90hatch
90 Hatch How does it work?
  • The 90 Hatch is an indispensable safety floor hatch and safety fence combined.
  • The 90 Hatch was designed by THE KANSAI ELECTRIC POWER CO., INC. through their Quality-Control circle about 20 years ago, and ANANDENKI was chosen as the exclusive maker. Since then, nearly 1,000 units of the 90 Hatch have already been installed at numerous facilities in Japan, such as nuclear, thermal and hydraulic power plants, transformer stations, public facilities such as sewage plants and pump stations, and so on.
    The main applications at nuclear and thermal power plants are turbine building, nuclear reactor building, ancillary facilities building, and radioactive waste treatment center building.
The 90 Hatch dramatically reduces the time and cost required for hoisting work.Features of the 90 Hatch (universal design)
Comparison of the 90 Hatch with a conventional hatch
Specifications
  Description Design range
1 Opening size Any size is possible.
Examples:
1500mm x 1500mm
2000mm x 4000mm
6000mm x 6000mm
3500mm x 14000mm
etc...
2 Cover plate design Grating cover, Checker plate,
or Flat steel plate
3 Retrofitting of old hatch Old hatch rest may be used
4 Finish design Painted in a color/design specified by the customer
5 Uniformly distributed load (UDL) 500kg/m2~2,000 kg/m2
Stronger designs available upon request
6 Airtight/Watertight design Available upon request
*customized designs available upon request
Installation Examples

Mihama Nuclear Power Plant – The Kansai Electric Power Co., Inc.

Closed
Closed		 Opening
Opening		 Opened
Opened
  • Date of Installation:January 2006
  • Size:3.35m x 2.7m
  • Maximum load:500kg/m2

Himeji No.1 Thermal Power Station – The Kansai Electric Power Co., Inc.

Closed
Closed		 Opening
Opening		 Opened
Opened
  • Date of Installation:September 2006
  • Size:3.5m x 1.85m
  • Maximum load:500kg/m2

Kannagawa Hydraulic Power Station - The Tokyo Electric Power Co., Inc.

Closed
Closed		 Opening
Opening		 View from the underneath
View from the underneath
  • Date of Installation:March 2003
  • Size:3.8m x 2.8m
  • Maximum load:2,000kg/m2

Prototype Fast Breeder Monju - Japan Atomic Energy Agency

Closed
Closed		 Opened
Opened		 View from the underneath
View from the underneath
  • Date of Installation:February 2004
  • Size:4.5m x 4m
  • Maximum load:1,500kg/m2

Maishima Sewage Center - Osaka City

Closed
Closed		 Opened
Opened		 Installing
Installing
  • Date of Installation:March 2003
  • Size:7m x 4.5m
  • Maximum load:1,000kg/m2