load cell m-b

8/20/2019 Load Cell M-B

http://slidepdf.com/reader/full/load-cell-m-b 1/32

Operating Manual

Load CellM/B & Pancake

Issue/Rev. Date: 07 2008 ALL EARLIER REVISIONS OBSOLETE

This Operating Manual is valid for the following load cell types:Load Cell Make/Break LC 1.0-2.0 LC-Pan 30k

LC-Pan 10k

Keep this manual for future reference!



of 32 Rev. 07 2008 Operating Manual

L o a d C e l l M / B

& P a n c a k e


& P a n c a k e

Publisher: Weatherford Oil Tool GmbHHainhäuser Weg 150

D -30855 Langenhagen

+49 (0)511-7702-0

FAX +49 (0)511-7702-187

WEATHERFORD OPERATING MANUAL

TERMS AND CONDITIONS OF USE

A. The materials contained in this Weatherford Operating Manual are protected by

copyright, trademark and other forms of proprietary rights. Nothing contained herein

shall be construed as conferring any license or right to use or practice any copyright,

trademark, patent or other forms of proprietary rights. This Operating Manual may not

be copied or converted to any mechanical, electronic or machine readable form, in

whole or in part, without Weatherford’s consent.

B. This Operating Manual is not intended to address every issue that may arise in the

course of operations of the device described therein or the planning of same. Each

well and each job are unique and have numerous variables. Experience and other

specialized training can complement the materials used in this Operating Manual.

C. Weatherford makes no representation as to the accuracy or completeness of the

materials in this Operating Manual. All materials are provided “AS IS” WITHOUT

WARRANTY OF ANY KIND WHATSOEVER, EITHER EXPRESS OR IMPLIED,

INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-

INFRINGEMENT. Weatherford expressly disclaims all responsibility for the

consequences, direct, indirect, consequential or otherwise, of any errors or omissions

in the materials.

D. This information is confidential and proprietary property of Weatherford. Do not

disclose to unauthorized parties. Do not use except as permitted by Weatherford.

Copyright 2008 Weatherford. All rights reserved.

Equipment part no.: 5610681 - 88 Last modified: 04 July 2008

Document part no.: 9991012 Doc. dwg. no.: 5.38.2012 A



Operating Manual Rev. 07 2008 of 32


&

P a n c a k e

L o a d C e l l M

/ B

&

P a n c a k e

Contents Page

1 Safety............................................................5

1.1 DESIGNATED USE............................................5

2 Transportation..............................................6

2.1

INSTALLATION ..................................................6

2.1.1

Tong type M/B – FF (free-floating

Backup).................................................8 2.1.2

Tong type with fixed Backup.................9

2.1.3

Tong type without Backup...................10

2.1.4

Electrical Connection ..........................11

2.1.5

Final Check.........................................11

2.2

CALIBRATION..................................................12

3 General Description...................................15

3.1

LOAD CELL ......................................................15

3.2

PASSIVE LOAD CELL......................................16

3.3 ACTIVE LOAD CELL........................................16

3.3.1

Software Version 1.04 or earlier .........17

3.3.2

Software Version 1.05 or later ............ 18

3.3.3


3.3.4


3.3.5


3.4

SYSTEM COMPONENTS ................................19

3.5 TECHNICAL DATA...........................................19

3.6

CONNECTORS ................................................20

4 Operation....................................................21

5 Placing out of Operation ...........................21

6

Service and Maintenance..........................22





& P a n c a k e


& P a n c a k e

Contents Page

7 Troubleshooting........................................ 23

8 Appendix.................................................... 24

8.1

PARTS LISTS...................................................24

8.1.1

Load Cell.............................................24

8.1.2

Load Cell Bodies.................................25

8.2

COLOR CODING..............................................26

8.3 TYPE PLATE ....................................................27

8.4 CERTIFICATES................................................28





&

P a n c a k e

L o a d C e l l M

/ B

&

P a n c a k e

1 SAFETY

1.1 DESIGNATED USE

The Weatherford Load Cell M/B & Pancake is a measuring

cell for tension and compression force measurements, i. e.

to measure the Make-up or Break-out torque. It is designed

intrinsically safe and thus only for use in combination withintrinsically safe certified interfaces.

