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CHF1
Fuel Oil Circulation Heater
- Standard Element Sheath Materials
- Incoloy® 800 — A Nickel (30 to 35%), Chromium (19 to 23%), Iron alloy. The high nickel content of this alloy contributes to its resistance to scaling and corrosion. Used in air heating (also see Incoloy® 840) and immersion heating of potable water and other liquids that are not corrosive to an Incoloy® 800 sheath.
- Low Carbon Steel — Applications include fluid heat transfer media, tar, high to low viscosity petroleum oils, asphalt, wax, molten salt, and other solutions not corrosive to a steel sheath.
- 316 Stainless Steel — A Chromium (16 to 18%), Nickel (11 to 14%), Iron Alloy with Molybdenum (2 to 3%) added to improve corrosion resistance in certain environments, especially those that would tend to cause pitting due to the presence of chlorides. Applications include deionized water.
Product Overview
- Cooling Type N/A
- Series ID CHF1
- Sheath Material Steel
Supported Applications
The Omega CHF1 Fuel Oil Circulation Heater series consists of self-contained heating units designed for optimum operating efficiency and performance. These circulation heaters provide trouble-free service with application flexibility, transferring heat generated by the elements immediately to the medium being processed with minimal losses.
Documented applications include:
- Fuel oils (Bunker C and Number 6)
- Air heating
- Immersion heating of potable water and other liquids not corrosive to an Incoloy® 800 sheath
- Fluid heat transfer media, tar, high to low viscosity petroleum oils, asphalt, wax, molten salt, and other solutions not corrosive to a steel sheath
- Deionized water
- Clean water heating for washrooms, showers, rinse tanks, and freeze protection of storage tanks
- Food industry applications, sterilizing solutions, and many organic and inorganic chemicals
Operating Conditions & Performance
The CHF1 series operates with a process temperature up to 399°C (750°F). The units are designed for an operating load of 8 watts/in² (1.3 watts/cm²) in typical applications such as fuel oils.
Electrical power supply options include 120V, 240V-1Ph, 240V-3Ph, 480V-1Ph, and 480V-3Ph. Flange heater elements are wired into branch circuits having a maximum current of 48 Amps; the number of circuits is listed next to the heater's voltage and phase in ordering tables.
Standard inlet-outlet connections on units from 76 to 203 mm (3 to 8") utilize NPT pipe threads, with flanges available as an option. Standard inlet-outlet connections on 254 mm (10") and larger units are 150 lb rated flanges made from forged steel with a raised face.
Selection Notes
- A thermostat is not a fail-safe device; use an approved high temperature limit control and/or pressure limit control for safe operation.
- Do not use the thermostat as a power switch. Use some other means of disconnecting power to the heater for servicing.
- For over-temperature protection, attach a thermocouple to one of the elements or mount it in a thermowell attached to an element.
Configuration Options
The CHF1 series offers extensive configuration options across nominal pipe sizes ranging from 3" (76 mm) through 14". The model number guide follows the format: CHF - Nominal Pipe Size - Number of Elements - Voltage - Phase - Number of Branch Circuits.
Housing and Enclosure Ratings
A general purpose (NEMA 1) terminal housing is standard. Optional enclosure ratings include:
- Moisture proof (NEMA 4)
- Explosion resistant (NEMA 7)
- Moisture/Explosion Resistant (NEMA 4/7)
The outer stainless steel sheet metal jacket protects the insulation from the environment and keeps it dry. An optional stainless steel outer jacket with a weather-tight seal is available.
Sheath Materials
Heating element sheaths are offered in:
- Incoloy® 800
- Low Carbon Steel
- 316 Stainless Steel
- Copper
- 304 Stainless Steel
- 321 Stainless Steel
- Incoloy® 840
- Incoloy® 825
Process Connections and Wetted Materials
Wetted materials include SA53B or SA106B steel, with stainless steel available as an option. Optional stainless steel flanges or 300 lb ratings are offered.
Options and Accessories
- Solid state temperature controllers and jacketed thermostats
- Double-pole non-indicating bulb and capillary type thermostat (optional feature)
- Custom supports
- Additional insulation or high temperature ceramic fiber insulation
- Stainless steel vessel
- Flow Control Baffles
- Terminal Housing Standoff Construction
Key Product Differences
The CHF1 series is available in nominal pipe sizes from 3" to 14", with specific configurations defined by the number of elements, voltage, phase, and branch circuits. Approximate weights vary significantly based on size and configuration, ranging from 17 lb (7.7 kg) for smaller units up to 941 lb (427 kg) for larger models.
Model numbers in the series reflect specific combinations of these parameters; for example, CHF01106 denotes a unit with specific element count and voltage/phase characteristics as detailed in the ordering tables. The number of branch circuits is indicated by a suffix or notation next to the model number in specification data.