Agitator User Manual

www.gnsolidscontrol.com

GN Mud Agitator Installation, Operation & Maintenance Manual

Company name: GN Solids Control Co., Ltd. Website: http://www.gnsolidscontrol.com Address: No.3 Industry Road, Dachang Chaobai River Development Area, Langfang, China. Zip Code: 065300 E-mail: [email protected] [email protected] Tel: +86-316-5276988 / 5276989 / 5276990 Fax: +86-316-5276997 / 5276990

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Content 1. Overview 2. Safety instructions 3. Application, structure & features Application Features 4. Structure and operation principle Major components Drive Motor Gear Drive 5. Model selection and installation Sizing Installation Leveling Gearbox mounting plate Shaft assembly Impeller assembly Motor and gearbox assembly and installation Gearbox and impeller coupling connection Gearbox lubricant level 6. Electrical connections 7. Storage & handling

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8. Machine start up & shutdown Initial startup Normal startup and operation Normal shutdown procedure Emergency shutdown 9. Maintenance General Routine maintenance 10. Troubleshooting 11. Recommended spare parts 12. Terms of warranty

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1. Overview This manual provides installation, operation, and maintenance instructions for GN mud agitators. The manual is divided into several parts to assist the user inreadily accessing the information.

Personnel responsible for transporting, installing, commissioning, operating, or performing maintenance on this equipment are required to read and understand the instructions provided in this manual. One copy of this manual should be available and accessible at the equipment location.

For machine safety and performance, no additions and/or changes may be made to the equipment without the explicit written permission of GN Solids Control. Genuine GN repair/replacement parts are required 。

Fig. 1-1:

GN agitator (Welding type impeller)

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Fig.1-2

GN agitator （Casting type impeller ）

2. Safety instructions All persons responsible for operation and maintenance of this equipment must read and understand all safety information in this manual prior to operating and/or maintaining the equipment. The safety warnings listed below are included in applicable procedures throughout this manual.

a. While operating agitator without/with load, add qualified lubricating oil to required oil level into worm gearbox. b. To ensure proper balance and orientation when unit is raised and prevent damage to components, attach lifting sling only between motor and gear drive. Do not attempt Lifting by attachment to eyebolt on motor or any other Location. c. Be sure that handling devices have sufficient lifting capacity to safely handle the weight of the equipment. d. Clarify the correct direction of agitator before usage. e. To avoid serious personal injury of un-expected motor startup, be sure equipment is locked out, tagged out, and de-energized prior to install / or maintenance and/or

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adjustments.

DO NOT operate the equipment if defective or faulty mechanical or electrical components are detected.

3. Application, structure & features Application GN JBQ series mud agitator is one of the important equipment for mud system. It is mainly used for agitating drilling fluids, avoid particle in fluids deposit to tank bottom. It is high-efficiency mud-mixing units offered in a wide array of custom sizes and configurations to accommodate virtually any mud tank. The horizontal drive is designed for installations having limited space above the mud tank.

The mud agitator stirs mud slurry to maintain suspension of solids. The agitator is mounted on top of the mud tank and has one or two impeller(s) immersed in the mud slurry. The impeller shaft is directly coupled to an electric drive motor that is available in several horsepower ratings from 7.5 to 25.

GN does not authorize any other use of this equipment, intended usage of the equipment includes compliance with the operating, maintenance, and safety instructions provided in this manual。

Mud agitator design should be based on tank dimension, inner depth and mud condition. GN horizontal agitators utilize worm gear reducer. Welding type or casting type impeller for option. The impeller is fixed to the shaft with bolts to avoid rotating or sway (connection with key groove optional). Its vertical location on the shaft is determined as a height from the tank bottom corresponding to the impeller diameter times 0.75. For example, a 20” impeller should be mounted 15” above the bottom. GN recommends straight impeller blades for

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tanks under 5’ deep and canted blades for deeper tanks. If dual impellers are desired, straight blades are mounted on the bottom and the canted blade impeller is installed at a point about two-thirds above the tank bottom.

