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Hazelton, Kansas | Collegeboy:
Another issue in knife plugging is the manifold pressure.
Conventional Manifolds: Consider installing orifice hose barbs at the outlets, sized to produce about 40 psi in the manifold. In normal operation, you want the 40 psi delta p to occur across the orifice, with very little pressure drop in the hose and knife. Then, when a knife starts to plug and flow for that run falls off, the full 40 psi is applied to clear the plug.
Vertical Dams: If set up right, the vertical dam already does all this.
I, too, am a believer in chopping off the pinched and drilled knife tube bottoms. Several knive builders will make them with open tubes, if you ask. The pinched and drilled bottoms amount to a balancing orifice...and that is a bad location to have it, due to wear, dirt, mechanical damage, etc., It is far better to balance the flow with an orifice in the hose barb exiting the manifold, IMHO.
MDS
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Plowboy, your NH3 chisel points
