Views: 0 Author: Site Editor Publish Time: 2026-11-03 Origin: Site
At CSTHEATEXCHANGER, we design and manufacture custom-engineered Stainless Steel Immersion Coils and Submerged Heat Exchangers specifically tailored for direct tank immersion heating and cooling of water, thermal oil, hydraulic fluids, chemical plating baths, fermentation wort, beverage liquids, and industrial CIP tanks (thermal transfer ratings engineered from 5 kW to over 850 kW, operating across media temperatures from −20∘C up to +350∘C and design operating pressures up to 3.0 MPa / 30 bar). Fabricated from seamless heavy-wall AISI 304/304L, AISI 316L (molybdenum-enhanced for chloride resistance), 254SMO, Duplex 2205, or Grade 2 Titanium, our immersion coils are available in continuous helical spiral coils, pancake bottom coils, drop-in hairpin/bayonet bundles, and multi-tier grid box configurations. Utilizing steam, pressurized hot water, thermal oil, or sub-zero glycol as the internal utility medium, CSTHEATEXCHANGER provides direct, unobstructed heat transfer with zero external pump loop fouling, complete tank geometry adaptation, and long-term acid/chemical corrosion resistance.
Direct submerged immersion coils eliminate the capital cost, floor footprint, and seal maintenance associated with external circulation pumps, skid piping, and plate heat exchangers:
TANK IMMERSION HEATING & COOLING THERMAL CONVECTION PATTERN
======================= PROCESS TANK LIQUID (WATER / OIL / CHEMICAL) =======================
┌────────────────────────────────────────────────────────────────────────────────────────┐
│ │
│ ▲ [NATURAL THERMAL BUOYANCY PLUME] ▲ [WARM FLUID RISES UPWARD] │
│ │ (Hot liquid ascends along tank walls) │ │
│ │ │ │
│ ┌──┴────────────────────────────────────────────────┴──┐ │
│ │ [CST SEAMLESS STAINLESS STEEL HELICAL COIL BUNDLE] │ │
│ │ • Internal Steam / Thermal Oil / Hot Water / Glycol │ │
│ │ • Seamless continuous bending eliminates leak joints │ │
│ │ • Electropolished sanitary surface resists scale │ │
│ └──┬────────────────────────────────────────────────┬──┘ │
│ │ │ │
│ ▼ [COOLED / HEATED DENSE FLUID SINKS] ▼ [INDUCED NATURAL CONVECTION] │
│ │
└────────────────────────────────────────────────────────────────────────────────────────┘================================================================================
CST DIRECT TANK IMMERSION COIL VS. EXTERNAL PUMP-AROUND HEAT EXCHANGER SKIDS
================================================================================
Evaluation Metric CST Direct Immersion Tank Coil External Pump + Plate/Shell Exchanger
--------------------------------------------------------------------------------
Equipment Footprint 0 m² Floor Footprint (Inside Tank)Requires 4–10 m² External Floor Skid
Circulation Pump Requirement Zero Pump Required (Natural Buoyancy)High-Power Slurry / Chemical Pump
Pump Seal Leakage & MaintenanceZero Pump Seal Failure Risk Frequent mechanical seal replacements
Clogging in Viscous / Dirty OilZero Clogging (Wide open spacing)Narrow plate channels plug rapidly
Chemical / Acid Slurry Defense Direct Metallurgy (SS316L/Titanium)Risk of gasket swelling/dissolution
Installation Complexity Drop-in directly into tank openingExtensive external suction/discharge pipe
Thermal Expansion Response Continuous spiral flexes freely Rigid pipe manifolds crack under stress
Initial Investment Capital Cost-Effective, Direct FabricationHigh Initial Capital (Pumps + Valves)
================================================================================External heat exchangers require dedicated floor space, heavy suction/discharge piping, and continuous pump power. CST immersion coils utilize the tank's natural thermal convection currents (buoyancy-driven circulation), transferring heat directly into the liquid bath with zero external pump power, zero floor footprint, and zero pump seal leaks.
