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BALANCED BUMPER SUBSInstruction Manual 4455

Balanced Bumper SubsGeneral Description ..................................................... 3Use ............................................................................... 3

In Fishing Operations .............................................. 3Construction ................................................................ 4Operation ..................................................................... 6

When Used in Light Drilling, Milling,or Coring Operations ............................................ 6

When Used in Fishing Operations .......................... 6To Bump Down in the Hole ..................................... 6To Bump a Solid Downward Blow in the Hole ........ 6To Jar Up in the Hole ............................................... 6

Complete Disassembly ................................................ 6Reassembly ................................................................. 8

To Fill the Lubricated Fishing Bumper Sub ............. 8Service Kit .................................................................. 14Strength Data ............................................................. 15Maximum Recommended Tightening Torque

for Threaded Connections .................................... 15Specifications and Replacement Parts .............. 16 – 17

I N

D E

XBalanced Bumper Subs

The designs and specifications for the tools described in this instruction

manual were in effect at the time this manual was approved for printing.

National Oilwell, whose policy is one of continuous improvement, reserves

the right to discontinue models at any time, or to change designs and

specifications without notice or without incurring obligation.

Sixth Printing, April 2004

3

UseThe Bowen Balanced Bumper Sub isespecially well-suited for use in deep,severe fishing operations, or for lightmilling or coring operations. It permitsan immediate bumping action to preventcuttings and cavings from settling andwedging the drilling or fishing string.

The Bowen Balanced Bumper Sub willfree drill pipe and reamers, drill collars,bits and other tools which have becomestuck, lodged or keyseated. The tool canreadily be used to bump repeatedly ineither direction or to bump alternately upand down.

The Bowen Balanced Bumper Sub is anideal tool to be used in coring opera-tions. The bumping action is an effectiveway to break cores sharply and cleanlyto permit easy removal when desired.

In Fishing Operations

Whenever a releasing type fishing tool isto be used, a properly made-up BowenBalanced Bumper Sub should beincluded in the fishing string. It is usuallyinserted in the string immediately abovethe fishing tool safety joint or unlatchingjoint. It insures that the operator has themeans available to release the fishingtool if and when it becomes impossibleto pull the fish.

The Bowen Balanced Bumper Sub willdeliver the sharp downward blow andtransmit the torque required to break thefishing tool engagement to release itfrom the fish. The freestroke also assistsin controlling the weight on the fishingtool while releasing.

Likewise, the Bowen Balanced BumperSub can be used to great advantage torelease a fishing tool from a recoveredfish at the top of the hole, once recov-ered. It simplifies the operation and elim-inates the necessity to resort to awkwardmeasures such as dropping the ele-vators or bumping down with the hook.

General DescriptionThe Bowen Balanced Bumper Sub isengineered to withstand sustainedbumping action in fishing, light milling,and workover operations. The tool isdesigned to permit a 10" to 18" verticalstroke, either upward or downward.

This stroke is always available to theoperator, whether rotating or not. Strokesgreater than 18" can be furnished onspecial request. The Bowen BalancedBumper Sub will transmit full torque at alltimes during rotation and bumpingoperations.

Adequate striking surfaces are providedat the limits of the free movement toproduce the great impact so necessaryto get high quality, positive bumpingaction in either direction.

Specially designed rugged splinesprovide a source of continuous torquetransmission. These splines are always inengagement, whether bumping or not.

The bores permit full circulation at alltimes.

The balance feature which is composedof the Floater in a suitable Floater Bodysurrounding the Washpipe, serves adouble purpose. It balances the externalpressure with the circulating fluid pres-sure; and it serves to allow for volumetricexpansion of the tool working fluid, dueto temperature. This results in freeroperation under extreme conditions ofpressure differential or of temperature,or both. It also results in longer tool life.

Under such adverse conditions theBowen Balanced Bumper Sub will per-form where other tools fail.

Bowen Balanced Bumper Sub

4

ConstructionRefer to the assembly drawing on page 5.

The Bowen Balanced Bumper Sub ismanufactured from carefully selectedhigh grader alloy steel. Each part isprocessed and heat treated in accor-dance with best choice of degree andtype of heat treatment, to suit its use inthe tool. The freestroke also assists incontrolling the weight on the fishing toolwhile releasing.

Careful engineering has eliminated to ahigh degree points of usual high stressconcentration. This assures longdependable service from each tool.

A shoulder type, splined Mandrel fits intoa Mandrel Body with mating splines. TheMandrel is free to move up and down,while simultaneously transmitting torquefrom the Mandrel to the Mandrel Body. Asuitable Knocker and Washpipe aremade up on the lower end of theMandrel.

