Part B, Section 2 - Nordsonemanuals.nordson.com/adhesives/English_Manuals/b2en0205.pdf · 13. Adhesive charring in tank Adhesive in tank too hot Check the tank operating temperature

� 2000 Nordson CorporationAll rights reserved

41-3000Issued 11/00

B2EN-02-[3-PUMP]-5

Part B, Section 2

Pump

This section covers the following unit configurations.

Model 340035003700386038903960

Voltage 1, 2

Pump DC Gear (O, R, S, T, U, or W)

Manifold 4-Port (J or F)6-Port (K, L, O, or P)2-Port (R or U)

Control MultiScan (3)

PumpB 2-0


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Pump B 2-1


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Section B 2Pump

WARNING: Allow only qualified personnel to perform thefollowing tasks. Follow the safety instructions in this documentand all other related documentation.

This section includes troubleshooting procedures for adhesive applicationproblems and pump troubleshooting procedures and repair procedures.Refer to the Parts section for the part number of any pump componentthat needs to be replaced. If you try all the suggestions in this sectionand still cannot solve the problem, call your Nordson representative forassistance.

Refer to the Control System section for troubleshooting procedures andrepair procedures for the melter’s control system, including thekey-to-line (KTL) and motor and pressure control (MPC) features. Forhose or gun troubleshooting, refer to your hose or gun manual.

The following sections of this manual contain additional information onthe hydraulic system:

� Technical Data includes pump specifications.

� Maintenance includes a procedure for checking the pump motorspeed reducer.

� Tank and Manifold includes procedures for replacing the tank,manifold, drain valve, pressure relief valve, circulation controlvalve, and pressure control valve.

If your melter has any of the following options, refer to the Optionssection at the end of this manual for additional troubleshooting, repair,and parts information:

� Input/output (I/O) board� Low-level switch� Electric line filter� Pressure dump

1. Introduction

PumpB 2-2


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These troubleshooting tables describe the kinds of adhesive applicationand pump-operation problems you may encounter and provide correctiveactions for handling those problems. When necessary, the tables refer tomore detailed diagnostic procedures. Refer to the appropriatetroubleshooting table for the type of problem you are experiencing:

� Adhesive Not Applying Properly� Pump or Motor Not Working

Problem Possible Cause Corrective Action

1. Little or no adhesive output Melter not at operating temperature Wait for the time delay to expire andthe SYSTEM READY light to turn on.

Adhesive level too low Keep the tank at least half full ofadhesive. Refer to Adhesive Filling inthe Operation section.

Adhesive too cold Check the tank, hose, or gunoperating temperature setpoints andadjust them as necessary.

Motor speed and/or pressure controldials not properly set

Set the motor speed and/or pressurecontrol dials to the normal operatingsetting.

Clogged manifold filter Clean the manifold filter. Refer toCleaning a Manifold Filter in theMaintenance section.

Blockage in manifold Check for blockage. Refer toManifold Blockage Check.

Circulation control valve or pressurecontrol valve not properly set orclogged

Check the circulation control orpressure control valve. Refer tosystem flushing procedure for DCgear pump systems in the Installationsection to set up the valve.

Cold hose-to-melter or hose-to-gunjoints

Insulate the joints.

Guns not operating properly Refer to the gun manual totroubleshoot gun problems.

Manifold heat exchanger blocked Check manifold heat exchanger forblockage. Clean if necessary.

2. Troubleshooting Tables

Adhesive Not ApplyingProperly

Pump B 2-3


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2. Wavy beads Adhesive too cold Check the tank, hose, or guntemperature setpoints and adjustthem as necessary.

Ambient temperature below freezingor guns subject to draft

Protect the melter and guns fromfreezing temperature conditions anddrafts.

Nozzles too far from product Position the guns so the nozzles areno more than 13 mm (0.5 in.) fromthe product.

3. Excessive adhesive atbeginning of bead

Nozzles too far from product Position the guns so the nozzles areno more than 13 mm (0.5 in.) fromthe product.

Nozzles partially clogged Clean the nozzles. Refer to thenozzle cleaning procedure in the gunmanual.

4. Adhesive stringing Nozzle too far from product Position the guns so the nozzles areno more than 13 mm (0.5 in.) fromthe product.

Adhesive too viscous Change to a compatiblelower-viscosity adhesive.


