MUDPUPPY 250 User manual
Mud Puppy 250 Installation, Operation & Maintenance Manual
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TABLE OF CONTENTS
FOREWORD 5
GENERAL INSTRUCTIONS 5
BEFORE SERVICING PUMPS 6
INSTALLATION 6
INTERCHANGEABILITY 6
PUMP ASSEMBLY AND MOUNTING 6
LOCATION 7
FOUNDATION 7
COUPLING ALIGNMENT 7
PIPING 9
PUMP SUCTION 9
PUMP DISCHARGE 10
PREPARATION FOR OPERATION 11
INITIAL LUBRICATION 11
MECHANICAL SEALS 11
PRIMING THE PUMP 12
PACKED PUMPS 13
MECHANICAL SEAL PUMPS 14
OPERATION 15
MAXIMUM OPERATING CONDITIONS 15
PUMP RECORDS 15
LUBRICATION of BEARINGS 15
LUBRICATION of INBOARD LIP SEALS 16
PACKING 16
PACKING APPEARANCE 17
CORRECT INSTALLATION OF PACKING 17
GREASE 18
WATER 18
Re-PACKING THE PUMP (Rope Packing Seal Option) 19
PUMP INSPECTION 21
IMPELLER 21
SHAFT 21
SHAFT SLEEVE 21
MECHANICAL SEAL 21
PACKING BOX 21
BEARINGS 21
SEALS 22
GENERAL 22
PUMP ASSEMBLY 22
SHAFT and BEARING SUBASSEMBLY 22
REPLACING THE MECHANICAL SEAL 22
EXCESSIVE PACKING LEAKAGE and RAPID PACKING WEAR 26
GENERAL 26
PACKING APPEARANCE 26
WATER FLUSH SYSTEM ACCEPTABLE BY OIL COMPANIES 26
GENERAL 26
CONTROLLING WATER PRESSURE TO THE PACKING 26
CONTROLLING WHEN TO USE WATER ON PACKING 26
BEARING FAILURES and HOW TO IMPROVE BEARING LIFE 27
GENERAL 27
MISALIGNMENT BETWEEN PUMP and DRIVER 27
DETECTION OF BEARING FAILURE WHEN PUMP IS RUNNNING 27
IDENTIFICATION OF BEARING FAILURE 28
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ABNORMALLY HIGH TEMPERATURES 28
GREASE APPEARANCE 28
NOISE 28
BEARING DISCOLORATION 28
RETAINER FAILURE 28
DIRTY LUBRICATION 29
TOO MUCH LUBRICANT 29
WRONG KIND OF LUBRICANT 29
MISCELLANEOUS INFORMATION 29
OPERATING LIMITS OF RIG CENTRIFUGAL PUMPS 29
SUCTION LINE VELOCITY 29
NET POSITIVE SUCTION HEAD (NPSH) 29
CAPACITY REQUIREMENTS OF EQUIPMENT IN RIG APPLICATIONS 30
LONG TERM PUMP and MOTOR STORAGE 30
INSTALLATION OF REPLACEMENT PARTS 31
INFORMATION REQUIRED to ORDERPARTS: 32
RECOMMENDED USAGE and REPAIR INFORMATION to COLLECT: 32
TROUBLESHOOTING 32
EXCESSIVE WATER LEAKING and RAPID PACKING FAILURE: 32
PACKING BURNED 33
LONG TERM PUMP AND MOTOR STORAGE 33
CUSTOMER SERVICE 33
Mud Puppy 250 Mud Pump and Wet End Kit Order Sheet 34
250 Pump Motor Mount Shaft Kit Long Body 35
250 PUMP MOTOR MOUNT SHAFT KIT SHORT BODY 36
250 PUMP WET END KIT 4X3X13 DUCTile IRON MECHANICAL SEAL 37
250 PUMP WET END KIT 4X3X13 DUCTILE IRON PACKED SEAL 38
250 PUMP WET END KIT 4X3X13 CHROME MECHANICAL SEAL 39
250 PUMP WET END KIT 4X3X13 CHROME PACKED SEAL 40
250 PUMP WET END KIT 6X5X11 DUCTILE IRON MECHANICAL SEAL 41
250 PUMP WET END KIT 6X5X14 DUCTILE IRON MECHANICAL SEAL 42
250 PUMP WET END KIT 6X5X11 DUCTILE IRON PACKED SEAL 43
250 PUMP WET END KIT 6X5X14 DUCTILE IRON PACKED SEAL 44
250 PUMP WET END KIT 6X5X11 CHROME MECHANICAL SEAL 45
250 PUMP WET END KIT 6X5X14 CHROME MECHANICAL SEAL 46
250 PUMP WET END KIT 6X5X11 CHROME PACKED SEAL 47
250 PUMP WET END KIT 6X5X14 CHROME PACKED SEAL 48
PIPING RECOMMENDATIONS 49
PIPING RECOMMENDATIONS (CONTINUED) 50
