Service Detail
Refractory & Insulation Installation
Professional on-site lining and insulation application.
How We Help
A refractory lining is only as good as its installation. The most common causes of early failure are not material defects but installation faults: castable dried too fast and spalled on first heat, brick rings closed without expansion allowance that buckled when the furnace came up, fibre joints butted flush that opened as the blanket settled, and anchors reused past their service life. Every one of those is avoidable, and every one is expensive to discover after the equipment is sealed and hot. Zenco Systems provides on-site installation supervision and technical support for refractory and insulation systems across Kenya and East Africa — brick and castable linings, ceramic fibre modules and blanket, calcium silicate backup, and the anchoring and sealing that hold them in place. The objective is a lining that reaches its designed campaign life rather than one that needs attention at the next unplanned stoppage.
What Installation Support Covers
Brick and castable lining supervision
Ring closure and expansion allowance, bedding on a mortar matched to the brick grade, joint tightness, and correct placement sequence for monolithic sections.
Ceramic fibre module and blanket fitting
Joint compression to allow for in-service settlement, layer staggering, and hot-face orientation on furnace roofs, walls, and reheat furnace linings.
Anchor system installation and inspection
Anchor type, spacing, and condition assessment. Anchor failure causes more lining loss than material degradation and is routinely misdiagnosed as a material fault.
Dry-out and curing schedules
Published heat-up curves for castable sections, with hold points. The single most common cause of premature castable failure is heating faster than free water can leave the lining.
Backup insulation and shell sealing
Calcium silicate and mineral wool backup fitted without gaps, plus door, hatch, and duct joint sealing with high-temperature rope and gasket tape.
How the Work Runs
- 1Pre-installation reviewConfirm material grades against the duty, check quantities against the take-off, and verify anchors and shell condition before anything is placed.
- 2Surface and anchor preparationRemove degraded lining and scale, assess and replace anchors, and confirm the substrate is sound enough to carry the new lining.
- 3Placement supervisionSupervise brick bedding, castable mixing and placement, or fibre module fitting, with attention to mix water, joint treatment, and cold-joint avoidance.
- 4Controlled dry-outApply the published heat-up curve with hold points, so trapped water leaves gradually rather than flashing to steam and spalling the lining.
- 5Handover and recordDocument what was installed where, with grades, quantities, and dates — the baseline that makes the next inspection meaningful.
What You Receive
- On-site supervision through placement and dry-out
- Material grade confirmation against the actual service duty
- Anchor condition assessment and replacement guidance
- Documented dry-out schedule with hold points
- As-installed record by zone for future inspections
When You Need This
Any full reline, a first installation on new equipment, a conversion from brick to fibre lining, or a repair large enough that getting the dry-out wrong would cost more than the materials. It is also worth having supervision on a first castable placement with an unfamiliar crew, since mix water and cold joints are where inexperienced installations most often go wrong.
Refractory & Insulation Installation FAQs
Why does refractory fail shortly after installation?
Most often because of the dry-out. Free water trapped in a thick castable section flashes to steam if the lining is heated faster than the published schedule, causing explosive spalling. The other frequent causes are anchor failure and incorrect expansion allowance in a brick ring — none of which are material defects.
Can the dry-out schedule be shortened to save outage time?
No. Rushing heat-up to recover schedule typically causes spalling and costs far more time than the schedule would have taken. The dry-out has to be built into the outage plan from the start rather than compressed at the end of it.
Do you install, or supervise our own crew?
Both are possible. Many plants have capable maintenance crews who need technical direction on grade selection, joint treatment, anchoring, and heat-up rather than additional labour. Supervision is often the more economical arrangement and leaves the knowledge in-house.
How important are anchors?
They are one of the most common root causes of lining loss and among the most frequently overlooked. A correctly specified lining on corroded or distorted anchors will still fall. Anchors should be inspected at every reline and after any significant thermal upset.
What goes wrong with ceramic fibre installation?
Joints butted flush rather than compressed. Fibre settles in service, so a flush joint opens into a direct heat-loss path within a campaign. Under-specified density is the other common issue — light grades erode faster under gas flow and lose insulating value early.
Do you supply the materials as well?
Yes. We supply refractory bricks, castables, mortars, ceramic fibre, calcium silicate, mineral wool, and sealing materials across Kenya and East Africa, and can handle supply and installation support together or either separately.