Keller trocken legen pumpensumpf pumpe defekt Rueckschlagventil einbauen 7 a - Drying basement - New submersible pump destroyed after 1 month

Drying basement – New submersible pump destroyed after 1 month

Lesezeit 4 Minuten

Two months ago, I built a sump pit with a sump pump in my cellar to collect the infiltrating water. A submersible pump with an integrated float switch should then pump the water out via a hose.

Unfortunately, things turned out quite differently.


Submersible pump broken after a month?

During my routine checks, I regularly checked the water level in the pump well. The submersible pump worked safely and reliably for a month.

But now I noticed that the pump no longer turns off automatically. Furthermore, the pump rattles and makes noises as if it is about to explode. Obviously, I made a big mistake when creating the sump.

The damp cellar is located under the actual cellar. The house was built in 1900. The exterior walls were drained and yet this basement was always damp as the water entered from below after heavy rains.

To collect this water, a month ago I built a sump in the corner of the basement. The water can collect in the drainage pipe and is automatically pumped out by a pump.

Currently, I direct the water outside to the garden via a ¾ inch garden hose.

 


 

Einhell Schmutzwasserpumpe GE-DP 7935 N-A ECO (790 W, 19.000 ltr./Std., max. Förderhöhe 9 m, Anschluss 47,8 mm, hochwertige Gleitringdichtung, Kunststoff-Edelstahl-Gehäuse, inkl. Universalanschluss)
Einhell Schmutzwasserpumpe GE-DP 7935 N-A ECO (790 W, 19.000 ltr./Std., max. Förderhöhe 9 m, Anschluss 47,8 mm, hochwertige Gleitringdichtung, Kunststoff-Edelstahl-Gehäuse, inkl. Universalanschluss)*
by Einhell
  • Die innovative Eco Power-Serie von Einhell arbeitet mit weniger Stromverbrauch und gewährt gleichzeitig eine höhere Fördermenge. Mit 790 Watt schafft die Schmutzwasserpumpe.
  • Die Sensor-Startautomatik ist auf 3 Höhen variabel einstellbar und schaltet bei einer Restwasserhöhe v. ca. 40 mm und einer Nachlaufzeit v. ca. 15 Sek. (ist kein Problem im Trockenlauf).
  • 24 Stunden rund um die Uhr Schutz vor bösen Überraschungen durch Überflutungen, auch in Abwesenheit.
  • Das im Schlauchadapter integrierte Rückschlagventil verhindert den Rücklauf des geförderten Schmutzwassers. Die hochwertige Gleitringdichtung ist in der Pumpe verbaut ist.
  • Einfach zu transportieren ist die Pumpe durch den stabilen und ergonomischen Tragegriff und integrierter Aufhängeöse für die schnelle Einsatzbereitschaft.
  • Das Gehäuse mit integrierter Kabelaufwicklung ist aus schlagfestem Kunststoff gefertigt Zudem ist die Außenseite mit einer widerstandsfähigen Edelstahl-Außenhaut ummantelt.
  • Das schlanke Design in Verbindung mit dem integrierten Aquasensor und dem Pumpenauslass an der Oberseite ermöglicht auch den Einsatz in sehr engen Bereichen wie z.B Drainagen oder Schächten.
 Price: € 149.99 Jetzt auf Amazon kaufen*
Preis inkl. MwSt., zzgl. Versandkosten
Zuletzt aktualisiert am 21. May 2024 um 07:00 . Ich weise darauf hin, dass sich hier angezeigte Preise inzwischen geändert haben können. Alle Angaben ohne Gewähr. (*) Bei den verwendeten Produktlinks handelt es sich um Affiliate Links. Ich bin nicht der Verkäufer des Produktes. Als Amazon-Partner verdiene ich an qualifizierten Verkäufen. Dein Preis ändert sich jedoch nicht.

 



 

The last days there were again very productive and long-lasting snow and rainfalls. So the water is again pushing into the basement from below.

This morning I noticed that the pump no longer switches off after it has pumped the water out of the shaft. Also, the pump rattles very loudly. Something is not right there.

I got the pump out of the sump and disassembled it on my workbench. It was there that the problem became apparent.


Video – Pump in soakaway defective

By the way, you can find many more videos on this important topic in my playlist on the project Drying out the basement.

If you want to see more of me and my projects, feel free to check out my YouTube channel.

 

Abonniere COMMAIK auf YouTube

 

The pump sucks in stones

Even though I placed the pump in the well on a brick, it sucked in the small rocks I used as drainage and filter from the substrate. These little stones got caught in the pump and caused some damage there.

The pump sucks the water from below through an opening with a rather coarse strainer. So there was no real protection against foreign bodies.

The small stones then got stuck under the impeller and on the sides. The impeller in the pump was scraped. Some corners are also broken off.

Inside the housing, the pressure was then so great that parts of the plastic casing broke off.

