1. SC1R Cold Box PDR Mechanical Design
SC1R Cold Box Preliminary Mechanical Design Review
S. Yang
Sunday, September 16, 2018

2. Outline SC1R 2K CBX Vessel - Overall Layout - Engineering Calculation
- Cold compressor nozzle assembly procedure
Internal Piping Layout
Equipment Layout
Platform Conceptual Design
Entry Floor Grating Extension
Interface Piping
Summary
SC1R PDR Mechanical Design

3. SC1R 2K CBX Vessel
SC1R PDR Mechanical Design

4. SC1R 2K CBX Vessel (contd)
CC3
CC4
CC2
CC5
CC1
SC1R PDR Mechanical Design

5. SC1R 2K CBX Vessel (contd)
Minimum Thickness of the Shell Calculation Under External Pressure per UG-28
Vessel - SA 516 Gr. 70
Dv - OD, in
126
Lv - design length, in
138
tdr - required minimum thickness, in
0.42
Lv / Dv
1.10
Dv/ tdr
300
Factor A
2.50E-04
Subpart 3, Section II, Part D
Factor B
3500
FIG. CS-2, Subpart 3, Section II, Part D
Pa = 4*B*tdr/(3*D)
Pa - calculated value of maximum allowable external pressure
15.6
YES
Torispherical Head Thickness Cal per UG-33
Torispherical Heads Thickness Cal - UG-33 Pressure on Convex Side - SA516 Gr. 70
UG-33 1a method
P - pressure
24.5
psi
UG-33 1a
E - joint efficiency 1
L - inside crown radius
126 in
S - allowable stress
2.00E+04
t - the minimum thickness (=0.885PL/(SE-0.1P)
0.0684
UG-32 e
UG-33 1e method
t - minimum thickness
0.230
A = 0.125/(R/t)
4.60E-04
Factor B
6.20E+03
Pa = 4*B*tdr/(3*D)
15.1
Pa - calculated value of maximum allowable external pressure
SC1R PDR Mechanical Design

6. SC1R 2K CBX Vessel (contd)
The minimum thickness of the nozzle on the bottom torispherical head cal - SA304/304L SS - UG-45
Dn - OD of opening , in
30.1
Ln - design length, in
120
tnr = ta
0.180
Ln / Dn
3.99
Dn / tnr
167
Factor A
1.40E-04
Subpart 3, Section II, Part D
Factor B NA
Pa = 2*A*E/(3*(Do/t)
For values of A falling to the left of the applicable material / temperature line
E - Modulus of elasticity, psi
2.80E+07
Pa - calculated value of maximum allowable external pressure
15.6
YES
tb1, in
UG-45
tb2, in
0.1
tb3, in
0.328
Table UG-45
tb, in
0.068
tug-45 - minimum wall thickness of nozzle necks, in
SC1R PDR Mechanical Design

7. SC1R 2K CBX Vessel (contd)
UG-37 Reinforcement area calculation - Bottom Head Opening
tr=
0.23
inches
trn=
0.18 F= 1
Sv=
20000
psi
Sn1=
fr1 =
Sn or Sp / Sv for nozzle wall inserted through the vessel wall
fr2 =
fr3 =
E1 =
0.7
joint efficienty obtained from Talbe UW-12 t=
0.5
specified torispherical wall thickness
30" nozzle opening
diameter of opening d=
30.00
wall thickness of nozzle tn=
0.31
required nozzle thickness trn= A=
3.45
UG-37 d(1)
A1 from 1st equation is:
3.60
A1 from 2nd equation is:
0.19
larger A1 from above two =
A2 from 1st equation is:
0.33
A2 from 2nd equation is:
0.21
smaller A2 from above two =
A3 from 2nd equation is:
0.49
Nozzle inward/outward weld size =
0.00
A41=
0.000
A1+A2+A3 +A41 =
4.29
A1+A2+A3 +A41 >A?
Yes
Reinforcement is NOT required.
SC1R PDR Mechanical Design

