nozzle orientation and vessel centerlines
nozzle orientation and vessel centerlines
(OP)
Greetings all,
When looking at a plan view (from the top) of a head with multiple nozzles and the flange bolt circles are to straddle
the normal vessel centerlines should the bolt circles straddle
the radial line or be oriented the same way a nozzle in the center of the head would be, straddling the 0 degree centerline. This question recently came up and a consensus hasn't been achieved and I can't find a definition anywhere.
Regards,
RLS
When looking at a plan view (from the top) of a head with multiple nozzles and the flange bolt circles are to straddle
the normal vessel centerlines should the bolt circles straddle
the radial line or be oriented the same way a nozzle in the center of the head would be, straddling the 0 degree centerline. This question recently came up and a consensus hasn't been achieved and I can't find a definition anywhere.
Regards,
RLS





RE: nozzle orientation and vessel centerlines
If we know for some reason that attached piping is all aligned with tank north-south or east-west centerlines, then we'll switch and align bolt patterns with those centerlines.
RE: nozzle orientation and vessel centerlines
Please, please, please orient the nozzle's bolt holes along the same lines a nozzle in the center of the head would be (usually straddling plant North/South). I couldn't imagine the mess (well, actually, I could) with trying to fit up piping from one vessel to another and the pipe flanges have to straddle a line 27° off plant North on one end and a line 43° off plant north at the other end. I've never seen a plant, and would hope to never work in one, which doesn't align all of its flanges which are in the horizontal plane along the same global lines. This is a very basic example of applying the KISS principle.
jt
RE: nozzle orientation and vessel centerlines
RE: nozzle orientation and vessel centerlines
Occasionally we will get a customer insisting on straddling radial centerlines. This creates confusion in the shop and field. The use of lap joint stub ends makes this a moot point though and is a shop preference whenever practical.
RE: nozzle orientation and vessel centerlines
Try this link....
SUNOCO (and others) have had to develop a sketch or standard to demonstrate exactly what they mean
http://ww
MJC
RE: nozzle orientation and vessel centerlines
RE: nozzle orientation and vessel centerlines
The reason probably stems from the fact that piping is made-up from iso's where its convenient to callout "bolt holes to straddle piping centerlines". Vessels on the other hand are made-up from plan and elevation drawings where its easier to callout any special bolt hole off-set. In any case you can't argue with a Piper when it comes to orientations.