Adhesive old Do not exceed the recommended potlife of the adhesive.

5. Concentric circles in bead Adhesive too hot Check the tank, hose, or gunoperating temperature setpoints andadjust them as necessary.

Adhesive not viscous enough Change to a compatiblehigher-viscosity adhesive.

6. Adhesive bouncing orsplashing from product

Adhesive too hot Check the tank, hose, or gunoperating temperature setpoints andadjust them as necessary.

Adhesive not viscous enough Change to a compatiblehigher-viscosity adhesive.

Nozzle orifice too large forapplication

Change to a nozzle with a smallerorifice.

Too much hydraulic pressure Decrease hydraulic pressure.

Continued on next page

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7. Adhesive not penetratingproduct


Special coating on product Increase operating temperaturesetpoints slightly or changeadhesives.

Not enough adhesive being applied Change to a higher-flow nozzle,increase operating temperaturesetpoints slightly, or increasehydraulic pressure.


8. Air or moisture in bead Adhesive level too low Keep the tank at least half full ofadhesive. Refer to Adhesive Filling inthe Operation section.


Product wet Preheat the product.

9. Adhesive gelling Changing to an adhesiveincompatible with the previousadhesive without first cleaning thesystem

Clean the system. Refer to Cleaningthe System in the Maintenancesection.

Flushing Type-R cleaning fluidthrough a system that was usingpolyamide, surlyn, polyester, orsome other high-performanceadhesive

Clean the system. Refer to Cleaningthe System in the Maintenancesection. If the gelled adhesive cannotbe pumped out, replace thetank/manifold assembly, hoses,and/or guns.

Adhesive heated for too long Clean the system. Refer to Cleaningthe System in the Maintenancesection. Do not exceed therecommended adhesive pot life.

Adhesive overheated Clean the system. Refer to Cleaningthe System in the Maintenancesection. Decrease the operatingtemperature setpoints.

Adhesive Not ApplyingProperly (contd)

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Problem Corrective ActionPossible Cause

10. Adhesive drooling from gun Guns not applying adhesive properly Refer to the gun manual totroubleshoot gun problems.

11. Cartons popping open Adhesive not cooling fast enough Decrease hydraulic pressure todecrease the bead size. Decreasethe operating temperature setpointsslightly. Reduce the line speedthrough the compression section.Increase the distance between thenozzles and the product. Increasethe distance between beadapplication and bead compression.Increase the length of thecompression section. Cool theproduct. Use a lower-flow nozzle.Use a stitched bead pattern.

Adhesive open time too long Change to an adhesive with a shorteropen time.

Adhesive cooling too fast Increase the hydraulic pressure toincrease the bead size. Increase theoperating temperature setpointsslightly. Decrease the distancebetween the nozzles and the product.Decrease the distance between beadapplication and bead compression.Heat the adhesive. Use a higher-flownozzle. Avoid stitched bead patterns.Protect the gun or bead from cold air.

Adhesive deposit shearing Check for twisting or other adversemovement during the compressionsection.

12. Adhesive fuming orsmoking

Adhesive in tank too hot Check the tank operating temperaturesetpoint and adjust it as necessary.

Unstable adhesive Keep the lid closed when the melteris operating. Change to a morestable adhesive.


PumpB 2-6


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13. Adhesive charring in tank Adhesive in tank too hot Check the tank operating temperaturesetpoint and adjust it as necessary.

Tank overheating Refer to the troubleshooting tables inthe Control System section.


Adhesive oxidizing in tank Keep the lid closed when the melteris operating. Change to a morestable adhesive. Switch to a melterwith a nitrogen blanket.

14. Bead size does not changewhen line speed changes(KTL and MPC only)

Air pressure to melter too low Increase the air pressure. Therecommended range is5.5–6.9 bar (80–100 psi).

Adhesive output exceeding adhesivemelt rate

Adjust the tank, hose, or guntemperature settings.


Nozzles clogged Clean the nozzles. Refer to thenozzle cleaning procedure in yourgun manual.

Adhesive Not ApplyingProperly (contd)

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WARNING: Risk of electrical shock. Failure to observeelectrical safety procedures may result in equipment damage,personal injury, or death. Allow only qualified personnel toperform electrical troubleshooting. Observe all high voltageindicators.


