The reliable solution for unsaturated Polyester Resin
Breakdowns and downtimes were no longer acceptable.
|Pumps installed up till now:
|CD 81 ERFT 3U22PAL
|CD126 ERFT 3U22PAL
|HD/PD 126 ERFT1U22PAL
|CD81 ERFT 3U22PA
The problem involved in pumping unsaturated resin was well-known to us. Among other things the temperature of the medium must be kept below 50°C in order to avoid coagulation. Thus it is necessary to limit the friction at the shaft seal to a minimum. Moreover, a continuous flow of the product over the shaft seal should be ensured in order to remove the heat which is inevitably generated. If a pump with a large volume and a maximum of 150 RPM was selected, internal friction in the pump would also be reduced to a minimum.
DESMI built a test pump by means of standard parts from the CD + HD/PD pump ranges with stuffing box plus 2 special, machined parts as well as 2 special shaft seal rings and a ground rotor shaft coated with tungsten carbide at the shaft seal area.
The pump was equipped with a short suction pipe from the seal housing to the suction side of the valve.
This pump, named CD81ERFT, code 3U22PAL, No. 268285, has been in intermittent duty for approx. 3-4 hours a day since the beginning of February 1997, 136 RPM x 5 bar x approx. 4000 cSt, without leakage.
30 pumps of this special “PAL” design (deduced from Palatal BASF) have been delivered and put into operation.
Fields of application: Suppliers of accessories to the car industry, electrical industry, plastic industry, yacht and boat builders, wherever laminated plastic and the like are produced or used as structural member.