Heat Exchanger: Reject a Risky Rate Rise

Proposed process changes may prompt operating problems.

1503 puzzler mn

This Month’s Puzzler We use a lobe pump to move a sealant product from a reactor, after a conditioning heat exchanger, into a static mixer where we add 1 gph of stabilizer before sending the final formulation to the packaging fill line. The pump was sized for 35 gpm in a 3-in. Schedule-10 pipe. The operators claim they can get 40 gpm, sometimes 42 gpm, out of this pump. With some products, this occasionally is true. Now, management wants to increase the capacity of the fill lines to 40 gpm by taking advantage of this higher flow rate. Part of the plan calls for raising the exit temperature of the conditioning exchanger to get more flow. The research group is readying…

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    This Month’s Puzzler We use a lobe pump to move a sealant product from a reactor, after a conditioning heat exchanger, into a static mixer where we add 1 gph of stabilizer before sending the final formulation to the packaging fill line. The pump was sized for 35 gpm in a 3-in. Schedule-10 pipe.

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