1. Pump not turning but motorrunning

Misaligned, damaged, or loose chainor damaged or worn sprockets

Check the motor chain and sprockets.Refer to Motor Chain and SprocketCheck.

2. Motor fails to start Melter not at operating temperature Wait for the time delay to expire andthe SYSTEM READY light to turn on.

Motor speed control dial set at 0 Change the setting.

Blown fuse Remove the electrical enclosure lidand check the input power neon onthe motor control interface board. Ifthe neon is off, replace the fuses.

Failed motor control interface board Measure the input voltage to themotor control board at J2-6 and J2-8on the motor control interface board.If you do not measure line voltage,replace the motor control interfaceboard.

Failed motor drive board Measure the voltage at the motordrive board A+ (red wire no. 31) andA- (black wire no. 31) wires. If thevoltage is less than 10 VDC, replacethe motor drive board.


Pump or Motor Not Working

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2. Motor fails to start (contd.) Loose wire nut connections Disconnect and lock out electricalpower to the melter. Remove thecover on the bottom of the motor andinspect the wire nuts connections.Tighten any loose connections.

Failed ribbon cable on motor controlboard

Disconnect ribbon cable no. 31 (redand black) from the motor controlboard and check the continuity. Ifthere is no continuity, replace theribbon cable. If there is continuity,replace the motor. Refer to Checkinga Ribbon Cable in the Control Systemsection.

Melters with I/O board: FailedI/O board

Check the status of the motor stopinput. If the status is not okay,change the I/O board input.

Failed ribbon cable between motorcontrol board and motor controlinterface boards

Check the continuity of the ribboncables between the motor controlinterface boards and the motorcontrol board. If there is nocontinuity, replace the ribbon cable.

Failed motor control board or motorcontrol interface boards

Disconnect the ribbon cable from amotor control interface board andmeasure the voltage on the ribboncable between positions 16 and 10. Ifthe voltage is 1.0–2.0 VDC, replacethe motor control interface board. Ifthe voltage is outside 1.0–2.0 VDC,replace the motor control board.

Pump or Motor Not Working (contd)

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Use these procedures as directed by the troubleshooting tables to furthertroubleshoot pump-operation problems.

Motor Chain and Sprocket Check

1. Remove the drive cover.

2. Check the chain and sprocket:

� Chain misaligned or sprocket worn: realign the chain or replacethe sprocket.

� Chain and sprocket okay: continue to the next step.

3. Disassemble the chain by taking out the removable chain link. Jogthe pump motor and see if the speed reducer output shaft rotates.

� Shaft does not rotate: Replace the speed reducer.

� Shaft rotates: continue to the next step.

4. Manually rotate the sprocket above the gear pump by pulling on thechain.

� Drive shaft does not rotate: drain the tank so the adhesive level islower than the pump mount. Remove the pump. Manually rotatethe sprocket. If the sprocket rotates, replace the pump. If thesprocket does not rotate, replace the bearings and pack withgrease.

� Drive shaft rotates: drain the tank so the adhesive level is lowerthan the pump mount. Remove the pump. Check the drive shaftcoupling. If the coupling is worn or damaged, replace it. If thecoupling is okay, replace the pump.

Troubleshooting Procedures

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Manifold Blockage Check

1. Stop the pump.

2. Standard manifold filter: Open the manifold drain valve.

Reverse-flush manifold filter: With the manifold filter in the RUNposition, open the right-side drain valve.

3. Start the pump.

� Adhesive flows: filter is clear and manifold is not blocked. Returnto the troubleshooting table.

� Adhesive does not flow: manifold may be blocked. Turn thepump off and remove the manifold filter. Check for blockage inthe manifold and remove any blockage. Clean the manifold filter ifnecessary. Refer to Cleaning a Manifold Filter in the Maintenancesection.

Use these procedures to replace the pump, to replace any pumpcomponent, or to clean pump components. Refer to the parts lists at theend of this section for the part numbers of any components that need tobe replaced. You can also use the parts list illustration as a guide as youperform the following procedures.

Follow this procedure to safely prepare for pump repairs.

1. Make sure the melter is at operating temperature.

2. Make sure the adhesive level in the hopper is lower than the pumpcavity.

3. Relieve hydraulic pressure. Refer to Relieving Hydraulic Pressure inthe Maintenance section.

4. Place the melter circuit breaker in the OFF position, disconnect andlock out electrical power to the melter at the branch circuit disconnectswitch, and disconnect and lock out electrical power supplied throughany I/O wiring.