This is, of course, very annoying. I simply underestimated the suction power of the pump. Although the pump was 10 cm above the ground, the suction was so strong that it sucked in the small stones.

If you want to replicate this project, be sure to think about adding a filter between the pump and the bottom. Or put the pump more than 10cm above the ground.

 


 

Zuletzt aktualisiert am 21. May 2024 um 12:17 . Ich weise darauf hin, dass sich hier angezeigte Preise inzwischen geändert haben können. Alle Angaben ohne Gewähr. (*) Bei den verwendeten Produktlinks handelt es sich um Affiliate Links. Ich bin nicht der Verkäufer des Produktes. Als Amazon-Partner verdiene ich an qualifizierten Verkäufen. Dein Preis ändert sich jedoch nicht.

 


Repairing the submersible pump with tape and sealant

I have tried to repair my pump. To do this, I fixed the broken parts with tape.

Behind the tape I put a special adhesive. This hardens completely and is waterproof. I sealed the hole in the sheathing the same way.

The repaired areas didn’t really look pretty, but my construction was fit for purpose and worked.

 



The water runs back

Before I put the pump back in the shaft, I solved a second problem which I became aware of through this incident.

I had chosen this pump model because it can easily pump the water up the 5 to 6 meters. Unfortunately, the pump does not have a check valve.

As soon as the pump switches off, the water flows out of the hose back into the shaft.

I originally assumed that only the water from the riser would flow back and the rest would then drain to the outside.

Unfortunately, this is not the case. The pump is well below the surface. As soon as the pressure decreases, all the water runs back down into the shaft due to the negative pressure from the hose.

That would be 25 meters instead of the calculated 5 meters.


Retrofit check valve for the pump

I decided to use a small check valve. The valve has ¾ inch female threads on both sides and is made of brass. The plate and the spring inside are made of stainless steel.

The gasket is made of NBR. This is a synthetic rubber with chemical resistance and high abrasion resistance. So this valve should last a long time.

To be able to screw on the adapter for the garden hose I still need a double nipple with ¾ inch external thread on both sides.

 


 

Kärcher Entwässerungspumpe SP 6 Flat Inox ( 14.000 l/h Wasser, max. Eintauchtiefe: 7 m, max. Fördertemperatur: 35 C°, keramische Gleitdichtung, 23,8 x 28,7 x 35,6 cm)
Kärcher Entwässerungspumpe SP 6 Flat Inox ( 14.000 l/h Wasser, max. Eintauchtiefe: 7 m, max. Fördertemperatur: 35 C°, keramische Gleitdichtung, 23,8 x 28,7 x 35,6 cm)*
by Kärcher
  • Zuverlässiges Abpumpen von bis zu 14.000 Liter klares bis leicht verschmutztes Wasser pro Stunde
  • Automatische Entlüftung ab einem Wasserstand von 7 mm nimmt die Pumpe den Betrieb im Manuell-Modus auf
  • Robuster und einfach anzubringender Edelstahlvorfilter schützt die Pumpe vor zu starker Verschmutzung und verhindert damit eine Verstopfung des Pumpenlaufrads
  • Anwendungsgebiete: Wasserschäden im Haus und im Keller, Abpumpen von Wasser aus Pools und Installation im Drainage-Schacht
  • Lieferumfang: Entwässerungspumpe mit komfortablem Tragegriff, Schlauchanschlussstück, Edelstahl-Vorfilter, keramische Gleitringdichtung
 Price: € 184.25 Jetzt auf Amazon kaufen*
Preis inkl. MwSt., zzgl. Versandkosten
Zuletzt aktualisiert am 21. May 2024 um 12:18 . Ich weise darauf hin, dass sich hier angezeigte Preise inzwischen geändert haben können. Alle Angaben ohne Gewähr. (*) Bei den verwendeten Produktlinks handelt es sich um Affiliate Links. Ich bin nicht der Verkäufer des Produktes. Als Amazon-Partner verdiene ich an qualifizierten Verkäufen. Dein Preis ändert sich jedoch nicht.

 


Are there any alternatives to my sump pump?

The old pump has been running for a week now without any problems. I built a second brick underneath and additionally placed the pump in a wastebasket with a fine grid structure.

Due to these modifications, no more stones are sucked in – however, the residual water level now remains somewhat higher. This is not yet a perfect solution. I’ll have to think of something better.

But maybe you have a good tip for me?

Drop me a line in the comments!

 

Update:

In the meantime, I have replaced the pump with an INOX drainage pump from Kärcher. This pump had already proven to be powerful and reliable when I was working on the pool.

In the pump shaft, this pump now does the work – safely and effectively.

 

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My name is Maik and I have been writing this construction diary since 2008. In addition to my family and job, the expansion and renovation of our art nouveau villa is an important part of my life. Here in the blog I share my experiences. Attention: Some of the linked products are affiliate links. If you order the products through the links, I will be supported with a commission. This has no effect on your price.

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