The Knocker strikes a heavy impact blowagainst the lower end of the MandrelBody when in use. This Knocker isspecially designed with three mainfeatures: its material and heat treatmentare designed to be in optimum balancefor use in impact loading; it is designedto reduce wear to an absolute minimum;and it has been closely fitted to allow freesliding contact with the Middle Body, inwhich it slides, while at the same timelateral movement is restricted to anabsolute minimum. This prevents thehigh frequency lateral vibration which ispresent in most other tools, and which isvery detrimental to the life of the tool.This is wear action, commonly called“chatter.”

The Washpipe is designed to include thesame stabilizing features at its upper endas those described previously. The lowerend, which moves up and down as thetool is stroked, has been specially

hardfaced and ground to a high polish.This reduces frictional wear to a mini-mum where the Washpipe is sealed as itpasses through the Floater, and also theclose fitting stabilizer grooves which arelocated in the Floater Body. The sealpoints of the Mandrel at the top of thetool and the Washpipe at the bottom ofthe tool are equipped with the well-known Bowen patented Seal RingAssembly, consisting of an O-Ring Seal,Non-Extrusion Rings, and Seal ProtectorRings. This Seal Ring Assembly reducesthe normal diametral clearance at theseal point to near zero as hydraulicpressure is applied from either direction.This prohibits the extrusion of the SealRing as would otherwise occur. It alsoreduces O-Ring “roll” to a minimum. Twoof these Seal Assemblies are used intandem in the Bowen Balanced BumperSub. This increases the life of both by aconsiderable margin.

The Middle Body forms a housing for thelubricating oil in which the working partsof the Balanced Bumper Sub function.

It is made up on the Mandrel Body at itsupper end, and to the Floater Body at itslower end.

The Middle Body has a suitable Fill Plugnear the lower end. It has a honed finishinside diameter which is closely fitted tothe outside diameter of the Knocker andWashpipe upper end.

NOTE: The Fill Plug in the lower end of the

Middle Body is not ordinarily used; it is

there because the Middle Body in inter-

changeable with other tools, which do

require use of the Fill Plug.

The Mandrel Body slips over the Mandrelwith the flat end up. It is made up withthe Middle Body at its lower end. TheMandrel Body incorporates splines,which mate with corresponding splineson the Mandrel.

The Mandrel Body has a suitable FillPlug, which, together with the similar FillPlug in Floater Body, allow filling theBalanced Bumper Sub with lubricatingoil. This filling process is described indetail on page 8.

The Mandrel Body also has a series ofstraight, specially designed splines on itsinside diameter and near the lower end.These splines are engaged in slidingcontact with the Mandrel to transmit thetorque imparted by the running stringthrough the Middle Body, Floater Body,Washpipe Body, and the attached tool,that is being operated.

The Floater Body is located betweenthe Middle Body at its upper end, andthe Washpipe Body at its lower end.It houses the Floater which is located insuch a way by the setting tool at assem-bly, as to allow it to move up or downas required, during operation. It has anappropriate Fill Plug, to allow filling thetool with operating fluid. A series ofsplines are located in the upper insidediameter. These splines serve as a fluidpassage and as a lateral stabilizer forthe Washpipe. The inside diameter has ahoned finish, in which the Floater works.

The Floater is a cylinder in form, whichhas seals at its outside and insidediameters. The seals are used in con-junction with the exclusive BowenNon-Extrusion and Seal Protector Rings.

During operations, the Floater is free tomove upward if the differential pressurebetween the circulating fluid and theinternal pressure in the Middle Body isput in imbalance.

It is free to move downward if the tem-perature is great enough to cause anincrease in the volume of the MiddleBody operating fluid, thus accommodat-ing the volumetric change.

5

Middle Body (5)

Washpipe (3)

Washpipe Body (6)

Washpipe Body (8)

Mandrel (1)

Mandrel Body (4)

Washpipe (3)

Knocker (2)

Middle Body (5)

Middle Body Seal - Small (15)

Middle Body Seal - Large (14)

Mandrel Body (4)

Mandrel (1)

Mandrel Seal (4)Main Mandrel Seal (10)Mandrel Body Fill Plug (7)

Fill Plug Seal (9)

Mandrel Seal Protector Ring (11)

Washpipe Seal (16)

Floater Body Fill Plug (8)and Fill Plug Seal (9)

Floater Body Seal - Small (15)Non-Extrusion Ring

Seal Protector RingI.D. Non-Extrusion Ring

Floater Body Seal - Large (14)

Knocker (2)

Floater (4)

Middle Body Seal - SmallMiddle Body Seal - Large

Floater Body (7)Floater (4)

Seal Protector RingO.D. Floater SealFloater Seal

BowenBalanced Bumper Sub

AssemblyExploded View

Main Parts of Balanced Bumper Sub

6

The Washpipe Body is the lowermostpart of the tool. It transmits torque fromthe Floater Body to the running stringand tools located below the BalancedBumper Sub.

