GE Kelman TRANSFIX 1.6 Installation Manual

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MA-001 – TRANSFIX-family Installation Manual – Rev 3.0 18-Jan-16 Page 41 of 55D.5 6 mm Tubing AdaptorsIf ¼ in. tubing is not available, 6 mm stainless steel tubing may be used, but themaximum tubing run may be reduced, and ¼ in. to 6 mm tubing adaptors must be used.Consult with the GE Customer Service Centre. The adaptors should be Swagelok (SS-6M0-R-4 Stainless Reducer, 6 mm OD – ¼ in. OD) or Ham-Let (767LT SS Stainless Reducer, 6mm OD – ¼ in. OD). At least eight of these are required for the installation.Do not use 6 mm tubing without the above adaptors. To do so would void thewarranty.D.6 Tubing MaterialStainless steel is the only material that should be used. The use of any othertubing material will cause reliability issues or inaccurate results and void thewarranty of the product. GE does not support the use of copper tubing for theinstallation of its transformer analysis products. The reasons for this areoutlined below.D.6.1 Flow RateThe solid seamless stainless steel tubing that GE specifies is 316 Stainless Steel, 1/4 in. ODwith a 0.035 in. thick wall. Most 1/4 in. copper tubing has a greater wall thickness whichreduces the flow rate rendering it too fragile to place in the field. Bends in standard softcopper tubing crush and deform more easily, which can reduce the flow rate than wouldotherwise be the case with properly bent stainless steel tubing.D.6.2 Connection reliability and physical damageGE has two overriding primary design and installation principles:Never let oil out of the customer's transformer during operation.Never let air into the customer's transformer during operation.Copper tubing, in general, is too soft to create a reliable long term seal at the connectionsin the vibratory environment of a transformer; the connections will eventually leak. Thesoftness of copper tubing also make it prone to damage after the installation; it caneasily get kinked, pinched and even torn from the connection by maintenance andservice activities near the transformer.