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Brand: Chromalox
Chromalox STFX Small Tank Flange Heater, 1-25 kW
Description
Replaceable-element flange heater for small storage tanks
The Chromalox STFX is a small-tank flange immersion heater whose elements can be changed without draining the tank. That suits smaller, critical storage units that must stay full, such as lube oil, fire water, water/glycol, diesel, fuel oil, asphalt, vegetable oil or other liquids named in the data sheet. Electric heat has no open flame and no steam or gas plumbing, and the units are described as quiet and easy to control.
Standard construction pairs 304 stainless steel element sheaths with a carbon steel ANSI 150 lb flange from 3 in to 12 in, a 24 in (610 mm) immersion length and a moisture resistant NEMA 4 / IP66 terminal housing. Each unit has a Type J thermocouple on the pipe wall for over-temperature sensing, and standardized heater cores keep spare elements to a minimum.
Technical specifications
| Parameter | Specification |
|---|---|
| Series | STFX small tank flange heater with replaceable elements |
| Sheath and flange | 304 stainless steel element sheath; carbon steel flange (304 or 316 stainless flange and 316 or Incoloy 800 sheath optional) |
| Flange size | 3 in to 12 in, ANSI 150 lb |
| Rating | 1…25 kW per unit; 240 V, 480 V or 600 V, three phase, single circuit (208, 380, 415 V and single phase also appear in the ordering matrix) |
| Immersion length | 24 in (610 mm) standard; customized lengths available |
| Watt density | 5, 10, 20 or 40 W/in2 (1, 1.6, 3.1 and 6.2 W/cm2) on the pipe surface |
| Terminal housing | Moisture resistant NEMA 4 / IP66 (code E4) or explosion / moisture resistant (E2); housings are CSA approved |
| Over-temperature sensing | Type J thermocouple on the pipe wall fitted as standard |
| Standards | Complies with API-614 for the applications described; ASME design and certification available; third-party certified |
| Typical media | Lube oil, fire water storage, water solutions, asphalt, water/glycol, diesel, acidic solutions, ethanol, biodiesel (B-100), glycerin, animal fats, vegetable oils, fuel oils |
| Matching controls | Power control assemblies SPCA-C1-75E4X (on/off, 484111-005) and SPCA-S1-75E4V (proportional, 484111-006), 480 V three phase; sensor kits PSKS-J4SS50-0001 and PSKS-RTD4SS200-0002 |
Standard models and watt density selection
The sheet lists stocked models in four watt-density groups: 40, 20, 10 and 5 W/in2. Chromalox recommends 40 W/in2 for water or water/glycol, 20 W/in2 for light oil and mildly corrosive solutions, 10 W/in2 for medium-weight oil and 5 W/in2 for heavy oil and severely corrosive solutions, and stresses that choosing the sheath material and watt density needs engineering judgement by the plant engineer. An extract of the 20 W/in2 group follows.
| Model (20 W/in2 group) | Volts | kW | Flange | Tubes | Heater part no. |
|---|---|---|---|---|---|
| STFXS-03-003P-E4 | 480 | 3.0 | 3 in 150# | 3 | 306608-011 |
| STFXS-06-006P-E4 | 480 | 6.0 | 4 in 150# | 6 | 306608-012 |
| STFXS-09-009P-E4 | 480 | 9.0 | 5 in 150# | 9 | 306608-013 |
| STFXS-12-012P-E4 | 480 | 12.0 | 6 in 150# | 12 | 306608-014 |
| STFXS-24-024P-E4 | 480 | 24.0 | 8 in 150# | 24 | 306608-015 |
| STFXS-24-025P-E4 | 600 | 25.0 | 8 in 150# | 24 | 306608-020 |
Ordering code and what to confirm
The model is built as STFX plus thermowell material (S 304, I Incoloy 800, X other), flange material (blank carbon steel, S 304 stainless, X other), number of thermowells 01 to 08, wattage in three digits, terminal housing (E4 or E2), voltage, circuits, phase and kilowatts. The sheet example is STFXSS-03-004P5-E4 480V 1-3P 4.5kW, and it notes that tube count, length, wattage and voltage are not a finite list and should match the design.
Confirm the fluid and its viscosity, tank flange rating and bolting, available nozzle size, voltage and phase, area classification for the terminal housing and the control method before ordering. Browse more heating equipment in HVAC and combustion.
Documents and quotation
The STFX model sheet with the full stocked-model tables is attached. Seven Star LLC, an independent supplier in Muscat, quotes from the complete model number; stock and lead time are confirmed at quotation.
Datasheets & Documents
- Datasheet Chromalox STFX Small Tank Flange Heater model sheet (catalog pages, English) Download
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About brand
Chromalox is an American manufacturer of electric process heating, heat trace and thermal control products. The company was founded in 1917 by Edwin L. Wiegand and, according to its website, is today part of Spirax Group. Its catalog spans immersion and circulation heaters, tubular and strip heaters, heat trace cables and controls, and temperature and power controllers.
Industrial heaters and heat trace
The industrial range covers screw plug and flanged immersion heaters, over-the-side heaters, air and radiant heaters, steam generators and packaged process heating systems. Heat trace products include constant wattage, self-regulating and mineral-insulated cables, with thermostats, controllers and connection kits for freeze protection and process temperature maintenance.
Controls and requesting a quote
Controllers run from single-loop temperature and process controllers to SCR power controllers and heat trace controllers. Seven Star LLC, an independent supplier in Muscat, lists selected Chromalox models for projects in Oman and the GCC. Send the full model code, voltage, kW or wattage and the fluid or application, and we will prepare a quotation from the Chromalox data sheet.
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Frequently Asked Questions
Can STFX elements be replaced without draining the tank?
Yes. The replaceable-element design lets one person change the heating elements without draining the tank and without special tooling.
What flange sizes and ratings are available?
Standard flanges are 3 in to 12 in, ANSI 150 lb, in carbon steel, with 304 or 316 stainless flanges as options.
Which watt densities does the STFX offer?
Stocked models use 5, 10, 20 or 40 W/in2, selected by fluid: higher values for water and lower values for heavy oil or severely corrosive liquids.
What over-temperature protection is fitted?
Each unit is equipped with a Type J thermocouple for over-temperature sensing on the pipe wall.
What terminal housings are offered?
A moisture resistant NEMA 4 / IP66 housing (code E4) as standard and an explosion / moisture resistant housing (E2) as an option.
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