PIPING RECOMMENDATIONS (CONTINUED) 51
250 PUMP DIMENSIONS LONG BODy 52
250 PUMP DIMENSIONS SHORT BODY 53
250 PUMP Short Body Pump Assembly with Rope Packing –Base Selection 54
250 PUMP Short Body Pump Assembly with Mechanical Seal – Base Selection 55
250 PUMP Long Body Pump Assembly with Rope Packing –Base Selection 56
250 PUMP Long Body Pump Assembly with Mechanical Seal – Base Selection 57
250 PUMP HOUSING, IMPELLER, STUFFING BOX AND FLANGE GASKET
SELECTION 58
250 PUMP 3X2X13 PUMP CURVE 970 RPM 59
250 PUMP 3X2X13 PUMP CURVE 1150 RPM 60
250 PUMP 3X2X13 PUMP CURVE 1450 RPM 61
250 PUMP 3X2X13 PUMP CURVE 1750 RPM 62
250 PUMP 3X2X13 PUMP CURVE 2900 RPM 63
250 PUMP 3X2X13 PUMP CURVE 3500 RPM 64
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250 PUMP 3X2X13 PUMP CURVE 700-2500 RPM 65
250 PUMP 4X3X13 PUMPCURVE 970 RPM 66
250 PUMP 4X3X13 PUMP CURVE 1150 RPM 67
250 PUMP 4X3X13PUMP CURVE 1450 RPM 68
250 PUMP 4X3X13PUMP CURVE 1750 RPM 69
250 PUMP 4X3X13 PUMPCURVE 2900 RPM 70
250 PUMP 4X3X13 PUMPCURVE 3500 RPM 71
250 PUMP 4X3X13 PUMP CURVE 1000-2400 RPM 72
250 PUMP 6X5X11 PUMP CURVE 970 RPM 73
250 PUMP 6X5X11 PUMP CURVE 1450 RPM 74
250 PUMP 6X5X11 PUMP CURVE 1750 RPM 75
250 PUMP 6X5X11 PUMP CURVE 800-1800 RPM 76
250 PUMP 6X5X14 PUMP CURVE 970 RPM 77
250 PUMP 6X5X14 PUMP CURVE 1150 RPM 78
250 PUMP 6X5X14 PUMP CURVE 1450 RPM 79
250 PUMP 6X5X14 PUMP CURVE 1750 RPM 80
250 PUMP 6X5X14 PUMP CURVE 800-1800 RPM 81
Back Cover 82
Mud Puppy 250 Installation, Operation & Maintenance Manual
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FOREWORD
This manual contains instructions for the installation, operation, and
maintenance of the MUD PUPPY 250 pump. As pump service conditions and
specifications vary considerably in pump installation, this manual cannot
cover every situation. But, it is intended that the information included will
serve as a guide. Should questions arise, or start-up problems occur, it is
suggested that you contact the Mud Puppy Corp. distributor or Sales
Representative in your area.
The MUD PUPPY 250 pump generation is an improved version of older 2½
inch shaft pumps. The MUD PUPPY 250 pump is designed to give longer
service life through a wear pad replacement casing, superior bearings,
stainless shaft sleeve, labyrinth bearing cap seals, semi open impellers and
stainless casing nuts.
There are many principles of proper pump installation and applications as
well as special considerations for the MUD PUPPY 250 design that, if
followed, will further enhance its performance.
This document will deal with both general and specific recommendations for
improved Mud Puppy 250 performance in both oilfield and also industrial
applications.
GENERAL INSTRUCTIONS
1. Operate the pump only in the performance range for which it was
designed.
2. The pump driver must drive the pump CLOCKWISE when viewed
from the coupling end. Reversing the rotation will damage the pump.
3. Do not operate the pump with the suction or discharge valves
closed.
