Location of Primary Wind Girder

Design as per API650.

Here's a place where you can find API STD 650.

API 650 provides loacation of Secondary wind girder not primary wind girders. It is calculated based on transposed height. That is documented.Primary wind girder can ben located near the top shell course but do we have any range?

i want to alter the location of PWG because of change in fire hydrant position.

API 650 provides loacation of Secondary wind girder not primary wind girders. It is calculated based on transposed height. That is documented.Primary wind girder can ben located near the top shell course but do we have any range?

i want to alter the location of PWG because of change in fire hydrant position.

Slide 36 suggests approx 1m from the top.......

Read for yourself http://www.slideshare.net/ledzung/storage-tanks-basic-training-rev-2