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flow rate

In physics and engineering, in particular fluid dynamics, the volumetric flow rate (also known as volume flow rate, rate of fluid flow, or volume velocity) is the volume of fluid which passes per unit time; usually it is represented by the symbol Q (sometimes V̇). The SI unit is cubic metres per second (m3/s). Another unit used is standard cubic centimetres per minute (SCCM).
In hydrometry, it is known as discharge.
In US customary units and imperial units, volumetric flow rate is often expressed as cubic feet per second (ft3/s) or gallons per minute (either US or imperial definitions).
In oceanography, the sverdrup (symbol: Sv, not to be confused with the sievert) is a non-SI metric unit of flow, with 1 Sv equal to 1 million cubic metres per second (260,000,000 US gal/s); it is equivalent to the SI derived unit cubic hectometer per second (symbol: hm3/s or hm3⋅s−1). Named after Harald Sverdrup, it is used almost exclusively in oceanography to measure the volumetric rate of transport of ocean currents.
Volumetric flow rate should not be confused with volumetric flux, as defined by Darcy's law and represented by the symbol q, with units of m3/(m2·s), that is, m·s−1. The integration of a flux over an area gives the volumetric flow rate.

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  1. 127bit

    Baxi Luna HT 380 - how to display/set flow rate?

    The User Guide etc states an available temperature range of 25-80c. Various instructions found online instruct to turn it fully clockwise to display maximum 80c, then back it off and stop at desired flow rate, ie 55c. However, turning the dial fully clockwise (hottest) displays maximum 30c, and...
  2. B

    Problem with flow rate upstairs only

    Hi Could I ask for some help with a water flow rate problem. I have good mains water pressure on the ground floor. There is no tank in the loft but an unvented cylinder in the upstairs airing cupboard. A gas heat only boiler. Upstairs I have two en suite rooms. One with a shower and one with...
  3. U

    Low flow rate (5L/min) at electric shower, 30L/min at stopcock

    Hello, I have quite low flow rate for my electric shower (a piddling 5L/min), and would like some tips or advice about how to solve or find the cause. I would like a flow rate of about 12L/min. Here is my set-up: Standard gas boiler (not a combi) in the kitchen, have cold water tanks in the...
  4. alexic82

    Flow rate of LPG bottle

    Hi Guys Not sure if this is the correct area to post? Firstly, i'm not doing this work myself but I need to get a question answered as it impacts an outdoor kitchen slab i'm going to pour and need to run pipe or conduit under it. Having a commercial LPG griddle installed on the outdoor...
  5. david montgomery

    Hot water tank in a flat has poor flow rate after refurbishment.

    Good morning everyone. My parent had a new kitchen and bathroom fitted in her flat 2 years ago and has only now told me that the hot water flow to both hot taps is really poor. it wasn't like this before. its a flat with a 1075x450 IND BS combi HW tank. she says that the tank was drained down...
  6. R

    Baxi 228 combi boiler hot water flow rate poor?

    Hi, Just checking I'm not talking rot. Today I visited a house with a Baxi 228 combi boiler. The technical spec for the DHW output is shown in the image. Boiler was installed 27 months ago. Baxi is claiming 13.3 litres @ DT 30. I set the boiler DHW temperature to a high setting. I was...
  7. J

    URGENT Can I improve flow rate by reducing diameter of a downpipe?

    Hi, I’m installing a down pipe which goes from the house to a waste water treatment tank. The length of the route is 55 meters and the pipe diameter is 125mm (which collects black water from 5 toilets, grey waters are on a separate pipe). For about 35 meters the pipe has a good inclination of...
  8. V

    Can I oversize a new combi for DHW flow rate?

    I have to replace my combi (Vaillant ecotec 35kw) and installer has suggested Ideal Vogue 32kw. Happy with his advice regarding the model but I see that the DHW is only 13 l/min whereas on the old Vaillant it was 15 l/min Therefore I was wondering about getting the 40kw Vogue as this is...
  9. A

    Pipe size length bends junctions to Combi - affect on water flow rate?

