Thief Hatch Installation
Thief Hatch Installation
(OP)
Sorry for asking this silly question, but can somebody please tell me where I can find flange dimensional data for an API flange that has a bolt pattern API (16) 11/16 holes on a 10-3/8" circle? I tried looking at API 6A but I get the funny feeling I'm looking at the wrong place.
Thank you for your help.
Thank you for your help.





RE: Thief Hatch Installation
Check out ASME B16.5. Flange dimensions start on page 64. You'll find all the information you can possibly need there.
Hope this helps.
RE: Thief Hatch Installation
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But - I don't see any flanges with 16 holes on a 10 3/8" circle - that would be one every 2" !!!
RE: Thief Hatch Installation
Is this on a relatively small tank, and are you sure you have 11/16" holes and not 9/16"? Besides that discrepancy, your dimensions on bolt circle and number of bolts are in agreement with the Thief Hatch as called out in API 12F Figure 1 and API 12D Figure 3.
The references to B16.5 are for materials. Flange dimensions can vary, as most tanks don't need flanges capable of 285 psi pressure ratings.
jt
RE: Thief Hatch Installation
I'm looking for a flange that would mate up to an Enardo Thief Hatch model 330. I'm looking at their datasheet and it specifies a bolt pattern of 10-3/8" Circle API. I've tried searching for other brand name thief hatch sizes but it appears that this bolt pattern is pretty standard.
I've tried to match this bolt pattern size with B16.5 flanges but could not find a match.
Have you guys installed one of these thief hatches before and how did you do it?
Thank you.
RE: Thief Hatch Installation
RE: Thief Hatch Installation