Author Topic: New feed pump for the boat.  (Read 22080 times)

Offline steamer

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New feed pump for the boat.
« on: September 11, 2013, 03:05:29 AM »
I've been running a cross head driven feed and wet air pump on my launch engine.   Problem is at the speed my engine runs, 550 rpm...they are not very efficient.  This makes tending the boiler and engine a chore...at best.  Working on these pumps in a very cramped bilge is near impossible...I end up taking the whole pump system out, and working on it on the bench....problematic when you on the lake!...

So....A change I think is due

I watched some very nice running boats running this weekend, with no wet air pumps, running condensing...but just fine.  They are running with the exhaust from the condenser exiting under water.  This rig results in a fairly low vacuum...5-15 in Hg...max!....but it's very consistent...and doesn't require the power to run a wet air pump...and to boot...there is no pump maintenance.  This results in running the water your floating in into the boiler...but that isn't really that much of a problem around here..as the water isn't that hard.

Additionally, most of the boats are running Hypro pumps ....or ....one of Ray Habrouck's pumps..specifically the pump from #8 engine.
I have the drawings for this engine and pump...and it's very similar to the hypro pump...but smaller....still....It has 7 times the flow of my pump....which I can manage with a bypass valve or reduced stroke or both.

These pumps are usually belt driven off the propeller shaft....at reduced speed.  If I do this, I can ditch the bow tank, put a pair of battery bank in , add running lights and my spot light....and probably have a easier boat to maintain as the pump will be under the seat aft, which is much more accessible.

This will take a which but I'll post it here.
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Offline steamer

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Re: New feed pump for the boat.
« Reply #1 on: September 11, 2013, 03:10:15 AM »
Oh and I gain some floor space from the lack of pumps, and the associated plumbing...and I can ditch the hot well all together.

I also plan to add some more economizer to the boiler, put in new rings, and repitch the propeller UP to 16 x 20 from 16 x 18...which should drop the engine speed a bit...and reduce my steam consumption, which the economizer should result in a higher overall steam output underway...

With the hot well out of the way, I can build wood bunkers either side of the boiler.    All in all I think it's a good way to go.


Any thoughts out there?

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Online Jo

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Re: New feed pump for the boat.
« Reply #2 on: September 11, 2013, 08:32:39 AM »
 :pics:

We need a picture of your pump, (won't complain if you include a picture of the engine  8)) , some pictures of what other might have so that we have a better idea of the alternatives.

And then we will give you more ideas/opinions than you can shake a cat at  :lolb: If you are lucky the odd one might actually work  ;)

Jo
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Offline steamer

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Re: New feed pump for the boat.
« Reply #3 on: September 11, 2013, 10:47:22 AM »
Hypro Pump

http://www.paulbparts.com/sites/default/files/imagecache/product_full/sprayer-parts/piston-pumps-under-constructio/5330CXhyproPistonPump.jpg


Hasbrouck #8 engine with  pump
http://i1.ytimg.com/vi/AzhxjrZczdU/hqdefault.jpg
You will notice that it is timing belt driven off the crank...Additionally, the crank has 4 repositionable crank pin positions resulting in 4 different flow rates.

No real photo of the pumps specifically in my boat....in the photo below, the pumps are just to the right and below the white bucket with the Charcoal in it at below deck level...additionally, the green bucket above...which is the hot well would also go away....and my bunkers could then go either side of the boiler....which would open up space for the port side aft passenger.


Dave
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Offline steamer

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Re: New feed pump for the boat.
« Reply #4 on: September 11, 2013, 10:51:14 AM »
And actually, I think the pump could go right underneath the output shaft before the hanger bearing and the brass guard....nice and neat.

Dave
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Offline steamer

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Re: New feed pump for the boat.
« Reply #5 on: September 11, 2013, 11:28:00 AM »
Looking for installation pictures of the Hypro pumps...but can't find any at the moment....but...they are all usually driven off the crank or engine with either a chain or a timing belt....like the Hasbrouck photo.   The hypro's are vertically disposed twin opposing pistons driven off a central crank with integral check valves.   They are very robust...and a bit pricey....