The mechanical interface (i. e. the pad eyes’ distance and

diameter) of the M/B type is designed to fit into most

Weatherford tongs, while the Riser type is designed

exclusively for the Weatherford Riser Tong. The Pancake

type can be used for general purposes, i.e. to adapt custom

type tongs to Weatherford JAM systems.

Using the Load Cell M/B & Pancake for purposes other than

mentioned above is considered contrary to its designated

use and is therefore prohibited. The manufacturer cannot be

held liable for any damage resulting from such use. The risk

of such misuse lies entirely with the user.

Never make any modifications, additions or conversions

without the manufacturer’s approval in writing.





& P a n c a k e


& P a n c a k e

2 TRANSPORTATION2.1 INSTALLATION

CAUTION

Never use a load cell with a measuring range

not corresponding to the torque of the tong.

If the range is too small, the load cell will be damaged due to

overload.

If the range is too wide, measurements will be incorrect and

tong handling problems such as overtorque may occur.

Best results are obtained if the maximum torque of the tong

is approx.15% less than the range of the load cell. Use the

following formula to determine the max. torque of the tongsuitable to the load cell:

max. Torque = LC range * Arm length

Example:

max. Torque [ftlbs] = 10 000 [lbs] * 3 [ft] = 30 000 ftlbs

max. Torque [ftlbs] = 10 [klbs] * 36 [in]/12 [in/ft]

= 30 000 ftlbs (inch converted to foot)





&

P a n c a k e

L o a d C e l l M

/ B

&

P a n c a k e

Use this version of the formula to determine the load cell

range suitable for a tong max. torque:

LC range = max. Torque /Arm length

Example:

LC range = 30 000 ftlbs/3 [ft] = 10 000 [lbs]

LC range = 30 000 ftlbs * 12 [in/ft]/36 [in]

= 10 [klbs] (inch converted to foot)

Different tong types require suitable load cells according to

the table below.

Tong Type Load Cell [klbs]

Casing Tong 14.5-50 30

Casing Tong 16K-25 15

Drill Pipe Tong 8.5-80 50



Tubing Tong 7.6-15 10

Tubing Tong 7.6-30 30


Combined Drill Pipe/Tubing Tong 6.5-30 30

Tubing Tong 5.5-15 10 (15)





& P a n c a k e


& P a n c a k e

2.1.1 Tong type M/B – FF (free-floating Backup)

Install load cell according to the instructions in the tong

operating manual.

For make-up mode, it is usually installed on the left side

(tension measurement).

If at the same time a Martin Decker hydraulic load cell

is used, the Load Cell M/B can also be installed on theright side (compression measurement).

Install the electrical amplifier in such a way that the

connector and cable do not interfere with tong

operation, i. e. the cable usually leads to the rear.

Make sure to use the correct bushings (i. e. thebushings shipped with the Load Cell M/B) for the tong

in use. The type of bushings to use depends on the

size of the tong’s bolts.

Fasten the fixing nuts not too tightly. The pad eyes

must just allow a little movement.

WARNING

Make sure there is no bending moment at all on

the load cell.

This is to prevent damage that may cause

serious injuries.

When the load cell works in compression mode during break-

out, it may be subjected to a bending moment. If a load cell isbent, the measured values are incorrect. To prevent this; a pair





&

P a n c a k e

L o a d C e l l M

/ B

&

P a n c a k e

of special centering bushings is shipped together with all new

load cells. These must be in compression mode to prevent

incorrect measurements and possible damage to the load cell.

If your load cell was delivered without centering bushings,

contact Weatherford Germany for reworking.

2.1.2 Tong type with fixed Backup

Install load cell between the mounting bolt at the rear of

the tong.

Also read the instructions in the tong operating manual.

Install the electrical amplifier in such a way that the

connector and cable do not interfere with tong

operation, i. e. the cable usually leads to the rear.

Make sure to use the correct bushings (i. e. the

bushings shipped with the Load Cell M/B) for the tong

in use. The type of bushings to use depends on the

size of the tong’s bolts.

Fasten the fixing nuts not too tightly. The pad eyes

must just allow a little movement.

WARNING

Make sure there is no bending moment at all on

the load cell.

This is to prevent damage that may cause

serious injuries.





& P a n c a k e


& P a n c a k e

When the load cell works in compression mode during break-

out, it may be subjected to a bending moment. If a load cell is

bent, the measured values are incorrect. To prevent this; a pair

of special centering bushings is shipped together with all new

load cells. These must be used in compression mode to

prevent incorrect measurements and possible damage to the

load cell.

