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Hi, We have a Heat exchanger with Tubesheet SB171 and same tube. The TTS joint is mechanical. However client wants to seal weld the same. Iam worried about the thermal expansion failure due to seal weld. Is there any guidelines available regarding thermal expansion failure due to weld in TTS...

Hello all I came across the term painting for "Uninsulated portions of insulated piping ex flanges", in one of my client coating spec. I have seen lines with flanges insulated. Can some one throw some light, what will decide if the flanges need to be insulated or insulation terminated before...

Dear all, We are replacing HK40 tubes in fired heater with proprietary materials. For HK 40 we can refer to A608 for type of tests required. Can some body tell me code requirements both mandatory and recommended, regarding the type and quantum of mechanical tests required? Any reference...

Thank u R6155.

Hello all; I was reading the below link for thickness limitation w.r.t "t+6mm" maximum limitation as given in A5 of B31.3 table 323.1 (Prior to 2020 edition) https://www.eng-tips.com/viewthread.cfm?qid=495511 Now this requirement(t+6mm) is removed in 2020edition, it is being interpreted as 2T...

Hello all, I was just wondering if anyone can explain the following discrepancy API 5L X52 (not normalized) pipe classified as Category A in ASME B31.3 and if normalized falls under category B. Refer Figure 323.2.2A Note 3 & Table A-1 Same Pipe are generally classified as category B in ASME...

Hello there, We are doing a TTS WPS PQR for cladded Tube sheet(8mm SS with Carbon steel 122mm- Welding on cladded side partial groove in tubesheet 1.5 mm depth only) & SS tube(2.1mm thick) . The client specifies that "All TTS to be tested as per QW 193". so QW288, QW250 requirements kick in...

Greetings, We have a tank where a patch is required near 3 plate junction in bottom. I was planning for a 600mm diagonal square tilted at 45 degree so look like a rhombus. I have 2 queries regarding this 1. The edge of Square patch(rounded to 2" at corner) tilted at 45degree sits directly on...

Hello there, For a flanged valve say 4" #600 Flange RF, What is the nominal thickness value to be used for impact requirement curve . Material is A216 WCB(Casting) is there any table where i can find the nominal thickness of flanged valve for a given material? Does the minimum shell...

Thanks Dekdee. Much appreciated

Thanks for the reply. Iam looking for mechanical properties. As per the 1995 edition it was 1100 MPA and 20% elongation. But since it was deleted from 1999 edition onwards, i would like to know where this material has been included. I searched and found ISO 15510 but it has only chemical...

I recently saw a WQT qualified with unassigned to p43 and extend their range of qualification as unassigned to P1 to 15f, 34, 41 to 49., As per the table given in QW-423.1 , I understand than any unassigned to any p number qualifies for same p number only, and in this case limited to p43 only...

Hello there, The Material 1.4532 has been deleted from En 10088-2(It was there in 1995 edition). Can any one help me , which code it is included in? I need to verify the mechanical properties but all i find is only from google but not from any En Code. Thanks

Thanks @gtaw. I guess for the 3rd scenario, it would only qualify S275JR to A 36 only instead of Group1(Exact combination as per table 6.9(2020 ed.)

A Plate material with Dual certification i.e with A36 and S275JR is used to make 2 test coupons and welded to each other and tested and qualified as per AWS D1.1. Does this qualify for all 3 scenarios? Unlisted to unlisted(S275JR) Unlisted to Group1 Group 1 to Group 1? Any corroborative...

@Sjones. I came across 17360. In their safety data sheet epoxy content given as max. 10% where as % Zinc (Zinc + zn oxide) comes around 80%. so the first point is satisfied where as the 2nd point is not. I am still at loss about how to interpret this.?

thank u all for your valuable feedback @Sjones. Thanks for the insight. Didnt thought that way. @3Ddave Yes it was a snip from client specification.

Thanks all for the feedback. @3DDave., The midcoat given as follows. MIO pigmented with 50% laminar MIO by weight in dry film. So I guess, the first 2 points are talking about primer., hence it doesnt make sense to me. I have attached the snip for reference, if that would be of any...

I came across a client specification which reads like this 1. Zn rich primers shall be 2 pack epoxy media and must contain 80% metallic zinc by weight in dry film 2. Zn rich epoxy shall have 40% min. weight content of epoxy. How can both be possible at the same time? or Am i missing...

Thanks @ 3DDave and IRStuff.