FORMED TYPE TEE BRANCH IS ACCEPTABLE?

[CREERAAM]

Hai,

I have problem by customer for the following TEE fittings, The following sizes DIA 1200 (SCH XS) x DIA 200 mm (SCH 40), DIA 1200 mm (SCH XS) x DIA 250 (SCH 40)& DIA 1200 mm (SCH XS) x DIA 300 mm (SCH STD). Material standard are ASTM A 234 WPB, now am come to the conflict between my side to customer side. They are saying the non standard TEE fittings Branch must be with weldolet type BRANCH. But we have received from my supplier formed neck type branch for the above sizes. Formed type branch is not acceptable? ASTM A 234 WPB saying forming also allowed.


Please explain in this matter is it acceptable by ASME B 31.1 standard. In site they following the ASE B 31.1.

This fittings are going to work in the CHILLED WATER PIPE LINE (DISTRICT COOLING LINE).


NOTE : AVAILABLE TEE PHOTO ATTACHED

REGARDS,

G.SRIRAM.

Dream,Dream,Dream Dream transforms in to thoughts.And thoughts result in action

 

[LittleInch]

You (or your supplier) need to show that under ASME B 31.1 section 104.3.1 section G dealing with extruded outlets that your tee complies with it. If you do that then it complies, but you also need to check any piping specification that the client supplied which determines what tee connections are acceptable.

But it looks Ok to me.

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

 

[CREERAAM]

Mr.LittleInch

Thanks for the detail. My client spec saying according to my understanding they wanted all NON standard TEE with weldolet branch type. DIA 1600 x DIA 500 mm WELDED TYPE)with reinforcement) supplied for them. I have to wait for some time what they are going to say?

Regards,

G.SRIRAM.

REGARDS,

G.SRIRAM.

Dream,Dream,Dream Dream transforms in to thoughts.And thoughts result in action

 

[CREERAAM]

Mr.LittleInch,

My Tee's coming under reinforced extruded outlets means any externally welded any Reinforcment pad should be there? And the Size of the run to branch there is no restriction right? for example DIA 1600 mm X DIA 600 mm TEE can also be reinforced extruded outlet?

Can you pls explain below point?

(G.2) Definition. An extruded outlet header is
defined as a header in which the extruded lip at the
outlet has an altitude above the surface of the run that
is equal to or greater than the radius of curvature of the
external contoured portion of the outlet; i.e., ho ≥ ro. See
nomenclature and Fig. 104.3.1(G).

REGARDS,

G.SRIRAM.

Dream,Dream,Dream Dream transforms in to thoughts.And thoughts result in action

 

[LittleInch]

If your calcs indicate that you need re-inforcement then yes you will need to add some re-inforcement, but if not then you don't.

There is no restriction on size, but in practice much more than 60-70% branch to header size is difficult to manufacture.

Do you have a copy of B 31.1??

What it means is that as per the picture below, the lip of the branch is higher than the radius of the outer bend.

Looking at your picture, it doesn't comply with this requirement as far as I can see,,i.e. the radius is bigger than the height h.

If doesn't look like a well produced extruded tee to me.

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

 

[KevinNZ]

The type of tee installed must match (or be better than) the SIF used in the piping stress analysis. For example you can not change from a weldolet to the a reinforcing pad tee, the SIF is quite different. Changes must be checked in the stress analysis.

The designer may have added extra reinforcing to lower bending stress even if this is not required for pressure.

 

[CREERAAM]

Mr.LittleInch,

Tanks for your explanation. I have ASME B 31.1 code.

REGARDS,

G.SRIRAM.

Dream,Dream,Dream Dream transforms in to thoughts.And thoughts result in action

 

[CREERAAM]

Mr.KevinNZ,

SIF means SELF REINFORCED FITTINGS?

Thanks in advance.

REGARDS,

G.SRIRAM.

Dream,Dream,Dream Dream transforms in to thoughts.And thoughts result in action

 

[XL83NL]

No. See B31.3 appendix D.