Unlike plate heat exchangers limited by elastomer gasket temperature limits (+140∘C+140∘C), our all-welded stainless immersion coils handle high-pressure saturated steam (1.6 MPa), superheated thermal fluid up to +350∘C, or cryogenic cooling glycols with absolute joint integrity.
Tank chemicals, industrial oils, and sanitary wash solutions demand precise metallurgical selection:
CST IMMERSION COIL METALLURGICAL MATRIX
┌─────────────────────────────────────────────────────────────────────────┐
│ [1. AISI 304 / 304L STAINLESS STEEL] │
│ • Ideal for clean hot water heating, beer brewing, food CIP wash tanks. │
│ • Cost-effective, high tensile strength, and sanitary surface finish. │
├─────────────────────────────────────────────────────────────────────────┤
│ [2. AISI 316L (MOLYBDENUM-ENHANCED STAINLESS STEEL)] │
│ • Molybdenum addition resists chloride pitting, salt brine, & fatty oils│
│ • Ultra-low carbon prevents intergranular corrosion along weld HAZ. │
├─────────────────────────────────────────────────────────────────────────┤
│ [3. GRADE 2 TITANIUM / DUPLEX 2205 / 254SMO SUPER-ALLOYS] │
│ • 100% immune to aggressive electroplating acids (chromic, sulfuric). │
│ • Ultimate resistance to marine seawater and high-chloride brines. │
└─────────────────────────────────────────────────────────────────────────┘ CST FULL CONTINUOUS BEND & ORBITAL TIG INTEGRATION
FROM UTILITY SUPPLY (STEAM / THERMAL OIL / HOT WATER / GLYCOL)
┌─────────────────────────────────────────────────────────────────────────┐
│ [ STAGE 1: CNC AUTOMATED MANDREL ROTARY DRAW BENDING ] │
│ Precision continuous pitch prevents tube ovality & wall thinning │
├─────────────────────────────────────────────────────────────────────────┤
│ [ STAGE 2: CLEANROOM ORBITAL TIG WELDING & PASSIVATION ] │
│ Full penetration welds with inert gas purge; 100% acid pickling/passivat│
└─────────────────────────────────────────────────────────────────────────┘
100% PRESSURE TESTED UP TO 4.5 MPa (45 BAR) WITH HELIUM VACUUM QUALITY GATESubmerged weld seams inside chemical tanks are the most vulnerable point for stress corrosion cracking. CST bends its helical coils using automated CNC rotary draw mandrels from continuous seamless pipe lengths, ensuring zero submerged weld seams inside the liquid bath for maximum service life.
For sanitary food, beverage, and pharmaceutical tanks, coils undergo immersion pickling, chemical passivation, and mechanical or electropolishing down to Ra≤0.4 μm, eliminating microscopic crevices to prevent scale formation and bacterial harborage.
CSTHEATEXCHANGER IMMERSION COIL GEOMETRIES
[1. VERTICAL HELICAL CYLINDRICAL COILS]
• Positioned along the inside perimeter of cylindrical tanks, leaving central agitator space clear.
• Ideal for wine fermentation, chemical reaction vessels, and water storage tanks.
─────────────────────────────────────────────────────────────────────────────
[2. PANCAKE (FLAT SPIRAL) BOTTOM COILS]
• Sits horizontally along the tank floor for maximum low-level liquid heating and sludge boiling.
• Ideal for shallow oil sumps, degreasing baths, and asphalt/bitumen heating tanks.
─────────────────────────────────────────────────────────────────────────────
[3. MULTI-TIER RECTANGULAR GRID & BAYONET DROP-IN BUNDLES]
• Drop-in multi-tube bank designed for square industrial wash tanks, anodizing, and quench baths.(Note: The following engineering parameters represent standard manufacturing design envelopes. Tube diameter, coil diameter, pitch, metallurgy, and mounting brackets are 100% custom-engineered to match specific tank geometry and process thermal loads.)
