Re: [MW:28623] RE: 10320] PWHT of tank shell plates as per API 650

read next para, you will get the answer.

On Wed, 14 Nov 2018 at 14:23, <vikram413@gmail.com> wrote:

As per API clause 4.2.2 e) ASTM A516M Grades 380, 415, 450, 485/A516, Grades 55, 60, 65, and 70, for plates to a maximum thickness of
40 mm (1.5 in.) [thickened insert plates and flanges to a maximum thickness of 100 mm (4 in.)].

Maximum thickness is allowed upto 40mm for A516 Gr.70 material, how subcontractor can consider 45mm thickness for Crude tank.

Regards,

Vikram

On Monday, March 14, 2011 at 8:53:54 AM UTC+5:30, Kathalingam Babu wrote:

Hi

If i am not wrong the below clause is for the flush type cleanout fittings rather than the shell butt welded plates

Thanks & Regards,

K. Babu

----- Original Message -----

From: pgoswami

To: material...@googlegroups.com

Sent: Monday, March 14, 2011 10:23 AM

Subject: [MW:10323] RE: 10320] PWHT of tank shell plates as per API 650

Mr Malhotra,

Please refer the following clause of API 650 regarding PWHT, for Gr I,II,III,IIIA steel,Table 4-4a illustrates the grouping, which mostly applies to Carbon Steel.

If the steel used falls in any one of the above group and the weld exceeds 25 mm (1 inch) in thickness ,PWHT would be required as per clause 5.7.4., 5.7.4.3

Thanks.

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist & Consultant

Ontario,Canada.

Email-pgoswami@sympatico.ca,

pgos...@quickclic.net

5.7.4 Thermal Stress Relief: When the shell material is Group I, II, III, or IIIA, all opening connections NPS 12 or larger in nominal diameter in a shell plate or thickened insert plate more than 25 mm (1 in.) thick shall be prefabricated into the shell plate or thickened insert plate, and the prefabricated assembly shall be thermally stress-relieved within a temperature range of 600°C – 650°C (1100°F – 1200°F) for 1 hour per 25 mm (1 in.) of thickness prior to installation. The stress-relieving requirements need not include the flange-to-neck welds or other nozzle-neck and manhole-neck attachments, provided the following conditions are fulfilled:

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Manav Malhotra
Sent: Sunday, March 13, 2011 1:08 PM
To: material...@googlegroups.com
Subject: [MW:10320] PWHT of tank shell plates as per API 650

Dear Members,

We have crude and petroleum tanks in which shell plates thickness vary from 8 mm to 45 mm and the tanks are constructed by our contarctors. We just want to be sure whether PWHT has to be carried out or not. Our contrcator says as per API 650 there will be no PWHT of shell plates. I also refered API 650 but couldnt find any thing about pwht of shell plates. Cab any one help me out on this issues, in case pwht is to be carried out for shell plates, kindly provide the reference clause no from API 650.

Regards,

--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
Visit this group at https://groups.google.com/group/materials-welding.
For more options, visit https://groups.google.com/d/optout.

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change. Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...

Materails FAQs

Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...

The Schaeffler and Delong diagrams for predicting ferrite levels in austenitic stainless steel welds

Introduction Ferrite is important in avoiding hot cracking in during cooling from welding of austenitic stainless steels. 'Constitution diagrams' are used to predict ferrite levels from the composition by comparing the effects of austenite and ferrite stabilising elements. The Schaeffler and Delong diagrams are the original methods of predicting the phase balances in austenitic stainless steel welds. Nickel and chromium equivalents A 'nickel equivalent' is calculated for the austenite stabilising elements and a 'chromium equivalent' ferrite stabilising elements. These are used as the axes for the diagrams, which show the compositional equivalent areas where the phases austenite, ferrite, martensite (and mixtures of these) should be present. Although intended to show the phase balance of weld fillers, these diagrams can also be used to illustrate the phase balance of the 'parent' material. There are different diagrams for dif...

Materials & Welding

Search This Blog