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Curve fitting is the process of constructing a curve, or mathematical function, that has the best fit to a series of data points, possibly subject to constraints. Curve fitting can involve either interpolation, where an exact fit to the data is required, or smoothing, in which a "smooth" function is constructed that approximately fits the data. A related topic is regression analysis, which focuses more on questions of statistical inference such as how much uncertainty is present in a curve that is fit to data observed with random errors. Fitted curves can be used as an aid for data visualization, to infer values of a function where no data are available, and to summarize the relationships among two or more variables. Extrapolation refers to the use of a fitted curve beyond the range of the observed data, and is subject to a degree of uncertainty since it may reflect the method used to construct the curve as much as it reflects the observed data.

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  1. B

    Old plastic/ rubber pipe and compatible fitting?

    Hi, a stopcock has seized and I need to replace it but the pipe is an unusual rubber/ plastic material. It’s approximately an inch ID. Has anyone got any advice for replacement compatible fittings? Will it need inserts etc? Thanks in advance and some pics below.
  2. BobThomas

    Valve fitting orientation... horizontal / vertical ?

    Dear all, i’ll get this out of the way first... I’m not a plumber, however i’ve done a fair amount albeit a long time ago (in a galaxy far far away), and i’m after a bit of ‘best practice’ advice, apologies if this is perhaps a daft question ! When fitting, for example, a full-bore pegler type...
  3. Jock Spanners

    Are TRVs mandatory when fitting a new boiler in 2019?

    Evening all, Could someone please clarify this question for me? My interpretation of the current situation is that since Boiler Plus omitted to reintroduce the requirement that all new boiler installs need TRVs on the rads it has been recognised by the EU EPBD and the Government's Domestic...
  4. M

    Anyone identify this fitting?

    Hi Any idea what make these fittings are? Thanks for any help Martin
  5. L

    Slow hot water after fitting new immersion tank

    Can someone please tell me what I have done wrong. Fitted a new tank exactly as old one recently but since then the hot water pressure up and downstairs has been really low. (E.g. A good 10/15 mins to fill kitchen sink) It is a gravity fed system. No gas. So far tried to clear any airlocks...
  6. M

    Is fitting a new boiler in the cellar ok?

    I have an old tank for my hot water system, I'm wanting to have central heating and a combi installed. My options for placing the combi are pretty limited without it being in the way. The gas pipe and electrics all come into the cellar. Would it be an option to install a new boiler in the...
  7. M

    Capping of gas pipe with ef fitting

    I just wonderd when capping of a gas pipe to say a gas hob as an electric one is to be install. Would you tend tocap with an ef cap end or compression. If using ef, what do you do about purging. Thanks.
  8. Ray Stroud

    Fitting a PRV in a tight space.

    I'm about to replace my house stopcock (gatevalve) with a new one (Pegler Lever Ball) and thought I'd take the opportunity to add a Honeywell D05F Pressure Reducing Valve and a Fernox Electrolytic Scale Reducer. However, 'the book' says the PRV must be followed by a straight length of pipe...
  9. I

    Bathroom Basin fitting

    Hello, Is it a must to fix the pedastal to the sink and the skin to the wall? I didnt really want to screw into my tiles, but knowing silicone is a good adhesive is it sufficient? Should the Sink be level front to back all, or should it have a tilt backwards to allow the skin to empty fully...
  10. M

    Boiler service, quote for new and gas cooker fitting

    Hi, we have just moved in to a new house and the boiler seems questionable so we would like it servicing and a quote for a replacement. I have also bought a second hand (12 month old) gas cooker to see us through until we get the kitchen done so we need this fitting and checking over as well...
  11. C

    Gas cooker/Hob pressure testing and fitting questions.

    Hi all, relatively new to the gas industry about a year and normally just do fires and boilers. The only reason i have the cookers ticket is for lgsc's. I am fitting my first freestanding cooker tomorrow and i have a few questions which may sound dumb. 1. Is changing all the injectors...
  12. N

    Steel pipe fitting without thread.

    Hi I've got a steel pipe that's snapped off in the wall (see the photo). It travels through the wall and into a screeded floor. Is there a fitting suitable for gas or a way to thread the pipe without chopping half the wall away?
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