4. Adjust the packing so that a small amount of leakage remains for
lubrication and cooling (not applicable for pumps equipped with
mechanical seal).
5. When operating in drilling mud, prevent packing drip page from
clogging the drip area and hardening around the slinger and front
seal. See Section E for mechanical seal installation.
CAUTION!
EXERCISE SAFETY IN ALL PERFORMANCES: DO NOT IGNORE ANY
WARNINGS; USE ONLY APPROVED METHODS, MATERIALS AND TOOLS.
DO NOT PERMIT ANY FUNCTION OF QUESTIONABLE SAFETY; ACCIDENTS
ARE CAUSED BY UNSAFE ACTS AND UNSAFE CONDITIONS.
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BEFORE SERVICING PUMPS
1. SHUT DOWN OR DISENGAGE THE PUMP POWER SOURCE.
2. SHUT DOWN ALL PUMP ACCESSORY EQUIPMENT.
3. RELIEVE OR "BLEED OFF" ALL PRESSURE
FROM THE LINES PRIOR TO REMOVING
PIPING.
INSTALLATION
INTERCHANGEABILITY
The MUD PUPPY 250 horizontal centrifugal pumps outside envelope
dimensions are the same as older 2½ inch pumps of the same nominal size
so the models can be interchanged without changing existing piping,
couplings, or bases.
PUMP ASSEMBLY AND MOUNTING
To install the Mud Puppy 250 pump, place the pump on the machine lining
up the pump with the mounting holes. Mount using (4) 5/8” X 2 ¾” bolts, (8)
5/8” flat washers (4) 5/8” lock washers and (4) 5/8” nuts.
250 Pump Short Body Pedestal 250 Pump Long Body Pedestal
WARNING!
FAILURE TO OBSERVE THE WARNINGS AND NOTES OF CAUTION IN
THIS PUBLICATION CAN RESULT IN PROPERTY DAMAGE, SERIOUS
BODILY INJURY, OR DEATH.
ATTENTION!
THESE TERMS ARE USED TO DRAW ATTENTION TO ACTION THAT WILL
CAUSE DAMAGE TO THE PUMP, COMPONENTS OR ATTACHMENTS.
WARNING!
FAILURE TO SHUT DOWN POWER AND RELIEVE PRESSURE FROM THE
PUMP BEFORE SERVICING CAN RESULT IN SERIOUS PERSONAL
INJURY AND PROPERTY DAMAGE.
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LOCATION
The pump should be located near the liquid source so that the suction line
may be short and direct. The pump should be located below the level of the
liquid to eliminate the necessity of priming.
FOUNDATION
The foundation should be sufficiently rigid and substantial to absorb any
vibration and support the base plate at all points. A concrete foundation,
poured on a solid footing of adequate thickness to support the pumping
unit, provides the most satisfactory foundation. The base plate should be
installed in a level position.
COUPLING ALIGNMENT
Good service life of the pump and driver depends upon good alignment
through the flexible coupling. If the electric motor was mounted at the factory,
the pump and motor were in alignment when shipped. The alignment
between the pump and driver should be inspected after installation to ensure
that transportation or other handling has not caused misalignment of the unit.
To check the alignment using a straight edge, lay the straight edge in line
with the shaft on the OD’s of the coupling halves. There should be no gaps
under the straight edge. Check two locations, 90 degrees apart. Angular
misalignment can be checked by measuring the gap between coupling half
faces. There should be no more than a 1/64th of an inch in the gap between
coupling halves.
NOTE:
A DETAILED DESCRIPTION OF PROPER PROCEDURES FOR GROUTING
BASE PLATES MAY BE FOUND IN THE HYDRAULIC INSTITUTE
STANDARDS, 13TH EDITION, PAGES 116 AND 117.
CAUTION!
MISALIGNMENT BETWEEN THE MOTOR AND 250 PUMP COULD CAUSE
FAILURE OF THE COUPLING, PUMP, MOTOR, BEARING OR EITHER
SHAFT. ALIGNMENT MUST NOT BE ATTEMPTED UNTIL THE BASE IS IN
POSITION AND THE MOUNTING AND FLANGE BOLTS HAVE BEEN
TIGHTENED.
