Re: [MW:7703] Beginning to SA-450 meaning

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 11⁄4% 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> 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 -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents. -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.