The keyed motor and driven impeller shafts are rigidly connected by a multi-piece coupling, which uses tapered locking bushings to secure the shafts together. Shaft lengths are customized to suit customer specifications. For shafts longer than 8’, a stabilizer is mounted on the tank bottom to support the lower end of the shaft.

Features a. Utilize worm gear reducer. Compact design, perfect joggle and reliable operation. b. Worm gear reducer combined with explosion-proof motor, which enable stable performance in wild severe environment. c. Input shaft of explosion-proof motor are connected to gearbox with elastic coupling directly, rather than belt-drive. It enables stable speed of impeller. d. The mud agitators are high-efficiency mud-mixing units offered in a wide array of custom sizes, and configurations to accommodate virtually any mud tank. It is to avoid over-load of current during start up motor. e. Horizontal type of motor. It is convenient for installation, adjustment or replacement. Main parameters of agitator JBQ5.5

JBQ7.5

JBQ11

JBQ15

5.5kw(7.5hp)

7.5kw(10hp)

11kw(15hp)

15kw(20hp)

60/72RPM

60/72RPM

60/72RPM

60/72RPM

Single-layer impeller, welding type (Standard)

850mm

950mm

1050mm

1200

Double- layer impeller, welding type

N/A

Up:800mm Down:800mm

Up:850mm Down:850mm

Up:950mm Down:950mm

Model Motor power Impeller speed

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(Standard)

Casting type impeller, (Standard) Ration Overall dimension (L*W*H) Electric Specs

600mm

700mm

Up:600mm Down:600mm

Up:700mm Down:600mm

25:1

25:1

25:1

25:1

900*700*600m m

900*750*610mm

1100*840*705m m

1200*1000*760m m

380V/50HZ Or 460V/60HZ, or customized

Shaft length and Customized shaft according to tank inner depth / mud condition optional impeller Explosion-proof motor Shaft stabilizer available Customized impeller diameter available

Remarks

4. Structure and operation principle Major components GN mud agitator is made of explosion-proof motor, worm gear reducer. impeller, mounting plate, elastic coupling, and rigid coupling. Explosion-proof motor and worm gear reducer installed on mounting plate. Elastic coupling connect explosion-proof motor input shaft and gearbox input shaft. Impeller shaft and gearbox output shaft are connected by rigid coupling. Although the arrangement mud agitator components is identical across the various sizes and configurations, the drive motor, impeller, shaft length and diameter, gear drive, and motor orientation vary between models. Figure 2 shows the typical components of a mud agitator. The configuration for the same power rati ng is identical, except for the type of ear drive. The unit is shipped unassembled and requires assembly by a trained, qualified technician.

No 1

Items Motor & worm gear reducer

Series No. GNJBQ150-01

Specs Assembly unit

Qty 1

Remarks

8


2 3

4 5 6

component 700mm impeller Impeller installation nut Impeller installation spring washer Impeller installation flat washer. Impeller installation bolt Shaft Shaft installation bolt Stabilizer

GNJBQ110-02 LM1400048S1

ZG35# SUS316

1 2

TD1400048S1

SUS316

8

PD1400048S1

SUS316

8

LS1414048S1

SUS316

8

GNJBQ055-03 LS1407048S1

Assembly 1 unit SUS316 6

GNJBQ055-04

SUS316

1

Fig.2: Main components of agitator

Drive Motor The mud agitator is operated by a 3-phase induction motor. Drive motors range from 7.5 to 9


25 horsepower with customized hz and voltage; the power requirements are specified on the customer order. Electric power, switching, and safet y devices are provided by the customer. GN can offer starter for agitator as request. All components come from Siemens of Schneider.

Gear Drive Rotation of the drive motor is transferred to the impeller shaft through the directly coupled gear drive. The drive is a reduction gearbox and is factory assembled to the drive motor. The drive is sized to apply the maximum torque required to produce the des ign impeller rotation speed of 60 rpm under 50hz, and 72 rpm under 60hz.

