Oil Return; Tubing - GE Kelman TRANSFIX 1.6 Installation Manual

visible location. This valve can be used to conveniently shut off the oil supply, if
required.
8.2.2

Oil Return

 Oil is typically returned to a valve lower on the transformer, such as the
transformer drain valve.
Do not return the oil to a location that leads directly to a critical location within
the transformer, such as a cooling loop designed for directed cooling.
 Oil returning to the transformer must be via the 'Return Assembly' provided in the
product installation kit. This assembly incorporates a check valve, a ball valve and
a port that facilitates bleeding the system of air during the installation process.
The bleed port must be oriented up so that air can be drawn from it. The assembly
can be reconfigured to fit the transformer valve and adaptor, but must first be
adapted from a ¼ in. female NPT fitting.
 If the oil return valve is located more than 1.82 m (6 ft) above the base of the
transformer, it is recommended that an additional ¼ in. ball valve be placed in the
oil return line within easy reach while standing, and in an easily accessible and
visible location. This valve can be used to conveniently shut off the oil return, if
required.
 It is important to ensure that the configuration of the Return Assembly eliminates
any pre-existing air pockets. This is achieved by the use of a Tee on the return
valve with the bleed port facing upwards. To reduce the possibility of air pockets
behind the flange, the position of the ¼ in. NPT hole must be drilled near to the top
of the flange offset from the centre (see Figure 8—11).
Note: An optional manual oil sampling arrangement can be fitted to the oil inlet on the base of the
product. For more information, contact the GE Customer Service Centre.

8.3 Tubing

Stainless steel tubing is used to connect the product to the transformer. The amount of
tubing required is based on the location of the product in relation to the valves on the
transformer.
Stainless steel is the only material that should be used
tubing material would invalidate the results of the analysis and void the
warranty of the product. (See Appendix D for a full description of the tubing.)
It is also recommended that each section of tubing between the transformer and the
product be installed as one continuous piece, and to use as few fittings as possible to
reduce restriction and minimise the risk of oil leaks.
MA-001 – TRANSFIX-family Installation Manual – Rev 3.0
– the use of any other
18-Jan-16 Page 18 of 55