================================================================================
CSTHEATEXCHANGER STAINLESS IMMERSION COIL (CST-IMM-COIL SERIES)
================================================================================
Engineering Parameter Standard Manufacturing & Design Range
--------------------------------------------------------------------------------
Thermal Transfer Capacity Range 5 kW to 850+ kW (17,000 to 2,900,000+ BTU/h)
Process Liquid Media Inside TankWater, Thermal Oil, Hydraulic Fluids, Plating Acids, CIP
Internal Heating/Cooling Media Saturated Steam, Thermal Fluid, Hot Water, Glycol, R744
Operating Temperature Range -20°C to +350°C (-4°F to +662°F) Wide Operating Window
Design Operating Pressure Range Up to 3.0 MPa (30 bar / 435 psi) High-Pressure Steam
Hydrostatic Proof Test Pressure 4.5 MPa (45 bar / 652 psi) Leak Integrity Gate
Base Metallurgy Options AISI 304, AISI 304L, AISI 316L, 254SMO, Duplex 2205, Titanium
Tube Outside Diameter (OD) 1/2" (12.7 mm), 3/4" (19.05 mm), 1" (25.4 mm), up to 2" (50.8 mm)
Tube Wall Thickness Range 1.0 mm to 3.5 mm Heavy Wall (Seamless or Welded ASTM A249/A269)
Coil Formats & Topologies Vertical Helical Spiral, Flat Pancake, Rectangular Grid, Bayonet
Coil Diameter & Height Limits Coil Diameters up to 3,500 mm; Heights up to 6,000 mm
Tube Bending Technology CNC Precision Rotary Draw Mandrel (Ovality < 5%, No Wrinkles)
Surface Finishing Options Mill Finish, Acid Pickled & Passivated, Electropolished (Ra < 0.4 µm)
Inlet & Outlet Connections Flanged (ANSI/DIN/JIS), Tri-Clamp Sanitary Ferrule, BSPT/NPT
Mounting & Structural Supports Integrated Heavy Stainless Mounting Legs, Hanging Hooks, Spacers
Quality Standards & Compliance ASME Section VIII Div. 1, CE / PED 2014/68/EU, 3-A Sanitary
Testing & Quality Assurance 100% Hydrostatic Proof Testing + Helium Mass Spectrometer Testing
================================================================================An immersion coil sits directly inside the tank, eliminating external circulation pumps, external piping, and floor space requirements. It removes the primary cause of downtime in viscous oil or dirty chemical applications—clogged plate heat exchanger channels and leaking pump mechanical seals.
Submerged weld seams inside hot, corrosive chemical or oil baths are highly susceptible to stress corrosion cracking and crevice corrosion. CSTHEATEXCHANGER bends immersion coils from continuous seamless pipe lengths using CNC rotary mandrels, ensuring zero submerged weld joints inside the liquid bath.
Yes. We custom-engineer helical coils with exact coil inside/outside diameters, calculated pitch spacing, and rigid standoff mounting brackets that leave ample clearance for central top-entry agitators, mixer blades, and tank level sensors.
Maximize tank thermal efficiency, eliminate pump maintenance, and guarantee chemical longevity with CSTHEATEXCHANGER:
Custom Stainless Steel Immersion Coils (5 kW to 850 kW+)
AISI 304, AISI 316L, Duplex 2205, and Grade 2 Titanium Metallurgy
Continuous CNC Helical Spirals, Pancake Bottom Coils, and Drop-In Grid Banks
Seamless Tube Bending with Zero Submerged Welds for Maximum Chemical Longevity
High-Pressure Steam (30 bar) & High-Temp Thermal Oil (+350∘C) Rated
Full ASME / CE PED Compliance, 100% Helium Leak Tested & Factory-Direct Global Delivery
Contact our specialized industrial liquid heating and cooling engineering team today with your tank dimensions, liquid volume (m3), heating/cooling media, and target temperature profile for custom 2D/3D CAD proposals and factory-direct quotations.
Website: https://www.cstheatexchanger.com/
Technical Inquiries: info@cstheatexchanger.com
