IBM XIV Gen3 Series Planning Manual page 106

materials that are compatible with the pump unit and related piping (see "Water
specifications for the secondary cooling loop" on page 74). The manifolds must
provide enough connection points to allow a matching number of supply and
return lines to be attached, and the manifolds must match the capacity rating of
the pumps and the loop heat exchanger (between the secondary cooling loop and
the building chilled-water source). Anchor or restrain all manifolds to provide the
required support to avoid movement when quick-connect couplings are connected
to the manifolds.
Manifold supply pipe sizes
v Use a 50.8 mm (2 in.) supply pipe to provide the correct flow to six 19 mm (0.75
v Use a 63.5 mm (2.50 in.) supply pipe to provide the correct flow to eight 19 mm
v Use an 88.9 mm (3.50 in.) supply pipe to provide the correct flow to twenty 19
Use shutoff valves for each supply line that exits the manifold to enable the flow
of water to be stopped in individual legs of multiple-circuit loops. The shutoff
valves provide a way of servicing or replacing an individual heat exchanger
without affecting the operation of other heat exchangers in the loop.
Use adjustable flow control valves, called circuit setters, on each supply line to
enable control of the flow and compliance with specifications for each heat
exchanger.
Use temperature and flow metering (monitoring) in secondary loops to provide
assurance that water specifications are being met and that the optimum heat
removal is taking place.
Use circuit setters, placed as shown in Figure 25 on page 83 and Figure 26 on page
83, to enable the adjustment of water flow to each water circuit off a main
manifold system.
Anchor or restrain all manifolds and pipes to provide the required support and to
avoid movement when quick-connect couplings are being attached to the
manifolds.
Figure 25 on page 83 shows a layout for multiple water circuits.
82
IBM XIV Gen3 281x-11x, 281x-21x, and 281x-314 Planning Guide
in.) supply hoses, with a 100 kW cooling distribution unit.
(0.75 in.) supply hoses, with a 120 kW CDU.
mm (0.75 in.) supply hoses, with a 300 kW CDU.