3. Pump Procedures

Preparing for Repairs

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Follow this procedure to remove the pump assembly from the melter.

1. See Figure B 2-1. Remove the hopper and drive covers (1).

2. Remove the drive chain (3) as follows:

a. Loosen the speed reducer screws (5).

b. Remove the chain-tensioning screw (6).

c. Push the motor and speed reducer assembly in far enough to liftthe chain off the speed reducer sprocket (4).

d. Remove the screws and washers from the upper bearingmount (2) and remove the mount.

e. Remove the drive chain.

f. Reattach the upper bearing mount to the pump assembly.

3. Remove the screws, washers, and lock washers that secure thepump mount to the hopper mount. Lift the pump assembly out of themelter.

4130902A

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6

4

2

53

1

8 7

Fig. B 2-1 Removing the Pump from the Melter

1. Hopper and drive covers2. Upper bearing mount3. Drive chain

4. Speed reducer sprocket5. Speed reducer screw6. Chain-tensioning screw

Removing the Pump

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Follow this procedure to disassemble the pump .

1. See Figure B 2-2. Remove the bolts that secure the pump to thepump mount (1). Be careful not to lose the drive shaft coupling (4)and key (3).

2. Remove the return tube (7) and the crossover tube (5).

3. Check the crossover tube O-ring (6) for damage. Replace the O-ringif necessary.

NOTE: Nordson Corporation recommends replacing the crossovertube O-ring any time the pump is removed.

4130903A

3

4

6

7

1

5

2

Fig. B 2-2 Return Tube and Crossover Tube Components

1. Pump mount2. Key3. Pump mount insulator4. Coupling

5. Crossover tube6. Crossover tube O-ring7. Return tube

Disassembling the Pump

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WARNING: Risk of burns. Solidified adhesive may make thepump plates difficult to separate. If you need to heat the pumpplates, use an electric oven with forced-air circulation or aflameless electric heat gun. Do not use a torch or other openflame.

4. Disassemble the pump as shown in Figure B 2-3. Be careful not tolose the steel balls (2).

4130904A

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2 3

4

6

7

8

5

9

Fig. B 2-3 Pump Components

1. Drive shaft2. Steel ball (one of two)3. Bottom plate4. Center plate5. Spur gears

6. Idler shaft7. Top plate8. Socket-head screw (one of four)9. Dowel pins

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If necessary, follow this procedure to clean the pump components. If thecomponents are damaged, replace the entire pump.

WARNING: Risk of fire or explosion. Do not heat NordsonType-R cleaning fluid above 246 °C (475 °F). Do not heatcleaning fluid with an open flame or in an unregulated heatingdevice.

1. Use one of the following methods to heat the components:

� Place the components, except for O-rings, in a container ofType-R cleaning fluid and heat the fluid above the melting point ofthe adhesive.

� Use a flameless heat gun to heat the components, except forO-rings.

2. Scrub the components with a fine-bristled brush and wipe them with aclean, dry cloth.

Follow this procedure to reassemble the gear pump assembly.

1. Reassemble the pump components. See Figure B 2-3 for the properplacement of the shafts, gears, balls, pump plates, and dowel pins.

NOTE: The plates are marked T for top, C for center, and B forbottom. Use these markings to properly align the plates.

2. Screw the socket-head screws into the top of the pump. Tighten to19.78–20.91 N�m (175–185 in.-lb).

NOTE: The drive shaft must rotate a full revolution without binding ordragging before you tighten the screws. To ensure proper alignment,you may need to strike the side of the pump with a soft-face hammerwhile tightening the screws. After tightening the screws, a maximumof 0.56 N�m (80 in.-oz) of torque is required to turn the drive shaft ona clean pump.

3. Reattach the crossover tube and the return tube to the pump.

4. Attach the pump to the pump mount. The drive shaft must be free torotate after the pump is locked down. Tighten the hex-head screwsand washers to 6.78–9.04 N�m (60–80 in.-lb).

NOTE: Your pump may include a pump mount insulator. If so, placethe insulator between the pump and the pump mount.

