Sight Glass according to DIN 2812
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Sight Glass according to DIN 2812 - 1

Sight Glass according to DIN 28120 PD 66326 GB 2002-02 Keep an Eye on Your Product Application The bolted sight glass is used for visual control of processes inside vessels which typically are under high pressure and have temperatures. The sight glass is used in chemical, pharmaceutical and cosmetical industries as well as in dairies, breweries and other food industries. Standard Design The sight glass consists of a base flange, a cover flange, gaskets, a glass disc, nuts and studs. The sight glass is to be welded into or onto vessel walls and it corresponds in its construction and assembly to the dimensions and constructional guidelines of the DIN specification 28120. The respect of the DIN prescriptions for the flange thicknesses guarantees a distortion free location of the sight glass disc in case of correct welding. The pressure resistance of the glass disc is, of course, dependent on the care with which the bolts and nuts are tightened (always working on diametrically opposed pairs). For lubricated bolts, Ra = 0.1mm, the recommended tightening torque values (in Nm) are indicated in the table on page 2. The glass discs are made of borosilicateglass to DIN 7080 which means that the maximum operating temperature is 280°C. All steel parts available with material certificate EN10204. 3.1B/AD-W2. Technical Data Max. product pressure: Max. 1000 kPa (10 bar) Min. product pressure: Full vacuum. Temperature range: -10°C to +140°C (EPDM), (higher temperatures up to 280°C with gaskets of Klingersil). Fig. 1. Sight Glass DIN 28120. Materials Base flange: AISI 316L, material certificate 3.1B/AD-W2. Cover flange: AISI 321, material certificate 3.1B/AD-W2. Gaskets: Klingersil C4400 (cover side)/EPDM (product side). Glass disc: Borosilicate to DIN 7080, material certificate 2.2 (max. 280°C). Bolts or studs: To DIN 938/934 in A2-70.

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Sight Glass according to DIN 2812 - 2

PD 66326 GB 2002-02 The information contained herein is correct at the time of issue, but may be subject to change without prior notice. How to contact Alfa Laval Contact details for all countries are continually updated on our website. Please visit www.alfalaval.com to access the information direct. Installation The numbers in the following installation instructions refer to the drawing above. After having correctly welded the base flange (1) onto or into the vessel wall, the gasket (2), the sight glass disc (3), the gasket (4) and the cover flange (5) are mounted one after the other and...

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