The Bowen Balanced Bumper Sub isfurnished standard with a tool joint boxtop connection and a tool joint pin bot-tom connection. These may be reversedor special connections furnished onrequest.

The Bowen Balanced Bumper Sub isdesigned to have a 10" to 18" strokestandard, depending on size. Speciallonger strokes can be furnished up to60" or greater, depending on size.Contact National Oilwell, DownholeTools Division engineering for informa-tion regarding a specific requirement.

OperationWhen Used in Light Drilling,Milling, or Coring OperationsThe Bowen Balanced Bumper Sub isusually installed in the drilling stringimmediately above the drill collars. TheBumper Sub serves several purposes,as mentioned in “USE.” It is an excellentsafety device, particularly when workingin sticky formations, deep holes, whendrilling out cement in heavy mud, or incoring jobs.

When Used in Fishing OperationsThe Bowen Balanced Bumper Sub isusually installed in the fishing stringimmediately above the fishing tool, safetyjoint or unlatching joint.

The Bowen Balanced Bumper Sub’sprimary purpose is to enable the oper-ator to release the fishing tool in theevent it becomes impossible to pull thefish. It will deliver the necessary impactand impart the required torque that isrequired to release the tool from the fish.It will also assist in controlling the weighton the fishing tool while releasing.

There are a number of secondary usesfor the Bumper Sub.

To Release the Recovered Fishat the Top of the HoleThis is accomplished by gripping the fishimmediately below the fishing tool and,after opening the Bowen BalancedBumper Sub, dropping a stand of drillpipe heavily down against the BalancedBumper Sub. This will cause a sharpenough downward blow against thefishing tool to break the “freeze,” afterwhich the fish may readily be removed.In the event that insufficient impact maybe produced by the stand of drill pipe,one or more drill collars may be insertedin place of the drill pipe, and the processrepeated with more effect.

To Bump Down in the HoleElevate the fishing string sufficiently toopen the Balanced Bumper Sub the fulllength of its stroke and take a strain onthe pipe. This will require 10" to 18" toopen the tool. Add enough pull to put apermissible amount of stretch in the drillor fishing string. The permissible stretchwill depend on the size of the pipe andits length above the Bumper Sub.

Drop the string sharply for a distanceequal to the stretch in the string plus9-1/2" to 12", depending on the size ofthe tool; and stop it abruptly with thebrake. If sufficient stretch has been takenin the string, this will cause the lower endof the fishing string, i.e., immediatelyabove the tool, to spring downward,closing the Balanced Bumper Sub. Dueto the elasticity of the string, coupled withthe natural rebound from the strikingsurfaces in the tool, a rapid series ofresonant blows will be delivered to thetool below the Balanced Bumper Sub.

To Bump a Solid Downward Blowin the HoleElevate the string to open the BalancedBumper Sub completely, and take amoderate strain or stretch in the string,plus a permissible stretch in the string.This will require 10" to 18" at the tool plusstretch in the string.

Drop the running string sharply this fullcombined length without any brakingaction. This will cause the BalancedBumper Sub to close quickly. Thisshoulder of the Mandrel will strike theMandrel Body shoulder, transmitting asingle, solid downward blow to the toolbelow the Bumper Sub.

To Jar Up in the HoleElevate the running string sufficiently tostretch it moderately. Then drop thestring a distance equal to the stretch inthe string and stop it sharply with thebrake. This will cause the lower end ofthe string to spring downward, causingthe Balanced Bumper Sub to partlyclose, after which the string will rebound.This will cause the Bumper Sub to re-open quickly and the Knocker will strikethe lower end of the Mandrel Body asolid upward blow.

Complete Disassembly1. Place the Bumper Sub in a chain pipe

vise, clamping the tool at the MandrelBody (5). This has two advantages:the main Mandrel Body is thick walledand will withstand greater forcesexerted upon it, and the entiredisassembly can be accomplishedwith this single clamping.

2. Remove the Floater Body Fill Plug (16)so that oil may start draining from thetool.

Note: Place a suitable open mouthed

receptacle below the tool so that it will

catch the oil as it drains.

