Digester Man
Member
Can’t say as I haven’t used it, but proper ferric chloride is REALLY corrosive. Don’t let it get on anything. Does yours come with a warning label or did the seller give you any verbal advice on handling it?
AD plant foam and H2S solutions?
- Thread starter Chippy
- Start date
- Location
- North Norfolk
Just don't use stainless pipework. It will dissolve it overnight. Plastic only.
Don’t say that [emoji23]
I’m one of the fortunate ones that has stainless pipes because people with plastic have had them crack in the tank and cover needs taking off and store needs lowering to fix it
- Location
- North Norfolk
Its just for the concentrated ferric, when its mixed in then there is no problem. Our pipework is stainless above ground and plastic below. I think it might have been Kemble where the pipework dissolved.
- Location
- Cumbria
Please check where you apply the ferric and follow advice on application rates. Once incorporated (say in the reception pit) with a volume of slurry you have lower risk, once inside the digester minimal risk. if pipes were damaged this was partially because of: 1) lack of fall. 2) No disposal/ catch wells 3) Poor quality stainless.
This should be part of the plant HAZZUP or HSSUP (never sure which one) plan....!!!!!!
In addition, record the dates/times/application rates/type of product etc
- Location
- Cumbria
How's it going Chippy, are you getting on top of the H2S and foaming problems ?
No but I’m in contact with guy from For Farmers who’s really helpful and just waiting for his prices on iron Hydroxide, anti foaming stuff and carbon. The liquid iron chloride I’m currently putting in isn’t getting my H2S any lower than 2000ppm so will try Hydroxide. Cooking oil seemed to be less effective as the anti foaming stuff but anti foaming stuff twice the price [emoji30]
- Location
- North Norfolk
Ours had a major overhaul last August, 56,000 hours or 6 1/2 years. Minor overhaul every 28000, new turbo every 14000. Hope it lasts well past the next overhaul at 112,000 hours.
- Location
- Cumbria
If a service contract was in place for a larger unit.
The main (big) services are every 10-12000 hours, however the cost very much depends on the quality of gas/ H2S etc being used. Being low in H2S is critical as this is the most difficult and damaging. However, having good quality Biogas, from an efficient, clean operating digester is also important.
All to often this is overlooked at the point of purchase, and many £00.000's in service costs are poured down the drain.
So, ensuring only clean gas with a max 250ppm H2S going into the CHP is important, above this, it may be cheaper to flare it off.
Don't believe any bxxxhit about "our CHP will operate up to 1000ppm H2S" unless the statement is backed up with a bulletproof guarantee.....
They will all operate at that level !!!!!
- Location
- Cumbria
Deutz 12000 hours
Digester Man
Member
You should have a service manual Chippy, it will give your intervals.
On my engine (MAN) it’s 25,000 hours for top end and 50,000 hours for top and bottom end rebuild. I’m at 19,000 so far, time slips in wayyy to fast
On my engine (MAN) it’s 25,000 hours for top end and 50,000 hours for top and bottom end rebuild. I’m at 19,000 so far, time slips in wayyy to fast
- Location
- Cumbria
Rob, at 50000/60000, I assume they replace with basic engine assembly, rather than a re-build ?
Digester Man
Member
No, it’s an actual rebuild (pistons liners bearings etc) into the existing block and it should then be good for another 25k hours and maybe beyond.
However when the time comes I will weigh up the cost of downtime, parts and labour against fitting a new engine. I don’t have a service contract so I am free to do whatever I feel will work best.
However when the time comes I will weigh up the cost of downtime, parts and labour against fitting a new engine. I don’t have a service contract so I am free to do whatever I feel will work best.
- Location
- Cumbria
Normally 10k hours is the first bill of any significance, (around £5,000) however 20k hours is meaty (around £70,000), 40k hours meat and veg (around £80,000) and 60k hours a five course dinner. (around £160,000) however that would be for a 1.2-1.5MW engine. if you are in a life-cycle service contract these costs are part of the monthly payment, if not, a hole in that years balance sheet
But ! maintenence is not all bad, and is still very tax effective.
- Location
- North Norfolk
Which MAN do you have? We run the straight 6 turbo intercooled to give us 170kW electrical. Set built by IET in Austria and an excellent piece of kit.
Digester Man
Member
Hi Stephen, mine is a V12 500kw. Built into genset in Germany by Hochreiter and serviced locally by ourselves and a local mechanic
- Location
- North Norfolk
We do all minor servicing ourselves, but the big jobs - liners etc we use Cooper Ostlund who we can highly recommend