What is Factor for Sizing of Self-Priming Unit?

Lift is the factor.

You give no useful information and your problem is not understandable.

Contact a local pump distributor who speaks your language and ask him what you should do.

Thanks for your advice. Fist of all, I will contact the manufacturer.if necessary, I wil post again with detailed information.

Support comes by picking up the telephone and talking to the pump manufacturer's Technical Helpline.

Thanks your advice. Have a good day~

check the manual,there should be a hose connecting the line to primer.

Thank you your advice. I wil check pump manual.Have a good day!

SeZ:

Welcome !

of a search re: self-priming factors (s) of several reasons a self priming pump does not pick up a prime, an easy pdf is as follows:

http://www.cranepumps.com/downloadables/CATALOGS_OIPMs/Manuals%20&%20Instruction%20sheets/093513.pdf

1) "...related to capacity of self-priming unit...." I have found as the pdf states that there are sometimes larger than at the pump inlet, installed inlet pipe sizes selected for flow efficiency and less NPSH Net Positve (negative, too) Suction Head for a pump to even reach its capacity. However, at lifts (and especially intermittent sitting for say for a couple months) at lifts that are high enough to not prime well (hah) there are some better results with a smaller diameter pipe, just not so small that a pump may be damaged.

CAPACITY -

from whether 1 gal/minute or 1000 GPM does have additional factoring to be considered: Please send more detail, but only experienced developing-design /installed is to 2200 GPM and more usually just 6 to 8 GPM on 4 to 5 ton high efficiency GeoThermal(GT)-near-grade of the ground level, refrigeration to water: ice machines and GT Heat Pumps application as chillers or reverse cycling chillers with pumps

~

"Please let me know what is factor for sizing or selection of self-priming unit for pump..."

-factors (s)

are similar but not limited to just lift:

Again at what may be a considerably 'higher-lift' in calculating the pipe drag or friction added to 'the lift' single factor of a few affecting the suction-priming-etc., then using a smaller pipe diameter acceptable to manufacturer's design for the inlet and reducing NPSH of in-to-the-pump, etc, (subjective to more than a single factor) - using just a change to a smaller pipe diameter MAY NOT be best on the NPSH chart, but perhaps, DOES get you the prime needed without too much loss of pumping-flow performance and not a cavitation or other damaging conditions:

as for just a couple of a FEW FACTORS that equal/ or can equal effectual LIFT-affects and systemically is about - "or what should I consider [about some] different condition anything else."

If I am reading your given information with too much presumption, then there is plenty to consider just searching ' self priming pump factors ' - and better pdf's in going to some of those next pages.

your link not working

just repeats "can not..." so going back to general first page, - refresh and re-paste to post...

then it shows up...

I see limited to 3 or 4 replies / day... /too; and although some "less accurate & less-on-topic" replie'rs get to fly all day long with such abusive presumption and "negativity-grenades" that CR4 site very likely does miss 90%+ of the accurate and enthusiastic engineers and consultants and experimenters, etc., - just losing posting interests... we all lose the real view of so very much to see, completely, respectively, and respectfully better people skills and better communication exercised.

http://www.cranepumps.com/downloadables/CATALOGS_OIPMs/Manuals%20&%20Instruction%20sheets/093513.pdf

When I tried this with additional text in the post, CR4 puked in the manner that JP76 described. It posted fine when posted alone. Just a hunk of information to toss on that "Why it no WORK?" fire.

When I saw that there was no hyperlink in JP76's original post, I went directly to copying and pasting the URL into my address bar. Behold! A new addition to my pile for reading!

JP76:

Thank you for your reply.

I will check the pdf contents you have given.

Have a nice day!

Give him a GA then.