{HEAD ~ The heating and settling zones} have {TAIL ~ a unique, horizontally folded, generally sinuous configuration} which provides a maximum emulsion flow path length through the zones and hence maximum phase separation in the zones for a given tank size 
have
{ HEAD ~ The heating and settling zones } have { TAIL ~ a unique , horizontally folded , generally sinuous configuration } which provides a maximum emulsion flow path length through the zones and hence maximum phase separation in the zones for a given tank size
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH