CB/T 4392 type BC square semi raised multi bolts hatch cover is a kind of watertight and oiltight manhole. It meets the latest standard of CB/T4392. It is made of steel with stainless bolt and nut. We also produce whole cover with 304 or 316 stainless steel. It can be used to various merchant vessels. Customization design and material is available. The bolts can be welded on the ring or screw on the ring.
Main Technical Specification:
Standard: CB/T 4392-2014;
Type: BC, semi raised ring, square type;
Weight: 67.1-124.5kg;
Attachment: Hinged or bolted with hinge;
Coaming: Raised, Semi flush, Flush, Sunk;
Gasket: Neoprene, Buna A, or Customized;
Bolt & Nut: Stainless steel, bronze, brass;
Material: Mild Steel, Stainless Steel;
Test: Hydraulic Pressure Test;
Dimension: As Standard or Customized as inquiry;
Application Type: Water-tight, Gas Tight, Oil Tight;
Surface treatment: sandblasting to S2.5 + one layer of epoxy shop primer, Polished, Galvanized, customized surface treatment available.
Classification Certificates: CCS, NK, BV, ABS, DNV, LR, KR, IRS, RS, RINA.