Wusheng marine manhole cover

Product description

Our company professional produces marine manhole cover.There are 5 types for clients to choose from,such as A,B,C,D and E.This product is mainly applicable to marine water-tight or oil-tight manhole cover but not to boiler and pressure tank.Based on the shape,it’s classified into oval and round.The oval shape is used more widely.Based on the tightness,it’s classified into oil-tight and water-tight.The difference between them lies in the material of sealed gasket.For oil-tight,oil-resistance rubber should be adopted while sea or fresh water-resistance rubber should be adopted for water-tight.Based on if the hole surface exceed or not after installation,it’s classified into exceeded or embedded.Based on the structure of exceeded manhole cover,it’s classified into 3 types,such as A,B and C.While for the embedded manhole,it’s classified into 2 types,such as D and E.

Executive standard

National standard:GB11628-89