MAXOS®
Safety Sight and Level Gauge Glasses
Bending strength is determined by the surface compressive stress and the inherent resistance of the glass. The inherent resistance is heavily dependent upon the surface quality.
For safety reasons, the stress to the glasses caused by internal forces, thermal stress and vessel pressure have to be totally absorbed by the surface compressive stress so that a tensile stress of the glass surface is prevented.
| Application conditions | Maximum permissible pressure | Maximum permissible temperature | ||
|---|---|---|---|---|
| bar | psi | °C | °F | |
| Saturated steam or hot water in direct contact with reflex or transparent sight glasses | 35 | 500 | 243 | 470 |
| Saturated steam or hot water in contact with transparent sight glasses protected with mica | 103 | 1,500 | 320 | 608 |
| Non-corrosive, non-steam service and no technically significant glass attack, with reflex or transparent glasses | 280 | 4,000 | 38 | 100 |
| Transparent sight glasses in contact with medias with no technically significant glass attack | 345 | 5,000 | 38 | 100 |
| High pressure transparent sight glasses in special gauges | 414 | 6,000 | 38 | 100 |
| Thermal shock resistance | Δ T 230 °C |
| Max. permissible temperature | 300 °C (572 °F) |
| Protected with mica | 320 °C (608 °F) |
| Standard level gauge glasses | |
|---|---|
| ≥ 90 N/mm2 | 13,000 psi |
| Average 100 N/mm2 | 14,500 psi |
| High pressure level gauge glasses | |
|---|---|
| ≥ 100 N/mm2 | 14,500 psi |
| Average 110 N/mm2 | 16,000 psi |
| Standard level gauge glasses | |
|---|---|
| ≤ 0.13 mm | 0.005 inches |
| High pressure level gauge glasses | |
|---|---|
| ≤ 0.05 mm | 0.002 inches |
| Standard level gauge glasses | |
|---|---|
| ≥ 150 N/mm2 | 21,000 psi |
| Average 170 N/mm2 | 25,000 psi |
| High pressure level gauge glasses | |
|---|---|
| ≥ 180 N/mm2 | 26,000 psi |
| Average 200 N/mm2 | 29,000 psi |
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