8. Cold Compressor Nozzle Assembly
On the bench, weld the CC casing mounting plate to the ¾” thick adapter ring by using 1/8” throat fillet weld
On the bench, weld the nozzle sleeve to the ¾ thk adapter ring by using full penetration weld
SC1R PDR Mechanical Design

9. Cold Compressor Nozzle Assembly (contd)
Place the top head weldment on a stand and be leveled.
Align the casing assembly to the top head. Tack weld first to make sure it is perfectly aligned then perform the full penetration weld to the thickness of the nozzle.
Will learn from the FRIB project about the generated moisture around the cold compressor. There are several options to handle the moisture depending on how much it will be.
SC1R PDR Mechanical Design

10. Internal Piping Overview
There are flow straighteners to CC2-CC5 inlet flow nozzles to remove circular flow. CC1 inlet is not required.
A circular pipe will be inserted into the bellows to prevent the pressure drop through bellows.
Piping flexibility and supports will be addressed at the FDR.
There is enough room to access to the critical components, such as TDs, and these components can be reached easily.
SC1R PDR Mechanical Design

11. Trunk – HX – CC1 Inlet
HX is supported by frame through four ½” OD thread rods.
The frame can be used to support the pipe if needed and to access critical components.
The heat load through four threaded rods is 1.7W. G10 spacers will be used to reduce the heat load.
4K Supply to LINAC
Bellows
HX Bypass CV
4K Supply to LINAC CV HX
4K Supply from 4K CBX
LN2 Return
Thermal Shield
LN2 Supply
2K Return from LINAC
Cryogenic transition joint provided by vendor
SC1R PDR Mechanical Design

12. Trunk – HX – CC1 Inlet
Threaded rods are strong enough to take the maximum thrust force of 6000 lbf from the bellows along with a delta pressure of 60 psi plus the weight of the HX.
Bellows is added between the HX and CC1 inlet nozzle to take care of the thermal contraction of the section between the mounting plate on the CC1 and the angle bar on the HX.
Bellows
½” OD thread rod
Inside sliding 8” pipe
SC1R PDR Mechanical Design

13. CC1 Outlet to CC5 Inlet Spools
CC2 Inlet – CC1 Outlet CC3 Inlet – CC2 Outlet CC3 Outlet – CC4 Inlet CC5 Inlet – CC4 Outlet
SC1R PDR Mechanical Design

14. CC5 Outlet Top View Isometric View First Discharge CV
Second Discharge CV
Bypass Tee
To Relief Valve
Thermal Relief
Top View
Isometric View
SC1R PDR Mechanical Design

15. Equipment Layout - Concept
North
SC1R PDR Mechanical Design

16. Equipment Layout – Concept (contd)
North
42” between the front of the cabinet and the conductive surface is required for 480VAC enclosure.
SC1R PDR Mechanical Design

17. SC1R Platform – Conceptual Design
SC1R PDR Overview

18. Entry Floor Grating Extension - Concept
SC1R PDR Mechanical Design

19. Interface Piping Guard Vacuum 3 ATM Supply Recovery Suction
SC1R PDR Mechanical Design

20. Summary
The vacuum vessel is preliminarily designed per ASME VIII Div. 1 and 2.
The overall dimensions of the new vessel don’t require big modification of the building for installation.
FEA will be performed according to the Part 5 DESIGN BY ANALYSIS REQUIREMENTS, ASME VIII Div. 2 for normal operation mode using commercial software ANSYS 17.2.
Internal piping is designed per ASME B31.3.
There is plenty room for access to the critical components.
Piping flexibility analysis will be performed using the commercial software Bentley AutoPIPE for both the transportation and operation modes.
The cold compressors can be taken out of the vessel from the top head.
Interface piping has been identified and tie-ins have been marked.
The platform and grating conceptual design are well developed.
SC1R PDR Mechanical Design

21. Thank You !
Sunday, September 16, 2018