Suction Line for Centrifugal Pump

Cant be done!

No smaller than the inlet connection to the pump.

my dear pump size would be4Χ3Χ13 may be overhaung

Post 1 is incorrect; knowledgeable people can do this.

Post 2 is correct, as a minimum (and might be sufficient in this case).

Post 3 is irrelevant. Just mount the pump on a tall enough base to keep the volute from scraping the floor.

What is the temperature of the hot water? How many gpm? These are required data.

If there are any reducers in the final pipe approaching the pump suction, they should be eccentric, with the top flat. Ideally, there should be a straight section 6 x D = 24" length of 4" pipe entering the pump suction flange.

I'm not disputing what you say I actually have a question regarding your post. Can you remind me why it is best to have an eccentric reducer with the flat bit at the top rather than a concentric reducer?

I'm pretty sure I've been told that before but for the life of me I can't think why.

Have a feeling a Homer Simpson Doh!!! moment is about to happen.

a)Placing an eccentric reducer at the pump's suction flange should be done with the smaller diameter (pump flange) AT THE TOP. This is a time and experience-tested method of avoiding the formation of voids or air pockets in the suction line. However, in the special case of slurries, the opposite orientation (small diameter at the bottom) is what should be done. The latter orientation aids in solids flushing action and discourages suction line plugging

b) Use eccentric reducers rather than concentric reducers at the pump suction. Concentric reducers will trap air. Be sure the eccentric reducer is not installed up side down.

and also in CR4, this has a good explanation from AM

Thanks for that. Should've done a bit of research on CR4 myself.

1) Always use one size higher Suction Pipe than pump suction size. This is to minimize velocity losses. 2) Use Eccentric Reducer. This is to avoid air Pocket in side suction line a)Eccentric Reducer will arrange with bottom flat when sourse of supply above the pump(+ve suction head ) b) Eccentric Reducer will arrange with Top flat when sourse of supply below the pump (-ve suction head ) 3) Pipe Line should be straight at list 5 x D (Dia of Pump Suction). (Donot use restriction such as Strainer, valve, bend s within "5 x D" distance from suction of the pump)