Custom Coil Design Inputs

Start with the installation envelope

Provide the tank or vessel inside dimensions, access opening and any internal obstructions. Indicate whether the connections must enter from the top, side or base.

• Available diameter or width
• Maximum coil height
• Installation opening
• Connection direction and clearance

Define the tube and coil geometry

State tube material, outside diameter and wall. Add coil diameter, number of circuits, pitch, straight-leg lengths, bend radii and dimensional tolerances where controlled.

• Tube OD, wall and material
• Coil diameter and height
• Pitch and number of turns
• Single or dual circuit

Provide the service conditions

Identify the internal working medium and the tank-side medium, along with operating temperature, pressure and the heating or cooling objective.

• Working media
• Temperature range
• Operating and design pressure
• Required duty when available

Specify ends, supports and inspection

Connection ends, mounting details, supports, surface condition, cleaning and testing should be shown on the drawing or listed in the RFQ.

• Threaded, plain or project-specific ends
• Supports or mounting plate
• Cleaning and surface requirements
• Inspection and quantity

Review material compatibility before fixing the grade

A material name by itself is not a compatibility decision. Identify the media on both sides of the tube, concentration where relevant, temperature range, contaminants, cleaning chemicals and whether product contamination is acceptable. These details give the engineering review a defensible starting point.

Nickel Institute guidance describes how chloride-bearing and other aggressive environments can change the corrosion risk for common stainless grades. It does not support a universal table that assigns one grade to every fluid, so final material selection should remain application-specific and professionally reviewed.

• Process and coil-side media
• Concentration, pH or contaminants where relevant
• Temperature and cleaning method
• Acceptable corrosion or contamination limits

Keep operating conditions and design limits distinct

State the normal operating pressure and temperature separately from any design or maximum values. Add the required duty and flow conditions, but do not infer a pressure rating or wall thickness from a catalog photograph or one dimensional example.

If the project follows a customer specification, code or calculation package, identify the exact revision and which party is responsible for the mechanical design. The website checklist organizes inputs; it does not replace the approved engineering basis.

Design for installation, cleaning and removal

Show the access opening and the path the finished coil must follow into the vessel. Include supports, connection exits, nearby obstructions and the clearance needed for installation, inspection and removal.

For services that can foul, identify how the surface will be inspected or cleaned and whether the coil must be removable. ASHRAE heat-exchanger guidance treats fouling, pressure drop, material compatibility and maintenance access as connected design considerations rather than separate afterthoughts.

Release one controlled coil definition

The final data package should connect the tube definition, formed geometry, service basis, connections, supports and inspection scope to one drawing revision. Mark reference dimensions and controlled dimensions clearly.

For repeat orders, retain the approved revision and any accepted deviations with the order record. A sample or catalog geometry can help start the discussion, but production should follow the agreed drawing and material scope.