Felix Wamers, CSCY@GSICERN-GSI Technical Coordination Meeting, 12 th -13 th of May 2015 1 CERN-GSI...

Felix Wamers, CSCY@GSI CERN-GSI Technical Coordination Meeting, 12th-13th of May 2015 1

CERN-GSI Technical Coordination Meeting

Felix Wamers, Yu Xiang, Holger Kollmus, and CSCY @ GSI

Result from a Design Studywith Cryotherm GmbHon the Cryo-Interface for SuperFRS-Magnet Testing at CERN

Mid-term meeting with and pre-final documents from F. Carovani and J. Singavarapu from Cryotherm GmbH on two technical solutionsfor the SFRS Cryoline-Cryostat Interconnection

* Introduction* Concepts of the Two Proposed Designs* Mechanical Aspects* Reaction Force Calculations (Cool-Down)* Safety Valves* Pressure Drop Calculations* Thermal Analysis (Heat In-leak)* Summary & Outlook


SFRS Cryo-Interface: Introduction

Situation: Hydraulics and mechanics of the cryo-magnet-interface need to be specified and communicated to CERN, so that they can

- design and tender their cryo feed boxes- design and tender their jumper connections Reminder: GSI-CERN Committee Meeting 05.12.2014 Deadline: Next Committee Meeting 26.06.2015

CSCY Action: Industry Design-Study on the SFRS Cryo-Interface

- 03.02.2015: Kickoff Meeting with Cryotherm- 25.02.2015: Offer from Cryotherm for Design Studies on

1) Jumper-Line, and 2) Feedbox- 20.03.2015: Order of item 1) by GSI

- 24.04.2015: Mid-term review: Cryotherm visit at GSI

- 13.05.2015: Delivery of design report and all documents


JumperLine: Goals for the Design Study

Goals for the external study at Cryotherm:Suggest a JL Design fulfilling the desiredmechanical, hydraulic, and thermal specs:

• +/-20 mm installation tolerance• minimize forces on cold mass and FB• keep heat in-leaks low enough• keep pressure drop (cool-down) low enough• coupling and dimensioning of the cryostat

(and shield-lines) safety valves


Cryotherm Design: General Concept

Open and Close Sliding Jackets for Cutting and Welding

Closed Open


Cryotherm Design: General Concept

Contents of Design Study:• Design of Jumper-Line as such until vacuum barrier

to feed box (similar to KIT, Fermilab)• Suggestion of two different options in terms of

alignment and shrinkage compensation via hoses• Concept for process lines and SV line in cryostat• Calculation/estimation of reaction forces onto cold

mass during cool-down and feedbox due to loss of vacuum

• Pressure drop and heat in-leak calculations• Sizing for LHe-vessel and shield-line safety valves

Open

Spacer


Cryotherm Design: Option 1Two bellow systems for installation tolerance (2x20mm)

Sliding jackets to access the process lines for welding

50 K shield moves within vacuum tube on wheels

He process lines are fixed transversally within spacers, but can slide longitudinally via ‘noses’ in spacers

Rigid spacers slabs (G10) can slide within shield on wheels

Flexible hoses on process lines compensate for vacuum bellowsand for thermal contraction

Flexible 90° hoses within knee take up thermal contraction

Vacuum barrier towards feedbox

Closed Jackets


Cryotherm Design: Option 2

One bellow system for installation tolerance (20 mm)- further away from magnet

Flexible hoses on process lines compensate for vacuum bellowand for thermal contraction

Closed Jackets

Shield piece flexibly connected via six thermal straps

Fixed vertical part of jumper line, fix-flanged to feed box


Cryotherm Design: Mechanical TolerancesOption 1: - Two pairs of bellows: 2 times +/- 20 mm- One 90 deg hose, two 0 deg hoses

Option 2:- One pair of bellows: 1 time +/- 20 mm- Two 0 deg hoses


Cryotherm Design: Reaction Forces

LHe vessel (cold mass):• Option 1: Zero (horizontal hoses)• Option 2: 721 N = (621(A)+43(B)+57(C)) N

Feed-Box (5 kN, insulation vacuum loss)• Option 1: no problem• Option 2: no problem

Cool-down shrinkage in dome (3.5 + 0.5 mm)

3.5 mm

0.5 mm

Safety Relief (11 kN, insulation vacuum loss)• 15 kg/s He mass flow (no MLI)

• Vacuum enclosure pipeline strong enough• No data from suppliers (Witzenmann) on

force compensation of hoses


Cryotherm Design: Safety Valve Concept • Central vertical relief line in

dome• Two flexible hoses for thermal

compensation• Relief line outside dome parallel

to floor, parallel to beam line if possible

• Actual calculation of reaction forces, e.g. during He blow-off, cannot be calculated by Cryotherm, since the hose producer, Witzenmann, does not provide the corresponding force-response data for the hoses when bending.


Cryotherm Design: Safety Valve SizingSV dimensioning according to AD 2000-A2

• LHe vessel: 6 kW/m2, 33 m2

mass flow at 20 K: 10 kg/s discharge diameter: 50 mm

mass flow from spec: 15 kg/s discharge diameter: 62 mm

• Shield line (80K): 0.5 kW/m2, 40 m2

mass flow at 100 K: 1 kg/s discharge diameter of 24

mm

Discharge Line (19 bar * 3% = 0.57 bar)• 15 kg/s: DN 125, ∆p = 173 mbar• 10 kg/s: DN 100, ∆p = 298 mbar


Cryotherm Design: ∆p (Cool-Down)

CERN specification:Max.: 5 barCurrent design value:1.3 bar (magnet) + 570 / 400 mbar (JL)

Option 1: ~ 570 mbar in addition to 1.3 bar Option 2: ~ 400 mbar in addition to 1.3 bar


Crytherm Design: ∆T, Heat In-Leak

Current design value:

• 22 W on shield (50 K), in total 1280 W for the whole SFRS (58 JLs)

• 1.0 W (+ G10 spacer contribution GSI) on LHe (4.5 K), in total 58 W + spacers for the whole SFRS

Heat Load at 80 K

Shield Material Heat Load at 4.5 K


Summary and OutlookSummary on the Jumper Connection Design

• Major Aspects of SFRS cryo jumper connection mechanical design done- process lines within jacket fixed via wheel-spacers (2 v, 2 h)- two vertical and two horizontal bellows for mechanical tolerances- one corresponding vertical and horizontal flex. hose on each process line to compensate for the external bellows internally- for each process line one 120 degree (15-90-15) flex hose in the 90

degree knee of the jumper the thermal contractions during cooldown

Outlook

• We will obtain the final documents (report, drawings, step files,...) this week.• We still can ask questions.

DO

NE

DO

NE

NE

XT

• Cryostat-internal piping design and safety valve connection.• Mechanical stress on cold mass due to cool-down and He-loss calculated.• Pressure loss calculations, thermal calculations, and safety valve sizing have

been done.• Cryotherm suggests to go for option 2.

Felix Wamers, CSCY@GSICERN-GSI Technical Coordination Meeting, 12 th -13 th of May 2015 1 CERN-GSI...

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Transcript of Felix Wamers, CSCY@GSICERN-GSI Technical Coordination Meeting, 12 th -13 th of May 2015 1 CERN-GSI...