how to justify that I can use API 5L gr B pipe since I do not have Api 5L x60 pipe 1

[brvs2014]

in a water reinjection project we use api pipe 5L Gr B, since the material is contemplated in the customer's Piping Class, however for this project a piping class was created in which the pipe is specified as Api 5L X60, the The customer does not want to accept the Api 5L Gr B pipe that was included in his piping class and he requires us to change the pipe, as I can show you that the API 5L Gr B pipe satisfies the same as the Api 5L gr x60, I thank you very much prompt help
regards

 

[DekDee]

brvs,
How do you plan to show they are similar ?
Gr B has a minimum yield strength of 35,000 psi and X60 is 60,000 psi
Gr B has a minimum tensile strength of 60,000 psi and X60 is 75,000 psi

Regards,
DD

 

[mk3223]

Pipe Specs are selected according to the process design pressure and temperature conditions. Are both Gr.B and x60 pipes all met the process conditions? if it's true, then the Client may need to record a strong reason for requiring the higher strength pipe.

 

[DGrayPPD]

Do the conditions for the new project match that of the previous project? If so, what is the client's reasoning for wanting the higher grade material?

"Tell me and I forget. Teach me and I remember. Involve me and I learn."

- Benjamin Franklin

 

[LittleInch]

If the wall thickness of the pipe is based on pressure compared to a minimum thickness for construction purposes, then the X60 pipe for the same OD will have a larger ID.

For long distance systems this can make a big difference to the pressure loss, especially if as a water injection the design pressure is quite high.

If the customer wants X 60, why are you not giving him X60?
You've provided no real information so we cannot see what the issues are.

bottom line - Grade B will be almost twice as thick as X60 if you're sizing on design pressure, twice as heavy, take longer to weld etc etc What's not to like about X60?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[brvs2014]

Under conditions of pressure and temperature the two materials fulfill satisfactorily, however the project has a great rush and the API 5L x60 takes too long to arrive, in all the previous projects we have worked with API 5L gr B and we have in stock this material , besides this contemplated in the Piping Class of the client, nevertheless a parallel Piping Class was created in the consortium and in that piping class is specified api 5L x60, the client when seeing this new Piping Class requests the new material.

 

[LittleInch]

So give the client the option. Wait for X60 or use Grade B.

You haven't said anything about the decrease in ID caused by thicker Grade B pipe?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[DGrayPPD]

All you can do is give the Client the option and the reasons why Gr. B would be satisfactory and explain the schedule issue for X60 and let them make the call.

Get it in writing and signed off on. Remember that old phrase, "the customer is always right... except when they are wrong."

"Tell me and I forget. Teach me and I remember. Involve me and I learn."

- Benjamin Franklin

 

[brvs2014]

thank you all for your answers, make a calculation memory with the admissible pressures of each material I hope that with this the client accepts the change

 

[GD2]

The bottom line is cost. For long distance pipeline projects, its normal to use high strength materials. For the same design pressure, you use thinner pipes with higher strengtb pipes. As Pipe /construction cost is based on weight, the savings will be in thousands of dollars for a pipeline project. Usually you won't use high strength piping for facilty or above ground piping. The reason being high srength pipe has higher stress built into it, which imposes greater risk to operators.

Ganga D. Deka, P. Eng
Canada

 

[LittleInch]

GD",

You were doing ok until that last sentence "The reason being high strength pipe has higher stress built into it, which imposes greater risk to operators" which is, IMHO, incorrect.

There are a few reasons why you don't tend to see X60 used on piping systems which include:
If you use B31.3 as your design code you only get about 10% more S value so spend more for not much reduction in WT
If you follow a pipeline code then you can use the thinner pipe but need to use higher strength fittings

However in neither case does it has "higher stress built into it" or that is poses any greater risk to operators.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[dik]

If it was originally spec'd and contracted as the lower strength pipe and the client wants to increase this then simply inform the client that there is a cost associated with this and present him with a preliminary cost estimate. Make the client happy...

New cost will include materials, re-design and delays...

Dik

 

[GD2]

LittleInch,
I was talking in the context of the inherent/built-in stress on X60 Grade pipe and NOT the stress due to internal pressure. It's the stress generated in manufacturing/metallurgy. Owners would have loved to use X60 pipes for facility/plant build-up as they would have saved thousands of dollars.
API pipes were developed primarily for pipelines that are underground. Plant/facility piping are above ground and therefore, poses a threat to workers around the plant. Given under same conditions, a X60 pipe will fail first before a Gr.B pipe, because X60 pipe has more inherent energy level built into it. That is the reason why B31.3 don't list API X60 pipe under listed materials in table A-1. It does only list API Gr. A25 and Gr. A which has much lower stress levels of 25 ksi and 30 ksi yield strengths respectively.

Ganga D. Deka, P. Eng
Canada

 

[LittleInch]

Ganga,

I don't know who told you this or where you read it, but if you have some back up information it would be good to see, because as far as I can see that's not correct.

Please tell me why a properly designed X 60 pipe will fail before a grade B pipe. "Inherent energy" doesn't make sense.

B 31.3 does list all the API grade pipe, but like I said, because it only gets you a 25% increase in the value of S (as it takes the lower value of 1/3 UTS and not SMYS) most people don't use it in a B 31.3 environment.

Page 193 of B 31.3

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[KevinNZ]

I agree with Littleinch. Piping designed to B31.3 should have the same safety factors for grade B and X grade pipes.

To the OP,
IF the two specifications have the same wall thickness and the same design pressure. Then there is little advantage (longer spans etc) using X60 and it costs more. If the X60 is thinner then there maybe savings.