1/4" NPT thread vs 1/4" BSP
#1
1/4" NPT thread vs 1/4" BSP
Anyone know if it's a major difference.
I have gauges that are 1/4" Male BSP and I need them to temporarily check something, which maybe 1/4" NPT female plastic it's 1000miles away so I can't just go out and look. It maybe BSP, I don't know, all I know is it's 1/4".
But if it is NPT, if a BSP fitting can be bodged on there, then I won't need to but an adapter...it's only to quickly check pressure, 5mins tops, so doesn't matter if it leaks a little. It's plastic thread so it should "give" a little (or strip ).
I have gauges that are 1/4" Male BSP and I need them to temporarily check something, which maybe 1/4" NPT female plastic it's 1000miles away so I can't just go out and look. It maybe BSP, I don't know, all I know is it's 1/4".
But if it is NPT, if a BSP fitting can be bodged on there, then I won't need to but an adapter...it's only to quickly check pressure, 5mins tops, so doesn't matter if it leaks a little. It's plastic thread so it should "give" a little (or strip ).
Last edited by ALi-B; 04 May 2017 at 01:30 PM.
#3
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Topnof my head 1/4" NPT is 18 thread pitches per inch, and 1/4" BSP is 19 per inch. It would probably cut itself a new thread eventually but on a few pitches you'd probably get away with it. Could try some PTFE tape for a good seal?
#5
Scooby Regular
A couple of wraps of PTFE tape would help lubricate whilst you are screwing it in too.
#7
http://www.bombasymotores.es/WebRoot...E4/winner1.pdf
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#8
The test points are on the pump itself, its part of the pump housing (which you can see in the picture in the above link, part no.6 ); Technically they are drain points, so have a blanking plug, but they double up as test points to check pressure and vacuum. Nearly all pool pumps have this arrangement.
I have the parts listing which shows the blanking plugs but all it lists it as is 1/4" and no mention of thread type. Marvellous!
I have the parts listing which shows the blanking plugs but all it lists it as is 1/4" and no mention of thread type. Marvellous!
#9
if you've got the 1/4'' bsp gauges already, then get a couple of 1/4'' NPT gauges, if you crack the pump housing it's an expensive fix
http://www.ebay.co.uk/itm/Air-Compre...wAAOSwiONYLBJ4
http://www.ebay.co.uk/itm/Air-Compre...wAAOSwiONYLBJ4
#10
That looks cheap and nasty quality, wouldn't trust it to check tyre pressures
Pump is ready for the skip anyway (bearings have gone, motor case rusted solid so can't split it, filter basket is falling apart and the cost of parts plus new seals outweigh the cost of a new pump anyway) so not to fussed if the threads go: Only reason why I need to check is I'm 99% certain its the wrong size pump. Measuring the dynamic head will back up and confirm my calculations.
Pump is ready for the skip anyway (bearings have gone, motor case rusted solid so can't split it, filter basket is falling apart and the cost of parts plus new seals outweigh the cost of a new pump anyway) so not to fussed if the threads go: Only reason why I need to check is I'm 99% certain its the wrong size pump. Measuring the dynamic head will back up and confirm my calculations.
#11
That looks cheap and nasty quality, wouldn't trust it to check tyre pressures
Pump is ready for the skip anyway (bearings have gone, motor case rusted solid so can't split it, filter basket is falling apart and the cost of parts plus new seals outweigh the cost of a new pump anyway) so not to fussed if the threads go: Only reason why I need to check is I'm 99% certain its the wrong size pump. Measuring the dynamic head will back up and confirm my calculations.
Pump is ready for the skip anyway (bearings have gone, motor case rusted solid so can't split it, filter basket is falling apart and the cost of parts plus new seals outweigh the cost of a new pump anyway) so not to fussed if the threads go: Only reason why I need to check is I'm 99% certain its the wrong size pump. Measuring the dynamic head will back up and confirm my calculations.
I don't think the cheap and nasty gauges will cause you any problems, especially as you're saying the whole installation is shagged anyway, the cheap gauges will make it look good
measuring across a pump destined for the skip as you say might not give you the most accurate results
why not calculate your installations friction losses & head and then match that to the manufactures pump curves, then you'll know if the 150 was & is the correct pump required for your duty
you can always use your neighbours pool