Tuthill AC Guía rápida

V1.4 1 of 22 04/01/2009

Tuthill Pump Group

12500 South Pulaski Road

Alsip, IL 60803

USA

o708.389.2500

f708.388.0869

Service Instruction No. 22

Rev. 3 04/08

INSTALLATION AND SERVICE

INSTRUCTIONS

C SERIES PUMPS

V1.0 2 of 22 04/01/2009

General Description

Model AC

Model AC pumps are available in six sizes, ranging in capacity from 2 to 84 gpm with

differential pressures to 100 psi. The maximum discharge pressure capability is 125 psi.

They have an integrally cast mounting foot and are supplied in four different mounting

styles. This pump is suitable for driving at direct motor speeds and will pump equally well

in either direction of rotation (unless supplied with an internal relief valve). It is equipped

with a sleeve bushing, aluminum packing and an adjustable packing gland.

Model C1G

Model C1G is similar to model AC except that it is equipped with spring loaded V type

leather packing. Model C1G pumps have the packing chamber vented to the suction side

of the pumping zone. Therefore, the pump must operate in the direction for which it is

assembled. Model C1G is available in six sizes, ranging in capacity from 2 to 84 gpm with

differential pressures to 100 psi. The maximum discharge pressure capability is 125 psi.

Like the model AC, these pumps are available in four different mounting styles.

Models C1E, C1EN, CIF and C1FA

Model C1E and C1F pumps are sleeve bushing lip seal units designed for direct drive

service. Model C1E has an integral foot mount. Model C1F is a flange mount pump. Model

C1FA pumps are similar to model C1F but are supplied without a seal. Model C1EN

pumps are sleeve and ball bearing units with a lip seal and integral mounting foot

designed for indirect (belt, chain, gear) drive.

The seal chamber on these pumps is vented to the suction side of the pumping zone.

Therefore, the pump must operate in the direction for which it is assembled.

All models are available in five sizes, ranging in capacity from 6 to 84 gpm with differential

pressures to 100 psi. The maximum discharge pressure capability is 100 psi.

Model C1B

Model C1B is a flange mount pump with two sleeve type bushings and a mechanical seal.

It is bi-rotational, unless equipped with an internal relief valve. This pump is available in

five sizes, with capacities from 6 to 84 gpm and differential pressures to 150 psi. The

maximum discharge pressure capability is 300 psi. A mounting foot is optional.

Model CKIB

Model CK1B pumps are equipped with a mechanical seal and incorporate heavy-duty

features, including special double bearing construction with an inboard double ball bearing

and an outboard roller bearing. This pump is available in five sizes, with capacities from 6

to 84 gpm and differential pressures to 250 psi. The maximum discharge pressure

capability is 300 psi. A mounting foot is optional.

The seal chamber is vented to the suction side. Therefore, the pump must operate in the

direction for which it is assembled.

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Model CC

Model CC pumps are designed to mount directly to NEMA 56 143 TC or 145 TC C Face

motors, with modifications available for mounting to metric C motors. They are equipped

with a mechanical seal and will pump equally well in either direction of rotation (unless

equipped with an internal relief valve).

These pumps are available in four sizes, with capacities from 6 to 30 gpm and can handle

inlet pressures to 25 psi and differential pressures to 100 psi.

The Pumping Principle

Tuthill C Series cast iron pumps employ the internal

gear pumping principle. There are only two moving

parts. Pumping action is based on a rotor, idler gear

and crescent-shaped partition cast integral with the

cover.

Power applied to the rotor is transmitted to the idler

gear with which it meshes. The space between the

outside diameter of the idler and the inside diameter

of the rotor is sealed by the crescent.

As the pump starts, the teeth come out of mesh,

increasing the volume. This creates a partial

vacuum, drawing the liquid into the pump through

the suction port.

The liquid fills the spaces between the teeth of the

idler and the rotor and is carried past the crescent

partition through the pressure side of the pump.