7

Figure 1O-Ring Removal with Tool No.625

Insert lip of tool under O-Ring and force O-Ring out of thegroove. Be careful not to damage or distort Seal ProtectorRings or Non-Extrusion Rings. Many operators preferto use O-Ring Tool No. 625 for O-Ring removal due to itsconfiguration.

3. With chain tongs break the WashpipeBody (8) from the Floater Body (7).Uncouple and lay aside.

Back up the Floater Body with asecond wrench, when removing theWashpipe Body.

4. In like manner, break the Floater Body(7) out, and lay it aside.

5. With chain tongs, break the MiddleBody (6) from the Mandrel Body (5).Uncouple, slide over the Washpipe(3) and lay it aside.

CAUTION: Do not scratch or dent the

Washpipe seal surface.

6. Break Washpipe from Mandrel (1)and lay aside. Remove Knocker (2)from Mandrel. Do not damagefinished surfaces.

7. Slide the Mandrel (1) out through thetop of the Mandrel Body (5). Due tothe tight grip of the Seal Assembly, itis sometimes necessary to strike theMandrel to start it out. If so, theMandrel end should be protectedwith a block of hardwood or leadhammer head. Place the blockagainst the end of the Mandrel andstrike the block forceful blows with asledge hammer until the Mandrelbegins to slide.

8. When the Mandrel is free, attach asoft line or wire rope sling just belowthe shoulder, and support the weight,as the Mandrel is removed.

9. Remove the Mandrel and lay it aside.

10. Remove the Mandrel Body (5) fromthe vise, and lay it aside.

11. Examine the Mandrel Seal Assembly,consisting of the Seal (10), SealProtector Ring (11) and Seal Non-Extrusion Ring (12). There are two ofthese Seal assemblies in tandem:one pair in the upper end of theMandrel Body (5) and a pair in theFloater (4). Check this Seal assemblyfor wear or damage. Remove the O-Ring Seals (10), Seal Protector Rings(11) and Non-Extrusion Rings (12)that show signs of wear or havebecome mis-shapen.

To remove these rings, proceed asfollows:

Using either tool No. 626 or No. 625,carefully insert the tip of the bladebetween the O-Ring and the SealProtector Ring. Then lift out the O-Ring, taking care not to damage ormar the Seal Protector Rings or Non-Extrusion Rings. Do not run the toolaround the groove under the Rings.

Avoid damage by scratching theRing grooves. (Refer to illustration,Figure 1.)

12. Clamp the Floater Body in the viseand remove the Floater. This may bedone by utilizing a piece of rod withits end bent to form a hook. The hookmay be passed through the FloaterI.D. and hooked over the end of theFloater to pull it out of the FloaterBody. Remove Fill Plug (16) fromFloater Body (7).

13. Remove the O-Ring Seals, Non-Extrusion Rings and Seal ProtectorRings from the Floater I.D. and O.D.

14. With the O-Ring removed from theabove named assemblies, examinevisually for any distortion or damage.With the forefinger carefully feel theSeal Protector and Non-ExtrusionRings for damage or burrs.

15. Remove all damaged rings.

16. Carefully wash and clean all disas-sembled parts in solvent. Wipe drywith a clean cloth, then thoroughly oilwith a good grade of light clean oil.

17. Check all parts for defects. Examinethe polished surfaces for pits and/orscratches. Any abrasions on thesesurfaces will damage the O-RingSeals, resulting in a loss of fluid dur-ing the operation of the tool. Mandrelor Washpipe polished surfaces thathave become pitted or abraided mustbe replaced with new parts beforereassembly.

18. Check splines on the bottom of theMandrel Body for upset. Upsets maybe ground off with a grinder or with asmall hand file.

8

ReassemblyNOTE: The two Fill Plug Seals (9) should be

replaced before the Fill Plugs (16) are

reassembled. Seals and oil, once removed,

should never be reused.

1. All metal parts should be thoroughlysteam cleaned, or washed inside andout with a good grade solvent; blowndry with shop air, or wiped clean withsoft cloths. The parts should then bethoroughly oiled with a good grade,clean light oil.

NOTE: Always lubricate the threads with

an approved thread lubricant (KOPR-KOTE).

2. Prior to the main reassembly, theBowen Non-Extrusion Seal Assem-blies should be installed in theMandrel Body (5) and Floater (4).This may be done in the followingmanner. (Refer to figures 2 through16 for step by step illustrations.)