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Offline steamer

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Re: New feed pump for the boat.
« Reply #6 on: September 19, 2013, 11:57:43 AM »
OK....got the brass for the feed pump yesterday....1 x 2 x 12"....more than enough.

I'm going to build the Hasbrouck #8 pump.....perhaps with a modified base to mount to my boat as compared to a #8 engine...additionally, I'll be using "shuttles" instead of brass or stainless balls for the check valves....but 95% to print.

Dave
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Offline Tennessee Whiskey

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Re: New feed pump for the boat.
« Reply #7 on: September 19, 2013, 12:27:28 PM »
I bet that is a pretty piece of bar stock. I'd have to polish it up and look at it for awhile before I could start cutting on it ;)

Whiskey

Offline gbritnell

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Re: New feed pump for the boat.
« Reply #8 on: September 19, 2013, 12:42:05 PM »
Hi Dave,
This will be something a little different. I'll keep an eye on it. What may I ask are shuttle valves?
gbritnell
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Offline steamer

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Re: New feed pump for the boat.
« Reply #9 on: September 19, 2013, 01:54:04 PM »
George,

I know Jo posted a picture of a spool check valve a few days ago...but can't find it at the moment.

It is a round T shaped plug with scalloped sides and a O ring to seal against.  This replaces a Ball check valve.

They are very reliable.

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline Pete49

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Re: New feed pump for the boat.
« Reply #10 on: September 20, 2013, 04:15:16 AM »
aaaaarh batten the mainsail and raise the bilges matey and prepare to be boarded and walk the plank.....
ok my bit done and dusted.
Now my question, if I may, is about your engine and ancillaries. Do the owners of some of the said vessels make their own engines and boilers or must they be purchased from a manufacturer? The reason I ask is that I see the steam engines on this site built to very high standards and wonder if it is allowed by various authorities.
Pete
I used to have a friend.....but the rope broke and he ran away :(

Offline steamer

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Re: New feed pump for the boat.
« Reply #11 on: September 20, 2013, 08:18:15 AM »
Oh definitely built by owners.....for the most part....others bought....the "Manufactured" ones aren't necessarily better....it has been found.

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

fcheslop

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Re: New feed pump for the boat.
« Reply #12 on: September 20, 2013, 10:42:45 AM »
Hi Dave, The pic was in the Boiler feed pump Mr SShire recently did.I think
That is one sweet boat . Is the boiler along the lines of the Blackstaff as in Modern Steam Launches book.
The SBA in the UK has a load of very good info and Selway Fisher do some nice drawings I built the Felix some time ago
cheers

Offline steamer

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Re: New feed pump for the boat.
« Reply #13 on: September 20, 2013, 10:52:51 AM »
The PMR pump is very similar...but Ray's is a Bar stock build and was originally designed to go on the #8 engine.    I could have done the PMR and engineered the drive...but I want a bit of Ray on board!
 
I  have a plan set from Selway Fisher for the Indian runner...but didn't build that....when I lofted it, I just didn't like it......I am glad I did the Panatella ....although 6" wider and with a bit different narrower fantail on her....she's nearly double ended!....and is quite fast on the water.

The boiler is very "Blackstaffe"....as well as the engine...though I have  piston valves on mine.

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

fcheslop

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Re: New feed pump for the boat.
« Reply #14 on: September 20, 2013, 11:10:45 AM »
Thanks Dave, I keep looking at the boat pics and its becoming sooo tempting.
I have the Selway Fisher Explorer canoe plans and keep thinking a nice little 2inch bore and stroke would just fit in nicely :lolb: with a flash steam generator.
I have been looking for some Torpedo Launch drawings to build a scale model do you know of any boat yards that supply them.
Many thanks

Offline steamer

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Re: New feed pump for the boat.
« Reply #15 on: September 20, 2013, 11:24:15 AM »
Thanks Dave, I keep looking at the boat pics and its becoming sooo tempting.
I have the Selway Fisher Explorer canoe plans and keep thinking a nice little 2inch bore and stroke would just fit in nicely :lolb: with a flash steam generator.
I have been looking for some Torpedo Launch drawings to build a scale model do you know of any boat yards that supply them.
Many thanks

I thought Selway had one there a while back....but I guess not.

