API pump pressure casing connection : flange vs thread

[billbusy]

Per my past experiences, it is normal practice to use threaded connection for seal flush plans in API pumps as per API 610 section 6.4.3.1, it clearly specifies that all auxiliary connection to pressure casing except the SEAL Gland shall be flange connection

my question is why seal gland connection can be threaded? what is the potiential issues if I use threaded connection on the pressure casing for other service (i.e. bearing lubrication)?

thanks

Oil & Gas industry in Canada.

 

[1gibson]

Don't double post

 

[Chpal1984]

API 682 - Pumps—Shaft Sealing Systems for Centrifugal and Rotary Pumps, has a lot of additional design requirements for the mechanical seal. It could be that the threaded connection is probably ok, because of some addition requirement in 682.

Interesting question though