tubing casing thread training

5/21/2018 Tubing Casing Thread Training

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THREAD GAUGING TECHNIQUES

PI Tubing and Casing

Threads


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Connection Thread Styles

Straight Threads

API Tubing and Casing Tapered Threads



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EUEExternal Upset Tubing

NUENon-Upset Tubing

BTCButtress Casing

API Connection Names


STCShort Thread Casing

LTCLong Thread Casing

Datum


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Purpose: Join two pieces of pipe together to produce a gas tight seal

API Specification 5B covers all Tubing and Casing dimensions

There are two types of pipe sizes

Tubing sizes: 1 4

Casing sizes: 4 20

There are two cone angles or tapers

All 8-round threads are Taper Per Foot (TPF)

Buttress sizes 4- 13 are 1 TPF

Buttress sizes 16- 20 are 1 TPF


What are Tubing & Casing Threads


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There are no lock washers or jam nuts on tapered threads to lock them together

The pin and box tapered threads interfere and allow them to form a seal when

torqued together as the flanks of the threads compress against each other.

However, a clearance remains between the crests and roots of the threads,

resulting in a helical leak path

Thread compounds or pipe dope plug up this helical path to produce a seal

under high pressures


How Threads Lock Up and Seal


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8R Thread Form


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DatumDatum A Datum B

Datum


What is a Datum Plane?

Datum Plane- a starting point or reference location. Also referred to asthe face or end of pipe.


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Request the product thread drawing

Verify the thread form is correct

Verify the threading insert is correct for the thread on the drawing

Request a gage set up report

List all the gage serial numbers used to inspect the part

Verify the ball contact sizes are correct

Set the gages to a zero on a calibrated standard

Thread the part and start the inspection


How do we get started?


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TDWIN TAPER Drawing 7 LTC Pin


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Set using a Standard

Double-check your zero setting

Measure the part

Compare the standard to the machined lead

Thread Lead Inspection with an LG-5002


Note: Lead setting standards designs are based on the taper of the connection.

Measuring the part

The LG-5002 measures the same way on the

part as on the standard.

1. Place the fixed ball contact in the first full

depth thread.

2. Move the fixed ball back one thread andcheck again.

3. Record your measurement for comparison.


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Thread Height Inspection

Set using a setting standard


8 Round thread height = .072125

10 Round thread height = .05560

Buttress TPF thread height = .0620

Buttress 1TPF thread height = .0620

The TH-3002 is used the same

way on the part as on thestandard.

1. Measure only within the

perfect thread length. Perfect

thread length is labeled L2

on the product drawing.

2. Align the gage base parallel

to the thread axis and tilt the

base back and forth to obtain

the lowest reading.

3. Record your measurement.

Double check your zero setting

Measure the part


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Zero the dial on the first thread.

Do not lock the bezel clamp!

Pin Taper Inspection with an ET-7000

To inspect, move the gage up the taper 1

(8-round = 8 threads, Buttress = 5 threads)

After moving back 1 up the taper, double-check

your radial position of the gage to the part or chuck


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MRP-2001 is preset to size by the useof A & B Rod Standards

The MIC TRAC can be used instead of

the standards

Pin PD Inspection with the MRP-2001

(Crest Cone Diameter Inspection)

B

Standard

A Standard

The MRP Shoe makes contact with the

crest cone

While holding the gage against the

part face, sweep left and right to findthe largest indicator value. Then,

rotate the gage 90and repeat


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LARGEREADING

SMALL

READING

Largest and smallest indicator readings provide data for calculating Average Cone

Diameter (ACD) and Thread Ovality. They both use the same data but calculate

the readings in different ways.

(Largest Diameter - Smallest Diameter) = ACD

2

Largest Diameter - Smallest Diameter = Ovality

Largest

Diameter

Smallest

DiameterOvality

+.005

-.010

.015

Largest

Diameter

Smallest

Diameter

Averaged

Diameter

+.005

-.010

-.0025

LargestDiameter

SmallestDiameter

Ovality

-.005

-.010

.005

Largest

Diameter

Smallest

DiameterOvality

-.015

+.001

.016

LargestDiameter

SmallestDiameter

AveragedDiameter

-.005

-.010

-.0075

Largest

Diameter

Smallest

Diameter

Averaged

Diameter

-.015

+.001

-.007

OvalityHow egg-shaped or out of round

the pipe is

What do you do with the MRP readings?

