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welding procedure specification for API 5L Gr B pipes

Can anyone please suggest WPS for welding of pipe (a) API 5L Gr B to API 5L Gr B (b) API5L Gr 60 to API 5L Gr 60)pipe thickness 16mm by combination of TIG and SMAW processes. (or wps for P1 Gr1 to P1 Gr1 thk up to 20mm. I checked at many resources and I am considering electrode for TIG ER 702-3 for root run and for fill and cap E-7018-1 by SMAW process. preheating 10 to 200 degC, no PWHT, groove angle 60 deg. position 5G, vertical up,

  1. How to ensure cleaniness of gas pipeline before intelligent pigging

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    rathore_mbm2002
    , 10-02-2013 at 10:28 AM (welding procedure specification for API 5L Gr B pipes)
    Anyone experienced person in pigging, can tell us how to ensure cleaniness of natural gas pipeline before launching intelligent pig into pipeline so as to acquire better data results.
    I mean to say any quantitative limit of muck like .....kg/km/inch dia of muck may be allowed pipelne in final run of cleaning pigging and then ILI run can be done.
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  2. allowable limit of iron oxide/iron sulphide, sulphate in muck of pipeline received

    by
    rathore_mbm2002
    , 10-02-2013 at 10:23 AM (welding procedure specification for API 5L Gr B pipes)
    Any technical reference or guideline for limits of iron oxide/iron sulphate/iron sulphide per km run of pipe per Inch dia. Any quantitative limits?
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