Re: [MW:25352] LTCS PQR

Dear Ahmad ,

The main difference between LTCS and Carbon manganese steel is the percentage of manganese , silicon and nickel which is pretty high in LTCS. LTCS weldability is similar to CS except it may require preheat , PWHT , hardness check as it mostly operates at low temp .  You can use low hydrogen electrode ( E7018 ) and ER70S6 . Check for heat treatment and impact toughness requirements  as per your project specification and do the necessary with your PQR .

Thanks
TDK Yokesh

On 8 Sep 2016 11:50, "Mustaq Ahmad" <mustaqnk@gmail.com> wrote:

Dear Experts 

I am new for this job please help me 

for PQR of LTCS

1) required thickness min is 6.35mm &  dia is 12 inch

2) design press = 20kg/cm2

    design temp  = -45.6/37.8 degreee celcius

     op press      = 20 max

     op temp       = -40 degree celcius

3)  material is pipe - A 333 GR 6(P1 &G1) and flange - A350 GR LF2 RF

4) service is LPG plant- Relief and blow down

now please suggest me 

 a) what is is the size of the test coupon can be selected(dia with schd) where can i find the exact length of weld required to carry out mechanical testing for this PQR?

 b) is it possible to carry out the PQR for pipe to flange joint 

 c) what consumable can be selected for this if GTAW & SMAW ?

 

Regards

AHMAD

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