Hose tail sizes ?

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Boo2

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Hi,

I just put an order in at a well know supplier of boat parts like skin fittings etc. Order was for 2m of 51mm fuel hose + a 2" bsp 90 degree elbow + 2" bsp hose tail, all required to connect up my fuel tank to the deck filler. I naively expected this to all work together but the hose tail only measures 48mm outside the hose "spurs" not the 51mm that I expected from a metric 2" nominal tail. As a result it's way too small to seal on the hose and I am stuck.

Have I done something wrong in terms of ordering bits ? What do I need to do to connect 51mm fuel hose to a 2" BSP elbow ?

I am obviously in contact with the supplier to try to resolve the issue but in the interim has anyone any advice or suggestions ?

<Edit>The supplier has kindly agreed to send another hose tail that they think will better fit the hose I ordered so it does seem as if different makes / types have different fits. Is this just a case of 50mm <> 2" does anyone think ? Still be good to know how to avoid the issue ... </Edit>

Thanks,

Boo2
 
Last edited:
Boo2 said:
Hi,

I just put an order in at a well know supplier of boat parts like skin fittings etc. Order was for 2m of 51mm fuel hose + a 2" bsp 90 degree elbow + 2" bsp hose tail, all required to connect up my fuel tank to the deck filler. I naively expected this to all work together but the hose tail only measures 48mm outside the hose "spurs" not the 51mm that I expected from a metric 2" nominal tail. As a result it's way too small to seal on the hose and I am stuck.

Have I done something wrong in terms of ordering bits ? What do I need to do to connect 51mm fuel hose to a 2" BSP elbow ?

I am obviously in contact with the supplier to try to resolve the issue but in the interim has anyone any advice or suggestions ?

<Edit>The supplier has kindly agreed to send another hose tail that they think will better fit the hose I ordered so it does seem as if different makes / types have different fits. Is this just a case of 50mm <> 2" does anyone think ? Still be good to know how to avoid the issue ... </Edit>

Thanks,

Boo2
Click to expand...


BSP is the thread size (British Std Pipe) even the foreigners use it.
3/4 BSP is a 1/2" bore
1"BSP is 3/4" bore ect
some BSP threads are straight often with Iron heating pipe & fittings is is a tapered thread
http://en.wikipedia.org/wiki/British_Standard_Pipe

so you really need the bore sizes similar & possibly the hose slightly smaller to be able to heat it for a tight fit
 
Last edited:
Boo2 said:
Order was for 2m of 51mm fuel hose + a 2" bsp 90 degree elbow + 2" bsp hose tail, all required to connect up my fuel tank to the deck filler. I naively expected this to all work together
Click to expand...

Naively is the word :)

You've specified a 2" BSP thread on your hose tail (which, you should note, is a size number and not an actual dimension you will find anywhere on the fitting, though it should be close to the internal diameter). You have not specified the size of the hose barb on the other side.

If it was ASAP you bought from, you might have noticed that for each thread size they offer two or three different hose sizes, demonstrating that they are separate things to consider.

Pete
 
David2452 said:
Simple really what you needed was a 2" BSP to 51mm hose tail which should be perfect, ASAP and many others have them on the shelf.
Click to expand...

...and they also have lots of other sizes:

45mm - http://www.asap-supplies.com/marine...-tails/brass-male-hose-tail-connection-404082
51mm - http://www.asap-supplies.com/marine...-tails/brass-male-hose-tail-connection-404084
55mm - http://www.asap-supplies.com/marine...-tails/brass-male-hose-tail-connection-404086
60mm - http://www.asap-supplies.com/marine...ht-male-bsp-hose-tail-fitting-cr-brass-435088
61mm - http://www.asap-supplies.com/marine...bsp-male-straight-hose-tail-connection-404688
64mm - http://www.asap-supplies.com/marine...bsp-male-straight-hose-tail-connection-404691

Presumably the OP only looked at the thread size, and picked a hose size at random. I can imagine that a barb for 45mm hose might be 48mm over the tops of the ridges, so I guess he bought the first one?

Pete
 
sailorman said:
BSP is the thread size (British Std Pipe) even the foreigners use it.
3/4 BSP is a 1/2" bore
1"BSP is 3/4" bore ect
some BSP threads are straight often with Iron heating pipe & fittings is is a tapered thread
http://en.wikipedia.org/wiki/British_Standard_Pipe

so you really need the bore sizes similar & possibly the hose slightly smaller to be able to heat it for a tight fit
Click to expand...

The BSP thread size is actually the nominlal bore of the pipe on which it is normally cut.

The OD of 3/4" pipe is 11/16"

The actual bore of the piece I have in my hand is just over 13/16"

1" pipe has an OD of 13/8"
 
VicS said:
The BSP thread size is actually the nominlal bore of the pipe on which it is normally cut.
Click to expand...

Indeed - but most of the time you don't need to worry about this, just match the thread sizes. This is exactly what the OP has done - his 2" BSP elbow and 2" BSP hose tail will screw together nicely, and fit into a 2" BSP fitting on the tank, or a ball valve with 2" BSP threads, or whatever. The thread size is a red herring here - the problem is that he forgot to make sure he was buying the right size hose barb.

Pete
 
I am still trying to identify the hose size on my Jeanneau to avoid Falling in the same trap as Boo2. Its a Jeanneau 43 DS

There are 4 corregated plastic pipes with an O/D of 24mm that go to a 3/4" BSP tail etc I suspect its 19mm I/D. These do the heads water in and pumped showers out.

There are 2 heads gravity sink drains that go to a 1" BSP tail. I can see a bit of the sink outlet and it measures 21mm O/D and the corregated plastic pipes O/D is 30mm. I could order a tail for a 21mm I/D pipe but wonder if the sink outlet is bigger where it is buried in the pipe and the pipe I/D is 25mm.

Heads out is easy as pipe is marked 38.1 I/D.

If no one can suggest correct I/D s I may accurtately measure the two Corregated dims and look for the equivalent pipe in the chandlery. I have asked Jeanneau but don't expect an answer for a week or so.

Any suggestions?
 
prv said:
Why don't you just pull them off the barbs and measure them? Close the valves first if in the water, obviously :)

Pete
Click to expand...

Am replacing them due to risk of corrosion. Boat has bookings up till it comes out end of Feb. If I pull one off something is bound to break! The connections are all 9yrs old and some jubilee clips don't look too healthy. I just think that if I try to pull one off I will end up needing new jubilee clips then tail breaks etc etc.

Trying to find out diameters in any non destructive way. Would prefer to order all correct fittings in advance but if necessary will wait until boat out of water for final check on hose size but will have bought what I think will be correct.

Regular charter company boat maintenance man says he always gets it wrong and always waits until boat out of water then removes fitting and takes them to local supplier for a match
 
Sailfree said:
Am replacing them due to risk of corrosion. Boat has bookings up till it comes out end of Feb. If I pull one off something is bound to break! The connections are all 9yrs old and some jubilee clips don't look too healthy. I just think that if I try to pull one off I will end up needing new jubilee clips then tail breaks etc etc.

Trying to find out diameters in any non destructive way. Would prefer to order all correct fittings in advance but if necessary will wait until boat out of water for final check on hose size but will have bought what I think will be correct.

Regular charter company boat maintenance man says he always gets it wrong and always waits until boat out of water then removes fitting and takes them to local supplier for a match
Click to expand...
As she is chartered isnt she coded & therefore surveyed each year
 
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