Square manhole cover:
Type: External opening manhole
Diameter: 235-535 mm
Maximum pressure: 1.0 bar
Height: 65/80/100/120/150 mm
Handle: wrench type/hand wheel
Connection method: welding/clamping/thread
Material: AISI 304 / AISI316L
The cover plate, coaming plate and seat ring of the double lock manhole are usually made of hot-rolled carbon steel or made of the same material as the hull structure where the manhole cover is installed.
The hot ring and the handle are made of ordinary carbon cable steel: the sealing hot ring is made of flame-retardant or sea (fresh) water resistant rubber bolts or studs are made of stainless steel or carbon steel, and the nuts are made of carbon steel, stainless steel or brass. . Bolts, studs, nuts and washers made of carbon steel should be galvanized.
1. Divided by the direction of the manhole:
According to the direction of the manhole, it can be divided into straight-through manhole, three-way manhole, four-way manhole and oblique-through manhole. For details, see Table 1 below. Among them, the oblique manhole is divided into five types: 15°, 30°, 45°, 60°, and 75°. The angle of each oblique manhole can be applied within the range of ±7.5°.
2. Divided by the load bearing capacity of the manhole overlying:
According to the load bearing capacity of the manhole overlying, it can be divided into two types: steam-20 grade and steam-10 grade.
If you want to choose, you must choose the high-quality humanized design of stainless steel manholes. DEGONG's double-lock tank manholes are beautiful in appearance, and the overall thickening design is more pressure-resistant, temperature-resistant, corrosion-resistant, prolongs service life, durable, and structure Simple, convenient and flexible to install, use meticulous craftsmanship, strict quality control, pay attention to every detail and every quality.