SABRE Po P Fluid Handling Sabre General Meeting
SABRE Po. P Fluid Handling Sabre General Meeting – October 3, 2017 Antonio Di Ludovico
“Fluid” list • Scintillator ü Pseudocumene (PC) + 3 g/l PPO • Gas Nitrogen (GN 2) ü Regular grade GN 2 (RN) ü High purity GN 2 (HPN) • Exhaust gas • Water 1
Scintillator plant Borexino scintillator system SABRE Po. P part Informal agreement with BX Collaboration 2
Plants • Scintillator pipe lines from Borexino plant Hall C 3
SABRE Po. P Fluid handling: P&ID Veto pipe lines 4
Veto vessel filling/emptying line • Scintillator prepared in Borexino plant • PC+PPO stored in EPN tank • Filling • the SABRE vessel will be connected to the existing and extended BX line (previous CTF filling line) by a flexible hose (3/4 inch. ) • • a BX pump will be used for the SABRE vessel filling Emptying • the vessel will be connected by a flexible hose to the extended line (3/4 inch. ) • a new Sabre diaphragme pump has to be installed 5
Veto vessel expansion volume PC volumetric dilatation: 1. 2⋅10 -3 °C-1 PC density: 0. 8758 g/cm 3 • Installed to contain the pressure variations • Assuming to have a ~ 5 °C maximum variation expected scintillator variation V~ 10 liters • Vessel capacity ~ 30 liters • Stainless steel double walled vessel • Monitoring instruments control system slide • Vessel blanketing: ~ 5 mbar HPGN 2 6
SABRE Po. P Fluid handling: P&ID Regular N 2 pipe lines 7
Regular Gas Nitrogen (RN) Pipe Lines • Quality: Linde 5. 0 water content <5 (ppm vol) • Source: standard grade liquid nitrogen from Linde ü Connection to Bx pipe line (evaporated by BX Linde LN 2 tank) to be agreed ü Sabre line pipe line to be realized, LN 2 tank position to be assigned (LNGS) Two stainless steel lines: • ü Flushing Radon box (1/2 inch. ) 1 m 3/h ü Veto PMTs cans (1/4 inch. ) 10 l/h • Line pressure set by pressure regulator at about 10 mbar • Gas flow regulated by needle valves plus flow indicators • Pipes fittings: Swagelok type (maximum leak rate of 4 x 10 -7 mbar l /s) 8
SABRE Po. P Fluid handling: P&ID High Purity N 2 pipe lines 9
High Purity Gas Nitrogen (HPN) Pipe Lines • Quality: Linde 5. 0 • Low Radon 222 Rn concentration reduced by approximately a factor of 100 respect to the RN • Source: to be defined (BX pipe line or new one to be built) • Two stainless steel lines: Expansion vessel blanketing line (1/4 inch. ) ~ 10 liters/h Crystal Enclosure and Copper tube flushing line (1/4 inch. ) 20 liters/h • Lines pressure set by pressure regulator at about 5 mbar • Gas flow regulated by needle valves plus flow indicators • Pipes fittings: Swagelok or VCR type (maximum leak of 4 x 10 -9 or 4 x 10 -11 mbar l /s depending on the type used) 10
SABRE Po. P Fluid handling: P&ID Exhaust pipe line and charcoal system 11
Exhaust Line • Main pipe to collect and vent the waste nitrogen coming from: • Expansion Vessel blanketing • Radon box • PMT cans • Enclosure & Copper Tube • 1 inch. stainless steel pipe • Pipe fitting: Swagelok • Check valves installed to prevent back flow • Waste nitrogen threated through a charcoal system before the release into the car tunnel • Gas flow through the charcoal filter ensured by a blower 12
Water plant • Filling of shielding tanks: Temporary line with pvc hose pipe • Water needed: about 30 m 3 • Quality of water? ü deionized water from Borexino water plant ü Raw water from the underground water supply • Deionized water depending on the agreement with BX Collaboration • Drain: to be compliant with Environment Protocol to finally define • Temporary drain plant: pvc hose pipe, tank and diaphgram pump 13
Control systems instrumentation • Expansion vessel: • Radon Box ü Pressure transmitter ü LT level transmitter ü PC Vapor detector ü PT pressure transmitter ü Fluid detector catch ü PC Vapor detector basin ü Temperature trasmiter • Charcoal system ü PC Vapor detector • PMT cans flushing system ü PC Vapor detector 14
Safety system 15
Conclusions • The PI&D showed is the last one approved the LNGS (informally) • It could be modified in relation to the following open questions: ü Possibility to use the Borexino utilities (RN 2, HPN 2 and HPW) ü HPN 2 or RN 2 ü Maximum humidity value allowed for Crystal nitrogen flushing 16
Thank you! 17
- Slides: 18