Recommended Hose Installation
Flexible hose must be used to connect each Rotary Union to its supply or drain piping. Use braided metal hose for all applications involving hot fluids, such as, hot water, hot oil or steam. Use two-ply rubber hose for cooling water, refrigerants, air and vacuum service.
Allow for an offset between the Rotary Union joint and the rigid pipe as shown in Exhibit C. It is important to allow a slight curve in the house to allow the hose to "float". This will prevent a side load from being placed on the Rotary Union. A side load will greatly reduce the life of the Rotary Union.
A straight hose, when fully charged, becomes rigid as solid pip. This rigidity, plus the added weight of the fluid media and expansion due to temperature, can drastically shorten the service life of the Rotary Union.
Example of the correct way to install flexible hose on a