API 5L X60 Cellulosic Root pass

Date 10-05-2007 17:52

Jose,
you're from Argentina, so you'll understand what I'll tell you.
Back in 1972, I was in charge of the construction of the Gaviotas natural gas compressing station located in the southeast corner of La Pampa province in Argentina. Our client was Gas del Estado, which no longer exists because it's been privatized.
Well, the client requested us to weld the API 5L X52 12,7 mm wall thickness (little difference with X60 15 mm) with E 6010 for the root pass and E 7018 for the subsequent ones.
So, the type of welding you're talking about has been known for the past 40 years. It's possible that the compressing is still there, working fine.
Giovanni S. Crisi
Sao Paulo - Brazil

By JCaprarulo (**)

Date 10-06-2007 06:13

Hello Giovanni, nice to heard about you again.
Sorry but no information about compressing plant, if it exist or is part of the memory.

By GRoberts (***)

Date 10-05-2007 19:28

According to ASME Section IX, API 5L Grade X60 has a minimum tensile strength of 75ksi, and the E7018 only has a minimum tensile strength of 70ksi. You should be using the next higher tensile strength consumables to match the strength of the base metal. You might consider E8018-C3. There are also higher tensile strength E7010 and E8010 available.

By G.S.Crisi (****)

Date 10-06-2007 00:15

You're right, G. Roberts, I agree interely.
Giovanni S. Crisi

By NDTIII

Date 10-06-2007 04:24

We have been using E-6010 for root passes on pipelines for years. E-6010 and E-7010 for X60 pipe. That is because E-7010 is a downhill rod and the pipeline welders can produce fast welds. We also use E-6010 on the root and E-7018 on Tie-In welds. We have never had a problem. It is used all over.

The E-6010 has good peneteration characterisitcs for root passes.

By JCaprarulo (**)

Date 10-06-2007 06:11

Gents,
Thanks for all answers, picture is more clear for me now.

By dbigkahunna (****)

Date 10-08-2007 03:51

You should be running E7010+ for the root on 5L X60. Most X60 will pull 62 to 65,000. E6010 ro E6010+ is only a 60,000 pound rod. If root gp at the starts on the bead or internal undercut is a problem, consider qualifying a straight polarity procedure. Keep the IPM on the bead below 10. Have the gap on the bead at 1/8 using a 5/32 rod. Running straight and 8-10 IPM you will get a nice flat bead. With 7018 on the hot pass you will have to do a lot of grinding so be careful on cracks. Be sure the pipe is set on skids before grinding and maintain a 200 degree (f) interpass between the bead and the hot pass.
BABART's

By JCaprarulo (**)

Date 10-08-2007 05:56

Thk. you, good operative information.

By downhandonly (***)

Date 10-08-2007 19:50

70+ from the bead to the cap should be no problem. like dbigkahunna says though watch the bead hands for speeding (hollow bead) and generally get a hot pass in there within 15 minutes of the bead and a hot fill within 30 minutes of the hot pass maintaining your preheat at 250f 121c(that's what I've been accustomed to but any preheat (200f )is better than none) have fun!