Boiler Pressure Gauge.
The boiler pressure gauge must have a Red line indicating the maximum working pressure, the line must be on the gauge face and not on the protective glass.
The pressure gauge must also have a siphon tube ( some times also called a pig`s tail ) between the boiler and the pressure gauge.
This Siphon tube fills up with water when the boiler is in operation, which prevents the hot steam from reaching the pressure gauge and possibly causing damage to the gauge.
The Gauge should also be properly calibrated by a competent company, who will issue a certificate for the gauge.
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Bend tube boiler or sterling boiler is the developed version of water tube boiler. The working principle of bend tube boiler is more or less same as other water tube boilers, but it utilizes four drums.
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