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The recommended procedure for coupling alignment is with the use of a dial
indicator, as illustrated in Figures 1 and 2. The dial indicator is attached to
one coupling half with the indicator button resting on the 0.0. of the other
coupling half to measure offset misalignment. To measure angular
misalignment, the indicator is positioned so that the buttons rest on the face,
near the 0.0., of the other coupling half. Rotate the shaft and dial indicator
one revolution while the other shaft remains stationary and note the T.I.R.
unless otherwise specified by the coupling manufacturer, offset misalignment
should be limited to 0.005 inches T.I.R. Adjust the alignment by loosening the
pump or driver mounting bolts and retighten or shim as required.
Figure 1 Figure 2
Measuring Offset Misalignment Measuring Angular Misalignment
Using A Dial Gauge Using A Dial Gauge
In areas where a dial indicator arrangement is not available, an adequate
job of alignment can be done with a straightedge. This method is especially
useful if the coupling used contains a rubber drive element.
Figure 1A Figure 2A
Measuring Offset Misalignment Measuring Angular Misalignment
Using a Straightedge Using a Straightedge
To check offset misalignment, lay the straightedge in line with the shafts on
the O.O.'s of the coupling halves. There should be no gaps under the
straightedge. Check two locations 90 degrees apart. Angular misalignment
can be checked by measuring the gap between coupling half faces. There
should be no more than a 1/64 inch gap under the straightedge or a 1/64 inch
variation in the gap between the coupling halves. See Figures 1A and 2A.
Mud Puppy 250 Installation, Operation & Maintenance Manual
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PIPING
Piping must not be connected to the pump until the grout has hardened and
the foundation and pump hold down bolts have been tightened.
Connect the inlet hose from the tank to the front of the 250 pump. Connect
the hose going to the Desander Manifold from the top of the 250 pump. There
will also be a hose running from the Mix Hopper.
OUTLET FROM DESANDER MANIFOLD
Inlet from Mud Tank
Piping should be anchored independently of the pump and as near to it as
possible. Pipe companion flanges should line up naturally with pump flanges.
PUMP SUCTION
Properly selected and installed suction piping is extremely important to
eliminate vibration and cavitation in the pump. Vibration can cause packing
problems, mechanical seal damage, or undue bearing loads.
The suction line should be equal to or larger than the pump suction.
NOTE:
FURTHER REFERENCE ON COUPLING ALIGNMENT CAN BE FOUND IN
HYDRAULIC INSTITUTE STANDARDS, 13TH EDITION, PAGES 177 & 120.
CAUTION!
DO NOT DRAW THE PIPE TO THE PUMP WITH FLANGE BOLTS.
Mud Puppy 250 Installation, Operation & Maintenance Manual
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A positive shut-off valve of a type to cause minimal turbulence should be
installed in the suction line to permit the closing of the line for removal of the
pump for inspection and maintenance.
The suction line should be designed to eliminate any air pockets. The piping
should gradually slope downwards to the supply source to eliminate air
pockets.
The suction line should have a straight section into the pump of a length
equivalent to at least two times its diameter; i.e. a 4-inch suction line should
have a minimum 8-inch straight run.
For temporary hook-up when flexible hose is used, a non-collapsing hose is
essential since the suction line pressure is often below atmospheric pressure.
A collapsed suction line will result in below average or complete loss of flow.
PUMP DISCHARGE
A positive shut-off valve should be located in the discharge piping to permit
the closing of the line for removal of the pump for inspection and
maintenance. All piping should be independently supported and accurately
aligned.
CAUTION!
THE CAPACITY OF A CENTRIFUGAL PUMP SHOULD NEVER BE
ADJUSTED BY THROTTLING THE SUCTION LINE.
PUMP DISCHARGE
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If operating conditions are not known with sufficient accuracy, it will be
necessary to provide a throttle valve in the discharge line to ensure that the
pump operates at the design point.
If the pump is connected to a pressurized system, it is important to install a
check valve between the pump discharge and the throttling valve. The check
valve will prevent back flow through the pump. Back flow may cause the
impeller to become loose on the shaft.
PREPARATION FOR OPERATION
INITIAL LUBRICATION
Standard pumps are shipped Grease Lubricated with Chevron Duralith EP#2
Grease.
The air vent should be kept clean to prevent pressure build-up due to heating
that occurs in normal operation. Oil lubrication is available upon request.
There is a dipstick available that indicates the correct oil level.
MECHANICAL SEALS
When mechanical seals are furnished they are installed and adjusted at the
factory. The H22451-1 tungsten carbide mechanical seal normally used in
drilling mud environments do not require external flush.
