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7.3
Connecting Pipes to the Top of the XDO
To connect the pipes:
1. Vent the nitrogen holding charge as specified in 7.5 - Holding Charge.
2. Remove the caps from the supply and return pipes—the caps are soldered in place and can be
removed with a small torch.
3. Connect the supply and return pipes, soldering or brazing them in place. Before brazing the pipes,
refer to 7.6 - Brazing Preparations.
7.4
Connecting Pipes Through the Side or Front of the XDO
To connect the pipes:
1. Vent the nitrogen holding charge as specified in 7.5 - Holding Charge.
2. Remove the caps from the supply and return pipes—the caps are soldered in place and can be
removed with a small torch. Be careful to not damage internal components when making internal
piping connections.
3. Remove the top panel; it is held in place with screws.
4. Cut the supply and return pipes to the proper length, permitting pipe connections with the panel
replaced.
5. Remove the knockouts on the side or front panel where pipes will enter the XDO.
6. Bring the supply and return pipes into the XDO, soldering or brazing them in place. Before
brazing the pipes, refer to 7.6 - Brazing Preparations.
7. Replace the top panel.
7.5
Holding Charge
The XDO is shipped with a low-pressure holding charge of nitrogen. This must be vented before
removing the caps on the ends of the supply and return piping.
To vent the holding charge:
1. Find the Schrader valve on the top exterior of the cabinet, which will allow you to vent the
nitrogen holding charge in the XDO unit, as shown in Figure 23.
2. Open the valve and vent the holding charge.
3. Replace and secure the cap on the Schrader valve.
7.6
Brazing Preparations
Brazing material or soft solder may be used to connect supply and return pipes. However, if brazing
material is used, the lines being brazed must be pressurized with flowing dry nitrogen during brazing
to prevent oxidation and scale formation inside the piping.
After the holding charge has been vented, a torch can be used to remove the caps over the ends of the
supply and return lines.
7.7
Recommended Piping Size
Connect the main pipes between the XDO branch piping and the XDP or XDC according to Table 3.
Elbows and restrictions must be minimized to get good fluid flow.
Connect the branch pipes between the main piping and the XDO according to Table 3.
Table 3
Branch piping
Nominal Pipe
Size, in.
1/2 O.D.
Supply
7/8 O.D.
7/8 O.D.
Return
1-1/8 O.D.
Equivalent Length
ft. (m)
up to 10 (3)
longer than 10 but less than 25 (3-7.6)
up to 10 (3)
longer than 10 but less than 25 (3-7.6)
25
Piping Connections and Piping Access Points
Pipe Material
Copper
Copper
Copper
Copper
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