Reducer Thickness

hello,

As you stated above we can make taper on reducer,but my doubt is does code allow us to make taper on any pipe fitting like Reducer ,Tee or elbow (As per B16.9).Have this stated anywhere in code.

How does we write reducer description when ordering it???.Does both end thickness need to be mention or one thickness is enough as I have stated below.

Does reducer 8"X6",schedule 40 means one end thickness will be same as 8",SCH 40 pipe thickness and other end will be same as 6",SCH 40 pipe thickness.

Does same apply for Equal or Unequal Tee???.

You are allowed to make a taper in any fitting (reducer, elbow, tee, ... etc.) or a flange to make a thickness adaptation with the other piping component in which it will be joined. But before making a taper in any piping component, the piping designer/engineer have to make a checking or verification to satisfy himself that the reduced thickness will withstand the design conditions (pressure & temperature).

Question. Does reducer 8"X6",schedule 40 means one end thickness will be same as 8",SCH 40 pipe thickness and other end will be same as 6",SCH 40 pipe thickness.

Answer. Per design calculation, and depending on design conditions which are the same for the same piping system which consists from a variety of sizes, you will find -in a lot of times- that both ends of such a fittings has the same Schedule. And may be -in special cases- you may need a fitting with such a reducer with a Schedule for one side differs from the Schedule of the other side, and you can procure such a fitting with different Schedules of its ends, or you can make a taper to the standard fitting.

I'd like to add that from ASME B36.10M, the NPS 8" Sch.40 has a thickness 8.18 mm, where NPS 6" with the same Sch.40 has a thickness 7.11 mm.

Note. For specifying any fitting with only one Sch., that means all ends of that fitting has the same Sch., otherwise you have to specify every end by the required Schedule.

Mr.Galala,

Thanks you,

You are always there for us.You always helpful to us.

It's my kind request to you to keep on such great work of spreading knowledge.

Dear Mr.Galala, Hello, I want to know what is alternative standard for Socket weld Reducing Tee,Reducer and Reducing coupling,as this are not available in ASME B16.11 standard ??? Thanks.

There are a lot of ready made branch connections, specially those we called O'Let Family such as Weldolet, Sockolet, Threadolet, Nipolet, Latrolet & ElBolet.

See the attached file: Acceptable_Pipe_Branch_Connections.

we use olets for branch connection from big bore line.Here I am talking of reducing tee of 1"X1/2"(socket weld only).In this case we can not use olets on 1" line to take 1/2" branch connection.We have use Reducing tee only which is not available in ASME B16.11.

Lahane82,

Why do you say that "Reducing Tees" are not available in a ASME B16.11 fitting?

I looked on the internet at one of the leading Fitting suppliers here in the US and i see that they are available.

Is it possible that you or someone else there is reading the charts wrong?

Dear PennPiper, I would recommend you to see ASME B16.11 standard not any vendor catalogue.Yes this fitting are available with each vendor but all this fitting will not be as per B16.11.I need recongnized standard for this fitting. If you find this fitting(reducing socket weld) as per B16.11,provide me copy ????

Dear Mr.Galala, What is your comment on question asked regarding recognized standard available for reducing socket weld tee of 1"X1/2" size??

Yes, per ASME B16.11, you can specify and procure a reducing tee with NPS 1 X 1/2, taking into considerations the limits of sizes and classes as indicated in Table 6 "Types of Fittings by Class Designation and NPS Size Range". See the attached Fig. 1.

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Dear Mr.Galala, Yes,Method of designation has been mentioned in the B16.11,But if you see Table 4-Socket welding fitting,no reducing fitting size has mentioned in this table. I had talked to one of our vendor ,they are saying we have to order this as special items.(as not any standard available for their dimension/design) So,as you are saying reducing socket fitting available as per B16.11,so can you provide me piping material specification(for reference only) which you are using. Also,I have checked two vendor catalogue for reducing socket welding fitting ,but in there design are not as per B16.11 but as per their own standard.(specifically they have mentioned this note)

The following attached table indicated at my post #11 is extracted from the code ASME B16.11 and not from another code which indicates that there are a reducing tees:

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Dear Mr.Galala, Yes I know information stated above is from B16.11,But if you see Table 4-Socket welding fitting,no reducing fitting dimension has mentioned in this table.Then why this has not covered????(same I have stated my post).I will request you to see table -4,in B16.11. Also I need some reference document/data to convince your statement to my vendor . Can you provide me same??

I really know and understand very well Table 1 "Socket-Welding Fittings" - edition 2009 (the same Table 4 - edition 2005), and I recommend you and others to understand that table.

What is your interpretation to the the symbol of reducing tee as indicated at Fig. 1 of ASME B16.11 Edition 2009 "Method of Designating Outlets of Reducing Tees and Crosses".

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