About Double Drilled Flanges
For convenience operators using certain API flanges will request that those flanges have double drilled bolt circles. Double drilled flanges…
Flange Bolt Hole Orientation for Stack or System Assembly
When assembling equipment, operators sometimes find it necessary or advantageous to join flanged equipment of different nominal…
Double Studded Adapters and Spacer Flanges
Except for Crossover Connections, Double Studded Adapters (DSA’s) serve as the shortest method to join flanges of different…
Crossover Connections
Using combination ring gaskets and combination bolts Certain nominal size API Spec 6A flanges with different working…
Torque Values for 17D and 6BX Flange Bolts
The following table gives torque values for 17D and 6BX flange bolts with fluoropolymer coating for subsea…
Torque Values for API Spec 6A Integral Flanges
This post shows tables for the torque values for API Spec 6A integral flanges using fluoropolymer coated…
Field Non-Destructive Qualification Testing of Pressure Control Equipment
The following non-destructive inspection methods may aid operators in field evaluations of existing pressure control equipment. Visual…
Material Mechanical Property Requirements for API Spec 6A and 16A Bodies, Bonnets, and End and Outlet Connections
API Spec 6A and 16A specify four standard material property designations, identified by yield strengths. The following…
Test Pressure and Working Pressure Tests Explained
API Spec 6A and 16A require manufacturers to conduct hydrostatic body proof tests of individual units of pressure containing equipment. This…
Disassembly (Break-Out) of Made-Up Flanges
Before beginning any wellhead flange disassembly it pays to consider the following safety questions: Use diligence in…