Flange 4" 150 RF Blind c/w 2" NPT Center Tap A105 N
Flange 4" 150 RF Blind c/w 2" NPT Center Tap A105 N
(OP)
Hello everybody,
Can anyone please send me a photo were the flange with the given description is shown?
Flange 4" 150 RF Blind c/w 2" NPT Center Tap A105 N
Any help is appreciated.
Thank you.
Can anyone please send me a photo were the flange with the given description is shown?
Flange 4" 150 RF Blind c/w 2" NPT Center Tap A105 N
Any help is appreciated.
Thank you.





RE: Flange 4" 150 RF Blind c/w 2" NPT Center Tap A105 N
Unless you have a very, very large diameter and very, very thick flange.
RE: Flange 4" 150 RF Blind c/w 2" NPT Center Tap A105 N
Thank You for your reply.
Can you please explain why that use the word blind and after that NPT center tap?
Am I missing something?
Thank you.
RE: Flange 4" 150 RF Blind c/w 2" NPT Center Tap A105 N
In that case it is not the above at all. The tap is through the blind flange's thickness, right in the center of the flange. Right in the middle of the "O"
In which case a 2" probably fits.
RE: Flange 4" 150 RF Blind c/w 2" NPT Center Tap A105 N
Regards.
RE: Flange 4" 150 RF Blind c/w 2" NPT Center Tap A105 N
RE: Flange 4" 150 RF Blind c/w 2" NPT Center Tap A105 N
Regards
RE: Flange 4" 150 RF Blind c/w 2" NPT Center Tap A105 N
RE: Flange 4" 150 RF Blind c/w 2" NPT Center Tap A105 N
RE: Flange 4" 150 RF Blind c/w 2" NPT Center Tap A105 N
Making 2" NPT thread on 4" Blind flange is prohibited by ASME B16.5 (regardless to flange class)
Please see in Table 6 for reducing flanges, at columns 3+4: the smallest size of reducing outlet requiring Hub Flange for NPS 4" is 1.1/2"
As you all very well know, Blind Type Flange IS NOT Hub Flange, so, 2" outlet on 4" Blind is prohibited.
What you need here is: Threaded Reducing Flange 4"X2" #150 RF. As per ASME B16.5
It is hubbed flange, as it appears at bimr's post above.
RE: Flange 4" 150 RF Blind c/w 2" NPT Center Tap A105 N
Shmulik is correct as well, but the poster has not said that this is a code piping application.
While the Blind flange is used to cap off the end of a pipeline or a future branch connection it is also used for other purposes. It can be drilled and tapped for a threaded reducing flange or machined out for a Slip-On reducing flange. The reduced opening can be either on-center or eccentric.
Picture of blind flange.
Here is a picture showing a pipe screwed into a drilled and tapped blind flange.
RE: Flange 4" 150 RF Blind c/w 2" NPT Center Tap A105 N
RE: Flange 4" 150 RF Blind c/w 2" NPT Center Tap A105 N
- 4" Hig Hub Blind Flange
- Class 150
- 2" NPT hole
A reducing may be more expensive in some cases, although I think that in this case the flange from which the result is machined (i.e. either the Hig Hub Blind Flange, or the Reducing threaded flange) has the same starting point/geometry.