Burner Components Oil pump type RSA info/RSA Pumps.pdf · Danfoss A/S Burner Components Division operates a Quality- and Environmental Management System which has been certified to

Contents Application .................................................................................................................... page 2Construction ................................................................................................................. page 3Function ........................................................................................................................ page 4Technical data ............................................................................................................... page 6Capacity and operating torque RSA 28 ........................................................................ page 7Capacity and operating torque RSA 40 ........................................................................ page 8Capacity and operating torque RSA 60 ........................................................................ page 9Capacity and operating torque RSA 95 ........................................................................ page 10Capacity and operating torque RSA 125 ...................................................................... page 11Schematic build-up ....................................................................................................... page 12Dimensions ................................................................................................................... page 13Installation ..................................................................................................................... page 15First-time start ............................................................................................................... page 15Code numbers .............................................................................................................. page 15Accessories ................................................................................................................... page 16Service kit ..................................................................................................................... page 16

Oil pump type RSA

Catalogue 1

Burner Components

520F0104 DKBG.PK.013.C3.02 1

Catalogue Oil pump type RSA

2 520F0104 DKBG.PK.013.C3.02

Application The RSA series oil pumps are designed and manufactured to meet market requirements ofhigh 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 andgas oils.

The RSA series can also be used for other media having a corresponding or higherclassification. 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 feedsystems, 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 neckshoulder 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 mm2/sSpeed 2800 r/min

Type RSA 28: Output 51 l/hType RSA 40: Output 82 l/hType RSA 60: Output 111 l/h

and two are defined at:Operating pressure 10 bar*Oil viscosity 4.3 mm2/sSpeed 2800 r/min

Type RSA 95: Output 184 l/hType RSA 125: Output 275 l/h

* 1 bar = 100 kPa

Quality- andEnvironmentalManagement System

ISO9001

ISO14001

Danfoss A/S Burner Components Divisionoperates a Quality- and Environmental Management System which has beencertified to ISO 9001 and ISO 14001.


520F0104 DKBG.PK.013.C3.02 3

Construction Pumps in the RSA series are of modular construction so that the pump housing with its shaftseal and valve systems are identical for all five types. The pump system itself varies with thepump size and direction of rotation.

RSA 28, 40 and 60 pumps, designed for lower capacity duties, use gearwheel sets with singleoil feed inlets and outlets where only one shaft bearing is needed. These pumps all have thesame 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 twoshaft bearings (fig. 3). The dual oil feed inlets and outlets allow these larger pumps to maintainthe 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 thebearings, ensures minimum wear for all moving parts.

RSA pumps are equipped with a hydraulic regulation and cut-off valve and are designed foruse on burners with one, two or multi-stage operation where a solenoid or other form of valveblock system is installed in the nozzle line.

The RSA series of pumps have manual changeover between one and two-pipe operation(fig. 1).

The shaft seal is designed to give maximum protection against oil seepage under both staticand dynamic load. The actual design of the seal is different on clockwise and counterclockwisepumps.

1-pipe 2-pipe

Fig. 1


4 520F0104 DKBG.PK.013.C3.02

Function When the pump is started, oil is drawn through suction port S via filter H to the gearwheel setC 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 Vwhich opens when the set pressure is reached. The pressure is controlled and maintainedconstant by regulating valve V. At the same time the gearwheel set distributes the oil throughnozzle 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 regulatingvalve 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 screwA must be removed to give free flow to the suction side via bypass G (figs. 1, 2, 3) with returnport 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 underthe given conditions, the oil pressure falls below the set value because the regulating valvepiston 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!


520F0104 DKBG.PK.013.C3.02 5

RSA 28 - 40 - 60

Fig. 2

RSA 95 - 125

Fig. 3


6 520F0104 DKBG.PK.013.C3.02

Technical data

Type RSA 28 40 60 95 125Viscosity range meas. in suct. connect. mm2/s C 1.3 - 18Filter area total cm2 75 170Mesh µm 150 150Speed min-1 2400-3600 1400 - 3600Pressure rangewith viscosity 1.3-1,8 mm2/s bar 5.5 - 12 5.5 - 12with viscosity 1.8-18 mm2/s 5.5 - 15 5.5 - 21Factory setting bar C, D 7 ± 1 10 ± 1Alt. pressure range with special spring bar 1 - 5Pressure variation on start and restart C, D max. 5 % of set pressureStarting torque max. Nm C 0,20 0.22 0.24 0.30 0.35Power consumption W A,B,C 63 70 89 161 211Gearwheel capacity l/h A,C 66 94 142 225 294 Capacity C fig. 4 fig. 6 fig. 8 fig. 10 fig. 12Operating torque C fig. 5 fig. 7 fig. 9 fig. 11 fig. 13Temperature of medium °C -10 to +70Max. permissible press. on suction & return side bar 4

Max. underpressure on suction side bar 0.5Recommendation: Maintain under 0.4 bar to prevent air/gas separation

Weight kg 1.9 2.3Ambient temperature °C -20 to +70Storage temperature °C -25 to +70

