Oil pump type RSA. Catalogue 1. Burner Components

Transcription

1 Burner Components Catalogue 1 Contents Application... page 2 Construction... page 3 Function... page 4 Technical data... page 6 Capacity and operating torque RSA page 7 Capacity and operating torque RSA page 8 Capacity and operating torque RSA page 9 Capacity and operating torque RSA page 10 Capacity and operating torque RSA page 11 Schematic build-up... page 12 Dimensions... page 13 Installation... page 15 First-time start... page 15 Code numbers... page 15 Accessories... page 16 Service kit... page F0104 DKBG.PK.013.C3.02 1

2 Quality- and Environmental Management System ISO 9001 ISO Danfoss A/S Burner Components Division operates a Quality- and Environmental Management System which has been certified to ISO 9001 and ISO Application The RSA series oil pumps are designed and manufactured to meet market requirements of high quality and a high degree of functional and operating reliability. The RSA series can be used for most light mineral fuel oils such as paraffins, kerosene and gas oils. The RSA series can also be used for other media having a corresponding or higher classification. The RSA series is suitable for small and medium size central heating systems, industrial burners and process plant. The RSA series can be adapted for use as a feed pump in, for example, annular pipe or feed systems, by replacing the standard compression spring with a special spring. The RSA series includes a loose flange as an accessory. This can be screwed onto the neck shoulder to make the pump fully interchangeable with other makes of pumps. The RSA series consists of five sizes of pump. Three of them are defined at: Operating pressure 7 bar* Oil viscosity 4.3 mm 2 /s Speed 2800 r/min Type RSA 28: Output 51 l/h Type RSA 40: Output 82 l/h Type RSA 60: Output 111 l/h and two are defined at: Operating pressure 10 bar* Oil viscosity 4.3 mm 2 /s Speed 2800 r/min Type RSA 95: Output 184 l/h Type RSA 125: Output 275 l/h * 1 bar = 100 kpa 2 520F0104 DKBG.PK.013.C3.02

3 Construction Pumps in the RSA series are of modular construction so that the pump housing with its shaft seal and valve systems are identical for all five types. The pump system itself varies with the pump size and direction of rotation. RSA 28, 40 and 60 pumps, designed for lower capacity duties, use gearwheel sets with single oil feed inlets and outlets where only one shaft bearing is needed. These pumps all have the same external dimensions and utilies the same filters. Nozzle line connection are G 1 /8. RSA 95 and 125 pumps have hydraulically balanced, deeper gearwheel sets requiring two shaft bearings (fig. 3). The dual oil feed inlets and outlets allow these larger pumps to maintain the high throughput effiency of the smaller units. They are fitted with larger filters and covers. Nozzle line connections are G 1 /8 for RSA 95 and G 1 /4 for RSA 125. The well proven form of the gearwheel set together with the pressurised lubrication of the bearings, ensures minimum wear for all moving parts. RSA pumps are equipped with a hydraulic regulation and cut-off valve and are designed for use on burners with one, two or multi-stage operation where a solenoid or other form of valve block system is installed in the nozzle line. The RSA series of pumps have manual changeover between one and two-pipe operation (fig. 1). 1-pipe 2-pipe Fig. 1 The shaft seal is designed to give maximum protection against oil seepage under both static and dynamic load. The actual design of the seal is different on clockwise and counterclockwise pumps. 520F0104 DKBG.PK.013.C3.02 3

4 Function When the pump is started, oil is drawn through suction port S via filter H to the gearwheel set C suction side (figs. 2 and 3). From here the gearwheel set pumps the oil to the pressure side. At the same time the oil becomes pressurized. The oil is led to cut-off and regulating valve V which opens when the set pressure is reached. The pressure is controlled and maintained constant by regulating valve V. At the same time the gearwheel set distributes the oil through nozzle port P and pump return side R via the shaft seal F. The quantity of oil supplied to nozzle port P is determined by the pressure set on regulating valve V and the oil nozzle/resistance in the nozzle line. In two-pipe systems the oil is returned direct to the oil tank. In one-pipe systems setting screw A must be removed to give free flow to the suction side via bypass G (figs. 1, 2, 3) with return port R closed. When the pump is stopped, pump output drops and produces a drop in the oil pressure. The spring in the regulating valve presses the regulating piston forward until it seats in port P. This cuts of the oil flow to the nozzle and ensures that the nozzle line is effectively shut off. If the pump is overloaded, i.e. more oil is demanded than the gearwheel is able to pump under the given conditions, the oil pressure falls below the set value because the regulating valve piston moves towards its closed position and partially or wholly cuts off return oil via port O. This condition can be remedied by: reducing the pump pressure! educing the capacity, i.e. smaller oil nozzle or greater resistance! changing to a pump with higher capacity! 4 520F0104 DKBG.PK.013.C3.02

