Process Equipment and Plant Design
A cylindrical storage tank can have a self supported conical roof,

If its diameter is less than 15-20metres
If the thickness of the roof is more than that of the cylindrical shell
Irrespective of its diameter
If its diameter is more than 50 meters

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Process Equipment and Plant Design
In case of design of a shell and tube heat exchanger,

Minimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch
O.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres
All of these
Minimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto 15 mm tube diameter; and for > 15 mm tube diameter, tube sheet thickness is smaller than tube diameter

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