Materials & Welding

  Hi  Mr.   Karthikeyan   Attached is the extract from PMI spec of one of the oil majors. ± 10% deviation is acceptable  .  PMI  whether it be XRF or Arcmet ( portable Spectroscopy) is highly machine dependent.   Minor  calibration issues may cause inconsistency of results.   I would advise get the samples tested by the alternative  suggested method.     API-578, is the basic document for PMI in oil and gas industries.See the extract from API -578  FYI.   15Mo3 is a C-0.5Mo (P3) steel,  while the composition shown below conforms more to P4   material  . Based on the results of the alternative test, decide on the acceptance/rejection of the elbows.   Thanks.   Pradip Goswami,P.Eng. Welding & Metallurgical Engineer/Specialist Ontario Power Generation Inc. Email-pgoswami@ sympatico.ca , pgoswami@quickclic.net     OIL Major's Spec:- ...

Dear Vijay   you are not given clear details about the location and type of repaire. generally the following steps to be follow--- first thing is to ensure the type and depthe of defect by ndt methods as per site conditions. if a repaire is crack drill at the both ends of crack to prevent further propgation of crack  during grinding. remove the defect by grinding only(gas cutting is not allowed). after grinding ensure compleat removal of crack/slag etc by applying ndt methods weld the cavity and apply final ndt (ut or rt)  apply highly penetrating oil to ensure there is no leakage. if necessary check the hardness value   i think this information may help you.   with regards ahmmad ali      On Sun, Jul 25, 2010 at 8:37 PM, Vijay < k.vijayaraj@gmail.com > wrote: Dear All, We are going to carry out Repair of Diesel Storage Tanks as per API 653 specification. Since am new to API 653, kindly guide me what are the things to be carried out for Repair. What are key ...

Accelerated cooling & Tempering  or normally known as quenched & tempered  are the same and this supply condition is opted to provide the strength to materials. In manufacturing shops , the most preferred method of forming is by cold forming ( point press ) or warm forming , keeping the temperature limited to only PWHT temperature ( 15 deg C lower than temperaing temperature). While purchasing plates , buyer to indicate the temepring temperature without which mills would do at lower values and manufacturer will have problem with PWHT temperature limittaions , Hardness control issues . In case Hot forming is done , the practical approach would be asking for test coupn taken from the formed component & ensuring the required mecahnical properties . This practice is very much is in vogue for quenched & tempered steels . getting the HT cycle and simulating itat manufacturer's premises is not easy . The final outcome should be the mechanical properties are not lost fo...

dear sir why we are not doing positive material identification in carbon steel materials please explain it -- 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.

dear sir why we are not doing pwht in ss materials please explain the reason -- 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.

In addition to what has been stated we also did hardness tests across base metal HAZ and weld metal. Ferrite tests are also good to have. -----Original Message----- From: materials-welding@googlegroups.com [mailto: materials-welding@googlegroups.com ] On Behalf Of Harish Kannepalli Sent: Thursday, July 29, 2010 9:52 AM To: materials-welding@googlegroups.com Subject: Re: [MW:6188] Test for PQR of Super Duplex Stainless steel plate UNS32750 dear yusuf, as per asme sec ix,2tensile,2facebend,2rootbend are mandatory.u may have macro also. On 7/29/10, yusufkhan pathan < yusufkhanp97@gmail.com > wrote: > Dear all, > > I have to prepare a PQR with GTAW+SMAW for Super duplex SS Plate of > UNS 32750 of thickness 8mm. > Please suggest me the type and references of test to be conducted for > the specimen as per ASME SecIX. > > Thanks in advance. > > Regards. > Yusufkhan > +91-9916008202 > > -- > To post to this group, send email to materials-weldi...

dear yusuf, as per asme sec ix,2tensile,2facebend,2rootbend are mandatory.u may have macro also. On 7/29/10, yusufkhan pathan < yusufkhanp97@gmail.com > wrote: > Dear all, > > I have to prepare a PQR with GTAW+SMAW for Super duplex SS Plate of > UNS 32750 of thickness 8mm. > Please suggest me the type and references of test to be conducted for > the specimen as per ASME SecIX. > > Thanks in advance. > > Regards. > Yusufkhan > +91-9916008202 > > -- > 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. > --...