When the teeth mesh on the pressure side, the

liquid is forced from the spaces and out through the

discharge port.

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WARNING!

Failure to follow these instructions could result in serious bodily injury or death.

These pumps should not be used for handling plain water, corrosive or abrasive

liquids or liquids not possessing adequate lubricity.

Do not attempt to work on any Tuthill pump installation before completing the

steps below. Disconnect the drive so that it cannot be started while work is

being performed.

Review the Material Safety Data Sheet (MSDS) applicable to the liquid being

pumped to determine its characteristics and the precautions necessary to ensure

safe handling.

Vent all pressure within the pump through the suction or discharge lines.

All Tuthill pumps contain residual 200 SSU lube oil from the factory production test.

Determine if this is compatible with the fluid you are pumping. If the fluid is

incompatible, consult the factory.

Most Tuthill C Series pumps are required to develop 25" mercury vacuum at 0 psi on

factory test. While these pumps will develop as high as 27" of vacuum, it is a sound

engineering practice to avoid extreme vacuum whenever possible. Select a pipe size to

reduce line friction loss to a minimum.

The pump should be located as close to the source of supply as conditions permit and if

possible, below the level of the liquid in the reservoir. When necessary to locate the

pump in a pit, provisions should be made to safeguard against flooding. Care must be

taken to properly support the suction and discharge piping so that no strain is put on the

pump due to either weight or expansion. Piping strain can result in misalignment, hot

bearings, worn couplings, and vibration. It is important that the piping used be clean and

free of chips and scales.

Proper Installation

Unsatisfactory pump installations are usually characterized by poor suction conditions for

the specific liquid being handled. Suction conditions should be minimized to prevent

vaporization of the liquid. If vacuum conditions force the liquid to vaporize, cavitation will

occur, resulting in loss of capacity, premature wear and noisy operation.

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When handling high viscosity liquids, the speed of the pump must be reduced and the

size of the lines increased to prevent cavitation.

Note: Pipeline friction increases at a rapid rate with an increase in viscosity. For a given

pump and motor, larger pipelines are necessary to maintain the same pump pressure

when changing from a thin fluid to a thick one.

Most Tuthill C Series pumps are supplied with both ports on the same plane. Pumps with

this type of porting arrangement should always be installed with the ports facing upward

to insure proper priming. If it is necessary to install the pump with the ports pointing to

either side, it is recommended that the top port be the suction port. This will prevent

gravity-induced drainage of fluid through the suction port. When pipes are installed, an

inverted "U" bend should be incorporated into the suction line close to the pump for

priming purposes.

Viewing the pump from the shaft end, the inlet port is on the right for clockwise rotation

and on the left for counter-clockwise rotation. On pumps with built in relief valves, the

adjusting screw of the valve must always be located on the suction side of the pump.

Pumps should be filled with oil at installation and should never be allowed to run dry.

Every pump installation should have a good foundation. Its structure should be

sufficiently strong to hold the pump rigid and to absorb any strain or shock that may be

encountered. The installation should be leveled, checked for proper piping alignment,

and then fastened securely.

Method of Drive

Direct drive through a traditional flexible coupling is recommended. (CC pumps are direct

driven by the motor shaft as an integral part of the pump.) However, do not expect the

flexible coupling to compensate for misalignment. Contact the coupling manufacturer to

determine the maximum amount of misalignment to which the coupling can be subjected.

Model AC, C1B and CC pumps can be driven in either direction of rotation, unless

outfitted with an internal relief valve. All other C Series pumps are directional. Rotation

must be specified at the time of order. The seal chamber communicates with the neutral

zone and therefore the seal/packing is subjected to approximately one half of the

discharge pressure.

All pump and motor units must be properly aligned during assembly and periodically

checked since misalignment may occur later due to abuse or other conditions. Pipe

strain can force the pump and motor shafts out of alignment. Therefore, all piping to the

pump must be properly supported. Do not allow the pump to act as a pipe support.

