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Screwplug Immersion Heaters
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STANDARD FEATURES
Applications
Screwplug Sizes & Materials
Watt Densities for Typical Applications
Sheath Materials
Thermostats
STANDARD FEATURES
- 1“, 1 1/4”, 2” and 2 1/2” NPT pipe plug in brass, steel or stainless steel
- .312” diameter element(s) on 1” and 1 1/4”; .430” diameter elements on 2” and 2 1/2”
- Copper, steel, 321 stainless steel, or Incoloy 800 sheath material
- High, medium and low watt densities for various processes
- General purpose or explosion and moisture resistant terminal enclosures
- Bends are repressed after forming to recompact MgO and extend element life
- Single and double pole thermostats in several temperature ranges
Applications
- Copper Sheath: Clean water, freeze protection, hot water storage, cooling towers, heating of solutions not corrosive to copper
- Stainless Steel Sheath: Process water, soap and detergent solutions, soluble cutting oils, demineralized or delonized water (passivation recommended)
- lncoloy Sheath: Solution water, corrosive solutions, steam super heating, air or gas
- Steel Sheath: Asphalt, wax, paraffi n, tar, etc., heat transfer medium, petroleum, degreasing and solvent oils, machine oil, fuel oils, alcohol
Screwplug Sizes & Materials
| Screw Plug Material | Information |
| Brass Screw Plug | Used for clean water and other non-corrosive materials |
| 304 SS Screw Plug | Used for corrosive materials |
| 316 SS Screw Plug | Used for corrosive materials |
| Steel Screw Plug | Used for oils and other non-corrosive materials |
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Watt Densities for Typical Applications
| Watt Density | Typical Application | Screwplug Material | Element Material |
| 8 watts/in2 (1.3 watts/cm2) | Fuel Oils (Bunker C and Number 6) | Steel | Steel |
| 15 watts/in2 (2.3 watts/cm2) | Medium Weight Oils ● Heat Transfer Oils | Steel | Steel |
| 16 watts/in2 (2.5 watts/cm2) | Medium Weight Oils ● Heat Transfer Oils ● Liquid Paraffin | 304 Stainless Steel | Incoloy® 800 |
| 23 watts/in2 (3.6 watts/cm2) | Forced Air & Gases ● Caustic Solutions ● Degreasing Solutions | 304 Stainless Steel | Incoloy® 800 |
| 23 watts/in2 (3.6 watts/cm2) | Lightweight Oils ● Degreasing Solutions ● Heat Transfer Oils | Steel | Steel |
| 48 watts/in2 (7.5 watts/cm2) | Process Water | 304 Stainless Steel | Incoloy® 800 |
| 60 watts/in2 (9.3 watts/cm2) | Clean Water | Brass | Copper |
| 60 watts/in2 (9.3 watts/cm2) | Deionized Water ● Demineralized Water | 316 Stainless Steel | 316 Stainless Steel |
Sheath Materials
| Sheath Material | Information |
| Incoloy 800 | Nickel 30-35%, Chromium 19-23%, Iron balance. The high nickel content of this alloy contributes to its resistance to scaling and corrosion. Used in air heating and immersion heating of potable water and other liquids. |
| 316/316L Stainless Steel | Chromium 16-18%, Nickel 11-14%, Iron balance. (316L – Low Carbon) Modified with the addition of Molybdenum (2-3%) to improve corrosion resistance in certain environments, especially those which would tend to cause pitting due to the presence of chlorides. Applications include deionized water. Maximum Sheath Temperature: 1200°F / 649°C |
| 304/304L Stainless Steel | Chromium 18-20%, Nickel 8-11%, Iron balance. (304L – Low Carbon) Used in the food industry, medical, and chemical heating. Maximum Sheath Temperature: 1200°F (649°C) |
| Copper | Standard Copper Alloy A low temperature, inexpensive material used mainly for clean water heating. Maximum Sheath Temperature: 350°F / 177°C |
| Steel | Low Carbon Used for high to low viscosity oils, asphalt, tar, wax, molten salt, heat transfer liquid media and other compatible solutions. |
Thermostats
| Type of Thermostat | Description |
| DPST Thermostat | Double Pole – Single Throw Thermostats |
| SPST Thermostat | Single Pole – Single Throw Thermostats |
| Adjustable Thermostat w/ Manual Reset High Limit | For single & 3 phase circuits. Adjustable Temperature Control w/ Manual Rset high limit |