Impeller Impellers are available in diameters ranging from 20” to 52” to meet the needs of various size mud tanks. The impeller diameter is generally determined by the size of the tank. Larger or deeper tanks employ dual impeller units having a secondary impeller mounted closer to the mud surface. The impeller is mounted on the shaft using a tapered locking bushing. A bolt / key inserted in the impeller shaft locks the impeller to the shaft and prevents rotation. Canted impeller blades are desirable near the bottom of tanks more than 5’ deep or where other forces of flow factor may be absent in the tank. Welded type impeller

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Casting type impeller

Fig.3: Impeller type

5. Model selection and installation Before installation / disassembly, read and understand ALL safety information presented in this manual and associated documents. Review the equipment handling procedures in the manual. Pay particular attention to information concerning “lift points” and the use of spreader bars before lifting or moving the equipment. Failure to observe proper equipment handling procedures may result in serious personal injury and/or damage to the equipment.

Sizing For proper mixing and suspension of solids, the mud agitator must be properly sized and installed. To properly size a mud agitator, proceed as follows: 1. Select desired style – horizontal with welded / casting impeller 2. Determine available electric power - 440V/460V/380 ，60HZ , 380V/400V/415V ，50HZ or customized. 3. Select horsepower and impeller(s) as determined by the following factors: a. Tank design - round or square b. Tank dimensions c. Maximum mud weight d. Desired turnover ratio (TOR)

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After gathering the required information, the agitator can be properl y sized to meet the horsepower demand and correct agitation for the applicati on. To ensure accurate sizing, GN recommends clients to communicate with GN people to make sure s ize and model.

Following are operational recommendations for mud agitators: 1. Maintain uniform tank dimensions, i.e. equal width-to-length ratio or as close as possible to equal. 2. Avoid TOR values greater than 85 seconds, as this may jeopardize solids suspension. 3. Avoid TOR values less than 40 seconds, as this may result in formation of a vortex and increase air entrapment.

Installation Following are the sequential steps of the mud agitator installation procedure. The sequence presented is a guideline and may vary depending on the user’s facilities, previous experience with this equipment, and optional equipment. 1. Read and understand all safety information & handling procedures in this manual, and identify the mud agitator components. 2. Locate and weld mounting plate and stabilizer (if required) to tank structure. 3. Place shaft in tank, and assemble impeller(s), tapered bushings, and male coupling on shaft. 4. Install female coupling on gearbox shaft. 5. Install motor and gearbox assembly, and attach shaft coupling to gearbox coupling. 6. Connect electric power supply to drive motor.

Leveling To prevent undue premature wear on the gearbox or coupling and ensure long-term reliability and efficiency of the mud agitator, the impeller shaft should rotate in a true vertical orientation. This vertical installation is achieved by ensuring that the mounting plate is absolutely horizontal. If a stabilizer is used, it must be directly aligned with the

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center of the mounting plate. The following paragraphs describe the correct methods for installing the mounting plate and stabilizer. Agitator mounting dimension as showed as following.

Fig.4: Agitator on the tank

Motor Power

5.5kw

7.5kw

11kw

15kw

A

640

640

690

770

B

700

700

750

840

S/C

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C

290

290

320

370

D

350

350

394

440

E

∅22

∅22

∅22

∅22

F

595

595

657

700

G

903

903

1031

1133

H

97

97

97

115

Fig. 5 Agitator mounting dimension

Gearbox mounting plate The mounting location must be determined before the gearbox is installed. When sel ecting the mounting plate location, ensure that sufficient clearance is provided between the impeller blades and the tank wall. Use a level to ensure absolute, horizontal orientation of the mounting plate in two perpendicular directions. Select shims as needed to achieve level mounting, mark the position of shims, and then remove the plate from the tank as it must 14


be placed onto the gearbox shaft before installing the female coupling.

