Zenith Pumps B-9000 Gear Pumps

1 Zenith PumpsInstallation,Care and MaintenanceZenith Chemical DutyGear PumpsB- 9000 gear Pumps2 Zenith Thoroughly read and understand this entire manual before installation and operation of 1926, Zenith Pumps was approachedby the synthetic fiber industry to designa pump that would provide precise,pulseless and repeatable flow whileensuring ultimate product quality. Theoptions then were the same as those inthe chemical process industry today diaphragm, lobe, coarse gear , piston,plunger and screw Pumps . Each hasproblems with pulsation, flow inaccura-cies, multiple seal areas and slip, whichrequire constant calibration, high main-tenance and extended Pumps met the challengeand designed a rotary external gearpump of unique precision and techniques were devel-oped to hold tolerances to.

2 00005",minimizing internal clearances andassuring accurate and precise pump s simplistic design of onlythree moving parts two metering gearsand a drive shaft provided long lifeand reduced maintenance. For years, engineers have relied onZenith to provide precision fluid han-dling solutions for their most difficultpumping applications. Zenith gearpumps can be found wherever precise,pulseless,and repeatable meteringoffluids is Accuracy Stable, repeatableflows are assured even under varyingconditions of temperature, viscosity Construction Ground andlapped components allow for operatingclearances to.

3 00015" and provide highvolumetric Pulsation Unique designoffers virtually pulseless flow withoutvalves or flexible elements to hinder Flowmeter Concept Unparalleled mechanical precision,combined with the closed loop set pointaccuracy, ensures an exact volume per revolution without expensive Cost of Ownership With onlythree moving parts and 400 series stainless steel construction, the pumpprovides excellent corrosion resistancefor most chemical processes, and isthrough-hardened to 54 Rcor better formaximum life. Experience Zenith has over 74years of application experience withengineers available 24 hours a day tosupport your precision fluid (cc/rev): , , , , , , , 15, 30, 45, 90 Recommended Speed.

4 05 to 30 cc/rev, up to 500 RPM45 & 90 cc/rev, up to 300 RPMFlow Range:up to 27,000 cc/Minute, (7 GPM)Inlet Pressure: 300 psi (20 Bar) Pressure: 1000 psi (70 Bar) Pressure:20 to 1000 psi. (viscosity dependent)Temperature:0 F (-18 C) Minimum400 F (205 C) Maximum (with magneticcoupling seal)645 F (340 C) Maximum (dependant onshaft seal materials)Seals: Single Mechanical, Double Lip, Packed or MagneticRotation:Clockwise (CW) facing drive shaftPort Connections:Metric thread or SAE 61 Standard Optional Port Adapters:M12 X 1/4" NPT.. cc/rev1/2" SAE X 1/2" NPT.. cc/rev3/4" SAE X 3/4" NPT.

5 15 30 cc/rev1-1/4" SAE X 1-1/4" NPT.. 45 90 cc/revOptional Band heaters:150 Watt, 115 VAC .. cc/rev325 Watt, 115 VAC .. cc/rev650 Watt, 230 VAC .. 15 30 cc/rev1500 Watt, 230 VAC .. 45 90 cc/rev3 DesignZenith s B- 9000 series precision meter-ing Pumps utilize a rotary external spurgear which dispenses an exact volumeof fluid per shaft revolution (cc/rev). Precision ground and lapped con-struction, including alignment dowels,allows for close control of operatingclearances. This ensures precise, pulseless and repeatable flow undervarying process conditions. Integrated closed loop speed con-trol and a compact motor driver systemmaintains up to.

6 01% accuracy of setpoint speeds and also accepts automat-ed B- 9000 series is constructed of400 series stainless steel, providingexcellent bearing qualities (hardness 54Rc) and corrosion resistance for mostchemical processes. The pump offersincreased uptime while minimizing main-tenance due to its simple design of onlythree moving B- 9000 series is a new genera-tion of Zenith s traditional B- series maintaining precise flow charac-teristics, its optimum gear designreduces bearing loads, while increasingspeed capability. The pump allowsdirect piping and shaft engagement andincludes a single mechanical shaft seal,(other seal types available).

7 OperationFluid enters the pump through the inletport located in the front plate and fillsthe gear pocket. As the gears rotate, aprecise amount of fluid is trapped by theside walls of the gear pockets and gearteeth. The metered fluid is transported bythe rotation of the gears to the dischargeside of the pump where the gear teethcome into mesh. This action forces thefluid out of the gear teeth and throughthe outlet port located in the front pressure developed is determinedby the pump size, the gear clearances,pump speed, fluid viscosity and imped-ance to speed is limited by practicalconsiderations.

8 If a high viscosity fluid isbeing metered and pump speed isincreased beyond a certain point, thefluid may not be able to fill the gearteeth spaces, and the pump will notobtain enough fluid to maintain normalvolumetric efficiency. Lack of sufficientfluid is called starvation or can be remedied by increasing theinlet pressure or reducing pump table 1on page of thin fluids requires a different approach. Since the pumpdepends upon the metered fluid forlubrication of internal bearing surfaces,speeds are normally limited. Thesebearing surfaces include the bearingareas in the front and rear plates, andthe driver gear turning about the wear and even seizure maybe the result of high speeds, especiallyif attended by low lubricity or a fluidcontaining abrasive particles.

9 In certainapplications, it is recommended to use apump of larger capacity operated at alower speed. Contact our ApplicationsEngineering Department for efficiency depends on fourbasic variables: fluid viscosity, gearclearances, differential pressure andpump speed. The less viscous the fluid,the more likely it is to flow through agiven orifice. In a Zenith pump, this orifice is the gear clearance. Differentialpressure forces the fluid through thisclearance at a steady rate, regardless of the pump speed. Thus, the slip isconstant for a given amount of time. Theactual delivery of fluid is the measureddelivery minus the slip.

10 If we increasethe pump speed we increase the mea-sured delivery, while the slip remainsconstant, causing the pump to becomemore efficient. Likewise, if we slow thepump down, the pump becomes lessefficient. Slip is repeatable and pre-dictable, and pump operation can beadjusted to compensate and, thus,accuracy is very high. See Graph 1onpage B- 9000 series Pumps aredesigned for operating temperaturesless than 645 F. When operating at temperatures above ambient, heat jackets should be used, and pumpsshould be heated slowly and uniformlyto avoid warpage and internal 400- series stainless steels usedin the construction of the B- 9000 Seriespumps provide sufficient corrosion resistance for most standard chemicalprocesses.