PRODUCT DATA SHEET Detailed on this page are some of the important safety features that are exceptional or unique to all Emco Wheaton’s manhole covers. We have manufactured manhole covers for petroleum F0512 F0337 F0338 F0355 F0339| MANHOLE COVER SAFETY FEATURES F0512 F0337 F0338 F0355 F0339 tankers for over 50 years and these features have evolved through our experience and consultation with international oil companies, nearly all of who use the Emco Wheaton manhole cover. Emergency Venting at a massive 7000m³/hr via the pressure actuated fill cap safeguards against tank explosion in the event of a fire. EMERGENCY VENTING 1 1 BLIND BOLT HOLES AND WEBS CAST All bolt holes are blind i.e. they do not break through to the underside of the manhole cover. This is to ensure that no liquid cargo can leak through. 2 Webs cast on underside of the base plate and fill cap increases the structural integrity. 3 3 2 SPRING EMERGENCY VENTING Four visible, corrosion proof, plated spring emergency venting. The springs are not shrouded in a rubber sleeve, which was the cause of a major failure on another manufacturer’s manhole cover due to rainwater ingress that could not dry out and consequently corroded the single spring. The corrosion was not evident, as the spring was not visible. The UK Health & Safety Commission identified this as a cause of failure in an official report. 4 4
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