Flat Bolted Sight Glasses for Pressure Vessels

According to DIN 28120

Saniquip’s Max Müller range of bolted circular sight glass fittings are most commonly installed on pressure vessels to allow visual inspection of the processes inside. The sight glass consists of a weld-in base flange, a sodium silicate or borosilicate viewing disc, a cover flange, and the required gaskets, nuts and studs.

These sight glasses are manufactured according to the dimensions and constructional guidelines of the DIN specification 28120. Adherence to these guidelines and the prescribed flange thicknesses ensures distortion free welding when correct procedures are followed. The maximum operating temperature is limited to 150°C when using sight glass discs in sodium silicate to DIN 8902, or to 280°C when using sight glass discs in borosilicate to DIN 7080 (must be used in conjunction with suitable gaskets).

All metallic parts can be delivered permanently marked and inclusive of material certificate 3.1(B). The borosilicate glass disc is available with material certificate 2.2. Gaskets can be delivered in an FDA compliant material with associated certification on request.

The Saniquip Max Müller range of bolted circular sight glass fittings are manufactured in sizes from DN50 to DN200.

Executions suitable for 10 bar or 16 bar maximum pressures are offered according to DIN 28120. Variants for 2.5 bar and 6 bar maximum pressures can be offered in executions similar to DIN 28120.