FAQs

GAC performs quality audits using three methods: measuring lining thickness with ultrasonic gauges, conducting acoustic hammer-strike tests with a copper hammer to detect internal voids/air pockets, and casting beam samples on-site to verify actual 28-day compressive strength.

Abresist Fused Cast Basalt has a maximum continuous operating temperature limit of 350°C. Therefore, it cannot be used to line 450°C hot air ducts. Hot air ducts require Kalcret BTX castables (resisting up to 1,200°C) or Kalcor fused corundum-zirconia tiles (resisting up to 1,000°C).

Yes. At Vĩnh Tân 2 Thermal Power Plant, the system of 36 three-way coal splitters feeding the boilers suffered from severe, chronic steel wear and dust leakage. GAC re-engineered and cast these splitters with a 25mm monolithic layer of Kalcret BTX compound over an anchored steel mesh. The retrofitted splitters have remained operational, dry, and leak-free.

The internal steel casing of pipelines must be grit-blasted or mechanically ground to achieve a white-metal finish conforming to the SA 2.5 standard. Following blasting, GAC welds a 5mm expanded steel mesh at a precise 5mm clearance from the steel backing plate using high-strength anchoring pins.

Kalcret is a rapid-setting mortar powered by high-density nano-cements. If left uncured, moisture evaporates too quickly in hot boiler-room environments, triggering surface shrinkage cracks and reducing the lining’s final compressive strength by 30%. Spraying Kalcure forms a moisture-retention barrier, ensuring uniform hydration.

ASTM C704 is the international standard test method for measuring the erosion resistance of materials under high-pressure grit-blasting. GAC’s Kalcret BTX achieves an erosion volume loss of under 3.2 cm³ (certified by independent laboratory testing), demonstrating aerodynamic wear resistance 4 to 5 times superior to standard wear castables.

GAC welds threaded studs directly to the steel hopper wall, and the Tivar sheets are pre-drilled with countersunk recesses. Once locknuts are tightened using specialized spanners, the cavities are sealed with matching Tivar plugs flush-cut to the lining surface, leaving no protruding bolt heads to obstruct coal flow.

Tivar 88-2 features an extremely low dynamic friction coefficient (0.08) and near-zero water absorption (<0.1%). Its permanently glass-smooth surface prevents wet coal from bonding to the hopper walls. Cohesive coal slides down seamlessly, establishing an uninterrupted Mass Flow discharge profile.

High-moisture fine coal has high cohesive surface tension. When contacting hoppers lined with standard carbon steel, moisture induces rusting and pitting. The rough scale-covered steel anchors the wet coal, causing bridging (Arching) or rat-holing, which chokes coal feed to the pulverizer and drops boiler generating capacity.

GAC clads the leading edges of fan impellers with ultra-thin, 10mm-thick Kalocer high-alumina tiles bonded with heat-resistant Kalfix adhesives. Its extreme hardness (1,050 HV1) shields the blades from fly ash erosion. The glass-smooth surface and low density of Kalocer preserve dynamic balance, maintain draft capacity, and extend fan wear life by 3 to 4 times.

ID fans draw high volumes of hot flue gas containing abrasive fly ash that sandblasts the fan blade leading edges. Conventional weld hardfacing overlays create a rough, uneven profile that degrades aerodynamic efficiency, increases drag, and introduces static and dynamic imbalances, causing severe boiler vibrations.