How do I do welding's process about pipes of steam?

wow,

first, where is the location,

welding steam pipe may require certifications (ASME PP), and since you have to ask, I have to assume you have none or a WPS (Weld Proceedure Specifications).

And if you are starting from scratch based on your question and the information provided. check the yellow pages for certified welders.

I am saying this because Liability issues are nasty.

phoenix911

thank you for your answer , well first this is a search for a work about pipes of steam in a installation of sugar processing, i am a mechanical engineer from LIMA , PERU ...

the pipe is 30'' of diameter ,thickness 3/8 '' material steel A 36, the rule about welding process must be ASTM, please i hope your answer , thank you for everything

Phoenix is right on the money. Call a certified welder. Unless it's in some ungodly inaccessible location or your plant is miles and miles from town, that weld should only cost about $200. Cheap insurance. The last thing you need in your plant is a burst steam pipe. Cutting corners will only cost at least twice as much in the long run!

200 dollars might buy you the filler rod

30 cm = 12" diameter pipe.

1. What is the wall thickness of the pipe?

You might need a welding procedures to qualify your welders.

2. What is the operating pressure of the steam?

3. Is the project requires 100% X-ray of welds? you may need a welding procedure for this.

If it is super saturated steam, then it is a high pressure steam pipelines with special tensile strength pipe materials.

Regards,

Jojie_oak

Welding a steam pipe in operation is difficult. Even a Certified Welder cannot do the welding, if he is not given a proper qualified procedure.

You have mentioned that pipe material is of A36 with a normal C-Mn-Si composition. But this material falls under plate category. If it is so, then it could have been rolled and welded. May be it could be SA 106 Gr. B (seam less pipe) generally used for steam pipes. Please clarify.

You have not mentioned about the problem you are facing. May be a leak in the initial stage. A rupture in a small way? Then I assume the pressure is low. Then only you can attempt the repair patch work.

In pipe welding (for steam transmition) all the joints require X-ray quality welds irrespective of thickness and weld will not leak unless badly done and has defects.

If it is a small leak and as a temporary measure and you can jacket-up the area (same contour) with a fairly thick walled (10 /12 mm or so) pipe section (in two halves and covering minimum 15 to 20 cm i.e., 6 to 8 inches, on either side of the defect) and carry out Groove and fillet welds on either side using E 7018 electrode 3.2 mm size for root and second pass and 4.0 mm size for balance passes. The welding should not carried out continuously and please check up heat input during welding and also whether it can be done practically. If not never make an attempt.

The repair weld should be welded by Certified Welder and monitored properly by a Certified Welding inspector if required. A separate procedure may not be required if your earlier WPS and PQR is covered under P1 Gr. 1 and fillet welds can be done if a groove weld is approved.

As and when you have a shut down, the defective section can be replaced in a proper manner. Still I feel, it could be SA 106 Gr. B material and not SA 36. as SA 36 with a seam will not withstand high pressures.

C Sridhar. AIWT- Chennai -India

thank you for your answer , well first this is a search for a work about pipes of steam in a installation of sugar processing, i am a mechanical engineer from LIMA , PERU ...

the pipe is 30'' of diameter ,thickness 3/8 '' material steel A 36, the rule about welding process must be ASTM, please i hope your answer , thank you for everything

I have welded low pressure steam pipe using arc welding, "stick" with 6010 welding rods. 7018 is also used but the root pass is usually done with 6010 as 7018 is not very good when it comes to penetration. This is just my experience

You may want to contact Lincoln Electric, Cleveland, Ohio. http://www.lincolnelectric.com/knowledge/askus/default.asp?section=knowledge

They manufactu welders, rod, accessories, and have the knowlege of companies in your area that may be able to handle your problem.

I agree with all the prescribed notes of my friends.

In addition to that, I'd like you to know that A36 is a structural steel material (sheets, plates, and shapes), and can not be used in pipes handling steam.

A36 can be welded SMAW using electrodes E6013, where A106 is a steam pipes and can be welded SMAW by E6010, E7010, E7010G & E7018.

I AM CURRENTLY WELDING (SMAW) HIGH PRESSURE PIPE, AND MEDIUM PRESURE STEAM PIPE AND, I AM USING 5P+ FOR THE ROOT PASS, AND 3/32- E7018 FOR THE HOT, FILLER, CAP. MY HIGH PRESSURE PIPE IS, 6" AND 8", SCHEDULE 80, AND WHEN RUNNING WILL OFFSET 250LBS OF PRESSURE. OFCOURSE THE FAILING OF THESE WELDS IS HORIFIC, AND THE LIABILITY IS TREMENDOUS...SO I RECOMMEND THAT IF YOU ARE USING THE SMAW PROCESS DOING THIS...THE ROOT SHOULD BE PENETRATED 100%. THIS REQUIRES THE 6010 ROD TO BE FULLY INSERTED INTO THE BEVELS OF THE TWO PIPES-IF YOU ARE NEW TO THIS-IT MAY TAKE AWHILE TO GET THE HANG OF THIS-START BY PROJECTING THE ELECTRODE TO ONE SIDE OF THE beveled PIPE, AND DEVELOPE A PUDDLE, DRAGGING IT TO THE OTHER BEVELED PIPE-DRAG THE PUDDLE BACK TO THE OTHER SIDE-THIS SHOULD CREATE A "HORSESHOE" SHAPE. ONCE THIS ACCOMPLISHED, THE METHOD FOR RUNNING THE 6010 SHOULD BE A "DIG AND FILL" . WATCH FOR THE PUDDLE TO UNITE WITH "HORSESHOE" AND PUSH THE ROD UP AND BRING IT BACK DOWN "you can see the new metal cool-build on this...becareful not to apply to a hot start..the metal will fall out" INTO THE HORSESHOE, AND REPEAT UNTIL THE root IS FINIlSHED. GRIND all starts and stops. the root, balance passes,and cap-should add up to a total of 8(ATLEAST 8, SOME SAY 10, 12, 15..(YOUR HEAT WILL DETERMINE THIS, ALONG WITH THE SIZE OF THE PIPE. stringer passes for the fill and they should be staggered. the most important issue is that you keep your work clean from slag, and pirosity!!!! grind, and wire wheel all starts and stops!!!! high pressure pipe will cause mass destruction if not done correctly. the root is the upmost important pass,and the hot pass should literally push the root further into the pipe. I DO THIS EVERYDAY...and i am satisfied with THE outcome. I hope i could help...rolsten.stosh@yahoo.com Remember, 100% root, stringers,and cap. KEEP YOUR WORK CLEAN -STEAM WILL FIND ALL HOLES AND DIRT, AND WILL BLOW YOUR PIPE INTO THE AIR...GOOD LUCK...PIPE WELDERS UP!