Tips of Thread Inspection: LINE PIPE, ROUND THREAD CASING AND TUBING, AND BUTTRESS THREAD CASING
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FYOU PMEC ,supply a complete line of Thread Gauges listed in the API Spec 5B ，API Spec 7-2, and API Spec 11B. Also we provide its measuring gauges. To find out more information on our products, please contact us by E-mail: sales@fyougauges.com. We will provide you the best possible solutions for you as quickly as we can.
Tips 1: Temperature
All instruments shall be exposed to the same temperature conditions as the product to be inspected, for a time sufficient to eliminate temperature difference.
Tips 2: Care of Instruments
The instruments described herein are precision instruments and should be handled in a careful and intelligent manner, commensurate with the maintenance of the high accuracy and precision required for inspection under this Specification. If any instrument is dropped or shocked, it shall not be used for inspection purposes until its accuracy has been re-established.
Tips 3 : Cleaning the Threads
All threads shall be cleaned thoroughly before inspection.
Tips 4: Location of the First and Last Perfect Threads
a. The first perfect thread location is the thread nearest the chamfer on the pin or face of the coupling with a root having a full crest on both sides.
b. The last perfect thread location on external threads shall be L4 -g for tubing and line pipe, L7 for buttress, and last scratch (last thread groove) -0.500 in. (-12,7 mm) for casing round threads. For casing, the distance from the end of the pipe to the last perfect thread is called the thread element control length or TECL. The last perfect thread location on internal threads is J + 1p measured from the physical center of the coupling or from the small end of the box for integral joint tubing.
Tips 5: Measuring Intervals
a. Thread Height. For the gauging of external or internal threads, measurements shall be made at the first and last perfect threads where full crested threads exist and continued from either in 1 in. (25,4 mm) intervals for products having a distance between the first and last perfect threads of more than 1 in. (25,4 mm); 1/2 in. (12,7 mm) intervals for products having a distance between the first and last perfect threads of 1 in. (25,4 mm) to 1/2 in. (12,7 mm), and intervals consisting of 4 threads for products having 111/2 threads per in. (111/2 threads per 25,4 mm).
b. Lead/Taper
1. Common Intervals. For the gauging of external or internal threads, lead and taper measurements shall be made starting at the first or last perfect thread and continued from either in 1 in. (25,4 mm) intervals for products having a distance between the first and last perfect threads of more than 1 in. (25,4 mm), 1/2 in. (12,7 mm) intervals for products having a distance between the first and last perfect threads of 1/2 in to 1 in. (12,7 mm to 25,4 mm), and intervals consisting of 4 threads for products hav- ing 111/2 threads per in. (111/2 threads per 25,4 mm). Measurement of full perfect thread length may require an overlap of the thread measuring interval. At no time shall taper, height or lead measurements be taken with a contact point beyond the last perfect thread location except on buttress threads. 8uttress thread taper shall also be checked in the imperfect thread area.
2. Cumulative Lead Interval. The gauging of cumulative lead on external or internal threads shall be measured over an inter- val (between the first and last perfect threads) which has a length equal to the largest multiple of 1/2 in. (12,7 mm) for an even number of threads per in. or 1 in. (25,4 mm) for an odd number of threads per 1 in. (25,4 mm).
How to order from FYOU PMEC?
Just to mail the thread types need to be measured to sales@fyougauges.com or WhasApp/ Wechat: +86 139 6216 8423
