Sewage lifting system for 150-meter-long wastewater pipe

Hello everyone,

we have bought an old, great house at a very good price. Since the municipality has already provided a water connection + sewage connection at the property, we are subject to the connection obligation.

The distance from the municipal connections (at the street) is about 150 meters away, so this distance (on our private property) has to be laid.

Since the first offer was around 50,000 euros (all in), we are currently looking for a better solution.

The problem with the sewage canal is that it is 3 meters deep, there is a lot of groundwater, and thus massive work in the form of excavation work, etc. is required. According to information from the contractor, the slope would be sufficient (the house is on a slab and is 50cm lower than the street in front, where the municipal connection is 3 meters deep). After leveling, it turned out that we would get exactly 1% slope.

Now my alternative considerations and question to you:

1. If I install a fecal lifting station with a shredder in the old three-chamber pit (of course a stronger one for about 5,000 euros) and feed the wastewater/fecal matter via a 50mm PE pipe over the 150 meters into the public sewage system, is that possible???

2. Then this pressure-driven sewage pipe could be buried at about 1 - 1.20 meters and adapted to the municipal connection located 3 meters deep at the street, within a transfer shaft. Thus, no leveling would have to be maintained and the trench would be much smaller. We could then also lay the fresh water line offset and slightly higher than the sewage line, thus in the same trench. Or am I completely wrong here???

3. Or should I apply to the municipality for permission for a sewage pit?

4. Or do you have another idea, what do you think of the offer (maybe a "defense offer")?

Thank you very much

Hello,

which pipe material and nominal diameter were offered?

At €50,000 it can almost only be copper :-)

To answer your questions I would need more information.

In which federal state is the line to be laid?

What is the soil condition, are demolition or cutting work necessary for laying the line or is it a greenfield site?

From my point of view, the offer for normal installation is very exaggerated, assuming a KG pipe installation DN 100 (material €3 per meter) - DN 150 (€5 per meter)

For 150m, the material costs are therefore about €1000 including fittings.

Where do the high costs in the offer come from?

I would avoid a lifting station, the effort for line installation is also very high as the pressure line must also be frost-free laid, plus the energy consumption, installation costs, maintenance and repair and the emergency situation in case of failure of the system, if you cannot repair it yourself. I don’t even want to mention misuse of the wastewater lifting station and subsequent blockage or damage to the system/pressure line.

The idea of a pit might not be so wrong compared to the €50,000 for pipe installation.

Of course, it must be considered that the suction truck can drive close to the pit, keyword access and load bearing of this by heavy vehicles on a regular basis.

The pit should also not be installed too far from the house, otherwise the expenses for pipe installation will come into play again.

It is also important to find a reliable regular disposer; when the pit is full, showering + toilet + sink etc. is not possible, but that can be arranged.

Water protection area and possibly securing the pit against buoyancy can of course blow the considerations and cost framework, but this can certainly be clarified as a preliminary offer.

Regards Chriz

On site, he roughly calculated in his head based on his notes and said that we would come to about €25,000 gross – then the quote came in at €45,000. So, what can you say about that…..????

(It is a huge company that probably already has full order books)

But even as a layman, I still see one thing:

If I have to dig 3 meters deep and install sewer pipes by sand bedding them, laying them on a slope, possibly pumping out because it’s a flood-prone area, putting in formwork, and then setting a total of 5 large shafts, then it is obvious that a wastewater pressure pipe will be much cheaper.

Sure, a lifting station is added – but there are also low-maintenance systems. In addition, there is already a large three-chamber septic tank present, which I want to have cleaned and in which I will install the compact lifting station (e.g., from Jung with a 115-liter tank).

Or am I seeing this too simply?

Thank you

1% slope is not much, so it requires very precise work and it must be consistent. This is over a length of 150m, meaning also 150 potential meters where something can settle. As soon as even a small part settles over time, it always causes nice blockages... You can only hope that a few maintenance shafts were installed to still be able to flush it yourself using a high-pressure cleaner. Otherwise, for 150m, you would already need to hire a company...

Too bad you don’t answer the questions, it’s hard to assess like this.

.. True, I forgot the inspection shafts, one every 20m, costing about another €1500 psch in materials.

We are at €3000 - €4000 material, and the pipe will only be at 3 meters depth at the end, at the beginning you can certainly lay the pipe more easily and therefore more cheaply without the above-described efforts...

The open questions remain of course..

Regards Chriz

Hello Chriz,
which specific questions did you mean that are still open?

I will receive an offer next week for a 50mm pressure pipe + 32mm drinking water pipe + empty conduit for internet cable + installation of a lifting station in the existing sewage pit.

The company will install a 3-meter deep sewage transfer shaft at the street and bury the pipes using a trench cutter.

I am curious and will keep you updated.

([Für mich wäre noch die Frage offen, welche Hebeanlage ich brauche u.v.a. ob mit oder ohne Schneidewerk??? Wer kann mir das beantworten oder berechen??])

Thank you