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THREAD GAUGING TECHNIQUES
Connection Thread Styles Straight Threads
API Tubing Tubing and Casing Tapered Tapered Threads Threads
Connection Thread Styles Straight Threads
API Tubing Tubing and Casing Tapered Tapered Threads Threads
API Connection Names
EUE – EUE – External External Upset Tubing
STC – STC – Short Short Thread Casing
NUE – NUE – Non-Upset Non-Upset Tubing
LTC – LTC – Long Long Thread Casing
BTC – BTC – Buttress Buttress Casing
Datum
What are Tubing & Casing Threads
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” – 4½”
◦
Casing sizes: 4½” – 20”
There are two cone angles or tapers ◦
All 8-round threads are ¾” Taper Per Foot (TPF)
◦
Buttress sizes 4½”- 13⅜” are 1” TPF
◦
Buttress sizes 16”- 20” are 1” TPF
How Threads Lock Up and Seal
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
8R Thread Form
What is a “Datum Plane”?
Datum Plane- a starting point or reference location. Also referred to as the face or end of pipe. Datum Datum A
Datum B
How do we get started?
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
TDWIN TAPER Drawing 7” LTC Pin
Thread Lead Inspection with an LG-5002
Measuring the part The LG-5002 measures the same way on the part as on the standard.
Set using a Standard Double-check your zero setting Measure the part Compare the standard to the machined lead
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 for comparison.
Note: Lead setting standards designs are based on the taper of the connection.
Thread Height Inspection Set using a setting standard
Double check your zero setting
The TH-3002 is used the same way on the part as on the standard.
Measure the part
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.
Zero the dial on the first thread. Do not lock the bezel clamp!
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
Pin PD Inspection with the MRP-2001 (Crest Cone Diameter Inspection) While holding the gage against the part face, sweep left and right to find the largest indicator value. Then, rotate the gage 90° and repeat The MRP Shoe makes contact with the crest cone MRP-2001 is preset to size by the use of “A” & “B” Rod Standards The MIC TRAC can be used instead of the standards
“B”
Standard
“A” Standard
What do you do with the MRP readings? 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.
Ovality
Average Cone Diameter
How egg-shaped or out of round the pipe is
The diameter of the part would be, if it were round (Largest Diameter - Smalle st Diameter) = ACD 2
L A R G E R E A D IN G
Largest Diameter - Smallest Diameter = Ovality
S M A L L R E A D IN G
Largest Diameter
Smallest Diameter
Averaged Diameter
Largest Diameter
Smallest Diameter
Ovality
+.005
-.010
-.0025
+.005
-.010
.015
Largest Diameter
Smallest Diameter
Averaged Diameter
Largest Diameter
Smallest Diameter
Ovality
-.005
-.010
-.0075
-.005
-.010
.005
Largest Diameter
Smallest Diameter
Averaged Diameter
Largest Diameter
Smallest Diameter
Ovality
-.015
+.001
-.007
-.015
+.001
.016
Average Cone Diameter Average Cone Diameter is the distance across the face of the pipe or coupling. Determining the “round” diameter of a connector requires l ocating the largest and the smallest diameter readings on the part and taking the average of these two readings. Largest Diameter
Smallest Diameter
Averaged Diameter
Largest Diameter
Smallest Diameter
Averaged Diameter
+.005
-.010
-.0025
+.005
-.005
.000
L A R G E R E A D IN G
S M A L L R E A D IN G
Thread Ovality 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 sign attached). Largest Diameter
Smallest Diameter
Total Ovality
Largest Diameter
Smallest Diameter
Total Ovality
+.005
-.010
.015
+.005
-.005
.010
L A R G E R E A D IN G
S M A L L R E A D IN G
Thread Form Inspection TP-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.
Pin Length Inspection
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 a full radius top. L2 L4
L4=Last scratch length.
15 Minute Break
Datum A
Coupling Threads
Datum B
How do we get started?
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
TDWIN TAPER Drawing 7” LTC Coupling
Coupling Thread Lead Inspection with an LG-5002
Set to zero using a standard
Double check your zero setting
Measure the part
The LG-5002 measures the same way on the part as on the standard. 1. 2. 3.
Place the fixed ball contact in the first full depth thread. Move the fixed ball back one thread and check again. Record your measurement for comparison.
Remember: Each different taper requires a different lead setting standard
Coupling Thread Height Inspection with a TH-3006 Set to zero using a standard
Double check your zero setting
Measure the part
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.
Coupling Taper Inspection with an IT-6000
Zero the dial on the first thread. Do not lock the bezel clamp! To inspect, move the gage down the taper 1” or: Note the radial location of the gage 8 threads for 8-round to the part or chuck. 5 threads for Buttress (6 or 12 o’clock is best) After moving 1” down the taper, double check your radial position of the gage to the part or chuck.
Coupling PD Inspection with an MRP-2002 (Crest Cone Diameter Inspection) “B”
Standard
While MRP-2002 holdingisthe preset gagetoagainst size with the the use part of face, “A” & sweep “B” Rodleft Standards & right to find the largest indicator value The MIC TRAC can be used instead of rod standards. Rotate the gage 90° and repeat
“A”
Standard
MRP Reading Refresher 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 Ovality How egg-shaped or out of round the pipe is
Average Cone Diameter The diameter the pipe would be, if it were round
L A R G E RE ADING
S M A L L REA DING
(Largest Diameter - Smalle st Diameter) = ACD 2
Largest Diameter - Smallest Diameter = Ovality
Coupling Length Inspection Q
“Q” is measured from the coupling face to the start of the 35° chamfer.
Always keep the scale parallel to the coupling axis.
NL/2 Coupling Length (NL)
NL/2 = ½ the coupling length. NL = Length of coupling.