Cleaning the PumpComponents

Reassembling the Pump

4131128A

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2

3

4

56

7

8

11

910

Pump B 2-15


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Follow this procedure to check the bearings and the seal and to replacethem if necessary. The pump assembly has two bearings, one in theupper bearing mount and one in the pump mount. The seal is housed inthe pump mount.

1. See Figure B 2-4. Remove the upper bearing mount (1).

2. Remove the drive shaft (5) from the pump mount (11).

3. Remove both bearings (2,8), the retaining ring (9), and the seal (10).

4. Inspect the bearings and the seal for damage and replace anycomponents as needed.

5. If you are installing a new seal, lightly lubricate the seal to protect itduring reassembly.

6. Press the seal into the pump mount. The seal’s open face should betowards the pump. Secure it with the retaining ring.

7. Pack both bearings with high-temperature grease and install them inthe upper bearing mount and pump mount.

NOTE: The bearings in the replacement kit are already pre-packedwith high-temperature grease.

8. Position the drive shaft coupling (7) and key (6) on the drive shaft.

9. Install the drive shaft. Take care not to mar, scratch, or cut the sealduring installation.

10. Reattach the upper bearing mount to the pump mount with thehex-head screws and washers you removed earlier.

Fig. B 2-4 Pump Bearing and SealComponents

1. Upper bearing mount2. Upper bearing3. Key4. Sprocket5. Drive shaft6. Key7. Coupling8. Lower bearing9. Retaining ring

10. Seal11. Pump mount

Note: Some items shown for referenceonly.

Checking the Bearing and theSeal

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Follow this procedure to reinstall the pump assembly and to reinstall andadjust the drive chain.

1. Check the pump gaskets for damage and replace if necessary. Thenposition the pump insulator, gaskets, and pan on the hopper mount.

2. Install the pump assembly on the hopper mount. Tighten thehex-head screws, washers, and lock washers to12.20–13.56 N�m (9–10 ft-lb).

3. Remove the upper bearing mount.

4. Install the drive chain. Tighten the chain-tensioning screw justenough to keep the chain on both sprockets.

5. Reinstall the upper bearing mount. Tighten the screws to6.78–8.14 N�m (5–6 ft-lb).

NOTE: If the pump is properly installed, you should be able to rotatethe drive shaft clockwise by exerting a maximum torque of0.56 N�m (80 in.-oz) or a maximum force of 62.5 oz. To measureforce, use a strain gauge to move the drive chain.

6. Adjust the drive chain slack as follows:

a. Adjust the height of the speed reducer sprocket so it is level withthe drive shaft sprocket.

b. With the chain attached to both sprockets and the speed reducerscrews snug but not tightened, adjust the chain-tensioning screwto obtain the chain-deflection dimensions shown in Figure B 2-5.Begin tightening the speed reducer screws that are closest to thechain-tensioning screw and check the chain tension. If the chainbecomes too tight, loosen the same screws and turn thechain-tensioning screw counterclockwise. Move the speedreducer to decrease the chain tension.

Reinstalling the Pump

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c. Tighten the screws again and recheck the chain tension.Continue this process until tension/deflection matches thedimensions shown in Figure B 2-5 when all four speed reducerscrews are tight. Tighten the screws to 6.78–8.14 N�m (5–6 ft-lb).Lock the chain-tensioning screw nut.

d. Recheck the speed reducer sprocket. Make sure the sprocket islevel with the drive shaft sprocket.

4130914A

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2

4.1–5.8 mm(0.16–1.23 in.)

2.0–2.9 mm(0.08–0.12 in.)

2.0–2.9 mm(0.08–0.12 in.)

Fig. B 2-5 Chain Tension/Deflection

1. Chain-tensioning screw 2. Tight chain

7. Reinstall the hopper and drive covers.

8. Restore the system to normal operation.

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Use these procedures to replace the motor, check the speed reducer oil,or replace the speed reducer. Refer to the Parts section for the partnumbers of any components that need to be replaced. You can also usethe parts list illustrations as a guide while performing the followingprocedures.

Follow this procedure to replace the motor.


2. See Figure B 2-6. Remove the drive cover.

3. Remove the motor conduit box cover and disconnect the electricalwires; then remove the conduit nut and separate the conduit andwires from the motor.

4. Disconnect the motor (1) from the speed reducer.

5. Remove the speed reducer coupling (2). Apply anti-seize lubricant toboth the reducer and motor shafts. Reinstall the speed reducercoupling.

