101396 sensator

Copyright © 2001 - 2002 Acadiana Oilfield Instruments, Inc. All rights reserved.

AOI Instrumentation and the AOI logo are trademarks of Acadiana Oilfield Instruments, Inc. All other brand names and product names are trademarks or registered trademarks of their respective companies.

AOI Instrumentation 105 Bonin Road Lafayette, Louisiana 70508 USA

www.aoiinstrumentation.com

Printed in the U.S.A.

Part Number Edition Date

TM-512 Second November 2002

4 101396 Tension Sensator Load Cell Installation and Maintenance Manual

Contents

1 Introduction 7

2 Installing the Sensator in the Anchor 9

3 Maintaining the Sensator 13

Checking and correcting the sensator gap . . . . . . . . . . . . . . . . . . . . 13

Checking and correcting excessive air in the sensator . . . . . . . . . . . 16

Removing the sensator from the anchor . . . . . . . . . . . . . . . . . . . . . . 17

Cleaning the sensator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Cleaning the sensator’s exterior . . . . . . . . . . . . . . . . . . . . . . . . . 18

Cleaning the sensator’s interior . . . . . . . . . . . . . . . . . . . . . . . . . 19

Disassembling the sensator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Reassembling the sensator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

101396 Tension Sensator Load Cell Installation and Maintenance Manual 5

1 Introduction

This manual explains how to install and maintain AOI Instrumentation™ 101396 Tension Sensator Load Cells. This manual also includes instructions for removing, disassembling, and reinstalling 101396 Tension Sensator Load Cells.

Note

The 101396 Tension Sensator Load Cell may sometimes be referred to in any of the following ways:

- Sensator - Tension Load Cell - Tension Cell - 36.7 Tension Load Cell - 36.7 Square-inch Load Cell

For consistency, throughout this manual the 101396 Tension Sensator Load Cell is referred to as the sensator.

Sensators are used in deadline anchor systems to transmit load information to weight indicators, enabling operators to make sure optimum load capacities are not exceeded.

deadline anchor

101396 Sensator

weight indicator

load signals

not to scale


Chapter 1. Introduction

The following table lists the types of deadline anchor systems and weight indicators that use the 101396 sensator.

Table 1. Deadline anchor systems and weight indicators that use 101396 sensators

Anchor model

Weight indicatormodel

Rating(pounds per line) Hercules National

50 50,000 HA129T D

75 75,000 HA131T EB

100 100,000 HA131T EB


2 Installing the Sensator in the Anchor

Follow the instructions in this chapter to install the sensator in the anchor.

1. Apply grease to the cotter pins, anchor ears, and to the sensator eyes.

upper sensator eye

sensator pins

anchor ears

cotter pins

check valve

disconnect

lower sensator eye

Sensator


Chapter 2. Installing the Sensator in the Anchor

2. Mount the sensator, sensator pins, and cotter pins in the anchor with the sensator check valve and disconnect located at the top and the side toward the anchor drum.

3. Fill the system with fluid as follows:

a. Remove the cap from the check valve (see the illustration on page 9).

b. Screw the hand pump (part number 101349-102) onto the check valve body. (Do not tighten the swivel nut.)

c. Fill the hand pump reservoir with A-11 hydraulic fluid.

Note

Keep the hand pump reservoir at least half full at all times to avoid introducing air into the system.

d. Push the hand pump plunger slowly to expel air from the pump at the check valve. When air bubbles cease, tighten the hand pump swivel nut.

e. Push open the poppet in the sensator disconnect to allow excess air to escape.

f. Repeat the pumping and bleeding procedure until all the air is bled from the sensator.

swivel nut (connects to check valve)

reservoir

plunger

hand pump


Chapter 2. Installing the Sensator in the Anchor

g. Release the poppet and continue to pump fluid into the sensator until the sensator gap is approximately 0.62 inches.

h. Remove the hand pump and replace the check valve cap.

i. Recouple the disconnect. (Use only your hands to recouple the disconnect—do not use tools to tighten.)

Warning When you recouple the disconnect, make sure that the disconnect halves are properly aligned. Improper alignment can damage the o-ring and cause fluid leakage.

.62 inches (16 mm)


3 Maintaining the Sensator

This chapter explains how to perform periodic maintenance required to keep the sensator functioning correctly.

Checking and correcting the sensator gap

Check the sensator every day and before every heavy pull.

Follow these steps to make sure the sensator gap is approximately 0.62 inches (16 mm) and correct the gap if necessary:

1. Make sure the block (in the derrick) is empty.

2. Measure the gap.

If the gap is approximately 0.62 inches (16 mm):

The gap is correct.

