Hairdressing salon waste water pump

[gingalig]

I've been asked to quote for a refurb of a shop and conversion to a hair salon, There are proposed 6 wash stations over 2 floors, no gas and no way of getting it, so I would be using a specialised direct unvented with 4.5 kw and 3kw immersions ( I am G3 ) to provide the hot water ( 24lts/min, 22mm incoming mains) I have been advised a 300ltr version, would suffice but would like a formula to calculate the precise requirements if possible, as the advise came from a sales guy at a salon supplier and I would like to check.
There would be 2 specialised treatment stations which I understand have significantly more requirements for hot water. My other concern is , (and I'm not really familiar with the solutions) the building is a lower floor shop front to the ground floor and the 1st floor is also at ground level as its built into a gradient. The wastes all terminate on the 1st floor with an external 110mm outside that does not extend to the ground floor. Apologies if I'm not explaining it very well, but in short I have been asked to also provide a disabled access W,C to the ground floor and also need to provide a way to remove the waste water from the work stations. I know a macerator would cope with the W.C but it would not cope with the volume of waste water. I know that there are various solutions, but I'm looking for recommendations that have been tried and tested and would work in this situation. Sorry about the lengthy post and thanks for any advice in advance.

 

[ShaunCorbs]

Average hair wash 10 mins

Around 10lpm mixed

6 l hot 4 l cold

So around 60l per station required

So around the 360l ish my recommendation is 400l direct fast recovery unvented cylinder eg under 40 mins

High / fast recovery recommended

Have a look at SANIFOS 110 – floor-standing wastewater removal station – SANIFLO

 

[gingalig]

Average hair wash 10 mins

Around 10lpm mixed

6 l hot 4 l cold

So around 60l per station required

So around the 360l ish my recommendation is 400l direct fast recovery unvented cylinder eg under 40 mins

High / fast recovery recommended

Have a look at SANIFOS 110 – floor-standing wastewater removal station – SANIFLO

Average hair wash 10 mins

Around 10lpm mixed

6 l hot 4 l cold

So around 60l per station required

So around the 360l ish my recommendation is 400l direct fast recovery unvented cylinder eg under 40 mins

High / fast recovery recommended

Have a look at SANIFOS 110 – floor-standing wastewater removal station – SANIFLO

Cheers Shaun, that looks ideal, and thanks for the calcs.

 

[Marc Bowers]

Cheers Shaun, that looks ideal, and thanks for the calcs.

The only problem with that calc is that it assumes the wash stations will be used only once in every hour. they could all be used continually in which case the amount required is 6 times that.
You have to take in to account how many cutting stations feed the wash stations, what the worst case for washes as a ratio to just cuts is going to be and check what the output is of the proposed hand rinses as 10lt min could be a bit low (Salons tend to use high flow rate low pressure) I have worked in a Tony and Guy salon which only has 3 wash stations but runs a 400lt direct UHWC with 2x 3phase immersions which is 18kW. What the Salesman probably doesn't know is that heat recovery on direct is so much worse that indirect and you've got to assume that one day the salon will have a wedding party to cope with and you can't afford to have a system that can't cope with the full demand of the salon.

 

[rpm]

I would go for a duplex system to be on the safe side and don`t forget you need a vent.

 

[Marc Bowers]

Excuse my lack of understanding, by Duplex do you mean two cylinders in parallel? In which case I would agree if space and incoming power permits, plus the advantages of maintaining limited supplies during servicing and repair or reducing power consumption during prolonged periods of low demand. Megaflo do a commercially focused product with reduced recovery times over their standard product and zip make some high powered (27kW) instantaneous models if space but not power are an issue. (I’ve been looking at solutions for a similar dilemma - what I would do for a gas supply and appropriate location for a boiler!) Also of note, they’ve stopped producing direct horizontal unvented cylinders.

 

[rpm]

Excuse my lack of understanding, by Duplex do you mean two cylinders in parallel? In which case I would agree if space and incoming power permits, plus the advantages of maintaining limited supplies during servicing and repair or reducing power consumption during prolonged periods of low demand. Megaflo do a commercially focused product with reduced recovery times over their standard product and zip make some high powered (27kW) instantaneous models if space but not power are an issue. (I’ve been looking at solutions for a similar dilemma - what I would do for a gas supply and appropriate location for a boiler!) Also of note, they’ve stopped producing direct horizontal unvented cylinders.

I was refering to a Duplex pump system, sorry for confusion.