One tube sheet is fixed to the shell; the other floats so the bundle can grow axially and, in many layouts, be withdrawn for shell-side cleaning — common when differential temperature or fouling is significant.
A floating head lets one perforated sheet move with the tubes. That relieves differential expansion and often allows the bundle to be pulled for mechanical cleaning.
In a floating tube sheet exchanger, one sheet is typically welded or bolted in a fixed position while the opposite sheet floats inside a rear cover or floating-head assembly. Tubes expand independently of the shell length, reducing axial stress on the tube-to-tubesheet joints.
Because the bundle can often be withdrawn, floating designs are common in fouling services. The trade-off is more joints and seals at the floating end — leakage paths must be managed in the detailed design, which is outside the scope of this educational page.
See also fixed, U-tube, and the hub types comparison.
| Structural arrangement | One fixed end; one floating tube sheet / head |
| Thermal expansion | Free axial movement of the floating end |
| Shell-side cleaning | Bundle often withdrawable for mechanical cleaning |
| Typical service context | Higher ΔT, fouling shell-side fluids |
| Governing context | ASME Section VIII / TEMA as named on the drawing |
Use the buyer's guide checklist, then send a drawing-led pack via the enquiry form or WhatsApp +91 95946 39793.
A floating tube sheet is free to move axially relative to the shell so the tube bundle can expand with temperature and, in many designs, be withdrawn for cleaning. The opposite end is typically fixed.
Higher differential temperature and shell-side fouling that needs mechanical cleaning are the usual drivers. Confirm against the project datasheet — this page does not set a numeric ΔT cutoff.
Often the floating head manages tube-side expansion relative to the shell. Whether a shell expansion joint is still required is a design decision for the responsible engineer.
Drawing or envelope, floating-head type if known, material, hole table, joint method, code edition and inspection pack. Use the buyers guide checklist, then enquire.
U-tube uses a single sheet with U-bends so each tube expands independently, but tube-side cleaning through bends is limited. Floating keeps straight tubes with a free end. See the U-tube spoke and hub table.
Every enquiry is checked against governing code, material compatibility and manufacturing feasibility before a quote is issued. NPRO states ISO 9001 QMS and mill-test / NDT documentation practices on About — project-specific stamps or PED/CE are confirmed during enquiry, not assumed from this page.
Send the floating-head arrangement (if known), drawing and material notes — we confirm manufacturability before quoting.