Manhole is installed on the top of the tank, built Pressure&Vacuum Vent and Emergency Vent.
Pressure&vacuum vent,When inside pressure higher 68KPa or under 3KPa than the outside,will be open to balance the different pressure;when the different pressure less than -2 6KPa,the P/V vent will be closed to keep the product not voiatilized 
    Automatic sealing of P/Y vent in a roll over situation prevents dangerous and costly spillage
    when the inside pressure is higher 21 32KPa than the outside,emergency vent will be open automatic to keep tank safe.The vent capacity is 7000m3/h.
    Two-stage opening allows safe release of residual compartment pressure before fully opening the fill cap. 
    Easy maintenance,convenience,safety Working pressure: 0.

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• Manhole Flange
• RKG-2 Manhole
• RKG-1 Manhole

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