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API 5L steel grades
3

API 5L steel grades

API 5L steel grades

(OP)
Two questions:

1)Any information about API 5L X60-X80 steel grades

2)Is there a difference in producing
  sour and non-sour API 5l grades respectively?
  What have I to consider?

Both questions especially concerning to the hot rolling process (concerning to soaking
temperature, rolling process, finishing temperature,
coiling temperature,...)?

I'd appreciate any further information available!

Thanks a lot for your help,
best regards,

WoKu

RE: API 5L steel grades

3
The technical specifications outlined below are stringent
so kindly consider them as a reference only.



1.  I would be reluctant to utilize X60-X80 CS pipes
    for sour service.  Mainly due to their weldability
    problems and high tensile strenght values which
    makes them prone to SSC.  If compelled to
    consider thickness reduction in view of PWHT
    or value engineering requirements especially for
    Hp Gas pipelines; increasing the diameter is a
    win-win situation.

2.  Chemical Composition, NACE-MR0175 & NACE-TM0284
    a)
    Restricting, C, S, P, Ca & Ni contents,
    limiting the CE to 0.38, Ca/S ratio
    to 1.5 of S > 0.0015 and Al:N ratio to
    be >= to 2:1
    
    b)
    SAW (Spiral) & ERW
    I be reluctant to utilize either type of pipes
    unless several supplementary requirements are
    in place.  As an example:
     
       -> Only high frequency for ERW pipes (400+)
          and perhaps only Induction Welding
       -> Double Hydrostatic testing to examine
          pressure reversal phenomena.
       -> Diameter reduction test upto 50% at
          various orientations without any visible
          indications.
       -> Pre-Qualify the manufacturers and their
          suppliers (mills)
      
    c)
    Mechanical Testing

       -> Impact Testing (Charpy)
       -> Hardness Readings inclusive of (Base, HAZ,
          Weldment) perhaps 15 readings across the
          wall thickness maximum Hv10 around 180 BHN.
       -> Limiting the maximum tensile & yield strenght
       -> Stipulating yield to be 85% of the uts.


3.  Acceptance criterion for NACE0284
    Solution: A

    CLR:5% average of 3 sections
    CTR:3%
    CSR:1.5%
   
    LCT: 0.1mm
    TCT: 0.1mm
 

General:

At least one specimens for each testing method shall be taken from the center of a the pipe or plate.        

4.  Several other requirements for fittings & flanges (butt
    welded, forged)

5.  All plates to be supplied normalized and normalizing
    is required after Cold Forming, welding, locally
    heating fittings.

Cheers

RE: API 5L steel grades

Hi! PVRV.
Can you help me?
it's about pipe API-5L GR.B, if it is possible to be used, in application with high temperature evacuation of liquid hydrocarbon from a stabiliser (liquid at T°= 260 °C).
- When the pipe is at atmospheric temperature (Tmax.= 40 °C ;and Tmin.= 5 °C), so my question is if we can evacuate the hot liquid into this pipe with no risk of rupture (caused by big temperature difference).

- Please, give me some ideas to began my study with this grade of metal ; and What are the conditions we have to consider.

Thank you for your quik reply.

RE: API 5L steel grades



1.  High Temperature Service

    1.1  API 5L Gr. B, may be utilized with proper
         design considerations.  Mainly, downgrading
         allowable stress.  Take a look at ASME Sec. II
         Pt. 4 tabulations pretaining to allowable stress
         versus temperature for various ferrous materials.

    1.2  ANSI B31.3 illustrates the use of governing stress
         equation and degradation factor for temperature.

    1.3  Take a look at the following CS piping materials
         suitable for high temperature service:

         A106, A234, A216, A194, etc


2.   Thermal Cyclic Stresses/Thermal fatigue/Thermal Shock

     Please elborate:

     2.1   Operating Pressure
     2.2   WeldHead Rating
     2.3   Depth/Water Column
     2.4   Low/High Bubble Point
     2.5   Tubing / Casing production
     2.6   etc etc etc
     
     At any rate take a look at API 5CT.

Cheers



 

 

RE: API 5L steel grades

Verry helpful reply.
I'll consider all your recommandations. and, I have to rectify for Max. temperature of liquid: 330°C (not 260°C).

RE: API 5L steel grades

At 330 C, it would be prudent to consider alloy material.
Let me know if need some examples.

RE: API 5L steel grades

Hi! PvRV
For CS piping indicated in point 1.3 (your reply); I've foud that A106-B grade is recommanded in API RP 14E when the range of temperture is (30°F to 650°F).
API 5L-B is indicated also but preference is for A106-B, with hogh temperature.

1- Is there big deference between the two grades on economic consideration ?
2- For thermal schok (point 2 in your reply), I've foud in a metallurgical document, that rupture of ordinary CS  caused by thermal stress is possible essentially when temperature is greater than 400 °C. So with 330°C; I considere no probleme with a rapide heating of the pipe. What is your opinion ?



RE: API 5L steel grades

1.  API 5L Gr. B & A106 Gr. B; from a economic prespective
    there isnt much of a difference.  

2.  Its not a bad idea to consider insulating the  
    pipeline, avoiding high schedule pipes and
    restricting the carbon content.

Cheers
  

RE: API 5L steel grades

Hello PVRV

I would be very please if you can give some information about pressure reversal, specially for ERW pipe.

Is the any  literature about it?
How  confidence can I get with two pressure hydrostatic test?

thanks

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