Welcome to the UK Window Cleaning Forums

Starting or own a window cleaning business? We're a network of window cleaners sharing advice, tips & experience. Rounds for sale & more. Join us today!

1 Inch BSP Outlet Fitting

BESKAN Ben

New member
Messages
11
Location
Wakefield
Evening Guys

Sorry for sounding extremely thick here but I have just bought a 400 Litre tank which has a  1 inch BSP outlet fitting. Where do I get this fitting from so that I can attach to a hose to the pump? I just keep seeing the 3/4 inch ones. Any links or pointers in the right direction would be greatly appreciated. Cheers ?

 
Evening Guys

Sorry for sounding extremely thick here but I have just bought a 400 Litre tank which has a  1 inch BSP outlet fitting. Where do I get this fitting from so that I can attach to a hose to the pump? I just keep seeing the 3/4 inch ones. Any links or pointers in the right direction would be greatly appreciated. Cheers ?
You need a reducer try a plumbing or pump specialist 

 
Evening Guys

Sorry for sounding extremely thick here but I have just bought a 400 Litre tank which has a  1 inch BSP outlet fitting. Where do I get this fitting from so that I can attach to a hose to the pump? I just keep seeing the 3/4 inch ones. Any links or pointers in the right direction would be greatly appreciated. Cheers ?
get your outlet bush from Toolstation.

Then run 3/4" elbow to a hose barb tail 

https://www.toolstation.com/brass-hexagon-bush/p42593

 
It has to be a BSP thread if it’s tapered will crack the internal thread. We do a range but if you are looking for BSP reducer Screwfix do one but be careful I was supplied with a tapered one https://www.daqua.co.uk/baffled_upright_tanks.htm
Yes it is worth making sure the female reducer is parallel thread. Try it on a male thread both ways. You won’t have any problems however putting a tapered male (BSPT) in a parallel female (BSPP). 

 
Yes it is worth making sure the female reducer is parallel thread. Try it on a male thread both ways. You won’t have any problems however putting a tapered male (BSPT) in a parallel female (BSPP). 
The tank thread is BSP and big warning sign on tank NOT TO USE BSPT. If it was BSPP no problems.

The issue you will find using a BSPT it may not crack the thread first time but during time you will start seeing a leak which quite a few people unfortunately have found out.

 
The tank thread is BSP and big warning sign on tank NOT TO USE BSPT. If it was BSPP no problems.

The issue you will find using a BSPT it may not crack the thread first time but during time you will start seeing a leak which quite a few people unfortunately have found out.
The o/d of any BSPT male fitting is always very fractionally smaller than its BSP P male equipment. So don’t think it’s a size issue  more like a sealing issue. . 

 
The o/d of any BSPT male fitting is always very fractionally smaller than its BSP P male equipment. So don’t think it’s a size issue  more like a sealing issue. . 
If you screw in a BSPTM into BSPF it will not go in fully as the tread at the back is slightly higher than the front. With tapered the thread is at a slight uphill angle. BSP thread is straight. The thread on the tank is think metal so that is why it cracks

 
If you screw in a BSPTM into BSPF it will not go in fully as the tread at the back is slightly higher than the front. With tapered the thread is at a slight uphill angle. BSP thread is straight. The thread on the tank is think metal so that is why it cracks
The thread at the back is higher than the front hence the taper but the max O/D of that thread is slightly smaller than the max o/d of a parallel fitting. The Angle of the thread is 60 degrees from memory the same as tapered or parallel. 

 
The tank thread is BSP and big warning sign on tank NOT TO USE BSPT. If it was BSPP no problems.

The issue you will find using a BSPT it may not crack the thread first time but during time you will start seeing a leak which quite a few people unfortunately have found out.
My Wyedale tank just says USE BSP FITTINGS.  Think this is just stating the type of thread. It dosent say NOT TO USE BSPT on any Wyedale tank I’ve seen. Are you sure it says that or have you misinterpreted  it??

 
My Wyedale tank just says USE BSP FITTINGS.  Think this is just stating the type of thread. It dosent say NOT TO USE BSPT on any Wyedale tank I’ve seen. Are you sure it says that or have you misinterpreted  it??
I think what Doug was saying that its easy to over tighten a BSPT fitting and crack the metal insert. BSP is the correct fitting also sometimes called a BSPP fitting to differentiate between parallel thread and taper thread.

Personally I haven't bought a Wydale tank in years so I don't know what the warning sticker says now. I remember it just saying BSP, but then I know the difference between BSPP and BSPT. Some windies may not.

I guess its like telling a McDonald's customer that the contents of his coffee cup are hot. Some may not realise this. ?

 
I think what Doug was saying that its easy to over tighten a BSPT fitting and crack the metal insert. BSP is the correct fitting also sometimes called a BSPP fitting to differentiate between parallel thread and taper thread.

Personally I haven't bought a Wydale tank in years so I don't know what the warning sticker says now. I remember it just saying BSP, but then I know the difference between BSPP and BSPT. Some windies may not.

I guess its like telling a McDonald's customer that the contents of his coffee cup are hot. Some may not realise this. ?
Yer but it’s not. No part of a tapered BSP male is bigger than its parallel equivalent. So over tightening wouldn’t crack anything bescause at its biggest widest diameter a tapered fitting is ever so slightly smaller than a parallel fitting. If a parallel fitting dosent crack it a taper fitting will DEFO not.  

 
If you screw in a BSPTM into BSPF it will not go in fully as the tread at the back is slightly higher than the front. With tapered the thread is at a slight uphill angle. BSP thread is straight. The thread on the tank is think metal so that is why it cracks
Perhaps this will help. The two columns on the left are the MAX o/d of a taper male BSP fitting. One in metric one in imperial. The MAX o/d of the thread or the last thread at the end which you think is bigger. It’s the MAX. The two columns on the right are the MAX o/d of a male BSPP (parallel) fitting. 
 

B7B824EA-9FB6-4806-9E6A-B11B7DF52E80.jpeg

 
Perhaps this will help. The two columns on the left are the MAX o/d of a taper male BSP fitting. One in metric one in imperial. The MAX o/d of the thread or the last thread at the end which you think is bigger. It’s the MAX. The two columns on the right are the MAX o/d of a male BSPP (parallel) fitting. 
 

View attachment 21579
I now understand what you are saying.

The peaks of the male thread will always remain parallel to the valleys of the female BSP thread.

What changes in a tapered thread is that the valleys of the thread get shallower. You can clearly see that if you look at the thread. You can screw a male parallel thread all the way home in a female thread. Use the same female thread with a tapered male thread and the male will start to tighten up the further you screw it in. You won't be able to screw it in as far you did with the parallel thread male fitting.

In the original design the concept was that a seal or gasket would be located at the end of the female thread on BSPP to seal the 2 joins. Tapered thread would seal the threads with the aid of a sealant to prevent leakage due to manufacturing imperfections.

When using a fitting into a water tank the correct fitting to use would be a tapered thread. But in the hands of an unskilled person they could overtighten the male fitting and crack the brass socket in the tank outlet. So the best advice to cover all bases is to only use BSPP fittings and seal the threads with PTFE tape or some other liquid sealer. Even winding too many wraps of PTFE tape can cause the female socket to crack if overtighened by someone who doesn't have the 'feel' to know how far to tighten it.

 
Last edited by a moderator:

Latest Posts

Back
Top