I believe there is a lines drawing for a double ender in Dick Mitchells book.

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Offline steamer

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Re: New feed pump for the boat.
« Reply #16 on: September 20, 2013, 11:32:40 AM »
OK   A number 8 running with pump.


Dave
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Offline steamer

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Re: New feed pump for the boat.
« Reply #17 on: September 20, 2013, 01:44:17 PM »



Hi Dave,
This will be something a little different. I'll keep an eye on it. What may I ask are shuttle valves?
gbritnell

George,

Look here

http://www.modelenginemaker.com/index.php/topic,2384.msg39650.html#msg39650

Post #9

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Offline Pete49

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Re: New feed pump for the boat.
« Reply #18 on: September 20, 2013, 03:37:00 PM »
Thanks Dave. now for the next question. Does one scale up a model engine or buy plans for the correct size motor. I know I'm trying to find out what I can and hope not becoming annoying. I have seen a few steam launches and have always wondered about the engines and how they are acquired. I know you can/could buy a steam engine and boiler setup here in Sth Oz as a guy bought one for his property on Kangaroo Island for powering his generator for his off grid house. 
Pete
I used to have a friend.....but the rope broke and he ran away :(

Offline steamer

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Re: New feed pump for the boat.
« Reply #19 on: September 20, 2013, 04:17:10 PM »
Hey Pete,

I designed and made patterns for my engine, so .... :shrug:

You could buy one of several casting kits out there....with plans.....some are better than others....

Dave

"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Offline steamer

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Re: New feed pump for the boat.
« Reply #20 on: September 20, 2013, 05:56:40 PM »
An ideal source of plans are Ray's

http://hasbrouck.8m.com/index.htm

Tiny Engines through a boat yard who's name slips my mind supplies finished engines

There is a builder of engines in Austrailia.....but I'll get names and addresses later.

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Offline ths

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Re: New feed pump for the boat.
« Reply #21 on: September 20, 2013, 10:19:24 PM »

Offline steamer

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Re: New feed pump for the boat.
« Reply #22 on: September 20, 2013, 11:37:14 PM »
Yup.......that's the one.


Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Offline Pete49

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Re: New feed pump for the boat.
« Reply #23 on: September 21, 2013, 04:26:21 AM »
Yep that's the one I mentioned but the name escaped me. :facepalm2:. One of the things that has always amazed me is the power of steam. An example is the oft seen traction engine and the work they could do with what is essentially a small steam engine with a large boiler on wheels.
Pete
I used to have a friend.....but the rope broke and he ran away :(

Offline steamer

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Re: New feed pump for the boat.
« Reply #24 on: September 21, 2013, 12:17:05 PM »
Yep that's the one I mentioned but the name escaped me. :facepalm2:. One of the things that has always amazed me is the power of steam. An example is the oft seen traction engine and the work they could do with what is essentially a small steam engine with a large boiler on wheels.
Pete

Yes I am very much aware! 8)





Because man created boats to keep his engines dry..... :LittleDevil:
« Last Edit: September 21, 2013, 12:29:05 PM by steamer »
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Offline steamer

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Re: New feed pump for the boat.
« Reply #25 on: September 21, 2013, 03:41:08 PM »
Hmmmmmmm Brass!



I get all excited over brass!

Dave

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Offline Dave Otto

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Re: New feed pump for the boat.
« Reply #26 on: September 21, 2013, 04:17:51 PM »
That represents a fair amount of pocket change.

Dave

Offline steamer

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Re: New feed pump for the boat.
« Reply #27 on: September 21, 2013, 06:45:16 PM »
 1 x 2 x 12......Yes it does....I need a 1/3 of that for the pump...but It'll get used.

Dave
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Offline Don1966

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Re: New feed pump for the boat.
« Reply #28 on: September 21, 2013, 07:34:30 PM »
Yea Dave, that is a chunk of brass, very expensive and you know how much I like brass. Have fun buddy.

