stick Drawing Harwood C-4133 H2 10Kbar valve assembly on Centre-Stick
M21.2.2.1 Cell material and seal design review D21.16 Report on material research: H2 and neutron compatibility M21.2.2.2 Design plan review for H2 gas pressure cell for 8 kbar at 4-300K Specification To investigate the sample chamber seal design and material compatibility of a pressure vessel intended to operate up to 8000 bar with hydrogen gas on the ISIS neutron instruments. The working temperature will be from 300 K down to 4 K. The material of construction should be neutron compatible and able to retain the necessary strength to endure the enormous stresses likely to occur at the intended high pressures. Certain materials become brittle following exposure to hydrogen
M21.2.2.1 Cell material and seal design review JRA seal options Standard Bridgman seal MSE version Double Bridgman seal Tapered version LLB version
M21.2.2.1 Cell material and seal design review JRA seal options Double Bridgman seal prior to pressurisation. Typical Bridgman seal arrangement showing a three part seal assembly and the supporting backing nut. Double Bridgman seal after pressurisation
M21.2.2.1 Cell material and seal design review 10 kbar seal-test containment vessel Typical Bridgman seal arrangement showing a three part seal assembly and the supporting backing nut. Axial FEA results of the seal-test containment vessel.
M21.2.2.1 Cell material and seal design review JRA Bridgman seal test results Seal Configuration Room Temp Leak Tight at 2Kbar Room Temp Leak Tight at 10Kbar Liquid Nitrogen Leak Tight at 2Kbar Liquid Nitrogen Leak Test at 10Kbar Pb\Cu\Pb\Cu\Pb (Copper seals lead plated) 10 mins hold time 3hrs hold time Pressurised to 10Kbar in N2 3hrs hold time 9 9 10mins RT hold time then immersed in N2 10mins hold time 10 mins hold time Left over night hold time 9 9 Al\Cu\Al\Cu\Al (Copper seals lead plated) 9 9 10mins RT hold time then immersed in N2 10mins hold time (slight leak observed) Pressurised to 10Kbar in N2 (leak sealed) 3hrs hold time 9 Al\Cu\Al\Cu\Al (Copper seals not lead plated) Seals struggled to seal but finally sealed at 2Kbar 9 Seal remained leak tight until 7.6Kbar then failed and never resealed during attempt to obtain 10Kbar 8 Test not performed 8 9 Test not performed 8
M21.2.2.1 Cell material and seal design review D21.16 Report on material research: H2 and neutron compatibility Hydrogen compatible material tests Joint project with Imperial College, the University of London Hydrogen embritlement is a process where certain materials become brittle following exposure to hydrogen. High-strength steels, titanium alloys and aluminium alloys seem particularly vulnerable to this. 17-4PH tensile test sample 17-4PH tensile test sample
D21.16 Report on material research: H2 and neutron compatibility Fatigue results of various vessel materials
Axial FEA results of the seal-test containment vessel. M21.2.2.1 Cell material and seal design review. Seal Configuration. Room Temp Leak Tight at 2Kbar. Room Temp Leak Tight at 10Kbar: Liquid Nitrogen. Leak Tight at 2Kbar : Liquid Nitrogen Leak Test at 10Kbar. Pb\Cu\Pb\Cu\Pb (Copper seals . lead plated) 10 mins hold time. 9. 3hrs hold time. 9 .
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