Posted by CBBC on June 26, 2008 at 22:46:27 from (70.67.127.206):
In Reply to: VFD posted by CBBC on June 26, 2008 at 12:21:22:
I guess I better gulp at that $24000.
Anyway, this pump is irrigating a cranberry field. It is all solid set pvc irrigation with sprinklers set on a 40' X 50' grid. Currently the system is pumping on 16 acres at once. The pump is capable of 25 acres - in theory. There is about 1000' of 10" main TEEing off in two directions and being reduced to 8" then 6" and then 4" mains over about 800' in each direction. Off these 8",6", and 4" mains are 1-1/2" laterals which have the sprinklers. Air in laterals is no problem - it gets forced out the sprinkler nozzels. Air in the main can get traped at the end of the run. This can be a problem as it can be compressed. When the pump is turned off the compressed air expands back into the main pushing the water toward the pump. Unfortunatly there is a anti-flow back check valve which slams shut as soon as the pump turns off. All this air / water comes back and "hammers" at the the check valve / pump / sprinklers etc until the presure is released through the weekest point - either the sprinkller, or a glue joint, flange / victolic fitting or the side of the pipe.
My problem is that I had the pump out. The mains were drained. When it all went back together the pump was not idealy lined up to the victolic coupling. I put the pump on. No leaks, pressure built up good (55psi). I turned it off, but I did not run it long enough to get all the air out. BANG. Pipe shear due to poor alignment and not getting all the air out.
This is the second time in 6 years this has happened to me. My own fault. I thought a VFD or Soft Start/Stop would be the answer, but at thouse cost I just need to tack better care of getting the air out.
Sorry about the long post, but the system is all back together and appears to be running fine for now. Thanks for the replies guys, Grant.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