Average Cone DiameterThe diameter of the part would be,

if it were round



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LARGEREADING

SMALL

READING

Largest

Diameter

Smallest

Diameter

Averaged

Diameter

+.005

-.010

-.0025

Largest

Diameter

Smallest

Diameter

Averaged

Diameter

+.005

-.005

.000

Average Cone Diameter is the distance across the face of the pipe or coupling.

Determining the round diameter of a connector requires locating the largest and the smallest

diameter readings on the part and taking the average of these two readings.


Average Cone Diameter


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LARGEREADING

SMALL

READING

Largest

Diameter

Smallest

Diameter

Total

Ovality

+.005

-.010

.015

Largest

Diameter

Smallest

Diameter

Total

Ovality

+.005

-.005

.010

Thread Ovality is the amount of out-of-roundness in a piece of pipe or a coupling.

Determining ovality requires locating the largest and the smallest diameter readings

on the part and adding the smallest reading to the largest reading. The ovality is the

difference between these values. Ovality readings are always positive (no signattached).


Thread Ovality


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Thread Form InspectionTP-8R Profile inspecting pin and coupling thread. Always check the first starting thread.

Remember: When deburring the thread with a flapper wheel, burrs can be rolled into the thread groove.

When the connections are made up on the rig, burrs will cause galling.


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Pin Length Inspection

L2

L4

Always keep the scale

parallel to the pipe axis.

(Note: A digital depth gage can be used in

place of a scale.)

L2=Perfect thread length.

Crest of thread must have afull radius top.

L4=Last scratch length.


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15 Minute

BreakAPI Tubing and Casing Tapered Threads


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Coupling Threads


Datum A Datum B


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Request the product thread drawing

Verify the thread form is correct

Verify the threading insert is correct for the thread on the drawing

Request a gage set up report

List all the gage serial numbers used to inspect the part

Verify the ball contact sizes are correct

Set the gages to a zero on a calibrated standard

Thread the part and start the inspection

How do we get started?


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TDWIN TAPER Drawing 7 LTC Coupling


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Coupling Thread Lead Inspection with an LG-5002


Remember: Each different taper requires a different lead setting standard

Set to zero using a standard

Measure the part

Double check your zero settingThe LG-5002 measures the same way on thepart as on the standard.

1. Place the fixed ball contact in the first full

depth thread.

2. Move the fixed ball back one thread and

check again.

3. Record your measurement forcomparison.


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Coupling Thread Height Inspection with a TH-3006


Thread Heights: 8-Round = .0721

Buttress = .0620

Set to zero using a standard

The TH-3006 is used the same way on the part as on the

standard.

1. Align the gage parallel to the thread axis.

2. Lift up and down to obtain the lowest reading.

3. Record your measurement.

Double check your zero setting

Measure the part


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Coupling Taper Inspection with an IT-6000


Zero the dial on the first thread.Do not lock the bezel clamp!

Note the radial location of the gage

to the part or chuck.

(6 or 12 oclock is best)

To inspect, move the gage down

the taper 1 or:

8 threads for 8-round

5 threads for Buttress

After moving 1 down the taper,

double check your radial position of

the gage to the part or chuck.


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MRP-2002 is preset to size with the

use of A & B Rod Standards

The MIC TRAC can be used instead

of rod standards.

Coupling PD Inspection with an MRP-2002

(Crest Cone Diameter Inspection)


B

Standard

A

Standard

While holding the gage against

the part face, sweep left & right

to find the largest indicator value

Rotate the gage 90and repeat


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The Average Cone Diameter and Thread Ovality are calculated the

same for the coupling as for the pin

Refer to the previous slides for more detail

LARGEREADING

SMALL

READING

(Largest Diameter - Smallest Diameter) = ACD

2Largest Diameter - Smallest Diameter = Ovality

OvalityHow egg-shaped or out of round

the pipe is

MRP Reading Refresher

Average Cone DiameterThe diameter the pipe would be,

if it were round



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Coupling Length Inspection


Coupling Length

(NL)

NL/2

Q

Q is measured from the

coupling face to the start of

the 35chamfer.

Always keep the scale

parallel to the coupling

axis.

NL/2 = the couplinglength.

NL = Length of coupling.


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