Non-Extrusion Rings are installed firstwith their beveled surfaces conform-ing to the beveled surfaces of thegroove. The Seal Protector Rings areinstalled next, deformed slightly topermit entry into the body, thenstraightened and flattened by use ofTool #625. After Non-Extrusion Ringsand Seal Protector Rings are in place,the rubber O-Ring is inserted in themiddle of the assembly between thetwo Seal Protector Rings. The com-plete assembly is then properly setwith a Ring Setting Tool.

3. Repeat the sequence in (2a) abovethrough (2l) for the upper MainMandrel Seal.

4. With both seal Assemblies in placeand pressed into the grooves as bestas possible with your hands and theInstallation Tool #626, use the SealAssembly Setting Tool to set the Sealproperly.

5. After the Non-Extrusion Seal Assem-blies have been installed in bothMandrel Body and Floater as outlinedin 2 through 4 above, use the SettingTool, Figure 14, to conform the SealRings to proper bore size. Refer toFigures 14, 15, and 16.

6. Secure the Mandrel Body (5) hori-zontally in a vise. Coat the insidesurface thoroughly with a good cleanlightweight oil.

7. Install the Washpipe Seal (18) on thelower end of the Mandrel (1).

8. Insert the splined end of the Mandrel(1) through the top of the MandrelBody (5); and, aligning the splines,shove it through the splines in theMandrel Body (5). Push it gentlythrough until the Mandrel bumpsagainst the Mandrel Body. This willbring the polished portion of theMandrel through the Seal Ringassemblies previously described.The Mandrel should slide freely backand forth. If any unusual resistanceis encountered, remove the Mandreland reset the Seal Assemblies orremove any foreign matter. Do notforce the Mandrel, as damage mayresult to the Seal surface.

9. Install the Large Middle Body Seal(14) and Small Middle Body Seal(15).

10. Oil and install the Knocker (2) on theLower Mandrel end. Buck up tight.

CAUTION: The Knocker is designed with

appropriate wrench flats, usually 6. Use

them. DO NOT wrench on the hardfaced

bands between the flats, or gouge them

with the sides of the wrench jaws. These

hardfaced bands are engineered to lend

lateral stabilization to the Knocker when in

service. They are manufactured to close

ground tolerances, and should never be

upset or otherwise damaged. In the event

that they are inadvertantly upset in hand-

ling, remove the upset or burr with a hand

file or fine emery cloth, clean and re-oil.

11. Screw the Washpipe (3) onto theMandrel. Buck up tight. Use the samecare with the Washpipe as describedfor the Knocker. It also is designedwith stabilizer bands.

12. Coat the Washpipe (3) thoroughlywith light oil.

13. Slide the Middle Body (6) over theWashpipe and lower Mandrel end,and make it up with the MandrelBody. Make it up tight.

14. Assemble the Large (14) and Small(15) Floater Body Seals on theFloater Body (7). Screw the FloaterBody (7) into the lower end of theMiddle Body (6), and buck it up tight.

15. With new seal assemblies in place,slip the Floater (4) into the FloaterBody (7).

16. Using the Floater Setting Tool, posi-tion the Floater (4), by screwing thethreaded portion of the FloaterSetting Tool into the lower end of theFloater Body(7), allowing the Floater(4) to be shoved into position aheadof the setting tool.

Leave the Floater Setting Tool in posi-tion while filling the Balanced BumperSub. The Sub should be filled prior tocompleting the assembly.

To Fill theBalanced Bumper SubProp the assembled tool up at approxi-mately a 30° angle with the Mandrel endup. Have both the Floater Body Fill Plug(16) and Mandrel Body Fill Plug (9) atthe top, if possible. Attach the ExhaustHose Assembly (Part No. 671) to theMandrel Body Fill Plug hole, and theVolume Pump Hose (Part No. 2581) to

the Floater Body Fill Plug hole. Placethe free end of the Exhaust Hose into areceptacle. Fill the Volume Pump (PartNo. 2580) with oil and connect it to theVolume Pump Hose.Pump into the tool at a moderate speedto allow uniform smooth flow of oil.

As the tool fills, oil will begin to flow outthe Exhaust Hose. Air bubbles will beobserved in the exhaust oil. Continueto pump until all air bubbles cease toappear in the outflowing oil.

When air bubbles cease, immediatelydetach the Exhaust Hose, and insert theFill Plug (16) in the Mandrel Body (5).Tighten this Fill Plug good and snug, butnot excessively tight. It is good practiceto pump up a moderate pressure intothe tool several times, allowing it to bleedback into the Volume Pump. This is aneffective way to bleed off any residual air.

NOTE: To assure that the Floater has been

caused to seat against the Floater Setting

Tool, with the Mandrel Body Fill Plug (16)

in place, pump up the pressure as much

as can be conveniently produced by hand

pumping. The remainder of the parts may

now be assembled.