To properly prepare special or industrial mechanical seals for operation,
various cooling and flushing flows may have to be connected. Liquid from an
outside source may be required. If outside flushing is required, connect the
necessary cooling or flushing lines to the seal and be sure they are operating
before starting the pump. See seal drawings and instructions if special seals
are used.
CAUTION!
THE PUMP MUST NOT SUPPORT THE WEIGHT OF THE PIPE OR
COMPENSATE FOR MISALIGNMENT.
CAUTION!
A LOOSE IMPELLER WILL LIKELY RESULT IN MECHANICAL DAMAGE
AND FLUID LEAKAGE BENEATH THE SHAFT SLEEVE.
Mud Puppy 250 Installation, Operation & Maintenance Manual
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PUMP ROTATION
Most pumps manufactured have clockwise rotation when viewed from the
coupling end. The correct rotation can be found by an arrow on the casing.
It is very important that the pump rotation is determined before starting the
pump. If The Mud Puppy 250 is turned backwards the impeller may unscrew
causing severe damage to the pump.
The best way to check rotation is to disconnect the coupling, but it can be
checked without disconnecting the coupling. One person should be at the
pump watching the shaft while a second person starts and then immediately
stops the pump so the shaft barely turns over.
Once the pump is completely installed check for any water leaks, check the
hydraulic fluid pressure at the desander pump; ensure you have at least 30 lbs of
pressure. When performing this pressure test ensure pick up pump control valve
is adjusted all the way in. Ensure the rotary valve for the pickup pump is in the off
position.
PRIMING THE PUMP
Be sure the pump has fluid in the casing before running. If the pump is
operated without fluid, the mechanical seal or packing can be destroyed. Vent
air from the suction line and fill it with liquid. Start the pump with the discharge
valve cracked open. After discharge pressure stabilizes, gradually open the
discharge valve to the required position. If flow is lost, close the discharge
valve and wait a few seconds for the discharge pressure to build. Continued
flow difficulty indicates improper pump selection or installation.
WARNING!
NEVER OPERATE A PUMP "DRY" WITH MECHANICAL SEALS.
MECHANICAL SEAL FAILURE WILL OCCUR!
CAUTION!
CHECK PUMP ROTATION BEFORE RUNNING.
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PACKED PUMPS
Loosen the packing on startup. The gland bolt nut should be only finger tight.
New packing will expand faster with heat than older packing. Therefore, new
packing must be adjusted more slowly than old packing. Too tight and it will
not leak. With no cooling, it will burn, and be no good for sealing. MUD
PUPPY 250 pumps with mechanical seals have backup packing. This
packing should be very loose and not tightened until seal failure occurs.
WARNING!
RUNNING THE PUMP WITH IMPROPER PRIMING MAY DESTROY THE
SEALING FACES OF THE MECHANICAL SEAL DUE TO OVERHEATING OR
MECHANICAL DAMAGE FROM PULSATION BETWEEN STATIONARY AND
ROTATING COMPONENTS. DO NOT RUN THE PUMP WITH THE SUCTION
VALVE CLOSED AT ANY TIME! THERMAL SHOCK CAN CRACK THE
STATIONARY SEAT IF THE TEMPERATURE IS RAISED FROM ROOM
TEMPERATURE TO 250°F IN LESS THAN 30 SECONDS. RUN THE PUMP
WITH THE DISCHARGE VALVES CLOSED ONLY FOR SHORT PERIODS
OF TIME. THE ENERGY GOING INTO THE PUMP HEATS THE FLUID IN
THE CASING. IF THE PUMP NEEDS TO OPERATE SHUT IN SOME OF THE
TIME, BE SURE TO INSTALL A SMALL LINE (1/4 OR 1/2 INCH) BACK TO
THE SUCTION TANK BETWEEN THE DISCHARGE VALVE AND THE PUMP
FOR COOLING!
NOTE:
PACKING MUST HAVE COOLING; THEREFORE, IT MUST LEAK.
PACKING
GLAND NUTS
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When adjusting the packing always adjust only ¼ turn on each nut at a time;
waiting for the packing to heat before adjusting tighter.
MECHANICAL SEAL PUMPS
Be sure the pump is never started dry. Seal faces will gall in less than a
minute if run dry. The backup packing should not be tightened until seal
failure occurs. The packing can then be installed and the pump run normally
until the mechanical seal is repaired.
