What do the digits in the tubing specification represent?

API tubing steel grades are identified by letters and numbers which dictate various characteristics of the steel. For each grade, the number designates the minimum yield strength. Thus L-80 grade steel has a minimum yield strength of 80,000 psi.

What is API pipe specification?

API Line Pipes API 5L is a specification of API which defines the standard for the dimension, physical, mechanical and chemical properties of the steel. Several pipe mills around the globe manufacture the API 5L pipes for Oil and Gas industry.

What is the difference between N80 and L80 tubing?

The N80 grade is normally less expensive than L80 grades. L80—A restricted yield-tubing grade that is available in Type 1, 9 Cr, or 13 Cr. Type 1 is less expensive than 9 Cr and 13 Cr but more subject to weight-loss corrosion. L80 is satisfactory for SSC resistance in all conditions but may incur weight-loss corrosion.

What can API 5B and 5CT be used for?

API 5B and 5CT are mainly used for casing and tubing. API 5B, Specification for Threading, Gauging and Thread Inspection of Casing, Tubing, and Line Pipe Threads.This Specification covers dimensions, tolerances and marking requirements for API threads and the gauges that control the acceptance criteria for the threads.

What is the API 5CT oil well casing specification?

API 5CT Casing and Tubing Specification API 5CT is standard technical specifications for steel casing and tubing pipes used for oil wells in petroleum and natural gas industries.

How many threads are in API 5CT tubing?

API Spec.5CT includes an illustration of API tubing joint connections. All three connections have tapered and round thread forms with either 8 or 10 threads/in., depending on the size. When casing is used as tubing, long-thread coupling/short-thread coupling and buttress-thread coupling connections can be specified.

How to update the API Specification 5CT, 10th edition?

Increase casing coupling OD wall thicknesses for 4-1/2, 5 and 5-1/2 inch, and update spec respectively throughout as result, e.g. recalculate weight gain/loss of material Increase casing coupling OD wall thicknesses for 4-1/2, 5 and 5-1/2 inch, and update TR respectively throughout as result