18. Remove the Floater Setting Tool fromthe Floater Body.

19. Assemble the Large Floater BodySeal (14) and Small Floater BodySeal (15) on the upper end of theWashpipe Body (5).

20. Slip the Washpipe Body over theWashpipe (3). Use the same care asdescribed in (9) for the Mandrel. Buckup tight in lower end of the FloaterBody (7).

The tool will now be ready for service.

Before the tool is actually put in service,it should be worked back and forthseveral times to assure that it is function-ing properly and that all seals are leak-proof.If the tool is to be stored for future ser-vice, the tool joints should have a goodgrade thread dope applied and threadprotectors installed. The outside of thetool should be cleaned and painted or agood heavy coat of grease applied priorto storage. If the climate is very dampor salty, the bore should be thoroughlygreased.

NOTE: Any good grade medium weight

lubricating oil will serve the Balanced

Bumper Sub. Best results are obtained from

SAE 70 weight, non-foaming lubricating oil;

and this is recommended.

This recommendation may be modifiedto allow a lighter weight oil in small Subsused in relatively low temperature andheavier weight oil in very deep holes,high temperature conditions or very largeSubs.

NOTE: National Oilwell has available a

special viscosity index oil which is parti-

cularly well suited to service in very high

well temperatures. This oil is available at

extra cost on request.

The oil used to fill the Balanced BumperSub should be completely clean and freefrom foreign matter. Never reuse oil orseals when assembling a Bumper Sub.

9

Bowen Balanced Bumper Sub During Assemblywith Floater Setting Tool in Position

Washpipe Body

Washpipe

Knocker

Middle Body

Middle Body Seal (Small)

Middle Body Seal (Large)

Mandrel

Mandrel Body

Mandrel Seal Non-Extrusion Ring

Main Mandrel Seal

Mandrel Body Fill Plug

Fill Plug Seal

Mandrel Seal Protector Ring

Washpipe Seal

Middle Body Seal (Small)

Floater Body Seal (Small)

O.D. Floater SealSeal Protector RingNon-Extrusion Ring

Floater Body Seal (Large)

Middle Body Seal (Large)

Floater Body Fill Plug & Seal

Floater BodyFloaterI.D. Non-Extrusion RingSeal Protector RingFloater Seal

Floater Setting Tool forBowen Balanced Bumper Sub

10

Installation of Non-Extrusion Ringsa. Carefully examine each Non-Extrusion Ring before installation

and remove any burrs or rough edges with a small hand file.

Figure 2

b. Hold Non- Extrusion Ring between thumbsand forefingers.

Figure 3

c. Overlap ends until diameter is small enoughto fit inside body.

Figure 5

e. Using thumbs, press Ring into groove untilends match up and Ring is firmly seated ingroove.

Figure 4

d. Place edge of Ring opposite the split into thelower groove and spread from center towardends. Be sure beveled side of Ring matchesbeveled groove side.

11

Installation of Seal Protector Rings

Figure 6

f. Figure 6 shows Ring before beingbent. It will look like this after it isproperly installed in the groove.

Figure 7

g. Bend the Ring until it is small enoughto allow entry into bore.

Figure 8

h. Insert one edge in groove. Then insertthe opposite edge and press downuntil entire Ring is in place.

Figure 9

i. Use Seal Protector Ring installationtool to straighten and flatten Ring bypressing against Ring as shown.

12

Installation of O-Ring Packing

Figure 12

l. Insert O-Ring between Seal ProtectorRings in each groove.

Figure 11

k. Bend O-Ring as shown to insertin groove

Figure 10

j. Figure 10 shows O-Ring packingbefore installation.

13

Setting Seal Ring Assemblies

Figure 16

c. Tap several times around periphery oftool as shown to set Rings. Continueuntil both Ring Assemblies are seated.Then remove tool and continue assembly.

Figure 15

b. Insert the Setting Tool as shown, usingany convenient rod or bar to hold tool.

Figure 14

a. Use the Setting Tool from the ServiceKit (see page 14) to seat the Seal RingAssemblies after installation.

Figure 13

This illustration shows the location ofparts of the patented Bowen Seal RingAssembly.

Non-Extrusion Ring

Seal Protector Ring

O-Ring

14

Bowen Balanced Bumper Sub Service Kit

A Bumper Sub Service Kit is necessary to properly service the Bumper Sub. These Kitsare identical for every size of Bumper Sub, so one kit may be used for any number ofsubs. The kit does not include any Seal Setting Tool, two of which are required for eachsize Bumper Sub. These tools must be ordered separately. They are usually stored in theService Kit.

