Boiler making advise

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Boiler making advise

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Viewing 14 posts - 1 through 14 (of 14 total)
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  • #460796
    AdrianR
    Participant
      @adrianr18614

      Hi,

      I am going to make a myfordboy vertical boiler. It is 2.5" dia 5.5" long with a 22mm central flue. It has two bushes at the top and two in the side.

      I have a Sievert Cyclone 3524 burner (3KW) and have CupAlloy 455 silver solder (low temp)

      From what I have read I should do a two step braze. First the end caps and flue using a higher temp solder, then the bushes using a low temp solder.

      My questions are;

      Would a 3KW burner be hot enough to use a high temp solder?

      Would it be possible to solder the whole boiler using low temp solder? i,e, do the bottom, then the top and its two bushings, and finally the side bushes.

      Thanks

      Adrian

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      #10141
      AdrianR
      Participant
        @adrianr18614
        #460809
        Clive Brown 1
        Participant
          @clivebrown1

          IMO you will struggle for sufficient heat with your Sievert nozzle. To succeed you'll need very good insulation around the job. I see no reason why you couldn't try with 455 for the entire job to give a better chance of sucess.

          I think that I'd treat myself to a burner nozzle one or even two sizes larger.

          Clive

          #460810
          Former Member
          Participant
            @formermember19781

            [This posting has been removed]

            #460838
            Keith Hale
            Participant
              @keithhale68713

              Hi Adrian,

              A question I often ask, Why didn't you ask your supplier of equipment and silver solder?

              They are not a company that simply takes your money and leave you to get on with it. You can draw on the 100+ years of collective experience to help.

              A couple of years or so ago, they were demonstrating with the help of Western Steam, the building of a similar boiler at the Midlands exhibition.

              Who knows. As a customer, their technical support is included in the price of the silver solder.

              Regards

              Keith

              #460840
              Former Member
              Participant
                @formermember19781

                [This posting has been removed]

                #460850
                Keith Hale
                Participant
                  @keithhale68713

                  Hi Adrian,

                  And thanks to Bill.

                  With one eye on the Antiques Roadshow!

                  if you bought the torch kit from CuP, you already have a bigger burner generating 7kw of heat.

                  If you didn't, then you have a choice. Buy a bigger burner or improve your chances of success by insulating the joint better with an insulating blanket. Readily available from CuP.

                  No reason why you shouldn't be able to make all the joints with 455.

                  Regards

                  Keith

                  Declaration of interest – despite retiring 7 years ago, I'm still on their books!

                  #460857
                  Former Member
                  Participant
                    @formermember19781

                    [This posting has been removed]

                    #460864
                    Brian H
                    Participant
                      @brianh50089

                      As anyone who has tried to dismantle a silver soldered joint will know, it takes a lot more heat than it did to solder it in the first place.

                      If you're careful with the sequence of assembly and the amount of heat used on joints already made, it is easily possible to make a small boiler using only one grade of silver solder such as one containing 55% silver.

                      CuP Alloys is an excellent place to start (usual denials)

                      Brian

                      #460892
                      AdrianR
                      Participant
                        @adrianr18614

                        Thanks for the advice.

                        Adrian

                        #460893
                        Former Member
                        Participant
                          @formermember19781

                          [This posting has been removed]

                          #460898
                          KWIL
                          Participant
                            @kwil

                            Bill,

                            Brian was merely pointing out that once a joint has been made, the reflow temperature is higher due to alloying. In this way it is possible to make joints one after the other using the same silver solder type. Not only applies to small boilers.

                            K

                            #460900
                            Brian H
                            Participant
                              @brianh50089

                              Thanks Kwil.

                              Brian

                              #460901
                              Former Member
                              Participant
                                @formermember19781

                                [This posting has been removed]

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