Provide for proper expansion of pipes when handling hot liquids. Allow pump to reach

operating temperature slowly. Rapid temperature change can result in damage to the

cast iron components.

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Never align a pump and motor supplied with a pin type coupling without first removing

the pins. Never depend upon sight or feel. Use proper gauges when aligning the pump.

Never operate the pump without all guards in place.

Relief Valve Protection

All C Series models are positive displacement pumps. As the pump rotates, liquid is

positively delivered to the discharge side of the pump. If the discharge line is closed off,

pressure will increase until the drive stalls and/or fails, the pump breaks or ruptures, or

the piping bursts. To prevent this from happening, the use of a pressure relief valve is

required. A relief valve that directs the flow back to the supply tank is recommended.

The internal relief valve available on C Series pumps is designed for overpressure

protection only. It is not intended as a flow control device or for any similar use.

Continuous operation of the relief valve will result in excessive heat buildup within the

pump cavity that could cause serious internal damage. Make certain the adjusting screw

of the relief valve is located on the suction side of the pump.

Unless otherwise specified at the time of order, all C Series pumps with an internal relief

valve (except CC models) are supplied with the standard spring, with a range of 30-225

psi (10 - 200 psi in size 2 pumps), set to provide full bypass relief at 90 psi. The standard

spring in CC model pumps has a range of 0 -110 psi, set to provide full bypass relief at

100 psi.

To adjust the relief setting within the range of a given spring's capability:

•Remove the cap nut (model CC pumps only).

•With a small wrench, hold the adjusting screw steady.

•With a second wrench, loosen the locking nut by rotating counterclockwise.

•Throttle the outlet line until the differential pressure at the pump port reaches the

desired level.

•If the pressure fails to reach this level with the throttling valve closed, turn the

adjusting screw inward (clockwise) until the desired pressure is reached.

(Adjusting clockwise raises the pressure setting.)

•If the pressure reaches the desired level before the throttling valve is completely

closed, turn the adjusting screw outward (counterclockwise) until the desired

pressure is reached. (Adjusting counterclockwise lowers the pressure setting.)

•Retighten the nut to lock the setting in place.

•Replace the cap nut (model CC pumps only).

•Recheck the pressure gauge reading.

If an internal relief valve has not been supplied with the pump some other means of

protection must be utilized. These include in-line safety relief valves, pressure shutdown

switches or other similar devices.

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Strainer Protection

Strainers are used to remove contaminated particles from the fluid system and extend

pump life. Every pump should be protected from these particles by a strainer in the

suction line.

Strainer size and mesh of screen are determined by the rate of flow and viscosity of the

fluid. Consult the strainer manufacturer for recommendations.

Never use a strainer with a built-in automatic by-pass on the suction line set to open

under 30" Hg. vacuum.

Install the strainer according to the designated direction of flow, locating it so that it is

accessible for servicing. Use a duplex type strainer when shutdown during service is not

possible.

Provide a vacuum gauge in the suction line for determining when the strainer requires

cleaning. Make certain strainer baskets are properly reinforced so as not to collapse

under 30" Hg. vacuum.

WARNING!

All Tuthill pumps contain residual 200 SSU lube oil from the factory test. Determine if this is

compatible with the fluid you are pumping. If the fluid is incompatible, consult the factory.

If the pump is to operate at elevated temperatures, it should be brought up to operating

temperature gradually. Rapid or sudden introduction of liquid at an elevated temperature

into the cold liquid chamber of the pump could cause damage to the seal or other internal

parts.

Do not run the pump dry. This could cause severe damage to the seal, bushings and/or

metal parts.

Startup

Prior to starting the pump double check the following:

•Pressure and vacuum gauges should be installed as close as possible to the

pump.

•Rotate pump shaft to ensure it turns freely without binding.

•Recheck alignment and ensure all guards are in place.