4130906A

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1

Fig. B 2-6 Replacing the Motor

1. Motor 2. Speed reducer coupling

6. Attach the new motor to the speed reducer. Tighten the screws,washers, and lock washers to 6.78–8.14 N�m (5–6 ft-lb).

4. Motor and SpeedReducer Procedures

Replacing the Motor

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7. Attach the conduit to the motor conduit box. Connect the wires asshown in Table B 2-1.

Table B 2-1 Motor Wire Connections

Wire Number Connect to...

31 (red) A1

31 (black) A2

31 SH and G7 green ground wire

32 TH

39 TH

8. Reinstall the motor conduit box cover.

9. Reinstall the drive cover.


Follow this procedure to replace the speed reducer.

Speed Reducer Removal


2. See Figure B 2-7. Remove the drive cover (1).

3. Disconnect the motor (2) from the speed reducer (8). Do not hangthe motor by its conduit.

4. Remove the chain-tensioning screw and nut (11) and the four speedreducer screws (7) to separate the speed reducer from the spacers(9), the motor support bracket (10), and the adjusting bracket (12).

5. Remove the drive chain (3) from the speed reducer sprocket (5).

Replacing the Speed Reducer

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Speed Reducer Removal (contd)

6. Remove the speed reducer sprocket and key (6). Do not remove thecoupling (4) from the speed reducer.

7. Remove the speed reducer and attached coupling from the melter.

4130907A

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4

3

9

8

7

6

10

5

11

Fig. B 2-7 Speed Reducer Components

1. Drive cover2. Motor3. Coupling4. Drive chain5. Sprocket6. Key

7. Speed reducer screw8. Speed reducer9. Spacer

10. Motor support bracket11. Chain-tensioning screw and nut12. Adjusting bracket

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Speed Reducer Installation

1. Attach the sprocket and the key to the new speed reducer.

2. The speed reducer replacement kit has two sets of screws. Removethe screws and nuts from the new reducer and discard them. Insertthe longer screws in the replacement kit in the new speed reducer.

3. Align the spacers on the motor support bracket and position the newspeed reducer on top of the spacers.

4. Place the speed reducer adjusting bracket under the motor supportbracket and tighten the reducer screws finger tight.

5. Install the chain-tensioning screw and nut in the speed reduceradjusting bracket and motor support bracket.

6. Install the drive chain on the speed reducer sprocket. Tighten thechain-tensioning screw just enough to keep the chain on bothsprockets.

7. Remove the speed reducer coupling. Apply anti-seize lubricant toboth the speed reducer and motor shafts and place the coupling onthe reducer shaft.

8. Attach the motor to the new speed reducer. Tighten the screws,washers, and lock washers to 6.78–8.114 N�m (5–6 ft-lb).

9. Adjust the drive chain slack as follows:

a. Adjust the height of the speed reducer sprocket so it is level withthe drive shaft sprocket.

b. With the chain attached to both sprockets and the speed reducerscrews snug but not tightened, adjust the chain-tensioning screwto obtain the chain-deflection dimensions shown in Figure B 2-8.

c. Begin tightening the speed reducer screws that are closest to thechain-tensioning screw and check the chain tension. If the chainbecomes too tight, loosen the same screws and turn thechain-tensioning screw counterclockwise. Move the speedreducer to decrease the chain tension.

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Speed Reducer Installation (contd)

d. Tighten the screws again and recheck the chain tension.Continue this process until tension/deflection matches thedimensions shown in Figure B 2-8 when all four speed reducerscrews are tight. Tighten the screws to 6.78–8.14 N�m (5–6 ft-lb).Lock the chain-tensioning screw nut.

e. Recheck the speed reducer sprocket. Make sure the sprocket islevel with the drive shaft sprocket.

4130914A

1

2

4.1–5.8 mm(0.16–1.23 in.)

2.0–2.9 mm(0.08–0.12 in.)

2.0–2.9 mm(0.08–0.12 in.)

Fig. B 2-8 Chain Tension/Deflection

1. Chain-tensioning screw 2. Tight chain

10. Reinstall the drive cover.


Documents

Part B, Section 2 - Nordsonemanuals.nordson.com/adhesives/English_Manuals/b2en0205.pdf · 13. Adhesive charring in tank Adhesive in tank too hot Check the tank operating temperature