    Hello! Advice required, please. Trying to understand implications of pipe size, length of run, and number of junctions etc. en route between the incoming water feed to the Combi-boiler. For various reasons it is difficult to get from stopcock to boiler without taking indirect route back across...
  10. M

    Changing type of shower flow rate valve

    I have had the following thermostatic shower installed: Moods Round Shower https://www.homesupply.co.uk/Moods-Round-Shower-Pack-2-with-Two-Outlet-Valve-and-Rigid-Riser-Shower-Kit-DICMP0036 The flow rate control on this shower is full on or off. Would it be possible to change this valve to...
  11. M

    Changing flow rate valve

    I have this shower installed: https://www.homesupply.co.uk/Moods-Round-Shower-Pack-2-with-Two-Outlet-Valve-and-Rigid-Riser-Shower-Kit-DICMP0036 The temperature control is variable, but the flow rate control is either full on or off. Would it be possible to replace valve to a variable one? Thanks
  12. dave100

    Advice on replacing solvent weld shower waste pipe into concrete floor

    Hello there! I hope your weekend has started well. TL/DR: Should I replace 90-degree bend with a smaller type to increase the fall from the shower tray? I am replacing a bathtub with a 1500 X 800 Sonas shower tray which I will place on 4-inch blocks, probably with some 18mm marine ply on top...
  13. S

    New taps, poor flow rate

    Fitted these new bathroom taps yesterday. Hooked them up to 15mm pipe work which is on a gravity fed system. Upon first use it was obvious the flow rate was much worse than the old taps. Other than the taps themselfs, the only difference was that i had to fit a 15-10 mm reducer from the...
  14. K

    TAS2000SR Flow Rate Dial not working

    Hi I've just purchased a TAS2000SR but once connected the flow rate dial doesn't seem to change the flow at all. Its completely the same no matter which way the dial is turned. The only difference to my old AS2000XT is that I've located the new one TAS2000SR ~2m further away on the opposite...
  15. W

    Recommend adjustable flow rate shower mount for detachable shower head

    I have a pretty standard hand held shower head. The C-bracket holding it up to the mount is cracked. I searched "shower arm mount" on amazon and got plenty of hits but none of them have the adjustable flow rate feature I want. Any recommendations?
  16. dilligaf

    Shower to powerful (help)

    A friend had a new shower fitted along with a pump but they find it too powerful for them as the person that uses it is in his 80's and it actually hurts him what with his skin being very thin. Its a Aqualisa ipx4 and I wondered if anyone can tell me if the flow rate could be reduced?
  17. J

    My boiler hot water flow rate is slow

    Vaillant Ecotec Pro 28 Running 7 radiators. Outside Tap Cold water flow rate = 12l/s (it took 5s to fill 1l pot) Kitchen Tap - just running cold water = 4 l/s Bristan Shower Mixer - cold water rate = 12 l/s Hot water rate is really low The boiler heats up the water fine -its nice and hot...
  18. L

    Low Mains Water Flow Rate 2 Litres A Minute!!! What Boilers/System Can I Fit??

    Hello, This is my first time posting as I'm a new member so apologies in advance if this has been covered before. I have recently done a landlords gas check at a property with only 1 gas appliance (heat only boiler) and ended up condemning it as it was ID for many reasons. The landlord asked...
  19. S

    Shower valve elbows and flow rate

    Im planning on how to fit a concealed shower valve into a paramount wall which has a narrow cavity depth(35mm) Luckily the rear face of the wall is in the hw cylinder cupboard so i plan to have part of the valve coming through to the cupboard then boxing it in. If i do this the position of the...
  20. J

    Shower flow rate

    In summer months do you get a better flow rate from electric showers as the water may come to shower a few degrees warmer??
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