--- In email@example.com
> This is a brand new 1500W 120V hot water heating element. I did
> still run of just water to clean out my system. When I took the
> element out of the keg it had these black spots on it. They don't
> off or come off by scrubbing with a 3M pot scrubber. Anyone know
> it is? It goes into a SS keg with a welded bung for it to screw in
> which is also SS. I secure it with Teflon plumbers tape. In the
> keg I have a 220V 4500W element used to facilitate faster boil
> Both elements are new and have been in the exact same conditions
> the 4500W element looks normal. The 4500W package did say it was
> stainless steel while the 1500W did not. Any help would be
> Here is a pic.
It's fairly obvious the element is not up to the job. If it does
that with water, then it won't be much good with acidic wash and
ethanol. I'd get another one, stainless this time, or even better,
a copper sheath element. A bit of info...
Tubular Heaters (Formed or Straight)
The most versatile of all electric heating elements, the tubular
heater is capable of being formed into virtually any configuration.
The basic design consists of a helical coil of nickel-chromium
resistance wire precisely centered in a metal sheath. The coil is
surrounded by magnesium oxide powder which is vibration-loaded to
ensure even density throughout the length of the heater. This entire
assembly is then reduced to the finished diameter, compacting the
MgO and "freezing" the coil in the center of the heater. The range
of ratings, sizes, materials and terminations available makes the
tubular heater adaptable to many industrial, commercial and
Copper Sheath: Water heating, water solutions non-corrosive to
Stainless Sheath: Immersion in oils, molten salt baths, alkaline
cleaning solutions, tars and asphalt. Also suitable for clamping to
metal surfaces and casting into aluminum.
Stainless Steel Sheath: Corrosive liquids, food processing equipment.
Incoloy Sheath: Air heating, radiant heating, cleaning and
degreasing solutions, plating and pickling solutions, corrosive
Other sheath materials are also available for application
considerations. Commonly specified are 316 stainless steel, copper
clad steel for metal casting, Inconel for high temperature
applications, and titanium for severely corrosive solution heating.