If impeller shaft is more than 8’ long, a stabilizer is required to support the lower end of the shaft. Install the stabilizer as follows: 1. Drop a plumb line through the center of the mounting plate to locate the exact center position of the stabilizer on the tank floor. 2. After determining its proper location, weld the stabilizer to tank floor.

Shaft assembly Following installation of the stabilizer (if needed), place the shaft in the tank and assemble as follows: Hoist the shaft vertically, and carefully lower into the tank while maintaining suitable support to permit assembly of impeller(s) and male coupling. While assemble shaft and impeller, rigid coupling should assembled with spring waster and flat washer, and then tighten, otherwise, it may cause runout of impeller shaft, and speed up the abrasion of gearbox and bearing.

Impeller assembly Install impeller with shaft, fixed with M14x140 bolt (2 bolts for each set of impeller) The impeller mounting location is kept by GN before delivery. For a canted single impeller or a dual impeller shaft, GN sets the distance of the lower impeller from the tank floor at 75 percent of the impeller diameter. Mount the optional second impeller at a distance above the tank floor that is equal to 2/3 of the tank’s maximum mud height. For example, if the tank mud depth is 10’, the second (upper) impeller key should be centered approximately 6.5’ above the bottom of the tank. For tank depths of 6’ or less, install a single straight impeller not more than 12” above the tank floor.

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www.gnsolidscontrol.com 1031

7 5 6

7 9

M

L M

3 2

= S

0 5

0 0 2

0 2 3

394 320

0 0 5 9 7 6

Fig.6: Motor and gearbox installation instruction

Motor and gearbox assembly and installation GN Solids control Co., Ltd. will install motor and gearbox before delivery. Clients can installation or disassembly as request. For details, please refer motor/gearbox user manual.

Gearbox and impeller coupling connection 1. Position and align shafts so that couplings are brought together, and fully mate couplings on shaft and gearbox 2. Check for a gap at any location around the coupling flanges. A gap indicates angular 16


misalignment. Difficulty in mating the shafts indicates parallel misalignment. Alignment should be checked with a dial indicator before bolting flanges together. 3. After aligning couplings, insert and tighten hex head screws (supplied with male coupling) to the recommended torque. Tighten in stages, using an alternating pattern until final torque is reached. Re-check torque after completing tightening sequence.

Fig. 7: Coupling assembly

Gearbox lubricant level Verify that lubricant level in the gearbox reaches the bottom of the oil level plug. Refer to Figure 8 for location of oil level plug.

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Vent plug

Drain plug

Level plug

Fig. 8: Gearbox Plug Locations

6. Electrical connections WARNING! TO AVOID SERIOUS PERSONAL INJURY BE SURE EQUIPMENT IS LOCKED OUT, TAGGED OUT, AND DE-ENERGIZED PRIOR TO PERFORMING MAINTENANCE AND/OR ADJUSTMENTS. WARNING! MOTOR MUST BE OPERATED AT THE DESIGNATED SUPPLY VOLTAGE. WARNING! HIGH VOLTAGE MAY BE PRESENT. BE SURE FUSED DISCONNECT SUPPLYING ELECTRICAL POWER TO THIS EQUIPMENT IS OPEN. LOCK-OUT AND TAG-OUT POWER SUPPLY TO PREVENT ACCIDENTAL APPLICATION OF POWER WHILE MAINTENANCE AND/OR ADJUSTMENTS ARE IN PROGRESS.

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WARNING! ELECTRICAL CONNECTIONS MUST BE MADE IN ACCORDANCE WITH THE NATIONAL ELECTRICAL CODE (NEC) AND ALL APPLICABLE LOCAL CODES. FAILURE TO COMPLY MAY RESULT IN AN UNSAFE CONDITION THAT COULD INJURE PERSONNEL OR DAMAGE EQUIPMENT. ENSURE THAT ALL ELECTRICAL AND CONDUIT CONNECTIONS ARE SECURE. Before making power connections, be sure that electrical source meets one of the following standards: 1. AC power at rated frequency is within ±10 percent of rated voltage, or 2. AC power at rated voltage is within ±5 percent of rated frequency, or 3. Combined variation in voltage and frequency is ±10 percent of rated values, provided the frequency variation does not exceed ±5 percent of rated frequency. Refer to drive manufacturer’s literature in Section 10 for additional assistance in making electrical connections.

