Go Back   InterNACHI Inspection Forum > Specific Inspection Topics > Plumbing Inspections

Notices

Plumbing Inspections Contains discussions about plumbing.

Reply
 
LinkBack Thread Tools
  #1  
Old 6/16/09, 12:45 AM
sshockley's Avatar
sshockley sshockley is offline
InterNACHI Member
 
Join Date: May 2009
Location: Salisbury, Maryland
Posts: 259
Default Goulds 1/2 hp, jet pump, discharge pressure

I had a Goulds 1/2 hp shallow well jet pump that I had checked the cut in and cut out pressure to be 25/38 psi. Everything I've read states that this number should be closer to 30/50 psi. I was wondering if anyone has any details on these pumps that might clarify this. Just wondering if this should be reported as a problem that needs attention. The water pressure in this house was horrible as a result.



Thanks,

Steve
Reply With Quote
Find an InterNACHI certified Nevada Home Inspector (and anywhere else in North America)
  #2  
Old 6/16/09, 7:24 AM
gwilcox's Avatar
gwilcox gwilcox is offline
InterNACHI Member
 
Join Date: Jan 2007
Location: Harvey, ND
Posts: 333
Default Re: Goulds 1/2 hp, jet pump, discharge pressure

Steve
It is common for the pressure switch to be set at 20/40, 30/50, or 40/60. I would say that someone has tried to increase pressure by adjusting it. You can usually get 8-10 lbs of adjustment (increase) on a switch. Stange pressure differentials sometimes indicate that someone has messed with the small screw ( Square D ), which if I remember correctly is the cut in only, the tall screw raises the cut in and out screw and maintains the 20lb differential. In any case I'd want to know what the gpm are and what size the storage tank is. If there is adequate water volume, you could hold the contacts of the switch closed to increase presssure to determine that the line to the switch is clear, not corroded or partially plugged at the fitting in the pump housing or at the switch. Then recommend a replacement switch 30/50 or 40/60.
Reply With Quote
  #3  
Old 6/16/09, 7:28 AM
Larry Kage, CMI Larry Kage, CMI is offline
InterNACHI Member
 
Join Date: Jul 2004
Location: NW, MI
Posts: 12,033
Default Re: Goulds 1/2 hp, jet pump, discharge pressure

Quote:
Originally Posted by sshockley View Post
The water pressure in this house was horrible...

Thanks,

Steve


Then, report that and refer it out to a qualified professional.



InterNachi Awards Portal: http://co.nachi.org/inachiawards/
____________________________________________
"An Education, not just an Inspection"

Larry Kage, CMI
whis11 @ charter.net
The above post represents my personal opinion.
Reply With Quote
  #4  
Old 6/16/09, 7:33 AM
gwilcox's Avatar
gwilcox gwilcox is offline
InterNACHI Member
 
Join Date: Jan 2007
Location: Harvey, ND
Posts: 333
Default Re: Goulds 1/2 hp, jet pump, discharge pressure

Of course plugged aerators, showerheads, flush valves, and distribution piping could also be the cause of low pressure.
Reply With Quote
  #5  
Old 6/16/09, 10:25 AM
Frank P. Newman Frank P. Newman is offline
InterNACHI Member
 
Join Date: Aug 2007
Location: Dublin, GA
Posts: 693
Default Re: Goulds 1/2 hp, jet pump, discharge pressure

Quote:
Originally Posted by gwilcox View Post
Of course plugged aerators, showerheads, flush valves, and distribution piping could also be the cause of low pressure.
Note also that the possible discharge head of any centrifugal pump can be affected by the suction lift as well. So, if the water table at the well is low for some reason, the pump will not perform as well.



Frank P. Newman
Emerald City Inspections, LLC
Dublin, GA
Reply With Quote
  #6  
Old 6/16/09, 8:45 PM
sshockley's Avatar
sshockley sshockley is offline
InterNACHI Member
 
Join Date: May 2009
Location: Salisbury, Maryland
Posts: 259
Default Re: Goulds 1/2 hp, jet pump, discharge pressure

Sorry. Here are a few more details on the pump and tank. The pump is only putting out 2-1/2 gal/min, I think for a non-submersible jet pump this should at least be 6 gal/min. The pump is connected to what looks like a 12 -14 gallon horizontal pressure tank. There was also a water treatment system inside the home.

Attached a picture file using the attachment icon. Not sure how the "Attach Image" function on this group yet.

Thanks for all of the feedback.


Regards,

Steve
Attached Thumbnails
goulds-1-2-hp-jet-pump-discharge-pressure-229.jpg   goulds-1-2-hp-jet-pump-discharge-pressure-226.jpg  

Last edited by sshockley; 6/16/09 at 8:51 PM..
Reply With Quote
  #7  
Old 6/16/09, 9:12 PM
Joe Farsetta's Avatar
Joe Farsetta Joe Farsetta is offline
InterNACHI Member
 
Join Date: Oct 2002
Location: Pearl River, NY
Posts: 5,836
Default Re: Goulds 1/2 hp, jet pump, discharge pressure

First off, that looks like like a single pipe pump. With nozzle and venturi, you're looking at like MAYBE up to around 30 feet of depth.

There are too many variables to consider without having the specific knowledge to perform a more indepth investigation. Sure the intake can be clogged, but I suspect that the pressure switch was jacked with, or may be defective.

Shallow wells are most susceptible to overdrafting and contamination.
Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Water Pressure..... David Smfh Plumbing Inspections 7 5/4/08 1:49 PM
980 Questions/Answers to the NHIE....Free! jbushart Legislation, Licensing, Ethics & Legal Issues for Inspectors 50 4/20/08 1:26 AM
Reverse Osmosis phinsperger Plumbing Inspections 3 10/30/07 6:28 PM
sump pump discharge vwood Plumbing Inspections 10 6/18/07 10:59 PM

All times are GMT -4. The time now is 10:20 PM.
no new posts