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In graph theory, a cut is a partition of the vertices of a graph into two disjoint subsets. Any cut determines a cut-set, the set of edges that have one endpoint in each subset of the partition. These edges are said to cross the cut. In a connected graph, each cut-set determines a unique cut, and in some cases cuts are identified with their cut-sets rather than with their vertex partitions.
In a flow network, an s–t cut is a cut that requires the source and the sink to be in different subsets, and its cut-set only consists of edges going from the source's side to the sink's side. The capacity of an s–t cut is defined as the sum of the capacity of each edge in the cut-set.

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  1. seha1997

    Can I just cut this pipe to length?

    Hi guys, first post here So I have been boxing in a number of heating pipes that are throughout my garage since the boiler was located there by the previous owner, they decided to run pipes all along the edge of the garage floor... I do however have one that goes vertically out of the concrete...
  2. O

    Cast iron toilet waste pipe. Needs to be cut down?

    Hi I need to this cast iron pipe back as my new back to wall toilet won’t fit otherwise. Cutting it back i am going to lose the collar. So what fitting can I get for it I would like a flex as it will easier for me when installing the new toilet
  3. A

    Boiler not working after power cut

    Hi all, I have a viessmann vitoden 100 w boiler and we have had a three hour power cut this afternoon/ evening. The boiler switches on and the temp just goes down and then flashes up 0c. From what I can see this error code means blocked burner? The oven also will not ignite. I have tried to...
  4. B

    Water in my house cut out after toilet flush

    We have recently had water hammer issues. Plumbers have installed an arrestor near our kitchen sink and a device in the toilet cistern to slow water shut off. Worked for a bit, but hammer returned. This morning, while the toilet was refilling and the shower was on, there was a loud thud that...
  5. S

    AS2000X stuck in comissioning mode after power cut. PCB replacement?

    Morning All, hoping you can help me out with some advice. I have a triton AS2000x manual power shower, we had a power cut last night after the power was switched back on around 20 minutes later I heard the shower running . It seems to be stuck in comissioning mode. So Ive turned off the power to...
  6. G

    Surging jet pump not reaching cut off pressure

    Hello, I need some help. Problem: my jet pump fluctuates between 15-35psi and will not build any pressure higher than that. There is a swooshing or surging sound that continually occurs. Location: it pulls water from a lake to supply the house. Lift is 40ft distance from foot valve to pump...
  7. C

    Cut flow and return pipes

    Hi , need to cut flow and return pipes and hot and cold pipes from boiler to put back into wall vertically approx 3 inches , the pipes in question are 400mm below combi boiler but approx 4mts in distance horizontally , if I was to drain a radiator (I don’t have a drain valve ) would this remove...
  8. H

    Pre cut holes in bath

    Hi, I have a bath needs to be replaced but I need to make sure that the bath that I find is able to have a side tap (if that makes sense) as we already have a tap on the wall. Our bath is 1500sm and I am just wondering if baths come with the water and drainage holes pre cut or if they are cut...
  9. T

    Self cut tap blanking

    Hello, just joined with a question: I’ve two self cutting taps that need removing as they’re stopping a relocated dishwasher from getting back far enough. The pipe layout is awkward at best and I’m ready to fit an inline tap further along out the way. So my question is rather than mess about...
  10. C

    Hello all my questions is

    I need the pre charge pressure of the vessel if the required cut in pressure is 2 bar
  11. R

    What are you using to cut stainless 88.9mm pipe.

    We are using a the rigid 65s pipe cutter for the smaller stuff but we have a load of 88.9mm x 2mm stainless coming up and was looking for a decent pipe cutter. Any suggestions?
  12. S

    Why do my Crosswater digital showers cut out?

    We have 2 Crosswater digital showers with a duo water control system. Last Autumn, one of them started cutting out at the start of a shower 2 or 3 times before finally working ok. It then seemed to correct itself over the winter. However this has now recommenced. Also during the last 2 weeks...
  13. D

    Can I cut a shower tray?

    Hey there, I purchased a black slate shower tray from a supplier. The supplier recommended that we cut it down to our required size. Is this good practice/possible? Some plumbers I speak to say absolutely not to. Others seem OK with the idea. I hope to cut it down to around 1600x700. Cutting...
  14. T

    Do I cut this pipe to fit

    hi can any one give me any tips on cutting this waste pipe I know you use an Axa saw. I don’t whant to cut it to short do I cut the top fist or the bottom
    • tvsteve175
    • Thread
    • america cut pipe usa
    • Replies: 5
    • Forum: USA
  15. M

    Shallow trap to cut into screed

    Hi all. Hooing for some advice on a shallow trap. The waste goes to a gulley. Either for a small height shower tray or to cut out the screed for a wetroom and backfill with the correct fall to drains. Thanks
    • mutley racers
    • Thread
    • america cut screed trap usa
    • Replies: 8
    • Forum: USA
  16. D

    Pan Connector to Soil Pipe - Cut or not to Cut

    All, We have an old soil pipe stack which has an inner diameter of 90mm. I presume it is a pitch fibre soil pipe (it's not cast iron). I have been down the local plumbers' merchants and sourced a suitable pan connector, namely a McAlpine WC-CON7B. The toilet outlet is around 30mm higher...
    • DazJWood
    • Thread
    • america connector cut pan pan connector pipe soil soil pipe usa
    • Replies: 4
    • Forum: USA
  17. A

    Marflow PL8 Bracket Hole Cut Out

    Just about ready to fit wall panel over this bracket, instructions say 50mm cut out around pipes, this seems a bit excessive, can anyone advise if i can go smaller than this?
    • alfa20ad
    • Thread
    • america bracket cut cut out usa
    • Replies: 1
    • Forum: USA
  18. M

    Central Heating cut and shut

    Hi All, Just a quick question, would it be possible for me to shut the gate valve to the flow pipe to the central heating and open the return at any radiator without it causing a mess? From what i know, the flow goes in to the radiator and after coes out as the return, so technically if the...
    • Mabzrt
    • Thread
    • america central central heating central heating system cut heating usa
    • Replies: 6
    • Forum: USA
  19. T

    Mixer tap flexible hose being cut

    Hi, I have a mixer tap with flexible hose which have been cut on the bottom. Can they be reconnected? what type of connector I need?
    • tonyCC
    • Thread
    • america being cut flexible hose mixer mixer tap pipe tap usa
    • Replies: 5
    • Forum: USA
  20. L

    Oil Tank cut off solenoid

    Is it acceptable to place a cut off solenoid valve on the output of an elevated oil tank? Reasoning being that the oil pipe goes into the house to feed the boiler, should there be a leak within the house theres a chance it may be more likely to be noticed when the boiler is on than off. So the...
    • lostdirection
    • Thread
    • america cut oil oil tank solenoid tank usa
    • Replies: 3
    • Forum: USA
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