Check the following items before starting the pump:
1. Pump rotates freely by hand.
2. Pump rotates in proper direction.
3. Coupling aligned.
4. Oiler full and oil level correct (oil lube pumps).
5. Suction valve fully open.
6. Pump and suction line full of fluid.
7. Discharge valve is slightly open, not fully open. Fully open the
discharge valve after the pump is running.
CAUTION!
THE PACKING MUST LEAK 10-12 DROPS PER MINUTE TO REMAIN COOL.
WARNING!
IT IS ABSOLUTELY ESSENTIAL THAT THE ROTATION OF THE MOTOR BE
CHECKED BEFORE CONNECTING THE SHAFT COUPLING. INCORRECT
ROTATION OF THE PUMP FOR EVEN A SHORT TIME WILL DISLODGE THE
IMPELLER AND DAMAGE THE IMPELLER, SHAFT OR BEARING HOUSING.
THE PUMP SHAFT MUST TURN CLOCKWISE WHEN VIEWED FROM THE
MOTOR END.
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OPERATION
MAXIMUM OPERATING CONDITIONS
PUMP RECORDS
Information to be included in these records should be:
1. Pump size and serial number.
2. Pump model number, impeller diameter, material of construction.
3. Mechanical seal manufacturer, type, code and drawing number.
4. Motor horsepower and speed of operation.
5. Service conditions.
6. Frequency of operation.
7. Record of maintenance, including parts usage and general pump
conditions.
8. Nomenclature and part number of replacement items.
LUBRICATION OF BEARINGS
The pump is shipped with sufficient lubrication packing in the bearing to
assure trouble-free operation for normal service life. Under normal operating
conditions, no lubricant needs to be added to the bearings. If the pump is
disassembled, it is advisable to pack the bearings with grease properly before
re-assembly. Pack the bearing through approximately one-half of its
circumference. It is not necessary to put grease in the bearing cap or
pedestal.
The bearings normally may run at temperatures up to 180ºF, without injury. A
temperature of 180ºF is hotter than the hand can stand to touch for one second
or two. But will not burn off the paint. The temperature may be determined
by sticking a thermometer to the bearing cap with heavy grease and leaving it
for (20) minutes.
If the bearing run hot, immediate service is necessary. This abnormal
condition indicates that:
NOTE:
MAINTAIN DATA CARDS OR PUMP RECORDS WHENEVER POSSIBLE. THIS
WILL PROVIDE READY ACCESS TO INFORMATION FOR ORDERING SPARE
PARTS AND FOR EVALUATING PUMP AND MECHANICAL SEAL
PERFORMANCE
Mud Puppy 250 Installation, Operation & Maintenance Manual
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1. The bearings may not be properly installed.
2. Pump and motor are out of alignment.
3. Excessive grease has been forced into the bearing housing.
4. Insufficient grease is present in the housing.
5. Improper grade or contaminated lubricant is present in the bearing
housing.
To correct this condition, perform the following in the order listed:
1. Check the motor and pump for misalignment.
2. Check for proper amount of grease.
3. Return the pump to service.
4. In addition, a competent lubrication engineer should be consulted to
recommend the proper lubricant for the particular operating
condition.
Pumps are supplied from the factory grease lubricated unless oil lubrication
is requested. Oil lubrication should be used whenever the pump speed
exceeds 2400 RPM. The bearing caps have been drilled and tapped for
grease fittings. Mud Puppy Corp. recommended bearing grease is Chevron
Duralith EP#2 or compatible grease. Greases available in tubes are the
best. Five shots with a standard hand operated grease gun of the above
grease or equivalents in each bearing monthly is sufficient for twenty-four
hour per day operation.
LUBRICATION OF INBOARD LIP SEALS
The standard Mud Puppy 250 Pump is equipped with labyrinth seals that do
not require lubrication.
PACKING
Space is provided for two rings of graphite packing at the impeller side of the
Lantern Ring. Packing should be of a grade suited to the operating conditions
of the pump; square braded packing is regularly furnished. Excessive
tightening of packing gland nuts causes shaft wear. It is unnecessary and
WARNING!
FAILURE TO REMOVE THE GREASE RELIEF PORT PRIOR TO ADDING
GREASE CAN FORCE OLD GREASE PAST THE LIP SEALS AND INTO
THE BEARINGS, GREATLY SHORTENING THEIR LIFE. BEARING
FAILURES IS MORE OFTEN CAUSED BY LACK OF LUBRICATION MORE
OFTEN THAN NORMAL BEARING WEAR.