•Make sure piping is independently supported and no strain is being transmitted to

the pump.

•Make sure the safety relief valve is installed correctly.

•Check pump rotation.

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•Open suction and discharge gate valves.

•Check for any leaks once gate valves are open. After completing these checks

the pump can be started.

CAUTION!

The pump should not be run dry. If after approximately 60 seconds there is no discharge of

liquid, stop the pump and investigate the possible cause.

Failure to comply with this could cause severe damage to internal seals, bushings and/or

metal parts.

Pump Performance Data

Size Capacity (gpm)

CC009 9

CC015 15

CC020 20

CC030 30

Based on pumping a fluid of 200

SSU viscosity at 50 psi and 1750

rpm.

Based on pumping a fluid of 100

SSU viscosity at 50 psi and 1750

rpm.

Size

Capacity (gpm)

V1.4 9 of 22 04/01/2009

WARNING!

Failure to follow these instructions could result in serious bodily injury or death.

Do not attempt to work on any Tuthill pump installation before completing the steps below.

Disconnect the drive so that it cannot be started while work is being performed.

Review the Material Safety Data Sheet (MSDS) applicable to the liquid being pumped to

determine its characteristics and the precautions necessary to ensure safe handling.

Vent all pressure within the pump through the suction or discharge lines.

All Tuthill pumps contain residual 200 SSU lube oil from the factory production test. Determine

if this is compatible with the fluid you are pumping. If the fluid is incompatible, consult the

factory.

Service - Specific Models

Model AC

Lubrication

Model AC pumps are provided with a grease cup or grease gun fitting at the outer

bearing which also lubricates the packing. A good grade of medium cup grease, such as

Fiske Bros. Lubriplate #930 AAA, should be used. Apply until visible at the outer end of

the packing gland. If the pump is overheating, it may be due to lack of lubricant. Add

lubricant as needed or at least every 60 days or 500 hours of operation.

Repacking

•Grip the pump firmly across the ports and opposite side of the housing in a vise

with the shaft end up.

•Remove the lock wire and packing gland screws.

•Inspect the shaft at the flat and keyway area. Any burrs will interfere with

removal of the packing gland. Use a small, fine file if necessary.

•Slide the packing gland off the shaft.

•Remove the old packing from the bracket.

•Inspect the shaft. If the shaft is too badly worn or scored at the packing area,

the rotor must be replaced.

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•Position the new packing over the shaft and slide into the bracket.

•Install the packing gland and the screws. Take care when tightening up the

packing gland screws so as not to cause undue pressure in the stuffing box.

Pull up firmly on the packing gland screws, back off to finger tight and lock the

screws in place with the lock wire.

Aluminum packing is the standard in models 1AC through 6AC.Following is a table of packing

sizes:

Size ID OD Length

1 1/2" 55/64" 5/8"

2 5/8" 59/64" 3/4"

3 & 4 3/4" 1 1/8" 3/4"

5 & 6 1" 1 1/2" 1 1/2"

Changing Rotation

Model AC pumps in sizes 1 through 6 are bi-directional and will work equally well in

either direction of rotation with no modification.

If outfitted with an internal relief valve (model ACV), these pumps become rotational.

Rotation cannot be changed in the field unless the cover/valve assembly is replaced.

To change the location of the suction port on pumps supplied with Tuthill's unique

automatic reversing feature (model RAC):

• Remove the cover screws.

• Rotate the cover 180° so that the boss on the cover points to the new suction (inlet)

port.

• Align the mounting holes and reinstall the cover screws.

Model C1G

Lubrication

Model C1G pumps are provided with a grease cup or grease gun fitting at the outer

bearing which also lubricates the packing. A good grade of medium cup grease, such

as Fiske Bros. Lubriplate #930 AAA, should be used. Apply until visible at the outer end

of the packing gland. If the pump is overheating, it may be due to lack of lubricant. Add

lubricant as needed or at least every 60 days or 500 hours of operation.

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