If the gap is less than 0.50 inches (13 mm):

Proceed to step 3.

.62 inches (16 mm)


Chapter 3. Maintaining the Sensator


3. Inspect the sensator, the disconnect, the weight indicator hose, and the weight indicator for fluid leaks. Repair or replace components as necessary to eliminate leaks.

4. Readjust the cell gap as follows:

a. Remove the cap from the check valve.

b. Screw the hand pump (part number 101349-102) onto the check valve body. (Do not tighten the swivel nut.)

c. Fill the hand pump reservoir with A-11 hydraulic fluid.

check valve cap

disconnect

swivel nut (connects to check valve)

reservoir

plunger

hand pump




Note

Keep the hand pump reservoir at least half full at all times to avoid introducing air into the system.

d. Push the hand pump plunger slowly to expel air from the pump at the check valve. When air bubbles cease, tighten the hand pump swivel nut.

e. Push open the poppet in the sensator disconnect to allow excess air to escape.

f. Repeat the pumping and bleeding procedure until all the air is bled from the sensator.

g. Release the poppet and continue to pump fluid into the sensator until the sensator gap is approximately 0.62 inches.

h. Remove the hand pump and replace the check valve cap.

i. Recouple the disconnect. (Use only your hands to recouple the disconnect—do not use tools to tighten.)

Warning When you recouple the disconnect, make sure the disconnect halves are properly aligned. Improper alignment can damage the o-ring and cause fluid leakage.

.62 inches (16 mm)



Checking and correcting excessive air in the sensator

Checking and correcting excessive air in the sensator

Excessive air in the system can cause incorrect stroking. This section describes how to check for excessive air and how to eliminate it to assure the sensator stroke is correct.

1. Check the sensator stroke indication for a light load and a heavy load (for example, when the stroke is going into and out of the hole).

A difference greater than 0.08 inches (2 mm) between an empty load and a load of approximately half the weight indicator capacity means that excessive air is in the sensator.

2. If excessive air is in the system, eliminate it as follows:

If the weight indicator is not panel-mounted:

Loosen the plug (behind the damper block) on the weight indicator to bleed the air.

If the weight indicator is panel-mounted:

Bleed the air from one of the damper block connections.

3. Follow the procedure in “Checking and correcting the sensator gap” on page 13 to make sure the gap is still correct. Correct the gap if necessary.



Removing the sensator from the anchor

Removing the sensator from the anchor

This section explains how to remove the sensator from the anchor for cleaning or maintenance.

1. Make sure the block (in the derrick) is empty and that the sensator is fully loaded with hydraulic fluid.

2. Uncouple the disconnect.

3. Securely block the anchor on the bottom stop.

4. Remove the load from the sensator as follows:

a. Open the poppet in the sensator disconnect.

b. Drain fluid from the sensator until the load is relieved from the sensator and transferred to the anchor stop.

5. Remove the cotter pins, sensator pins, and sensator from the anchor, taking care not to damage the anchor or the sensator. (See the illustration on page 9.)

Note

If it is difficult to remove the pins from the anchor, use penetrants or other liquids to free them.

check valve cap

disconnect



Cleaning the sensator Cleaning the sensator’s exterior

Cleaning the sensator

This section explains how to clean the exterior and interior of the sensator.

Cleaning the sensator’s exterior

After you remove the sensator from the anchor (as described above), clean off any dirt, ice, or other material that have accumulated on the sensator. (If necessary, you can use a high-pressure water hose to clean the sensator.)

Clean off any rust or corrosion that has formed on the sensator pins or the anchor ears.

sensator pins

anchor ears



Cleaning the sensator’s interior Cleaning the sensator

Cleaning the sensator’s interior

After you disassemble the sensator (as described in “Disassembling the sensator” on page 20), use steel wool or a wire brush to clean all metal parts.

Check the hose (11 in the illustration below) for breaks or cuts and make sure the inside of the hose is clear.

Wash the diaphragm (9), retainer ring (7), and diaphragm sub-assembly casing (8) in detergent, rinse with clean water, and dry with air or a cloth.

Warning Do not use solvents or distillates to clean the diaphragm, retainer ring, and diaphragm sub-assembly casing. Do not sandblast the retainer ring or sub-assembly casing. Using solvents or sandblasting can cause the diaphragm to become unseated when the diaphragm is under pressure.

11

9

7

8



Disassembling the sensator Cleaning the sensator’s interior

Disassembling the sensator

Use the following illustration, parts list, and instructions in this section to disassemble the sensator.