If your load cell was delivered without centering bushings,

contact Weatherford Germany for reworking.

2.1.3 Tong type without Backup

For this type install the load cell on the tong and fix it to

rig tie-off using a backup line and shackle.

Make sure that the angle between tong working

direction and the backup line is near to 90°, otherwise

there would be an increase of failure in measurement.

WARNING

Make sure the load cell does not touch the tongbody in order to prevent bending forces

affecting the load cell. If necessary, use asecond shackle at the tong.

Also, a twisting steel cable may cause a torsionmoment damaging the load cell. To avoid that,

use a swivel or install an additional hydraulic

load cell.

Incorrect measurement values may lead todamage and serious injuries.





&

P a n c a k e

L o a d C e l l M

/ B

&

P a n c a k e

Make sure the connector of the electrical amplifierleads to the rear.

2.1.4 Electrical Connection

After mechanical installation connect the load cell to the

torque measuring system using an Ex-proof load cell cable.

For JAMPro and ExTG, this cable is available as part no.

561 0901. For all others contact Weatherford Germany for

assistance.

2.1.5 Final Check

After installation and establishing the electrical connection,

check the load cell functions on the torque measuring

system (e. g. JAMPro, ExTG, HiPer). See the systemoperating manual for information on load cell indicator

settings, pipe data and torque values.





& P a n c a k e


& P a n c a k e

2.2 CALIBRATIONWe recommend to have the load cell always recalibrated by

Weatherford, Langenhagen, Germany. The ISO 9000-

certified service provides the best results.

However, if it is necessary to calibrate the load cell by

yourself, proceed as follows:

Make sure the following tools and accessories are on

hand:

• A programming tool, e. g. an USPI-H

(part no. 5614722).

• A certified weight corresponding to the max. torque of

the tong.

• A lifting device able to carry the full weight of the

entire system times 2.3 (safety factor).

• An ex-proof multimeter suitable for 4..20 mA.

Or:

• An LC Field Calibrator (part no. 561 5560 or

part no. 5615565).

Install the load cell in line with the certified weight or the

reference load of the LC Field Calibrator.

Connect the programming tool or the calibration

computer of the Field Calibrator to the load cell.

Check the communication between programming toolor calibration computer and load cell.





&

P a n c a k e

L o a d C e l l M

/ B

&

P a n c a k e

If you use a programming tool:

Check the zero point with no load. The multimeter must

indicate 4 mA. If it doesn’t, readjust the zero point.

For this purpose follow the instructions in the operating

manual of the programming tool.

Check the maximum value of the measurement range

by lifting the certified weight. The programming tool

must indicate 20 mA. If it doesn’t, readjust it.

For this purpose follow the instructions in the operating

manual of the programming tool.

If the measurement range was readjusted (see

previous step), repeat the zero point adjustment andthe maximum measurement range adjustment as

described in the previous two steps above.

If the software version of your load cell is older than

2.00, repeat the two adjustment steps as often as

required (usually once or twice) to obtain the setpoint

values within 0.5% tolerance of maximum torque.

If the software version of your load cell is 1.10 or higher

you have to carry out the above mentioned procedure

for tension and for pressure. For more details see the

operating manual of the USPI-H.





& P a n c a k e


& P a n c a k e

If you use an LC Field Calibrator instead of the programming

tool:

Record a graph using the Field Calibrator. For detailed

instructions see the LC Field Calibrator Operating

Manual.





&

P a n c a k e

L o a d C e l l M

/ B

&

P a n c a k e

3 GENERAL DESCRIPTION3.1 LOAD CELL

The Weatherford Load Cell M/B is a general purpose

electrical measuring cell for tension and compression force

measurements. Based on the well-known strain gauge

method, it offers typically very good accuracy and

temperature behavior. The pad eyes are designed to fit into

most Weatherford tongs. Bushings for several bolt diameters

are included as accessories with the load cell. In such an

application the Load Cell M/B may be used to measure the

applied torque i.e. for JAM functionality.

The Load Cell M/B is available with the following electrical

interfaces:

• passive resistor bridge with 4- or 6-wire connection, to be

used with an external bridge amplifier (only on request)

• 4..20 mA interface with integrated amplifier with automatic

tension/compression switch

(normal interface, available by part no.)