5 RSA Fig. 2 RSA Fig F0104 DKBG.PK.013.C3.02 5

6 Technical data Type RSA Viscosity range meas. in suct. connect. mm 2 /s C Filter area total cm Mesh µm Speed min Pressure range with viscosity 1.3-1,8 mm 2 /s bar with viscosity mm 2 /s Factory setting bar C, D 7 ± 1 10 ± 1 Alt. pressure range with special spring bar 1-5 Pressure variation on start and restart C, D max. 5 % of set pressure Starting torque max. Nm C 0, Power consumption W A,B,C Gearwheel capacity l/h A,C Capacity C fig. 4 fig. 6 fig. 8 fig. 10 fig. 12 Operating torque C fig. 5 fig. 7 fig. 9 fig. 11 fig. 13 Temperature of medium C -10 to +70 Max. permissible press. on suction & return side bar 4 Max. underpressure on suction side bar 0.5 Recommendation: Maintain under 0.4 bar to prevent air/gas separation Weight kg Ambient temperature C -20 to +70 Storage temperature C -25 to +70 A Power consumption and gearwheel capacity are specified as follows: RSA : 7 bar, 4.3 mm 2 /s and 2800 r/min RSA : 10 bar, 4.3 mm 2 /s and 2800 r/min Gearwheel cap. = output + return oil quantity B Conversion factor, operating torque to power consumption and vice versa: T = operating torque in Nm P = power in kw n = speed, r/min T = 9550 P n [Nm] P = T n 9550 [kw] C Viscosity. The pump capacity and power consumption requirement is a function of the viscosity of the oil in the gearwheel set and in the various bearings and running surfaces of the pump. This viscosity is not necessarily the same as the viscosity of the oil in the storage tank, i.e. the viscosity of the supplied oil. In practice this factor is of no significance in a two-pipe system because the pump is cooled constantly in the intermediate tank and by the oil circulation in the pump. In a one-pipe system, the maximum capacity of the pump reduces and the power consumption increases as a consequence of a temperature rise in the pump. If the pump is built in, e.g. in a unit where the ambient temperature is high, the oil temperature will rise further and this will produce a larger drop in the viscosity of the oil in the gearwheel set and bearings. The result will be significant changes in capacity and power consumption. These changes can be determined from measurements taken on the pump or from ambient temperature measurement. In high ambient temperatures the oil in the pump will assume the same or a slightly higher temperature. Therefore, using the value obtained, it is easy to determine the actual viscosity. For example, the viscosity of standard fuel oil at 70 C falls to about 2 mm 2 /s. The diagrams that follow illustrate the influence of viscosity on capacity and power consumption. D Pressure regulation and pressure fluctuation are specified at 4.3 mm 2 /s. When changing to an other viscosity minor deviations may occur F0104 DKBG.PK.013.C3.02

7 Capacity and operating torque Capacity RSA 28 Fig. 4 Operating torque RSA 28 Fig F0104 DKBG.PK.013.C3.02 7

8 Capacity and operating torque Capacity RSA 40 Fig. 6 Operating torque RSA 40 Fig F0104 DKBG.PK.013.C3.02

9 Capacity and operating torque Capacity RSA 60 Fig. 8 Operating torque RSA 60 Fig F0104 DKBG.PK.013.C3.02 9

10 Capacity and operating torque Capacity RSA 95 Fig. 10 Operating torque RSA 95 Fig F0104 DKBG.PK.013.C3.02

11 Capacity and operating torque Capacity RSA 125 Fig. 12 Operating torque RSA 125 Fig F0104 DKBG.PK.013.C

12 Scematic build-up RSA 28 - RSA 40 - RSA 60 Fig. 14 RSA 95 - RSA 125 Fig F0104 DKBG.PK.013.C3.02

13 Dimensions RSA 28 - RSA 40 - RSA 60 Fig F0104 DKBG.PK.013.C

14 Dimensions RSA 95 - RSA 125 Fig F0104 DKBG.PK.013.C3.02

15 Installation In addition to the direction of rotation, the pump label designates the connection ports: S = suction line (2-off) R = return line (2-off) The pump also has a port for measuring nozzle pressure. Vacuum can be measured on the extra suction port. Bleeding on starting up, especially in one-pipe systems, must be performed via the nozzle pressure measurement port. In two-pipe systems the pump is self-priming, i.e. bleeding is performed via the return line. If the pump is installed in a one-pipe system with underlying tank, the nozzle line should be connected to the nozzle pressure measurement port to ensure reliability. That is to say, the closing function of the regulating valve must be made inoperative and the nozzle nipple plugged. In this application a cut-off valve must be installed in the nozzle line. A prefilter should be used in the installation, in accordance with current rules/practice. Information on the determination of maximum lengths of suction lines is given in our catalogue: Suction line tables for light oil pumps. First-time start When starting up a system with empty pipes, the RSA pump should not be run without an oil supply for more than 5 minutes, assuming the pump contains oil either from the factory or from the previous operating period. If this is not the case, the pump must be primed with oil. Code numbers 1-pipe 2-pipe Type Shaft Clockwise C/clockwise Clockwise C/clockwise RSA 28 8 mm L mm L L /16" L L5382 RSA 40 8 mm L mm L L /16" L L3242 RSA mm L L /16" L L3362 RSA mm L L /16" L L3482 RSA mm L L /16" L L3412 The direction of rotation is given viewed on the shaft. See fig. 18 (A = counterclockwise, B = clockwise). Fig F0104 DKBG.PK.013.C

16 Acessories A loose flange with four screws is available for the RSA series. The flange is for mounting on the pump neck shoulder. Code number: A special pressure regulating spring is available for the RSA series. The spring changes the pressure range to 1-5 bar so that the same pump can be used as a transfer or feed pump. The special spring is supplied in an accessory bag containing one spring and a self-adhesive label designating the range, 1-5 bar. The spring must be fitted as shown on the accessory bag and figs. 14 and 15, page 12, to replace the original compression spring in the pump. Code number of accessory bag: Service kit Type RSA Filter set no Danfoss can also offer pumps with capacities from 240 kw to kw. Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without subsequential changes being necessary in specifications already agreed. All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved F0104 DKBG.PK.013.C3.02 Produced by Danfoss G1 advertising agency FO-Bi.SIL