Can you install a weldolet to a weld tee?

[choosdog24]

30 weld tee with a 16" weldolet to back side or bottom side (see attached sketch), 150# system.

Thanks in advance

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1612371782/tips/INLET_ASSY_gezt9v.pdf[/url]

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1612371817/tips/OUTLET_HEADER_kenxgl.pdf[/url]

 

[LittleInch]

I don't think there is any reason why not.

Be aware that there are fabricated / forged crosses to ASME B 16.9 which avoids all this.

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[XL83NL]

Code technically, this would make the B16.9 fitting to become an unlisted component and require analysis per 304.7.2, wouldn’t it?

Huub
- You never get what you expect, you only get what you inspect.

 

[pmover]

although the pipe code is not stated, yep, the tee becomes altered fitting and requires analysis.

comment regarding the design provided the flow is down into the tee, i do not believe there will be an even flow distribution. fluid flow, like lightning, takes the path of least resistance.

 

[jojoyohan]

Assuming the code is B31.3, why would the use of a weldolet on a B16.9 tee make that component unlisted? Integrally reinforced branch fittings seem to be allowed on elbows (see figure 328.5.4F), so why not on a tee? Being a listed component means that the components standard is listed in Table 326.1. Standards for piping are also listed in that table, yet modifying the pipe to add a branch connection does not all the sudden make it unlisted.

I do not see where the code would prevent this configuration and require the tee to be unlisted. From a practical perspective, the outlet weldolet might be in the tee's crotch area, and there are no SIF's provided by the code for either configuration.

 

[LittleInch]

If this is a low pressure system then the tee really needs to be a fabricated tee, i.e. the main pipe is a bit of pipe, not a fitting. Then you can do what you like so long as the two holes don't overlap.

On that second one I would like to see what the interface is between the 30" apparently equal tee is and the smaller weldolet.

I suspect the two will interact with each other and that isn't allowed or would need some fancy FEA to see if it was allowable.

I think the second one you will need to move the branch along to pipe so as not to foul the incoming pipe. Or make the header a bigger diameter. Like 48" or something.

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