The Load Cell M/B passive is designed for an operating

temperature range of -30° C to +70° C. The Load Cell M/B

active is designed for an operating temperature range of -

25° C to +70° C. The device is ATEX certified for gas

explosion protection type Ex ia IIC T4 for use inside

hazardous areas zone 1. The ambient protection class is at

least IP65 for use in rough environments. If connectors are





& P a n c a k e


& P a n c a k e

not connected properly, protection caps must be used to

retain the protection class.

3.2 PASSIVE LOAD CELL

(available on request)

3.3 ACTIVE LOAD CELL

The integrated amplifier converts the sensitive strain gauge

bridge signal into a robust 4-20 mA current loop, which can

be utilized in the typical way using an intrinsically safe

current loop front end transmitter. A second circuit is

provided for communication with the integrated

microcontroller, i.e. to calibrate the load cell or to set the

mode (make/break). That control loop uses a special

Weatherford interface and can be used only in conjunction

with any Weatherford programming tool or field calibrator.

A typical disadvantage of all currently available loop load

cells is that they can measure only one direction of the

applied force, tension or compression. If the signal reachesvalues below zero (negative force) the resulting output

current falls below 4 mA and can not be recorded by typical

transmitters. Some cells are available with shifted zero point

to be able to measure also a force change, but this is not

compatible with industry standards and may therefore be a

source of problems.





&

P a n c a k e

L o a d C e l l M

/ B

&

P a n c a k e

The Weatherford Load Cell M/B Amplifier eliminates this

problem. In auto mode it detects the zero point and switches

its amplification direction accordingly. The result is always a

recordable 4-20 mA signal, which eliminates the need for

any further action if the usage is changed from tension to

compression and backwards.

This automatic mode is factory-preset. It is possible toswitch off the automatic mode and choose a dedicated make

or break mode. For that you need a Weatherford

programming tool or field calibrator. Once the automatic

mode is switched on or off, the load cell stays in this mode

until you decide otherwise, even after power up. The

programming tool or field calibrator also allows zero pointsetting and (in case of field calibrator) calibration factor

adjustment.

3.3.1 Software Version 1.04 or earlier

In automatic mode, if the current of the load cell drops below

3.7 mA for more than 1 s, the direction is changed. Then the

program waits for 1 s. Afterwards the check starts again.

If the automatic mode is switched off, the load cell switches

to make direction after power-up.

If your load cell is not equipped with a colored tag, you

probably have this software release. We strongly

recommend to contact Weatherford Germany for a





& P a n c a k e


& P a n c a k e

recalibration and software update at your earliest

convenience.

3.3.2 Software Version 1.05 or later

In automatic mode, if the current of the load cell drops below

3.95 mA for more than 20 ms, the direction is changed.

Then the program waits for 10 ms. Afterwards the check

starts again.


If the automatic mode is switched off, after power-up the

load cell switches to the last setting before power-down.

3.3.4 Software Version 1.10 or laterThese load cells have two different parameter sets, one for

tension and one for pressure.


These load cells have a new type of amplifier. One of the

advantages is that, if you calibrate the zero point or the finalvalue, these values do not influence one another. Therefore

the calibration cycle need not be repeated.





&

P a n c a k e

L o a d C e l l M

/ B

&

P a n c a k e

3.4 SYSTEM COMPONENTSThe system consists of the load cell and the load cell cable.

3.5 TECHNICAL DATA

Outer dimensions: depend on specific design; see

separate sheet

Pad eye inner dimension: 6 klbs-50 klbs: 30 mm

100 klbs: 35 mm

Pad eye bushings for 6 klbs-30 klbs loadcell:

Inner dimension: Backup side: 20 mm

Tong side: 20 mm/25 mm

Force range: 6 klbs, 10 klbs, 15 klbs, 30 klbs,

50 klbs (M/B type)

100 klbs (Riser Type)

10 klbs, 30 klbs (pancake type)

(other forces on request)

Electrical interface: passive: resistor bridge,

4- or 6-wire (on request)

4..20 mA 2-wire current loop,

intrinsically safe ATEX data see certificate

Temperature range: active load cell -25°C to +70°C

passive load cell -30°C to +70°C

Protection type: IP 65

Approval: II 2 G EEx ia IIC T4

TÜV 03 ATEX 2044(USCG accepted)





& P a n c a k e


& P a n c a k e

3.6 CONNECTORSPin assignment of load cell connector

A+ / D- 4...20 mA Output, 2 wire current loop

C+ / B- Communication, 2 wire current loop

E Ground, shielding





&

P a n c a k e

L o a d C e l l M

/ B

&

P a n c a k e

4 OPERATIONBefore operating the tong and the measurement system, the

measurement system must be calibrated and a functional

test of the tong must be carried out, preferably at the

workshop.