Mud Puppy 250 Installation, Operation & Maintenance Manual
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should be avoided. Slight leakage approximately 10-12 drops per minute is
desirable to act as a packing lubricant. A grease fitting has been installed in
the ¼” tapped Lantern Ring connection.
PACKING APPEARANCE
If the packing being removed is hard and brittle, it has been run dry at some
during its life. This is often done in the first hour of service. The packing has
more ability to grow with heat during its early life. Even if the packing is
adjusted just right before starting the pump, in the first few minutes the pacing
will grow with the heat and become over-tight, it then will run hot and burn
the packing.
CORRECT INSTALLATION OF PACKING
Make sure the box is clean of old packing and the
plastic lantern ring. Bend a wire and pull it down the
shaft to be sure it is smooth for good packing life.
The order to install is as listed. (See picture):
1. Graphite Rope Packing (against wear plate)
2. Graphite Rope Packing
3. Graphite Rope Packing
4. Grease Ring (with the groove in it)
5. Graphite Rope Packing
6. Graphite Rope Packing (until the packing is
complete)
CAUTION!
MOST EARLY PACKING FAILURES ARE CAUSED BY OVER TIGHTENING
OR POOR INSTALLATION.
CAUTION!
ONCE PACKING IS BURNED, IT WILL NEVER SEAL PROPERLY AGAIN.
NOTE:
EACH PIECE HAS A SPLIT IN IT. SEPARATE THE SPLIT IN THE GRAPHITE
ROPE PACKING BY TWISTING. FLATTEN THE GRAPHITE ROPE PACKING
WITH A HAMMER FOR EASIER INSTALLATION OF ROPE.
Mud Puppy 250 Installation, Operation & Maintenance Manual
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a. Wrap one piece around the shaft and push it into the stuffing
box.
b. Use the packing gland to push the piece as far in as possible,
(Rotate the split 90 degrees from the last, each time a piece is
installed)
c. Continue with the other pieces in the order listed until the
packing is complete, (repeating steps A and B above as
needed)
d. When the packing is completely installed, it should be flush (or
inside the face of the stuffing box) and not sticking out.
GREASE
The stuffing box may be relubricated with grease as often as necessary to
prevent the packing from overheating. It should be lubricated at least once a
day. It is best to install a spring-loaded grease cup to automatically lubricate
the packing. As you fill the grease cup a spring is compressed, and a stem
rises. As the grease is used the spring forces new grease to the packing and
the stem lowers. When the stem is low the cup needs refilling. Grease should
be pumped into the box while turning the shaft until it comes out around the
packing gland (approximately 20 shots).
If the packing leakage is excessive, thick water pump grease should be used
rather than the general purpose grease. In most cases general purpose
grease is acceptable.
WATER
It is best to inject water into the lantern ring from an external source when
pumping drilling mud. This will keep most of the solids out of the packing.
Needs to be inside the
face of the stuffing box.
Mud Puppy 250 Installation, Operation & Maintenance Manual
19
PACKING AND SHAFT LIFE WILL BE INCREASED UP TO 500%. Also,
water leakage from the packing will not be as objectionable as mud.
If water cannot be used, the next best addition to the packing would be
grease from an automatic spring-loaded grease cup. There is a visual
inspection when the cup no longer has grease. The stored grease normally
last a week or more if the packing is adjusted correctly.
RE-PACKING THE PUMP (ROPE PACKING SEAL OPTION)
1. Make sure the box is cleaned of all old packing and the plastic grease
ring. Bend a wire and pull it down the shaft to ensure it is smooth for
good packing life. Feel for grooves in the shaft. Replace the shaft if there
are excessive grooves.
2. Grease all five shaft packing rings (5). Insert three packing rings
alternating the splits in the rings from top to bottom starting with the split
on the first ring on the bottom.
Mud Puppy 250 Installation, Operation & Maintenance Manual
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3. Install the Grease Ring so that the two halves encompass the pump
shaft. Slide the Grease Ring halves into the pump pedestal packing box
until they meet the third Rope Packing Ring.
4. Insert the final two Rope Packing Rings. The objective is to have the
last split down so that the leakage will drip down.
5. With the packing gland in position, swing the gland bolts into place.
Initially tighten the gland hard to compress the packing. Then back off
the gland bolts and retighten only finger tight.
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