EN/CV SPS Tunnel visit for crab cavities
Minutes
Date:
6 January 2016
Location:
SPS LSS6
Participants:
W.Bannister, P.Pepinster, G.Vandoni
Summary of requests
COOLING
CRG
S.Claudet
RF
E.Montesinos
VENTILATION
RF
P.Baudrenghien
Warm compressor
RF powering
Raw
Demi
Faraday cup
?
Crab equipment zone
100kW Crab equipment zone
?
Crab equipment zone
8bar
Crab equipment zone
COMPRESSED AIR
CRG
S.Claudet
Valves
15
COOLING
CRG
S.Claudet
CRG
S.Claudet
RF
E.Montesinos
RF
E.Montesinos
VENTILATION
VSC
V.Baglin
Cold box
Gas heater
RF powering
RF powering
Raw
?
Demi
Demi
100 kW
0.5 kW
PA6 alcove
LSS6 QD617
LSS6 QD617
LSS6 QD617
10 kW
LSS6 QD617
8 bar
8 bar
8 bar
PA6 alcove
LSS6 QD617
LSS6 QD617
Vacuum pumps
COMPRESSED AIR
CRG
CRG
VSC
S.Claudet
S.Claudet
V.Baglin
Valves
Valves
Valves
15
15
11
Observations LSS6
DEMINERALIZED WATER : the branching off is available, already equipped with valves at the longitudinal
position of the helium pumps or blanked off at the longitudinal position of the crab-cavity cryomodule.
To install valves, it is necessary to empty the line in the sector, which is done as soon as magnets need
to be replaced. For instance, the line is empty now –the isolation valves on the blanked-off branches
may be installed now, in YETS (action).
COMPRESSED AIR: branching off is available at the level of the QD (see figure) and further downstream.
However, EN/CV will only provide a line closer to the final equipment: manifolds for distribution will
be installed by the end-users.
Compressed air is also needed at the cold box, where branching off is already available (nd equipped
with valves)
RAW WATER: This is needed for cryogenics, in two positions. At the crab-cavity cryomodule, a gas
heater may need a water heat exchanger, 5kW power. The raw piping is not used in this sector. In
order not to fill the whole line along the half arc, available sectorization may be used: one set of valves
close to TI12 and one set at the TA6 alcove (not easy to access for verification, see figure 1).
Figure 1
The two green valves on stainless steel pipe,
seen from below (tunnel ceiling)
At the PA6, behind the lifts, raw water is also needed for the cold box. Branching off is available at the
-5 level, where two DN100 Tees are equipped with blank flanges, which may be substituted by valves
(figure 2a). Easier, at the lower elbow of the two stainless steel lines, it should be possible to install
two Tees by welding: routing back to the cold box, the pipes would follow the existing ones (2b).
Fig.2a Raw water lines in the shaft, -5 level
Fig.2b Raw water lines in the TA6
Fig. 3 - Connection points for the coldbox on the raw water circuit in TA6.
Observations BA6
RAW WATER:
At top of PA6, the raw water circuit has been decommissioned, cut, and partly re-used as rejection
line of the sump (“puisard”, rising of clear waters of the BA). The circuit needs to be modified to
recover its initial function, while a new dedicated rejection pipe shall be added for the sump.
In BA6 cooling station, the raw water circuit needs to be reconnected to the SPS loop.
Raw water pipes to be reconnected
Reconnection point of raw Reconnection point of raw
water circuit on SPS loop water circuit on SPS loop
(supply)
(return)
Figure 4
DEMINERALIZED WATER : The existing manifolds were used to feed surface equipment, which has now
disappeared. The isolation valves are under the false floor. Seen the number of manifolds in the area
foreseen for the future crab cavity equipment (at least 3 manifolds) it will be easy to find an isolation
valve sufficiently close to the client equipment.
Figure 5: Demi water manifolds in BA6
Compressed air and ventilation requests will be easy to handle even during beam runs.