Volume PumpNo. 2580

Volume Pump HoseNo. 2581

Exhaust HoseNo. 33435

Mandrel BodySetting Tool

(extra)

Seal Protector RingInstallation Tool

No. 625

O-RingInstallation Tool

No. 626

Mandrel BodyFill Plug Wrench

No. 359

Middle BodyFill Plug Wrench

No. 620

NippleNo. 36953

ReducingRight-Angle Adapter

No. 56564

Metal BoxNo. 1995

Filter ElementNo. 56566 (extra)

BushingNo. 56563

Line FilterNo. 56565

Tube FittingNo. 33436

AdapterNo. 674-B

Volume PumpRepair KitNo. 53266

(extra)

Adapter (3/8)No. 657-A

Male CouplerNo. 656

Female CouplerNo. 655

SubNo. 2582

AdapterNo. 674-A

Adapter (1/4)No. 657-B

NOT INCLUDED IN SERVICE KIT

15

Strength Data – Bowen Balanced Bumper SubAssembly Tool Connection Tensile Strength Torque Max. Operating

No. OD x ID (in) @ Yield (lb) @ Yield (ft-lb) Torque (ft-lb)

44252 4-1/4 x 1-15/16 2-7/8 API I.F. 397,650 9,280 4,640

41228 4-5/8 x 2 3-1/2 API F.H. 484,650 11,060 5,530

41228 4-3/4 x 2 3-1/2 API F.H. 484,650 15,000 7,500

42042 6-1/4 x 3-1/8 4-1/2 API I.F. 777,150 29,220 14,610

39975 6-3/4 x 2-3/4 5-1/2 API Reg. 1,130,400 35,380 17,690

42126 7-3/4 x 3-1/2 6-5/8 API Reg. 1,276,950 50,040 25,020

The above tensile strengths are calculated theoretical yield strengths and are accurate to ± 20%. The above operating torque is setat 50% of the calculated theoretical yield torque and is the maximum recommended operating torque.

These figures do not constitute a guarantee, actual or implied; they are meant to serve as a guide only, and appropriate allowancemust be made in use as a safety factor.

Maximum Recommended Tightening Torque

for Threaded ConnectionsTool Mandrel Body Floater Body Floater Body Mandrel Mandrel

Assembly O.D. X I.D. to to to to to

No. (in) Middle Body Middle Body Washpipe Body Knocker Washpipe

(ft-lbs) (ft-lbs) (ft-lbs) (ft-lbs) (ft-lbs)

44252 4-1/4 x 1-15/16 4,640 4,640 4,640 670 730

41228 4-5/8 x 2 5,530 5,530 5,530 1,100 1,790

41228 4-3/4 x 2 7,500 7,500 7,500 1,100 1,790

42042 6-1/4 x 3-1/8 16,330 14,610 15,280 3,120 8,300

39975 6-3/4 x 2-3/4 22,660 20,630 17,690 3,000 9,200

42126 7-3/4 x 3-1/2 29,190 29,190 25,020 7,690 21,000

The above makeup torques are the maximum recommended makeup torques for each connection. They are set at

50% of the calculated theoretical yield torque. Torques this high are not required for all fishing jobs, and lower values

will result in less wear and tear to the threads.

The tightening torque values were calculated assuming Itcolube or similar zinc based grease on all threads and

shoulders.

16

Bowen Balanced Bumper Subs2-7/8 3-1/2 4-1/2 5-1/2 6-5/8

Size Connection A.P.I. A.P.I. A.P.I. A.P.I. A.P.I.

I.F. F.H. I.F. Reg. Reg.

Outside Diameter - Inches 4-1/4 4-3/4 6-1/4 6-3/4 7-3/4

Inside Diameter - Inches 1-15/16 2 3-1/8 2-3/4 3-1/2

Stroke - Inches 15-1/2 15-1/2 18 18 18

Full Bore* *

Complete Assembly Part No. 44252 41228 42042 39975 42126

Weight 297 410 684 786 1179

Replacement Parts Mandrel Body Part No. 43532 39861 34966 33244 34992

Weight 45 62 77 99 140

Middle Body Part No. 43533 33156 34967 33245 34993

Weight 40 50 88 103 113

Floater Body Part No. 44253 41231 42045 39977 42127

Weight 20 33 48 57 80

Washpipe Body Part No. 44256 41234 42048 39978 42128

Weight 67 74 126 148 161

Mandrel Part No. 43536 39860 34970 33248 34996

Weight 88 105 191-1/2 250 292

Part No. 44255 41233 42047 39976 42129

Floater Weight 3-1/2 4 4-1/2 5 6

Part No. 44254 41232 42046 39979 42130

Washpipe Weight 50 60 110 157 230

Part No. 43538 39863 34972 33250 34998

Knocker Weight 6 6-1/2 7 8 8

Main Mandrel Non- Part No. 365-40 365-42 365-53 365-54 365-61

Extrusion Ring (4 Req’d.)