Don

Offline steamer

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Re: New feed pump for the boat.
« Reply #29 on: September 22, 2013, 03:08:56 AM »
I squared up a piece of brass tonight for the pump body.   I am in the throws of making the gear cover. so once I finish the vise work on the Wallaby gear cover, I'll do the machining of the pump body before I take the vise off and put the rotary table on.



Here's what the existing pumps look like.


The feed pump is on the right, and the wet air pump on the left.  They are driven by levers connected to the LP crosshead.




The problem is the speed of the pumps is very fast...at 550 strokes/minute ....so the feed pump is not very efficient...A slower pump will work better.

I may re-use some of the valves.

Dave
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Offline steamer

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Re: New feed pump for the boat.
« Reply #30 on: September 29, 2013, 02:42:24 AM »
I got the pump body done today.   It's a simple part, machined to Ray's specs.   The bore is recommended to be lapped...which is what I did.   I reamed it first, but to improve the finish, I machined a wood lap, machined from a piece of my broom handle... covered it with Simichrome, and had at it, turning the part end for end as I went.   Cleaned up nice.

I then made the oil cup, and the valve box....at which point I stuffed it!...so I'll make a new valve box in the morning....







Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Offline Don1966

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Re: New feed pump for the boat.
« Reply #31 on: September 29, 2013, 03:43:08 AM »
Look good to me Dave, keep it coming.

Don

Offline steamer

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Re: New feed pump for the boat.
« Reply #32 on: September 29, 2013, 01:37:11 PM »
Thanks Don!....got some honeydo's to do today...but hopefully this afternoon, I can run into the shop for a while.
The new magnifier worked a treat while undercutting the 8-32 screw at the shoulder on the oil cup.    :whoohoo:
Additionally, I need to some new boring bars to go with my boring heads...everything I have fits the old head on "Norm"

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Offline steamer

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Re: New feed pump for the boat.
« Reply #33 on: September 29, 2013, 03:52:17 PM »
Got boring bars!.......

Dave
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Offline Mosey

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Re: New feed pump for the boat.
« Reply #34 on: September 29, 2013, 04:17:22 PM »
I'm speechless in admiration of your rig.
Come to think..everyone needs a boat so they can need a steam engine.
Mosey

Offline b.lindsey

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Re: New feed pump for the boat.
« Reply #35 on: September 29, 2013, 05:59:21 PM »
That bore looks very smooth Dave!!  Does the simichrome have some mild abrasive properties to it?

Bill

Offline Don1966

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Re: New feed pump for the boat.
« Reply #36 on: September 29, 2013, 06:19:16 PM »
Dave check you PM.

DON

Offline steamer

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Re: New feed pump for the boat.
« Reply #37 on: September 29, 2013, 06:23:48 PM »
That bore looks very smooth Dave!!  Does the simichrome have some mild abrasive properties to it?

Bill

Yes...it's like a very fine buffing compound.  Good for fine polishing....though I just wanted to get rid of the worst of the tool marks.

Dave
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Offline ths

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Re: New feed pump for the boat.
« Reply #38 on: September 29, 2013, 09:51:34 PM »
Looking good, Dave. Just wondering how the brass will stand up to the rigours of constant work. I know we all use it for cylinders, but many of our things are rarely, or only lightly, in action. A good summer for you could see a fair bit of wear potential. You must be using o-rings to minimise friction.

Cheers, Hugh.

Offline steamer

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Re: New feed pump for the boat.
« Reply #39 on: September 30, 2013, 12:18:36 AM »
Hey Hugh,

It uses an O-ring in the piston.   This pump was designed by Ray, and there are many of them in operation in the real world..so I have faith

Here's the state of play.

I finished the valve body tonight....made the second one faster than the first.   That would be the one on the right.



On top is a valve shuttle.   It fits well.    Ray calls for hex plugs to cap the valve body with seal washers.   I co-bored mine for O-ring seals like an SAE fitting.

Here is the  mock up of parts so far....I need to get bolts long enough....but I'm gaining on it.



The valve spools seat and seal nicely!....I need to engineer a hex plugs to limit the valve lift.   The outlet is 1/4 NPT.


Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline Don1966

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Re: New feed pump for the boat.
« Reply #40 on: September 30, 2013, 12:32:39 AM »
Nice it of work Dave, works a treat for me.

Don

Offline steamer

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Re: New feed pump for the boat.
« Reply #41 on: September 30, 2013, 12:39:16 AM »
I'm speechless in admiration of your rig.
Come to think..everyone needs a boat so they can need a steam engine.
Mosey

Thanks Mosey!

Man created boats to keep his engines dry!.....

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline Jim K 324

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Re: New feed pump for the boat.
« Reply #42 on: September 30, 2013, 12:54:51 AM »



                Nice piece of work Dave ,where we live in south Louisiana every body has  a boat in the
                yard jsut in case the water gets too high in the Atchafalaya river.  :ThumbsUp:

                     Jim
It's not what you make,It's how you make it that
matters !!

Offline steamer

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Re: New feed pump for the boat.
« Reply #43 on: September 30, 2013, 01:21:52 AM »
Thanks Jim,

This pump will be run at about 1/3 of the engine speed...or about 450/3 or 150 strokes/minute at full song....I intend to repitch the prop to 16x20 from 16x18...so I'm hoping to get the engine speed down to 450 from 550.   Use less steam.

The stroke is selectable from 1.625 to 2.000...IIRC.   The crank disk has 4 holes in it to reposition the crank pin there buy changing the delivery volume.

I'll need about 100 pounds an hour minimum.

At 150 strokes per minute and 80% efficiency, at 2.00 inches per stroke, I'll be delivering about 106 cubic inches per minute.  That's 0.45 gallons/minute or about 27 gallons per hour or about 212 pounds per hour.....More than enough!....If I reduce the stroke to 1.625, I'll get 1.625/2.00 x 212 = 172 pounds per hour.    The excess is will be released via my bypass valve which is shown here on the right with the black knob.
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Offline swilliams

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Re: New feed pump for the boat.
« Reply #44 on: September 30, 2013, 01:47:57 AM »
cool Dave, love your earlier pic of the whole power plant.

Steve

Offline steamer

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Re: New feed pump for the boat.
« Reply #45 on: September 30, 2013, 02:59:47 AM »
Thanks Steve!

I've got work to do on the boat!....lot's of changes.     The feed tank is coming out, and in it's place a pair of batteries.  Then some running lights, and I get to mount this little beauty where the bow tank deck fill fitting is.



"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline Don1966

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Re: New feed pump for the boat.
« Reply #46 on: October 03, 2013, 02:06:45 AM »
Hi Dave I like your spot light. It's a must around here since we do have a lot of swamps. When you change the power cord see if you have glass sleeving on the wires that connect to the lamp. If it doesn't let me know and I will send you some. The glass sleeving helps keep the insulation on the wire. These lamps generator a lot of heat. Happy boating my friend.

Don

Offline Alan Haisley

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Re: New feed pump for the boat.
« Reply #47 on: October 03, 2013, 06:47:01 PM »
Dave,
I've got an iggorant question for you (and others): What the heck is "wet air", where does it come from, where do you want it to go, and what will it do when it gets there?
I'm one of those poor, unenlightened, souls who has never seen a real steam engine, never talked with a real engineer about one, and just learn what I can by reading.
Alan
Near Raleigh, NC, USA

Offline steamer

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Re: New feed pump for the boat.
« Reply #48 on: October 03, 2013, 08:58:46 PM »
Aren't these names just wonderful? :lolb:

Wet Air Pump

OK what is Wet Air.    Wet Air is the air and condensate coming out of the condenser.   Its wet because its mixed with the condensed steam...( water)....hence the name....

So

A Wet Air Pump takes the water and air from the condenser and assists in keeping a vacuum..  It delivers the mix  to a Hot well.  A hot well is a open tank which the wet air  the mix is deposited...and hopefully if done correctly, the water temperature is above 160F which will drive off the entrained oxygen   The boiler feed pump then takes that de arated water and pumps it back into the boiler
Dave
« Last Edit: October 05, 2013, 03:09:22 PM by steamer »
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Offline steamer

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Re: New feed pump for the boat.
« Reply #49 on: October 03, 2013, 08:59:50 PM »
Hi Dave I like your spot light. It's a must around here since we do have a lot of swamps. When you change the power cord see if you have glass sleeving on the wires that connect to the lamp. If it doesn't let me know and I will send you some. The glass sleeving helps keep the insulation on the wire. These lamps generator a lot of heat. Happy boating my friend.