A Power consumption and gearwheel capacity are specified as follows:RSA 28 - 40 - 60: 7 bar, 4.3 mm2/s and 2800 r/minRSA 95 - 125: 10 bar, 4.3 mm2/s and 2800 r/minGearwheel cap. = output + return oil quantity

B Conversion factor, operating torque to power consumption and vice versa:T = operating torque in NmP = power in kWn = speed, r/min

PT = 9550 × [Nm]

nT × n

P = [kW]9550

C Viscosity. The pump capacity and power consumption requirement is a function of theviscosity of the oil in the gearwheel set and in the various bearings and running surfaces ofthe pump. This viscosity is not necessarily the same as the viscosity of the oil in the storagetank, 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 cooledconstantly 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 powerconsumption increases as a consequence of a temperature rise in the pump. If the pump isbuilt in, e.g. in a unit where the ambient temperature is high, the oil temperature will risefurther and this will produce a larger drop in the viscosity of the oil in the gearwheel set andbearings. The result will be significant changes in capacity and power consumption.These changes can be determined from measurements taken on the pump or from ambienttemperature measurement. In high ambient temperatures the oil in the pump will assumethe same or a slightly higher temperature. Therefore, using the value obtained, it is easy todetermine the actual viscosity. For example, the viscosity of standard fuel oil at 70°C fallsto about 2 mm2/s. The diagrams that follow illustrate the influence of viscosity on capacityand power consumption.

D Pressure regulation and pressure fluctuation are specified at 4.3 mm2/s. When changing toan other viscosity minor deviations may occur.


520F0104 DKBG.PK.013.C3.02 7

Capacity RSA 28

Fig. 4

Operating torque RSA 28

Fig. 5

Capacity andoperating torque


8 520F0104 DKBG.PK.013.C3.02

Capacity RSA 40


Fig. 7


Fig. 6


520F0104 DKBG.PK.013.C3.02 9

Capacity RSA 60

Fig. 9


Fig. 8



10 520F0104 DKBG.PK.013.C3.02

Capacity RSA 95

Fig. 11


Fig. 10



520F0104 DKBG.PK.013.C3.02 11

Capacity RSA 125

Fig. 13


Fig. 12



12 520F0104 DKBG.PK.013.C3.02

Scematic build-up

RSA 28 - RSA 40 - RSA 60

Fig. 14

RSA 95 - RSA 125

Fig. 15


520F0104 DKBG.PK.013.C3.02 13

Dimensions

RSA 28 - RSA 40 - RSA 60

Fig. 16


14 520F0104 DKBG.PK.013.C3.02

Dimensions

RSA 95 - RSA 125

Fig. 17


520F0104 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 theextra suction port.

Bleeding on starting up, especially in one-pipe systems, must be performed via the nozzlepressure measurement port. In two-pipe systems the pump is self-priming, i.e. bleeding isperformed via the return line.

If the pump is installed in a one-pipe system with underlying tank, the nozzle line should beconnected to the nozzle pressure measurement port to ensure reliability. That is to say, theclosing function of the regulating valve must be made inoperative and the nozzle nippleplugged. 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.

When starting up a system with empty pipes, the RSA pump should not be run without an oilsupply for more than 5 minutes, assuming the pump contains oil either from the factory or fromthe previous operating period. If this is not the case, the pump must be primed with oil.

First-time start

Code numbers 1-pipe 2-pipeType Shaft

Clockwise C/clockwise Clockwise C/clockwise

RSA 28 8 mm - - 070-5332 070L533210 mm 070-5370 070L5370 070-5372 070L5372

7/16" 070-5380 070L5380 070-5382 070L5382

RSA 40 8 mm - - 070-3249 070L324910 mm 070-3230 070L3230 070-3232 070L3232

7/16" 070-3240 070L3240 070-3242 070L3242

RSA 60 10 mm 070-3350 070L3350 070-3352 070L33527/16" 070-3360 070L3360 070-3362 070L3362

RSA 95 10 mm 070-3470 070L3470 070-3472 070L34727/16" 070-3480 070L3480 070-3482 070L3482

RSA 125 10 mm 070-3400 070L3400 070-3402 070L34027/16" 070-3410 070L3410 070-3412 070L3412

The direction of rotation is given viewed on the shaft.See fig. 18 (A = counterclockwise, B = clockwise).

Fig. 18


16 520F0104 DKBG.PK.013.C3.02

Acessories A loose flange with four screws is available for the RSA series. The flange is for mounting onthe pump neck shoulder.

Code number: 070-0211

A special pressure regulating spring is available for the RSA series. The spring changes the pressure rangeto 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 labeldesignating the range, 1 - 5 bar.

The spring must be fitted as shown on the accessory bag and figs. 14 and 15, page 12, toreplace the original compression spring in the pump.

Code number of accessory bag: 070-0030

Service kit Type RSA 28 40 60 95 125

Filter set no. 070-0032 070-0033

Danfoss can also offer pumps with capacities from 240 kW to 25.000 kW.

Produced by Danfoss G1 advertising agency 02.02 FO-Bi.SIL

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 toproducts 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.

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Burner Components Oil pump type RSA info/RSA Pumps.pdf · Danfoss A/S Burner Components Division operates a Quality- and Environmental Management System which has been certified to