The functional test of the tong comprises of operating all

tong functions at least once. See the tong operating manual

for details.

Make sure all connections between tong and JAMPro are

established and the electrical power supply is switched on.

To operate the measurement system, also make sure to

follow the instructions in the JAMPro operating manuals.

5 PLACING OUT OF OPERATION

Disconnect all cables and uninstall the load cell. Mount the

protection cap of the socket.

Check the equipment for damage. Replace damaged

components immediately.

Keep all equipment clean and store it properly so that it is

ready for the next job.





& P a n c a k e


& P a n c a k e

6 SERVICE AND MAINTENANCEMost important is to keep the calibration of the load cell up

to date. We recommend to check and re-calibrate the load

cell at least annually. For this purpose we offer a calibration

service including a manufacturer’s calibration accuracy

certificate. If required we can also apply a state-controlled

certification to your load cell.

You can also calibrate the load cell by yourself using the

Weatherford load cell field calibrator, which includes the

mechanical setup with a reference load cell for the force

application and also a calibration computer to set up your

load cell and to document the measurement or calibration on

a PC.

Prevent trouble with the pad eyes of the load cell and grease

both pad eyes if dismounted.

Note that pad eyes not moving easily cause bending forces

and thus possibly incorrect measurements.





&

P a n c a k e

L o a d C e l l M

/ B

&

P a n c a k e

7 TROUBLESHOOTING In case of malfunction check the cable connections

first. If there is any damage, replace the cable with a

new one.

Then check for a mechanical problem.

Is the load cell mounted in the specified way? Look into

the corresponding tong operating manual. Use the

appropriate bushings to prevent damage.

Check if the electronics is working i. e. by connecting

another load cell to it.

If none of the above steps solves the problem, the load cell

itself may be damaged. Send it to Weatherford Germany for

repair.

The electrical measuring cell of the load cell contains no

parts which can be replaced by the user in case of

malfunction. It may only be repaired by the manufacturer.

Prevent trouble with the pad eyes of the load cell on next job. Keep load cell always clean if dismounted and grease

both pad eyes after each job.





& P a n c a k e


& P a n c a k e

8 APPENDIX8.1 PARTS LISTS

8.1.1 Load Cell

Parts list – Common parts for M/B load cell types

Item Description Qty. Part No.

1 CONNECTOR LC CABLE TESTER 1 561 49132 DUST CAP FOR P/N 561 4913 1 561 4914

3 PLAIN FLAT GASKET 1 561 2290

4 BUSHING, TORQUE GAUGE 1 561 0697



7 CENTERING BUSHING 2 561 06788 CAPSCREW 4 519 2421

9 WASHER, TOOTHED LOCK 2 5180305

10 PAD EYES FOR 6 -50KLBS 2 5222235

Parts list – Parts for load cell type Pancake

Item Description Qty. Part No.

2 CONNECTOR LC CABLE TESTER 1 561 4913

3 DUST CAP FOR P/N 561 4913 1 561 4914

4 PLAIN FLAT GASKET 1 561 2290

5 CAPSCREW 4 519 0003

7 LOAD CELL FLANGE 1 561 0677

8 SEAL FOR LOAD CELL 1 561 0674





&

P a n c a k e

L o a d C e l l M

/ B

&

P a n c a k e

8.1.2 Load Cell Bodies





& P a n c a k e


& P a n c a k e

8.2 COLOR CODING

Load cells are marked with a colored plastic plaque to

indicate the measuring range. See table below for details.

Range Color6 klbs white

10 klbs yellow15 klbs red30 klbs blue50 klbs black





&

P a n c a k e

L o a d C e l l M

/ B

&

P a n c a k e

8.3 TYPE PLATE





& P a n c a k e


& P a n c a k e

8.4 CERTIFICATES





&

P a n c a k e

L o a d C e l l M

/ B

&

P a n c a k e





& P a n c a k e


& P a n c a k e





&

P a n c a k e

L o a d C e l l M

/ B

&

P a n c a k e




& P a n c a k e


& P a n c a k e

NOTES

load cell m-b

Documents