Home |
| About Us |
| Contact Us |
| Credits |
| Customer Services |
| Services |
| Shopping Cart |
| Technical Information |
| Site Map |
| Tubular Gauge Glass |
| Spectraglass manufacture tubular gauge glasses for
heavy duty sight level work for a wide range of applications including
boilers, tanks and pressure vessels They are manufactured from highly chemical and corrosion resistant low expansion Borosilicate glass, especially noted for its clarity and mechanical strength properties. Our stock includes all of the popular diameters of tubing including:- 3/8", 7/16" 1/2", 9/16" 5/8", 11/16", 3/4", 7/8" and 1", however we are able to manufacture glass to specific customer requirements. We stock in the main up to 72" or 2 meters long but again we can produce in longer lengths upon special request. The glasses can be supplied from stock in any length up to 78.3/4" (2 meters) with ends cut or flame polished. It is assumed that lengths 48" or below are to be used as finished gauge glasses and are, therefore, supplied with flame polished ends. |
| Corrosion |
| In Steam boiler service, corrosion of gauge glass presents
a considerable variety of problems, namely, the temperature of saturated
steam increases with the steam pressure resulting in an increased rate
of attack ( a flat transparent gauge glass can be protected using a mica
shield but this is not possible where tubing is concerned). Chemical treatment of boiler feed waters to reduce steel corrosion will produce an alkalinity of the water at Ph values between 10 and 11, sometimes higher, leading to further increases in the rate of wear of the glass. Fortunately, the water in contact with the gauge glass, being furnished largely by condensate through the upper connection to the boiler, will be less alkaline than that in the boiler. This condensate, by flowing over the glass, dissolves minute quantities of silica. These small quantities of silica in solution inhibit the attack of the boiler water in the glass to a considerable extent. The fresh condensate entering the gauge will often attack the glass in upper areas, more than in the lower part of the gauge, where the temperature is lower and where the degree of saturation of silica is greater. This effect is particularly more noticeable in the case of tubular gauge glasses. Apart from the boiler pressure, which determines the saturation steam temperature, the other factors determining corrosive rate of attack are:
In general, it is found that tubular type gauges are not suitable at pressures beyond 300 to 350 psi. |
| Pressure Ratings | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||