Had a flange weld fail on a boiler at the old Miller plant in Akron

It was a 3 inch steam line, pressure was only at 150 psi. The root pass looked good but the cap cracked after a week. Now I always pre-heat past 250 degrees on any flange over 2 inches, no matter what the spec sheet says. Anyone else run into this with older carbon steel?

2 comments

2 Comments

holly8988d ago

Actually, pre-heat temp depends more on material thickness than the flange size. That 250 might still be too low for thicker sections.

fiona_walker148d ago

We ran it at 300 for the heavy stuff.