Distance from discharge flange to 90 dgr bend

[ChiefengO]

Hello pump spesialists

We will instal a horizontal ballast pump with capasity of 1500 m3/hr at 23 mtr head, pumping sea water.
The suction pipe is 20" and discharge is 16".
The hight from the discharge flange to the roof is 0.90 mtr. I remember reading somewhere that there is a required distance from the discharge flange with straight pipe before you should connect the bend.
Can anyone here advise what that distance should be?

thanks in advance

ChiefengO

 

[pennpiper]

ChiefengO,

Please remember that the same people that tell you

"That there is a required distance from the discharge flange with straight pipe before you should connect the bend"

Are the same people that tell you that mathematically a Bumble Bee cannot fly.

 

[ChiefengO]

pennpiper

hihi, See your point

Mathematically you need it, but in practice it will not make a difference.

 

[dcasto]

The only restriction would be on the welds. There are discussion on this all the time. The concensus is not to either weld the 90 to the flange or allow a short piece of pie (a pup) that is long enough that the heat effected zones from the welds do not overlap.