Check this box if there is a backing ring. A backing ring is a second flange used to sandwich the tubesheet of a floating head heat exchanger. If the backing ring is a split ring, consider the following guidelines:
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If the ring has one split, then it has been split along a diameter into two pieces. For split rings, the bending moment on the ring is multiplied by 2.0.
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A ring with two splits has been sliced in half like a bagel, and then each half has been split along a diameter. The ring is assembled with the diametrical splits offset by 90-degrees. For this case, enter the thickness of one half of the original ring, since each half is required to support 75% of the original design moment.