pl don't distrub the existing thread, your query should have been posted in a seperate thread with an appropriate subject line.
This makes our life simple for archiving/retrival of the message data base.
Sent from my Nokia phone
-----Original Message-----
From: limesh M
Sent: 23/10/2010 9:41:06 am
Subject: Re: [MW:7726] Beginning to SA-450 meaning
Dear All,
Could you please explain the term 'over crowing' ?
Regards,
Limesh
On Fri, Oct 22, 2010 at 6:50 AM, Karthik <karthik6684@yahoo.com> wrote:
> Hi,
> Please refer UG 81 for tolerance for formed heads. Find the extraction
> below.
>
> *
>
> UG-81 TOLERANCE FOR FORMED HEADS
> **
>
> (a)
> *The inner surface of a torispherical, toriconical,
>
> hemispherical, or ellipsoidal head shall not deviate outside
>
> of the specified shape by more than 1
>
> 1⁄4% of *D *nor inside
>
> the specified shape by more than
> 5⁄8% of *D*, where *D *is the
>
> nominal inside diameter of the vessel shell at point of
>
> attachment. Such deviations shall be measured perpendicular
>
> to the specified shape and shall not be abrupt. The
>
> knuckle radius shall not be less than that specified.
>
> *
>
> (b)
> *Hemispherical heads or any spherical portion of a
>
> torispherical or ellipsoidal head designed for external pressure
>
> shall, in addition to satisfying (a) above, meet the
>
> tolerances specified for spheres in UG-80(b) using a value
>
> of 0.5 for
>
> *L/Do*.*
>
> (c)
> *Measurements for determining the deviations specified
>
> in (a) above shall be taken from the surface of the
>
> base metal and not from welds.
>
> *
>
> (d)
> *The skirts of heads shall be sufficiently true to round
>
> so that the difference between the maximum and minimum
>
> inside diameters shall not exceed 1% of the nominal
>
> diameter.
>
> *
>
> (e)
> *When the skirt of any unstayed formed head is
>
> machined to make a driving fit into or over a shell, the
>
> thickness shall not be reduced to less than 90% of that
>
> required for a blank head (see UW-13) or the thickness of
>
> the shell at the point of attachment. When so machined,
>
> the transition from the machined thickness to the original
>
> thickness of the head shall not be abrupt but shall be tapered
>
> for a distance of at least three times the difference between
> the thicknesses.
>
>
> Thanks & regards,
>
> (karthik)
> *Karthikeyan.S*
> *QA/QC Manager*
> *Getabec Energy Co.,Ltd.*
> *379,Moo6,Soi8,Nikhomphatana,*
> *Rayong-21180,*
> *Thailand.*
> *Phone: 0066 38 897035-8 (Off)*
> *Fax: 0066 38 897034*
> *Hand Phone: 0066 892512282*
>
>
> --- On *Thu, 10/21/10, vijay panchal <panchalvijay001@gmail.com>* wrote:
>
>
> From: vijay panchal <panchalvijay001@gmail.com>
> Subject: Re: [MW:7687] Beginning to SA-450 meaning
> To: materials-welding@googlegroups.com, limesh78@gmail.com
> Date: Thursday, October 21, 2010, 12:40 PM
>
>
> PLS can u tell me that how much overcrowing is permissible in 2:1
> ellispodial dishend and trospherical and in section vii Where to refer
> pls its urgent i need u r help
>
>
> thanks
> vijay
>
> On Tue, Oct 19, 2010 at 7:14 PM, limesh M <limesh78@gmail.com<http://us.mc1205.mail.yahoo.com/mc/compose?to=limesh78@gmail.com>
> > wrote:
>
> *Dear All,*
> **
> *I found that,Beginning to SA-450 on the front page of ASME BPV SEC II
> Part A 2010 Edition.What it means? *
> **
> **
> *Regards,*
> **
> *Limesh*
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