How to use api ring gage to measure api tubing casing & line pipe couplings
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This document discusses how to use API ring gages to measure API tubing, casing, and line pipe couplings according to API specification 5B. It states that the ring gage should be flush to within a specified tolerance to the small end face of the pipe. Tables list size and thread combinations for non-upset tubing, external-upset tubing, casing, and line pipe along with their corresponding standoff tolerance. It notes the standoff information provided is nominal and the tolerance should be applied to the measured P1 value of the working ring against a certified master gage to determine the allowed minimum and maximum standoff.
How to use api ring gage to measure api tubing casing & line pipe couplings
- 1. How to Use API Ring Gage to Measure API Tubing, Casing & Line Pipe Couplings? FYOU PMEC , One Stop Shopping for Threading and Gauging Solutions. The premier leader in providing the highest quality of API Oil Country Gauges, including API Working Gauges, API Master Gauges. But How to USE API Plug Gauges to Measure API Tubing &API Casing & API Line Pipe Couplings? Any question and request about the API Gauges Please contact: edwin@szfyou.com API Specification 5B states that the required nominal standoff between the ring gage and the small end face of the pipe is 0, the ring gage should be flush to the small end face of the pipe. The tolerance on standoff is: 8TPI Tubing & Casing = ± 1P 10TPI Tubing = ± 1‐1/2P Line Pipe (All Pitches) = ± 1P The table below lists all of the size and pitch combinations and their corresponding standoff tolerance for each thread type Non‐Upset Tubing Size Designation D Threads per in. TPI ± Standoff Tolerance (Decimal) 1.050 10 0.1500 1.315 10 0.1500 1.660 10 0.1500 1.900 10 0.1500 2‐3/8 10 0.1500 2‐7/8 10 0.1500 3‐1/2 10 0.1500 4 8 0.1250 4‐1/2 8 0.1250 External‐Upset Tubing Size Designation D Threads per in. TPI ± Standoff Tolerance (Decimal) 1.050 10 0.1500 1.315 10 0.1500 1.660 10 0.1500 1.900 10 0.1500 2‐3/8 8 0.1250 2‐7/8 8 0.1250 3‐1/2 8 0.1250 4 8 0.1250 4‐1/2 8 0.1250
- 2. . Casing Size Designation D Threads per in. TPI ± Standoff Tolerance (Decimal) 4‐1/2 8 0.1250 5 8 0.1250 5‐1/2 8 0.1250 6‐5/8 8 0.1250 7 8 0.1250 7‐5/8 8 0.1250 8‐5/8 8 0.1250 9‐5/8 8 0.1250 10‐3/4 8 0.1250 11‐3/4 8 0.1250 13‐3/8 8 0.1250 16 8 0.1250 18‐5/8 8 0.1250 20 8 0.125 Line Pipe Size Designation D Threads per in. TPI ± Standoff Tolerance (Decimal) 1/8 27 0.0370 1/4 18 0.0556 3/8 18 0.0556 1/2 14 0.0714 3/4 14 0.0714 1 11.5 0.0870 1‐1/4 11.5 0.0870 1‐1/2 11.5 0.0870 2 11.5 0.0870 2‐1/2 8 0.1250 3 8 0.1250 3‐1/2 8 0.1250 4 8 0.1250 5 8 0.1250 6 8 0.1250 8 8 0.1250 10 8 0.1250 12 8 0.1250 14 8 0.1250 16 8 0.1250 18 8 0.1250 20 8 0.1250
- 3. Note: Standoff information provided is based on nominal condition and is for reference only. API 5B requires that standoff to the pipe is adjusted/compensated by using the P1 value of your working ring as measured against a certified reference master gage. The standoff tolerance is then applied to the P1 value to determine the minimum and maximum standoff allowed. When available, this P1 value should be used in order to properly adjust the gage standoff in order to maintain compliance to API 5B.