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When measuring the routes chosen for the tubing between the product and the
transformer oil supply and return valves – corners, bends and other obstacles may
add to the overall length and must therefore be taken in to consideration.
▪
The rigid tubing is typically supplied in 6 m (20 ft) lengths (see Appendix D). If the
length of either tubing path exceeds 6 m (20 ft), ¼ in. stainless steel compression
unions will need to be provided along with the additional tubing. The required amount
of tubing, in accordance with the specification in Appendix D, must be on site on the
day of the installation.
▪
Bending the rigid tubing is a complicated procedure and if there is a change to the
proposed route during the installation it could require extra tubing. For this reason, it
is advisable to order at least 20% more tubing than the initial required estimate.
▪
Flexible tubing is also available, but is more expensive than rigid tubing, and must be
ordered in custom lengths.
▪
If the supplied shut-off valves are mounted to transformer valves that are 1.82 m (6
ft) or more above the ground, an additional ¼ in. stainless steel compression ball
valve should be installed on the ¼ in. tubing at an easy to reach and visible location.
This valve should be located not more than 1.82 m (6 ft) above the ground. This will
facilitate turning off the oil flow, if needed, without having to climb to reach the valve.
One additional ¼ in. stainless steel compression ball valve is included in the product
installation kit.
If the oil temperature can fall below −10 °C, a heat trace may be fitted to the
oil pipe to increase the oil temperature before it enters the product.
heat trace shall need to be powered externally and be installed in accordance
with the manufacturer's instructions and local wiring regulations.
8.3.1 Fitting requirements
Figure 9-1 shows the bottom plate connection points. The stainless-steel tubing should
be fitted between the transformer and the product as follows, ensuring that
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The supply line is connected to the OIL IN port (this is the bulkhead fitting at the
bottom of the product that is located closest to the right-hand-side when viewed
from the front). This line will route to the transformer supply valve.
▪
The return line is connected to the OIL OUT port (this is the bulkhead fitting at the
bottom of the product that is located closest to the left-hand side when viewed from
the front). This line will route to the Return Assembly on the transformer valve.
▪
All stainless-steel tubing is clean and de-burred before attaching the tube fittings.
▪
All tubing is properly secured to the transformer or other suitable non-vibrating
structures.
▪
All tube fittings are sufficiently tight and tightened as per the fitting instructions
below (also outlined in the relevant Swagelok or Ham-Let documentation).
MA-005 - Minitrans Installation Manual - Rev 4.5
Note: The
13-Aug-20
Page 24 of 86
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