Don

Hey Don,

I am seriously considering changing this one over to an LED high intensity....but will keep your offer in mind!

Thanks Bud!

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Offline steamer

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Re: New feed pump for the boat.
« Reply #50 on: October 05, 2013, 08:51:07 PM »
Got the orings and the bolts I needed.    Ill get some more done today.....but im at the track with the kids.
Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline steamer

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Re: New feed pump for the boat.
« Reply #51 on: October 07, 2013, 12:08:36 AM »
Ok got the valve keepers done, and mounted along with the shuttle valves..and hardware....there is a adapter plug I need to make that goes between the two.   but it seems to be coming together.





Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Offline Kim

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Re: New feed pump for the boat.
« Reply #52 on: October 07, 2013, 04:00:19 AM »
Looks good Dave!
Those are some nice sized hunks of brass you've used here!
Kim

Offline steamer

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Re: New feed pump for the boat.
« Reply #53 on: October 07, 2013, 10:56:23 AM »
Aren't they!....I've only changed the form of the valves inside.   the rest is exactly as Ray drew it.   Next up is the plug adapter and the piston, and the water side parts will be done.


Dave   
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline steamer

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Re: New feed pump for the boat.
« Reply #54 on: October 08, 2013, 04:29:19 PM »
Oh and I didn't have a 1/2-20 die for the valve keepers...so I had to single point them to the shoulder where there is a .07 O-ring groove.   Now normally, that would require some "puckering" and back gear and to be quick on the reverse...but not so on Samantha with the VFD...I could crawl to the corner and back away quickly ...no worries......Love that VFD!

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline steamer

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Re: New feed pump for the boat.
« Reply #55 on: October 09, 2013, 03:28:56 AM »
Well I got the body of the plunger turned to size.   I had a piece of old prop shaft....Nasty stuff...It turned with some coaxing....

I still need to cut it to length and cut the O ring groove...but it pumps water!....so I'm doing something right.

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline steamer

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Re: New feed pump for the boat.
« Reply #56 on: October 21, 2013, 11:52:37 PM »
Not a lot happened this past weekend....spent some time setting up Solidworks on my home PC.  My son loves it, and is working on it. :ThumbsUp:.....better than most of the video games....

I got the pump plunger to progress a bit though.   It still needs the slot and hole cut for the wrist pin though.

I need to lay in the existing engine mounts so I can modify the base plate to fit my application, though first I want it to reliably pump to 400 psi.    Then I'll be confident this will be the pump for the boat.

Dave

"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline b.lindsey

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Re: New feed pump for the boat.
« Reply #57 on: October 22, 2013, 02:04:44 AM »
You are making some good progress Dave. It's looking really good too.
Bill

Offline tel

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Re: New feed pump for the boat.
« Reply #58 on: October 22, 2013, 09:05:37 AM »
Quote
I want it to reliably pump to 400 psi.    Then I'll be confident this will be the pump for the boat.

Don't think you will have any problem on that score Dave, these type of pumps can produce scarily high pressures.
The older I get, the better I was.
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Offline steamer

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Re: New feed pump for the boat.
« Reply #59 on: October 22, 2013, 10:02:52 AM »
Good!....I need about 200 consistently.   Max steam pressure is 160 psi...but with the feedwater heater, and the economizer....there is some pressure loss. 
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline steamer

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Re: New feed pump for the boat.
« Reply #60 on: September 15, 2014, 06:11:04 PM »
Well hello all,

Spent some time up at Lee's Mills and got some of my steamboat fix going.      I'm going to get into some more work on this pump, and perhaps a few other things as well.....as time allows.

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Online Jo

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Re: New feed pump for the boat.
« Reply #61 on: September 15, 2014, 06:21:15 PM »
and perhaps a few other things as well.....as time allows.