7. Storage & handling If the machine will not be installed immediately, it should be covered with a tarpaulin (tarp). If unit is stored outdoors, use a UV- resistant tarp, or UV-resistant shrink-wrap. Install vents when using shrink-wrap. Seal operating and maintenance manual in plasti c, and attach to unit. GN mud agitators are shipped disassembled except for motor and gearbox, which are supplied as an assembly. All components including shaft are packa ged in a sea/air worthy wooden case. The delivered equipment should be transported on the ground using a forklift, lifting lugs as showed as fig.8.

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Fig. 9 Mud agitator lifting lugs

8. Machine start up & shutdown This section contains initial and normal startup and shutdown procedures for the mud agitator. These procedures are designed to ensure s afe operation and shutdown of the equipment.

Initial startup The Initial Startup procedure is to be used when the equipment is being started for the first time, or when equipment is returned to use after an extended period out of service. The initial startup is performed as follows: 1) Verify that all operators and maintenance personnel have read and understand all operating and safety information. 2) Verify that equipment has been assembled and instal led in accordance with part 2. 3) Check oil level in gearbox (see part 2). If low, fill to bottom of level plug. 4) Jog drive motor to check that impeller rotates in the correct direction. If rotation is incorrect, shut down and lock out and tag out electric power, and reverse any two leads to switch direction of motor rotation. 20


5) Start up mud agitator in accordance with the Normal Startup procedure.

Normal startup and operation After the initial startup, the mud agitator is started up and operated as follows: 1) Verify that all personnel, tools, documents, and other material are clear of equipment. 2) Turn on the mud agitator, and then open the associated mud feed and outlet systems. 3) Observe the operation of the impeller shaft assembly as the tank fills with mud and verify continuous rotation of impeller(s).

Normal shutdown procedure To shut down the mud agitator for any reason, first shut off the mud feed and then turn off electric power to the agitator motor.

Emergency shutdown To immediately stop the machine in case of emergency, open the fused disconnect supplying electric power to the machine.

9. Maintenance General Routine maintenance is critical to ensure maximum life and trouble-free operation of the mud agitator. While the recommended maintenance schedule in this section is flexible, modifications should be based on experience with operating the equipment at your facilities. A maintenance log should be kept to help establish a routine maintenance schedule, as well as to monitor and adjust the schedule as necessary throughout the equipment’s life. When determining a suitable maintenance schedule, consider duty cycle, ambient temperature, and operating environment.

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WARNING! TO AVOID SERIOUS PERSONAL INJURY, LOCK OUT, TAG OUT, AND DE-ENERGIZE MACHINE PRIOR TO PERFORMING MAINTENANCE.

Routine maintenance Routine maintenance consists of checking gearbox oil level and oil condition and greasing gearbox bearings at required intervals. Before operation, lubrate gearbox with L-CKE/P 220~320# worn gear oil (while ambient temperature around -30~40℃; or with L-CKE/P 320~460# worn gear oil (while ambient temperature around 25~65℃. Verify that lubricant level in the gearbox reaches the bottom of the oil level plug. Refer to the following tables for oil quantities and approved lubricants. Bearings should be cleaned and re-greased on the same schedule as oil changing. After cleaning, fill bearings to one-third of their free volume. After 100 hours of initial startup, clean gearbox inside, add new grease oil. Then lubricated at every 2500-hour interval.

