Search found 84 matches

by johngriffiths
Sat Jan 24, 2015 10:12 pm
Forum: Technical - Engines and Boilers
Topic: Design Error on Leak compound Edwards Air Pump?
Replies: 9
Views: 7608

Re: Design Error on Leak compound Edwards Air Pump?

Didn't intend to confuse, Mal; take out 'plate'. The rubber disc is between valve and valve plate. Rubber was also used in full size practice as were thin brass discs. On full size marine plant and the small machines we use temperature of feed water had/has a considerable effect on steam raising. Wa...
by johngriffiths
Fri Jan 23, 2015 5:22 pm
Forum: Technical - Engines and Boilers
Topic: Design Error on Leak compound Edwards Air Pump?
Replies: 9
Views: 7608

Re: Design Error on Leak compound Edwards Air Pump?

An Edwards air pump is single acting and the coned end of the piston descends into the coned bottom cover displacing the water at high velocity around the piston through ports cast in the cylinder wall. The water, having insufficient time to run back, is moved away to the valve plate which is below ...
by johngriffiths
Thu Dec 18, 2014 9:21 pm
Forum: Technical - non Engines and Boilers
Topic: The big brown truck just made a visit
Replies: 11
Views: 13326

Re: The big brown truck just made a visit

sounds like a disc grinder, also available in 4" (a Makita is a lovely machine for delicate work), 5" and 9" and larger if you are brave.:-)

JohnG
by johngriffiths
Thu Oct 23, 2014 1:50 pm
Forum: Technical - Engines and Boilers
Topic: steam exhaust silencer
Replies: 10
Views: 10590

Re: steam exhaust silencer

Shamrock has a silencer, water from any steam that condenses keeps the ash pan damp and the rest goes up the funnel to encourage the fire.

www.youtube.com/watch?v=WIzo8ciYR84

www.youtube.com/watch?v=o8h4wrlo8xw

JohnG
by johngriffiths
Fri Oct 17, 2014 5:15 pm
Forum: Technical - non Engines and Boilers
Topic: What kind of First Aid Kit do have on your launch?
Replies: 18
Views: 19554

Re: What kind of First Aid Kit do have on your launch?

Most used on my boat has been a non flamable freezing spray which has proved very good for taking the heat out of steam and hot surface burns. Also carried is a zinc based anti sceptic ointment for application to the occasional cut which is then covered with a very sticky plaster. Except for paracet...
by johngriffiths
Sun Aug 24, 2014 6:43 pm
Forum: General Steamboat stuff
Topic: Bottom prep advise on Steel Hulled Steamboat
Replies: 8
Views: 9594

Re: Bottom prep advise on Steel Hulled Steamboat

Do you have access to an ultrasonic thickness tester? They can help give an overall view of condition Corrosion is sometimes very localised on steel hulls. One boat owner I know resorts to using the heads of 6" wire nails as rivets to plug small holes whilst the larger are filled by inserting patche...
by johngriffiths
Sat Aug 16, 2014 8:12 am
Forum: Technical - non Engines and Boilers
Topic: Water hammer
Replies: 21
Views: 24400

Re: Water hammer

Are the pipe to nipple joints silver soldered?

JohnG
by johngriffiths
Thu Jul 24, 2014 2:13 pm
Forum: Technical - Engines and Boilers
Topic: A new ASME code boiler for a Steam Launch
Replies: 42
Views: 33725

Re: A new ASME code boiler for a Steam Launch

I agree with Ron, use a single ash pan door hole with a door that can be closed in stages to control draft and which allows you to get a decent sized shovel in to lift the ash out. A rake can then be used to clear the corners. Its a good idea to either let some condensate drip into the ash pan (if i...
by johngriffiths
Mon Jun 09, 2014 3:28 pm
Forum: Technical - Engines and Boilers
Topic: Where to get boiler washout plugs
Replies: 6
Views: 6545

Re: Where to get boiler washout plugs

Four new bronze plugs were made by Martyn Blackburn a couple of weeks ago for Shamrock to replace the old which were well chewed and may well have dated from 1927. Martyn made them a nice long taper with as large a square head as could be got from the stock and a pair of new keys were made for getti...
by johngriffiths
Tue Apr 22, 2014 9:38 pm
Forum: Technical - non Engines and Boilers
Topic: Water hammer
Replies: 21
Views: 24400

Re: Water hammer

I once encountered hammering on a Stuart 6a when compression on the HP raised the pressure sufficiently to lift the slide valve. The only other thing I can think of is condensate building up and being carried over, that will make things smack a bit.

John