How to Install Calcium Silicate Pipe Insulation?
Calcium silicate pipe insulation is supplied as pre-formed half-shell sections (also called pipe covers or pipe sections). These are precision-molded to fit standard pipe diameters and insulation thicknesses. The installation process is straightforward and does not require specialized tools.
Step-by-Step Installation
Step 1: Prepare the Pipe Surface
The pipe must be clean, dry, and free of oil, rust scale, or loose paint. If the pipe is hot, allow it to cool to ambient temperature before installing the insulation. For pipes that will operate above 200°C, apply a coat of anti-corrosion primer to the bare pipe before insulating. This is standard practice for all mineral insulation materials.
Step 2: Fit the Half-Shell Sections
Each pipe section consists of two half-shells that fit around the pipe. Place the bottom half-shell on the pipe, then fit the top half-shell over it. The longitudinal joint (the seam between the two half-shells) should run horizontally along the sides of the pipe, not top and bottom. Stagger the longitudinal joints of adjacent sections by 90 degrees to avoid a continuous seam running the length of the pipe.
Step 3: Secure with Bands
Secure each section with stainless steel (304 or 316) bands or galvanized wire at 300mm intervals along the section length. Minimum two bands per section. The bands should be snug but not overtightened -- calcium silicate is rigid and does not compress, so excessive tension can crack the board. For pipe diameters above 300mm, use 20mm wide SS bands. For smaller diameters, 12mm bands are sufficient.
Step 4: Seal the Joints
All butt joints (where sections meet end-to-end) and longitudinal joints must be sealed with high-temperature inorganic joint compound or sodium silicate-based sealant. This prevents heat leakage at gaps and provides a continuous insulation envelope. Apply sealant evenly with a trowel or putty knife. For multi-layer insulation systems, stagger the joints between layers so they do not align.
Step 5: Apply Weather Jacket (Outdoor Installations)
For outdoor or exposed indoor installations, apply an aluminum weather jacket (0.5-0.8mm thick) or stainless steel cladding over the insulation. Overlap all circumferential seams by 50mm minimum in the direction of water runoff. Seal longitudinal seams with weatherproof tape or sealant. The jacket protects the insulation from moisture, mechanical damage, and UV exposure.
Dry-Out Procedure
After installation and before bringing the pipe to full operating temperature, perform a gradual heat-up. Heat the pipe at approximately 20-30°C per hour to allow any residual moisture in the insulation to escape as vapor rather than flash to steam. This prevents steam pressure damage within the board. For detailed procedures, see our technical installation guides.