Agitator model Motor power Impeller speed Brand & Ambient model

Worn gear grease oil

JBQ5.5

JBQ7.5

JBQ11

JBQ15

5.5kw

7.5kw

11kw

15kw

(7.5hp)

(10hp)

(15hp)

(20hp)

60/72RPM

60/72RPM

60/72RPM

60/72RPM

N460 worm gear oil

Accordance

temperature

Standard:

-30 ~ 40℃

SH0094-1991

Ambient

with

N220 worm gear oil

temperature 25 ~ 65℃ Gearbox oil Qty（L）

8.6

16.7

16.7

27.2

Lubricated with suitable grease oil as request. Refer following table with some interchangeable grease oil brand for users to choose at different ambient temperature.

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Ambient temperature

Gearbox lubricating oil manufacturer & model

℃

Sinopec L-CKE/P220 L-CKE/P320 L-CKE/P320 L-CKE/P460

30 ~ 40℃ 25 ~ 65℃

Shell Shell Tivela S320 Shell Tivela S320 Shell Tivela S320 Shell Tivela S460

Mobil Gear 630XP Gear 632XP Gear 632XP Gear 634XP

While gearbox or motor temperature over 90°C, or vibrate/sound abnormally, shut up equipment and check immediately. Fasten all linking bolts periodically.

10. Troubleshooting If mud disturbance in the tank becomes unsatisfactory, check the possibilities listed below and correct as described. PROBLEM Over-temperature

Too vibration noise

much and

Working current fluctuated greatly

POSSIBLE CAUSE Motor and gearbox suitably

REMEDY not installed Adjust to suitable position, enable motor and gearbox axes concentric Abnormal abrasion of oil seal Trickle lubricating oil at oil seal ledge Lubricating oil too much or less Adjust oil quantity baseds on oil level plug Lubricating oil not pure, or not Replacing with new oil workable well Motor and gear box not fixed well Check and find out the loosing point, fasten correctly worm gear supplementary tooth badly Replacing worm gear worn/ damaged supplementary tooth (connect GN) bearing badly worn or disabled Replacing bearing Linking bolts for coupling and agitator Fasten or replacing bolts output plate pull off, or foundation bolts pull off Impeller shaft bended or deformed Align the shaft Impeller local distortion or broken off Repair or replace impeller worm / gear in gearbox badly worn Inspection gearbox gradually, repair or replace relative parts Far-forth top circle of shaft rubbed with Align shaft or re-install stabilizer inner wall stabilizer

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Coupling damaged

Replace coupling completely, or replace elastic sleeve package Noise Bearing badly worn or with too bigger Replace bearing gap Worm gear supplementary tooth not Repair booth surface or joggled well replace worm gear supplementary tooth Lubricating oil insufficient Add oil accordance with oil gauge figure extraneous materials in gearbox Clean out lubricating oil to empty extraneous materials, and add new oil Oil leakage Oil sealing ledge badly worn Replace oil sealing Too much lubricating oil Adjust oil quantity accordance with oil gauge figure Oil level plug screw not tighten well Tighten or add more sealing adhesive tape Oil leveler damaged Replace oil a new leveler Worm gear Lubricating oil cannot meet standard Replace suitable lubricating supplementary oil tooth worn Lubricating oil insufficient Refill lubricating oil shortly accordance with oil leveler showed Lubricating oil is not changed timely, Replacing lubricating oil and become degraded timely as request over-temperature while operation Treated as over temperature or reduce ambient temperature

11. Recommended spare parts The following is a recommended spare parts list for 1 year operation: S/C

1

2

Series no.

