BSP really stands for British Standard Pipe, but some days it feels like it should stand for Bloody Sizeable Pain when it causes confusion. Best to be sure before ordering, as bespoke items cannot be returned!
2.25″BSP is stock & standard for our Industrial purposes. 1.5″BSP is Domestic Standard in the UK, and we can do them bespoke, but our heaters are Industrial Quality, Fit & Forget, IP67 terminal box, highest quality elements manufactured in the UK using the highest quality component parts. So we simply don’t compete with the “Eastern” shite online for 3 shillings & sixpence.
Tables.
This is the simple INCH version…
BSP
“
DIAMETER
ACROSS
THREAD
“
1/2
.825
5/8
.902
3/4
1.041
7/8
1.189
1
1.309
1 & 1/4
1.650
1 & 1/2
1.882
1 & 3/4
2.116
2
2.347
2 &1/4
2.537
2 & 1/2
2.95
…so 2.25″BSP measures 2.537″, great!
Then my codged version, cos even I have to admit mm are a good deal easier to work with…
More importantly for us, on a daily basis, are the following limitations as to what will fit onto the smaller screwplug sizes. We deal with up to 2.25″ only, with 2.5″ being accommodated by fitting a brass adaptor to 2.25″ screwplug.
2.25″
3 loops + 2 STAT
2″
3 loops + 1 STAT
1.75″
2 loops + 1 stat / 3 U + 2 stat
1.5″
3 U 1 STAT
1.25″
3 U NO STAT or 1 element looped + 1 stat
Anything smaller than a 1.25″ screwplug will be limited to 1 element, having immediate implications for the achievable watts density. Likewise, being limited to U bends only, makes reducing the watts density more problematic. Many domestic and commercial plumbing applications use 1.5″BSP, and are thus limited to 3 hairpins and only 1 stat pocket. maximising the immersed length of those U’s is all that can be done to reduce the watts density. To overcome the issue of only 1 stat pocket, we find ourselves increasingly selling dual control and cutout stats.
Clarification.
By U bent element, we mean
…and looped means –
To determine what element is suitable, for U’s you merely double the maximum immersed length available, ie, 24″ immersed length will use U bent 48″ elements. However, if double looping is possible due to the screwplug size and other factors relating to the application (cleaning, etc), that 24″ maximum immersed length could be multiplied by up to 3.5, allowing the use of 84″ elements. See the watts density article to appreciate what a difference that will make. 48″ to 84″ almost double the hot element available, so is almost going to halve the watts density. A big issue on little screwplugs.
If you wanna buy some stuff, take your pick between
Immersion Heaters UK LtdBreweryHeaters.co.ukHeatingElements.co.uk
…but tbh, all roads lead to Jamie, on 01827 215684.
Call Jamie on 01827 215684 for a discount, to discuss thermostats, etc. I lose 2% in charges if you pay by card, & technology does go wrong. A conversation rarely does. Dismiss
