Industry Detail
Oil & Gas Processing
Fire-rated insulation, passive fire protection, and refractory linings.
Refractory & Insulation for Oil & Gas Processing
Oil and gas facilities — from upstream production through storage terminals to downstream distribution — depend on insulation systems that hold product within temperature specification, protect personnel, and control the pipe wall conditions that lead to corrosion under insulation. The thermal duty is generally less extreme than in refractory-led industries, but the consequences of insulation failure are more serious, because the pipework contains hydrocarbons and the failure mode is wall loss rather than heat loss. Fired equipment is present too: heaters, flare systems, and thermal oxidisers require refractory linings capable of continuous high-temperature service and of tolerating the thermal shock of trips and start-ups. Fire protection adds a further layer, since penetrations and equipment in fire-rated areas must maintain their rating. Zenco Systems supplies calcium silicate and rockwool insulation, aluminium foil faced systems for CUI-susceptible service, refractory castables for fired equipment, and fire sealants, gaskets, and packings to oil and gas operators across Kenya and East Africa.
Solutions We Supply
Insulation & Refractory Selection by Service
| Zone / Equipment | Service Conditions | Recommended Materials |
|---|---|---|
| Fired heaters & flare systems | 900–1500°C, cyclic trips and start-ups | High alumina refractory castable, refractory castable, ceramic fibre blanket |
| Hot process & crude lines | 150–400°C, product temperature maintenance | Calcium silicate board, rockwool insulation, thermal insulation roll |
| CUI-susceptible pipework | 60–150°C, moisture ingress, hydrocarbon containment risk | Aluminum foil insulation blanket, aluminum foil tape, rockwool insulation |
| Storage tanks & vessels | Ambient to 200°C, very large surface area, weather exposure | Rockwool insulation board, high temperature insulation board |
| Fire-rated penetrations & barriers | Fire rating retention, smoke sealing | Fire sealant S160, fire retardant foam, ceramic fibre blanket |
| Valves, pumps & flange assemblies | Sealing under pressure, thermal movement, 300–1200°C at hot joints | Graphite packing, high temperature gasket, high temperature gasket tape |
Common Failure Modes in Oil & Gas Processing
Corrosion under insulation on hydrocarbon service
Water trapped beneath insulation corrodes pipe and vessel walls out of sight, and on hydrocarbon service the end point is loss of containment. The 60–150°C range is the most aggressive, and because the damage is hidden until insulation is stripped, inspection strategy matters as much as the original specification.
Weather exposure on outdoor installations
Most oil and gas insulation is outdoors and exposed to driving rain and thermal cycling. Cladding laps, sealant joints, and vapour barriers degrade under UV and movement, and once water finds a path in, the insulation both loses performance and becomes a corrosion reservoir against the steel.
Maintaining fire ratings at penetrations
Every penetration through a fire-rated barrier has to maintain that rating, and modifications made during routine maintenance frequently compromise seals that were correct at commissioning. This is a compliance exposure that accumulates quietly across a facility's life.
Thermal shock in flare and fired equipment
Flare systems and fired heaters experience rapid temperature swings during trips, start-ups, and flaring events. Refractory linings specified only for steady-state service degrade quickly under this cycling, and the damage is driven by event frequency rather than by cumulative running hours.
How to Specify the Right Material
Let the temperature band and the risk case drive the specification. In the 60–150°C CUI-susceptible range, the controlling requirement is moisture exclusion: aluminium foil faced insulation with fully sealed laps, a continuous vapour barrier, and cladding detailed to shed water. Above roughly 150°C on hot process and crude lines, the requirement shifts to product temperature maintenance and personnel protection, where calcium silicate board handles load-bearing and support positions and rockwool covers the general run economically. Storage tanks and vessels are a large-area, weather-exposed duty best served by rockwool insulation board with robust cladding detail. For fired heaters and flare systems, refractory castables — 1600°C standard or 1750°C high alumina — should be selected with thermal shock in mind, since cycling rather than peak temperature is what degrades them. Fire-rated penetrations require fire sealant and fire retardant foam specified to maintain the barrier rating.
Installation & Maintenance Notes
- Seal every lap, joint, and penetration with aluminum foil tape and maintain vapour barrier continuity — this is the primary defence against corrosion under insulation.
- Detail outdoor cladding to shed water, with laps oriented downward and sealant maintained at horizontal runs, valve boxes, and flanges.
- Re-establish fire sealant at any penetration disturbed during maintenance; a fire barrier modified without resealing quietly loses its rating.
- Use load-bearing insulation at pipe supports so insulation is not crushed into a thermal bridge and moisture trap.
- Inspect flare and fired heater refractory after trips and flaring events rather than only on the maintenance calendar, since cycling drives the damage.
Materials Used in Oil & Gas Processing
Oil & Gas Processing Refractory & Insulation FAQs
Why is corrosion under insulation such a priority in oil and gas?
Because the failure mode is loss of containment of hydrocarbons rather than simply heat loss. Water trapped against the steel beneath insulation corrodes the wall invisibly, most aggressively between roughly 60°C and 150°C. Since the damage is hidden until the insulation is removed, both the original detailing and the inspection strategy matter.
What insulation should be used in the CUI-susceptible temperature range?
Aluminium foil faced insulation with every lap sealed, a continuous vapour barrier, and cladding detailed to shed water. Rockwool is commonly used as the insulating layer, but the performance in this band is determined by moisture exclusion detailing rather than by the insulation material or thickness alone.
What refractory suits flare systems and fired heaters?
Refractory castable rated to 1600°C for general duty and high alumina castable to 1750°C for higher-temperature or flame-impinged positions. The selection should weigh thermal shock resistance heavily, because trips, start-ups, and flaring events — not steady running — are what degrade these linings.
How do you insulate large storage tanks economically?
Rockwool insulation board gives the best cost per square metre across the large surface areas involved. Because tanks are weather-exposed, the cladding and sealing detail is what determines whether that insulation still performs in five years — water ingress is the usual failure route rather than material degradation.
What materials maintain fire ratings at penetrations?
Fire sealant S160 rated to 1500°C and fire retardant foam, with ceramic fibre blanket for packing irregular openings. The important operational point is that any penetration disturbed during maintenance must be resealed to the original specification, or the barrier quietly loses the rating it was commissioned with.
What sealing materials are used on valves and pumps?
Graphite packing rated to 450°C is standard for valve stem and pump shaft sealing, with high temperature gaskets and gasket tape for flange assemblies. Selection should account for the pressure, temperature, and the fluid being contained rather than temperature alone.
Do you supply upstream, terminal, and distribution facilities?
Yes. Production facilities, storage terminals, and distribution depots share the same insulation and sealing requirements — CUI control, personnel protection, fire barrier integrity, and valve sealing — with the balance shifting by facility type. We supply operators across Kenya and East Africa.