Main Mandrel Seal Part No. 375-40 375-42 375-53 375-54 375-61

Protector Ring (4 Req’d.)

Floater O.D. Non- Part No. 216-42 216-44 216-55 216-58 216-65

Extrusion Ring (4 Req’d.)

Floater O.D. Seal Part No. 227-42 227-44 227-55 227-58 227-65

Protector Ring (4 Req’d.)

Floater I.D. Non- Part No. 365-42 365-42 365-53 365-54 365-61

Extrusion Ring (4 Req’d.)

Floater I.D. Seal Part No. 375-42 375-42 375-53 375-54 375-61

Protector Ring (4 Req’d.)

Part No. 44258 41235 42049 39988 42133

Seal Packing Set Weight 1 1 1-1/2 2 2

Mandrel Body Part No. 329 329 329 329 329

Fill Plug Weight 1/8 1/8 1/8 1/8 1/8

Middle Body Fill Plug Part No. 617 617 617 617 617

(2 Req’d.) Weight 1/8 1/8 1/8 1/8 1/8

Many other sizes available upon request.

17

Bowen Balanced Bumper SubsComplete Assembly Part No. 44252 41228 42042 39975 42126

Weight 297 410 684 786 1179

Required Accessories - Extra Part No. Only One Service Kit Required To Service All Sizes of Tools —

Service Kit Weight Does Not Include Any Seal Setting Tool, Which Must be Ordered Separately

As Required for Each Tool, at Extra Cost.

Main Mandrel Part No. 22709-40 22709-42 22709-53 22709-54 22709-61

Setting Tool

Floater Setting Tool Part No. 44261 41237 42051 39987 42132

Weight 8 9 13 20 35

Thread Lubricant (KOPR-KOTE) Part No. 153823

Seal Packing Set Part No. 44258 41235 42049 39988 42133

Consists of: Weight 1 1 1-1/2 2 2

Main Mandrel Seal (2 Req’d.) Part No. 568337 568339 568426 568427 568434

Floater O.D. Seal (2 Req’d.) Part No. 568339 568341 568428 568431 568438

Floater I.D. Seal (2 Req’d.) Part No. 568337 568339 568426 568427 568434

Middle Body Seal - Part No. 568239 568242 568253 568256 568261

Large (2 Req’d.)

Middle Body Seal - Part No. 568237 568239 568251 568254 568260

Small (2 Req’d.)

Floater Body Seal - Large Part No. 568239 568242 568253 568256 568261

Floater Body Seal - Small Part No. 568237 568239 568251 568254 568260

Middle Body F.P. Seal Part No. 568005 568005 568005 568005 568005

(2 Req’d.)

Mandrel Body F.P. Seal Part No. 568006 568006 568006 568006 568006

Washpipe Seal Part No. 568227 568229 568239 568238 568246

How to Order Recommended Spares:Specify: (1) Name and Number of Assembly or Part. (1) 1 Service Kit

(2) Size and Type Connection, if other than Standard. (2) 6 Seal Packing Sets(3) Outside Diameter, if other than Standard. (3) 8 Middle Body Fill Plugs(4) Any Spares, Optionals or Extras desired, by Name and Number. (4) 4 Mandrel Body Fill Plugs

(5) 16 Main Mandrel Non-Extrusion Rings(6) 16 Main Mandrel Seal Protector Rings

Miscellaneous O-Ring Seals are normally furnished in sealed plastic bags of 10,25, or 100 pieces (7) 4 Mandrel Body Fill Plugs each to prevent deterioration. Other quantities will be furnished in unsealed packages. Packing (8) 16 Floater O.D. Non-Extrusion Rings Sets, however, will always be furnished in sealed plastic bags. (9) 16 Floater O.D. Seal Protector Rings

(10) 16 Floater I.D. Non-Extrusion Rings(11) 16 Floater I.D. Seal Protector Rings(12) 1 Main Mandrel Setting Tool(13) 1 Floater Setting Tool

w w w . n a t o i l . c o m© Copyright 2004 National Oilwell

PDF/0416

MANUAL NO. 4455 R1

w w w. c u s t o m e r. s e r v i c e @ n a t o i l . c o m

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