2.4 Bio-Bucket Hatch

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2.4 Bio-Bucket Hatch

The Bio-Bucket Hatch is the standard mission course hatch that has been repurposed since 2019. The hatch supporting structure (hoop and support pipe) were used in 2019 and 2021 to orient the hatch in a horizontal orientation.

The hatch frame used in the International SeaPerch Challenge is constructed by gluing the pipe and fittings to create a sealed frame eliminating the need for additional flotation. When unlatched the hatch will open without assistance of the ROV.

Hatch Frame Construction

All pipes and fittings for frame are 1/2" Sch 40 PVC unless noted in illustrations.

Read the entire Hatch Frame Construction section before beginning construction.

If you are gluing the pipes and fitting it is recommended to use PVC solvent cement. Follow the manufacturer’s safety and usage instructions.

If you are building the hatch without gluing the pipes and fitting then you will need to add floatation to the frame end near the latch. A pool noodle cable tied to the hatch frame will work, but will need to be adjusted so the hatch opens without putting to much force on the latch when the hatch is closed.

Hatch Cover Plate Construction

Attaching Hatch Cover Plate

Center the frame over the cover plate. Mark the locations of 8 cable tie slots as shown. The locations are not critical. Punch or cut slots for cable ties. A large flat blade screwdriver works best for punching slots in plastic sheet.

Hatch Frame Parts List

Item

Unit

Qty.

1/2" Sch 40 PVC Elbow

Each

1/2" Sch 40 PVC Tee

Each

1/2" PVC Sling Tee (Furniture Grade)

Each

1/2" Sch 40 PVC Pipe x 1.5" Long

Each

1/2" Sch 40 PVC Pipe x 2.5" Long

Each

1/2" Sch 40 PVC Pipe x 2.75" Long

Each

1/2" Sch 40 PVC Pipe x 3" Long

Each

1/2" Sch 40 PVC Pipe x 4" Long

Each

1/2" Sch 40 PVC Red Pipe x 4" Long

Each

1/2" Sch 40 PVC Pipe x 4.25" Long

Each

1/2" Sch 40 PVC Pipe x 17" Long

Each

Polypropylene Corrugated Sheet, 0.157" Thick, 18" X 18"

Each

#8 X 5/8" Stainless Steel Flanged Head Self-Drilling Screw

Each

6 to 8" Cable Tie (for Cover Plate)

Each

4" to 6" Cable Tie (for Latch Rope)

Each

1/4” Polypropylene Rope x 12” Long

Each

Hatch Hoop Construction

The outside diameter of the PEX pipe may be slightly than the inside diameter of the 1/2" PVC pipe. It may take considerable force to insert the PEX pipe into the PVC pipe. Sanding or filing the end of the PEX pipe may be required.