Vertical In Line Pump Installed Horizontally
Vertical In Line Pump Installed Horizontally
(OP)
I am Civil/Structural, but as an Owner's representative am involved with all aspects of building design and construction. We have a situation where a vertical in-line pump has been installed in a horizontal position. This is a 1/2 Hp pump that serves a primary boiler loop. The design flow is 48 GPM at 15 ft. head. The pump is providing 42 GPM at a delta P of 8.7 ft. Could this reduced flow be due to the pump orientation?





RE: Vertical In Line Pump Installed Horizontally
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Vertical In Line Pump Installed Horizontally
Possible causes:
Excessive wear ring clearance.
Excessive impeller lift.
Plugged suction strainer.
Inaccurate flow meter.
Inaccurate pressure gauges.
Calculation error: Wrong specific gravity.
Calculation error: Failure to properly compensate pressures for elevation.
Inadequate NPSH available (pump is cavitating)
Pump not properly piped.
Pump not properly vented and flooded.
Open or leaking spill-back line.
Leaking check valve on spare pump installed in parallel.
Inadequate submersion on suction (air ingestion).
Impeller diameter does not match the curve.
I'm sure that there are several hundred other possibilities. If you can provide more details, we might be able to shorten the list.
Johnny Pellin
RE: Vertical In Line Pump Installed Horizontally
Be prepared to explain (and defend) why the "Vertical In-line Pump" is not installed in the "Vertical".
RE: Vertical In Line Pump Installed Horizontally
RE: Vertical In Line Pump Installed Horizontally
To me, the reduction in performance is not so "horriffic" that it can't be explained, at least in part, by poor overall pump installation and orientation. It's a small pump; it probably wouldn't take much to make it work poorly.
But...that's just me...and I'm not a pump guy.
Regards,
SNORGY.
RE: Vertical In Line Pump Installed Horizontally
Is it simply in-line with the fluid system? (that would seem to cover almost all pumps except perhaps eductor types).
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(2B)+(2B)' ?
RE: Vertical In Line Pump Installed Horizontally
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(2B)+(2B)' ?
RE: Vertical In Line Pump Installed Horizontally
There is no vertical piping, but shaft is vertical
http://
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(2B)+(2B)' ?
RE: Vertical In Line Pump Installed Horizontally
Yes, that picture shows a typical "vertical in-line pump"
The shaft of the pump is vertical with the motor on top.
The pump suction nozzle is on the right.
The pump discharge nozzle is on the left.
There is no piping shown.
Just a side note:
Many people believe that the "Rule" for this type of pump is it does not need a foundation for support or stabilization (resistance to starting torque). They believe the pump can be supported by the suction and discharge piping.
The "Exception" to this is the size/weight of the pump vs. the size of the piping. There is also the question 'how do you support the pump when you need to remove some part of the piping or valves for maintenance?'
Google "Vertical In-Line Pumps" and you will see thousands of links, some of which show pictures. Here is one of the best links: http:/
RE: Vertical In Line Pump Installed Horizontally
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(2B)+(2B)' ?
RE: Vertical In Line Pump Installed Horizontally
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Vertical In Line Pump Installed Horizontally
With the relatively flimsy construction shown in the links and highlighted by pennpiper, it seems that moment associated with the weight of the motor hung on the side of the pump casing could introduce distortion which might affect centering of impeller with respect to stationary parts.... could it affect the fluid performance?
(Of course there are many other possible reasons for apparent degraded pump performance as eloquently described above).
At any rate, I'd wonder about the long-term reliability when installed in this fashion.
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(2B)+(2B)' ?
RE: Vertical In Line Pump Installed Horizontally
http://co
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Vertical In Line Pump Installed Horizontally
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(2B)+(2B)' ?
RE: Vertical In Line Pump Installed Horizontally
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Vertical In Line Pump Installed Horizontally
RE: Vertical In Line Pump Installed Horizontally
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Vertical In Line Pump Installed Horizontally
It is a huge mistake to think that this applies across the board with all vertical inlines. If you cannot pick the pump up and toss it 25 feet, DO NOT install it any other way than vertical; and that being with the motor on top.
.
RE: Vertical In Line Pump Installed Horizontally
Horizontal orientation with vertical upflow might work. I was thinking more about horizontal orientation with horizontal flow and the cutwater at the bottom of the pump; that might not work quite as well.
Thanks Artisi. Learn something new every day.
Regards,
SNORGY.
RE: Vertical In Line Pump Installed Horizontally
RE: Vertical In Line Pump Installed Horizontally
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Vertical In Line Pump Installed Horizontally
RE: Vertical In Line Pump Installed Horizontally
Yes, that was what I was trying to explain, in a poor fashion. It is based on a "once upon a time" experience that I had years ago with a vertical in-line condensate stabilizer reflux pump. At a certain percent open on the reflux pump discharge flow control valve, there was a significant drop in throughput to the column that I read using a Polysonics Doppler Meter. There wer no audible signs of cavitation, and at the flow setting coincident with column pressure, there ought not to have been a capacity problem. When I (with the Operator) opened the pump casing drain to qualitatively assess the nature of the liquid, we found that it was rapidly boiling off even when we dumped a 45-gallon of Northern Alberta January snow on the suction piping. What I decided to do, right or wrong, was tie a restriction orifice / needle valve / tubing installation from the casing vent back to the reflux drum vapour space, with a view towards being able to allow any broken-out vapours to be expelled. This change, after a suction piping optimization and the installation of a flow-inducer imeller in the pump, provided enough incremental performance improvement to achieve the desired reflux rate.
Regards,
SNORGY.
RE: Vertical In Line Pump Installed Horizontally
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Vertical In Line Pump Installed Horizontally
In an ideal situation, it should be at the top.
RE: Vertical In Line Pump Installed Horizontally