What is the welding code applied in the following applications (Steel Structures , pipelines, Pressure Vessels, power piping)?

Aws D11.1 FOR STEEL STRUCTURES

ASME B.31.4 FOR PIPELINES

ASME SECTION9 FOR PRESSURE VESSEL

ASME B.31.1

AWS D1.1 FOR STEEL STRUCTURE

API1104 FOR CROSS COUNTRY PIPELINE,ASME B31.3 FOR PROCESS PIPING

API510 FOR PRESSURE VESSELS

ASME B31.1 FOR POWER PIPING.

Steel Structure- AWS D1.1

Pipelines - API1104

Pressure Vessel - ASME IX

Power Piping - ASME B31.1

AWSD1.1,API1104,31.1

AWSD1.1, API1104, ASME IIX, B31.1

1. AWS D1.1 

2. API1104

3. API510

4. ASME B31.1

AWS D 1.1 is used entire the world.

AWS D1.1 for steel structure

ASME B.31.4 pipe line

ASME section9 for Pressure vessel

ASME B.31.1 for power piping

for structure you may go for AWS D1.1  or else ASME SEC IX is applicable for all...

AWS D1.1 for steel structure

ASME API for  pipe line

ASME section8 division1, subsection B for Pressure vessel

ASME B..1 for power piping

Note: ASME section9 is Qualification Standards related to welding and brazing

ASME B.31.4 FOR PIPELINES

ASME SECTION9 FOR PRESSURE VESSEL