Product Name: Ss Manhole Cover for Chemical Tanker Model NO.: H801A-500 Material: Carbon Steel Connection: Hoop Trademark: DonOO Transport Package: Carton Specification: 20 Origin: Zhejiang Product Description Internationallyacceptedandspecifiedbyoilcompaniesaroundtheworldtoassistwiththesafeconveyanceofpetroleumbasedproducts.The Donoo rangeoflightweightaluminiummanholecoversofferunrivalledsafetyfeaturesandoperationalbenefits.Pressureandvacuumventfittedasstandardfortankbreathing;variousratingsareavailabletosuitoperationalrequirements.SpringloadedfillcapprovidesemergencyfireengulfmentventingtoNTTCDOT406,requiredintheeventofthetankbeingexposedtoafire.Emergencyventingcapacity7000m3/h,airat350mb.AutomaticsealingofthePressureandVacuumventinarolloversituationpreventsdangerousandcostlyspillage.Self-aligningsealensurespressuretightoperationatalltimes.Twostageopeningallowssafereleaseofresidualcompartmentpressurebeforefullyopeningfillcap.250mm(10")fillcapforsafe,troublefreetoploading.Highqualitydiecastbaseplateandcomponentmaterialstointernationalstandardsareusedfordurabilityandperformance.Lowprofiledesignminimisesrolloverprotectionrequirements.Securityfacilityforpadlock,wireorplasticseal.Accessoryportsfor threadedcompartmentventvalveandover-spillpreventionprobe.ThebaseplatecanbesuppliedwithaccessoryholesfortankersthataretobeconvertedtoBLVRlater.