Suction bellmouths are designed for use in ship bilges to help with final stripping of liquid cargo tanks.
The suction bellmouth design prevents vortex and gas formation as well as minimizing hydraulic loss while pumping liquids from holding tanks. 
The suction bellmouth provides a 1.5:1 open area ratio to the pipe size while sitting on the bottom of the tank.

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Open Area Ratio

Connection

3-SBM-O-W N/A 3.5 in N/A 5 in N/A 11.75 in N/A 5.5 in N/A 0.44 in N/A 1.5:1 N/A Butt Weld (beveled end)
4-SBM-O-W N/A 4.5 in N/A 6.75 in N/A 15.25 in N/A 6.75 in N/A 0.5 in N/A 1.5:1 N/A Butt Weld (beveled end)
5-SBM-O-W N/A 5.56 in N/A 8.38 in N/A 19.25 in N/A 8.25 in N/A 0.63 in N/A 1.5:1 N/A Butt Weld (beveled end)
6-SBM-O-W N/A 6.63 in N/A 10 in N/A 23.25 in N/A 10 in N/A 0.75 in N/A 1.5:1 N/A Butt Weld (beveled end)
8-SBM-O-W N/A 8.63 in N/A 13.38 in N/A 30.75 in N/A 13.75 in N/A 1 in N/A 1.5:1 N/A Butt Weld (beveled end)
10-SBM-O-W N/A 10.75 in N/A 16.75 in N/A 39 in N/A 16.75 in N/A 1.25 in N/A 1.5:1 N/A Butt Weld (beveled end)
12-SBM-O-W N/A 12.75 in N/A 20 in N/A 45.38 in N/A 21.38 in N/A 1.5 in N/A 1.5:1 N/A Butt Weld (beveled end)
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