EN1092-1 FLANGE TAP DRILLING 3/4" NPT

[NAZ1234]

Hello All. Hope you can help. Based on EN1092-1 DN50 PN10/16 Type B Raised Face. I wanted to drill through and tap 3/4" NPT at the centre of the flange.
Should the central through hole 3/4" NPT tapped from the raised face or it should be on the flat opposite face?
Thank you!

 

[comkis]

This sort of joint association is rapid and basic however not appropriate for high presser and temperature applications. Strung Ribs are generally utilized in utility administrations, for example, air and water.
192.168.100.1 192.168.1.1 jpg to pdf