 :naughty: not a certain engine that I was tempted to pick up a set of bronze :Love: castings for.

Jo
Enjoyment is more important than achievement.

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Re: New feed pump for the boat.
« Reply #62 on: September 15, 2014, 06:44:54 PM »
If a bronze engine is what you have in mind....wait till I post some pictures of one I saw this past weekend..... :o


In a word......Elegant!

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Offline steamer

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Re: New feed pump for the boat.
« Reply #63 on: September 17, 2014, 12:54:13 AM »
I'm going far simpler as to pumps, and running it all at reduced speed off the prop shaft with a timing belt.    The pumps will go under the aft bench, out of the footwell.   I will be removing the hot well, and dump my condensate overboard.   Need the foot space.     I have a pump layout that I think is easy to build, easy to service and has a modicum of efficiency.

More to come

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline Admiral_dk

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Re: New feed pump for the boat.
« Reply #64 on: September 17, 2014, 08:43:06 PM »
I saw a few steam launches in Scotland in 2012 and they all had about a meter of tube outside the hull and under water, and that was the condenser - very simple and efficient. I have a few pictures of the very beautify boats, but unfortunately not with much technical details.

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Re: New feed pump for the boat.
« Reply #65 on: September 19, 2014, 12:07:29 PM »
I'm going far simpler as to pumps, and running it all at reduced speed off the prop shaft with a timing belt.    The pumps will go under the aft bench, out of the footwell.   I will be removing the hot well, and dump my condensate overboard.   Need the foot space.     I have a pump layout that I think is easy to build, easy to service and has a modicum of efficiency.

More to come

Dave

Dave,
On reading your post on a boiler feed pump I thought that this would be of interest.

Some years ago I built a steam plant with a single cylinder double acting engine using a Stuart 5A casting only with the other parts built from stock.
Boiler was a Yarrow type with 50 down tubes each side and fired by a gas burner.

The engine driven feed pump is of the ball valve type, 1- for suction and 1- for delivery driven via an eccentric on the main shaft with a bleed valve to adjust delivery to the boiler, it also had a hand operated feed pump mounted on the engine bed plate, all very simple and effective.

The eccentric pump was 1/2bore x 1" stroke and delivered too much water to the boiler ,hence the by pass valve.

The plant was to go into a Canadian 4- man canoe until I discovered the weight of one and abandoned the idea as it was far to heavy for this old guy to handle, I had visions of cruising on Loch Lomond about 1/2 hr from me or cruising along the Forth and Clyde canal that runs thro' my town, one lived on dreams.

Here are some pics of the unit for your perusal.

George.

P.S. The engine had so much power it would break your arm trying to stop it at 80 p.s.i.
« Last Edit: September 19, 2014, 12:10:31 PM by K.B.C »
Your never too old to learn.

Offline steamer

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Re: New feed pump for the boat.
« Reply #66 on: September 19, 2014, 12:19:58 PM »
Yup....gotta love steam!....over 2 HP from mine..   ( 1.5 x 3.0 x 2.5 compound @ 160 psig)

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline steamer

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Re: New feed pump for the boat.
« Reply #67 on: October 22, 2014, 01:11:18 AM »
The leaves are changing....and I'll be in the shop more I think.   The indoor racing season is coming now...but I think the Losi will be far less maintenance....at least that's what I'm counting on.

That means back at some projects that have been ......hmmmm     lingering doesn't seem strong enough a word......

In any case

I've been doodling a wet air pump as well and I think I can make a side by side pair of pumps to the same design driven by the same belt.   If I time the wet air pump 180 out of phase to the feed pump the load will not increase at all, and I'll have an even power load.    Just might work.   I'll lay it all out and let you guys see what I'm getting on about.

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Offline b.lindsey

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Re: New feed pump for the boat.
« Reply #68 on: October 22, 2014, 01:20:04 AM »
More shop time?? What is that? lol.  I feel your pain Dave, but the racing circuit (even if local) has been a wild ride for all of us following your and William's adventures. Even so, making some metal chips will be great! :)

Looking forward to seeing what you have in mind on the pump.

Bill