Table 2. 101396 Sensator parts list

Item number

Part number Description

Quantity required

1 101336 Housing, upper 1

2 888257-312 Screw, 5/16–18 x 3/4, skt head 16

3 101337 Housing, lower 1

4 101306 Bolt, tie 16

5 109106 Plate, load 1

6 109111 Spacer 16

7 109119 Ring, retainer 1

1

2

1312

11

10

9

8

5

7

6

4

3

15 14

16



Cleaning the sensator’s interior Disassembling the sensator

* Not shown.

Follow these steps to disassemble the sensator:

1. Clamp the bottom half of the sensator pad eye in a vise.

8 109107 Casing 1

9 21-367 Diaphragm 1

10 301811 Elbow, 1/4M x 1/8F 1

11 101367 Hose, 12-inch with coupling, 3/16-inch ID

1

12 109026 Junction block 1

13 888257-889 Screw, 5/16–18 x 3/4, fil head 2

14 98-21P Check valve, with cap 1

15 98-900A-20 Disconnect, male half with dust cap 1

16 98-996 Nipple, 1/4 x 1-1/2 inch 1

17 98-900A-02 *Disconnect, female, hose half 1

Table 2. 101396 Sensator parts list (continued)

Item number

Part number Description

Quantity required

pad eye



Disassembling the sensator Cleaning the sensator’s interior

2. Remove the two junction block screws (13).

3. Pull up the junction block (12) and unscrew it from the hose by holding the hose coupling with a wrench and turning the junction block counter-clockwise.

4. Remove the bolts (4) from the upper housing (1). Lift the upper housing off the sensator.

5. Remove the bolts (4) from the lower housing (3).

6. Lift out the diaphragm sub-assembly (2, 7, 8, and 9) and the load plate (5).

7. Unscrew the hose (11) from the elbow (10).

8. Remove the screws (2) from the diaphragm sub-assembly (2, 7, 8, and 9). Separate the casing (8), diaphragm (9), and the retainer ring (7).

9. Clamp the junction block (12) in a vise and remove the check valve (14) and the disconnect (15).



Cleaning the sensator’s interior Reassembling the sensator

Reassembling the sensator

Refer to the following illustration and the table on page 20 to reassemble the sensator.

1. Clamp the junction block (12) in a vise. Apply thread sealer to the check valve (14) and to both ends of the ¼-inch nipple (16) pipe threads.

2. Thread the anchor half disconnect (15) to the nipple (16), then thread both components—along with the check valve (14)—to the junction block and tighten.

3. Place the diaphragm (9) in the groove in the diaphragm sub-assembly (8). Slip the retainer ring (7) over the diaphragm and align the holes in the retainer ring with the holes in the casing.

4. Apply locktight sealant to the cap screw threads and start (but do not completely tighten) all 16 screws (2).

1

2

1312

11

10

9

8

5

7

6

4

3

15 14

16

female male



Reassembling the sensator Cleaning the sensator’s interior

5. Tighten the cap screws a few turns at a time, alternating between opposing pairs of screws. Make at least 4 or 5 complete rounds of tightening before final complete tightening.

Note

When properly assembled, the casing and the retainer ring form a flush seal around the circumference.

6. Apply thread sealer to the threads on both ends of the hose (11). Tighten the hose into the elbow (10).

7. Clamp the lower housing (3) in a vise and place the load plate (5) on the housing. Center the scallops of the load plate on the housing bolt holes.

8. Place the diaphragm sub-assembly (2, 7, 8, and 9) over the load plate (5), with the threaded holes in the casing aligned with the bolt holes in the lower housing (3) and the elbow (10) is in the position shown in the illustration on page 23 and below.

9. Position the spacers (6) over the bolt holes in the lower housing (3). Loosely thread the lower housing bolts (4) into place.

10. Position the spacers (6) over the bolt holes in the load plate (5).

elbow



Cleaning the sensator’s interior Reassembling the sensator

11. Loop the hose (11) as shown by the dashed line in the top view and pull the end through the hole in the upper housing.

12. Loosely thread the junction block (12) on the hose end (11).

13. Position the upper housing (1) so that the bolt holes are centered over the spacers (6). Thread the upper housing bolts (4) into place. Tighten all the upper housing and lower housing bolts.

14. Tighten the hose (11) into the junction block (12) by holding the hose coupling with a wrench and rotating the junction block clockwise. Make sure that, when tight, the junction block is in the relative position shown in the illustration on page 20.

15. Apply Locktite sealant to the junction block screws (13). Insert the screws and tighten them.

Reassembly of the sensator is now complete. Prepare the sensator and anchor for operation as follows:

1. Replace the sensator, sensator pins, and cotter pins in the anchor.

2. Refill the system with hydraulic fluid and check the sensator gap as described in “Checking and correcting the sensator gap” on page 13.

hose


101396 sensator

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