Model

Qty

Worm wheel bearing

30210

2

Worm bearing

6213

2

Worm wheel oil seal

65x95x12

1

Worm oil seal

50x80x12/10

1

Worm wheel bearing

30211

2

Worm bearing

6214

2

Worm wheel oil seal

70x100x12

1

Remarks

GNJBQ5.5/7.5

GNJBQ11

24


3

Worm oil seal

55x80x12

1

Worm wheel bearing

30212

2

Worm bearing

6215

2

Worm wheel oil seal

75x105x14

1

Worm oil seal

60x90x12

1

GNJBQ15

12. Terms of warranty All GN equipment sold pursuant to this agreement, guarantee 14 Months after shipment or 12 months after commissioning, whichever comes first. During the guarantee period, GN will be responsible for problems caused by quality of production or raw material except the wearing spare parts of the equipment and problems caused by incorrect man-made operation, providing GN operating, maintenance and inspection recommendations are followed, and authorized oil filters and lubricants are utilized and replaced at the recommended intervals. In the event of improper installation, abuse, misuse, i mproper operation or improper or lack of maintenance of

GN equipment in accordance with GN recommendation and

accepted industry practice, this Warranty will become null and void with respect to such GN equipment. During the period of warranty and upon written notification to GN by the Purchaser, GN guarantees replacement of all pa rts manufactured by GN shown to be defective in material and manufacture. GN makes no further warranty, either expressed or implied, for any amount in excess of the cost of repair or replacement of any part shown to be defective. The foregoing warranty shall be null and void and of no further force or effect with respect to any GN equipment on which any repairs or maintenance, other than normal wear part replacements, are performed by any service provider other than GN or GN authorized providers. This Warranty does not cover and GN makes no warranty covering: a. Failures occurring after expiration of the warranty period. b. Failure caused by decomposition by chemical action or wear caused by abrasion. c. Equipment damaged in shipment or by accident. d. Defects in articles purchased by GN or its affiliates from non-affiliated parties and

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resold without alteration, which are covered by warrant y from the original manufacturer. e. Failures due to abuse, misuse, or lack of proper recommended maintenance. f. Failures of equipment, which has in any way been repaired or altered except as authorized by GN or equipment using components manufactured or repaired by any other party than GN unless expressly authorized by GN. The foregoing warranty shall be herein referred to as the “Agitator Warranty”. The Mud Agitator Warranty is for the exclusive benefit of Purchaser. THE

AGITATOR

WARRANTY

CONSTITUTES

GN’S

SOLE

AND

EXCLUSIVE WARRANTY WITH RESPECT TO ANY AGITATOR PURCHASED HEREUNDER, EXCEPT FOR THE AGITATOR WARRANTY, GN HEREBY DISCLAIMS ALL EXPRESS WARRANTIES (WHETHER ORAL, WRITTEN OR ARISING BY PROMISE, DESCRIPTION OR SAMPLE) AND ALL IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, WARRANTIES OF NON-INFRINGEMENT, ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR ANY PARTICULAR PURPOSE, AND ALL WARRANTIES ARISING BY CUSTOM OR TRADE USAGE.

Purchaser represents that it has evaluated the GN Agitators in light of the Agitator Warranty and has determined that the GN Agitator are fit and sufficient for Purchaser’s operations (including the Processing applications). Purchaser acknowledges that it is solely responsible for evaluating and choosing the sites where the GN Agitator will be installed and the manner in which GN Agitators will be used. GN does not warrant that the Environmental Protection Agency (“EPA”) or any other regulatory authority has approved or certified the GN Agitators for any purpose. Purchaser assumes any risk, burden and/or costs of EPA or their regulatory compliance with respect to any GN Agitator acquired pursuant to this Agreement. GN has made no inspection of the sites where Purchaser intends to install the Centrifuges and disclaims any warranties with respect to installation of the GN Agitators. Purchaser shall use its best efforts to ensure that all persons or entities renting or leasing GN Agitators are informed of the foregoing exclusive warranty and warran ty disclaimer.

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13. Installation and maintenance log Purpose This section should be used by operating and maintenance personnel to record historical information gathered during the installation and operation of GN equipment. If properly kept, the log will be useful for altering maintenance intervals and intercepting trends that may indicate the need for changing operating procedures. Each entry in the log should be dated for future reference and tracking. If required, additional pages may be added to the log by copying a blank page or simply inserting ruled paper at the rear of the section.

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Installation and Maintenance Notes:

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Agitator User Manual

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