|
|
Bivvy hydrostatic head
In specs for bivvys they quote a hydrostatic head, for example 3,500mm or
5,000mm. Can someone please explain what this means. Cheers ....... Richard --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.518 / Virus Database: 316 - Release Date: 9/11/03 |
Bivvy hydrostatic head
Waterproofness can be a very subjective term with words like showerproof and
water resistant sometimes being used . The term hydrostatic head is used to denote the amount of pressure of water that is required in order to penetrate a given fabric. In order to measure the amount of this pressure a column of water is pressed against the fabric and the height of the column is increased until the water penetrates the fabric. The British Ministry of Defence definition for a waterproof fabric is that it must resist a column of water at least eighty centimetres high. Every batch of fabric that is coated for HORESWARE is tested and must resist a column of water at least a hundred and fifty centimetres, that is five feet high. And this is the minimum acceptable standard. Normally most of our fabrics have hydrostatic head of at least 300 centimetres and so that after years of use it should still maintain hydrostatic head of at least 100 centimetres plus. http://www.horseware.com/faq.asp?FAQ=5 Not being a clever dick. I sound it on a google search. That should satisfy your curiosity. -- I smile and go off waving (Amiably) - for that's my way Baal "Baal" wrote in message ... http://www.awta.com.au/Textiles/Publ...s/pdf/T29B.pdf -- I smile and go off waving (Amiably) - for that's my way Baal "Richard" wrote in message ... In specs for bivvys they quote a hydrostatic head, for example 3,500mm or 5,000mm. Can someone please explain what this means. Cheers ....... Richard --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.518 / Virus Database: 316 - Release Date: 9/11/03 |
Bivvy hydrostatic head
"Baal" wrote in message ... Waterproofness can be .... snip Not being a clever dick. I sound it on a google search. That should satisfy your curiosity. -- I smile and go off waving (Amiably) - for that's my way Baal It has, another mystery solved .... thanks ..... Richard --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.518 / Virus Database: 316 - Release Date: 9/11/03 |
Bivvy hydrostatic head
Or put more practically if not more formally correct, it measures how hard
it would have to rain on your bivvy before water started going through the cover. If it rained hard enough to pass through sheeting rated at 3500mm hydrostatic pressure, I would leave my bivvy and other fishing gear behind and take up a crash course in ark building. "Baal" wrote in message ... Waterproofness can be a very subjective term with words like showerproof and water resistant sometimes being used . The term hydrostatic head is used to denote the amount of pressure of water that is required in order to penetrate a given fabric. In order to measure the amount of this pressure a column of water is pressed against the fabric and the height of the column is increased until the water penetrates the fabric. The British Ministry of Defence definition for a waterproof fabric is that it must resist a column of water at least eighty centimetres high. Every batch of fabric that is coated for HORESWARE is tested and must resist a column of water at least a hundred and fifty centimetres, that is five feet high. And this is the minimum acceptable standard. Normally most of our fabrics have hydrostatic head of at least 300 centimetres and so that after years of use it should still maintain hydrostatic head of at least 100 centimetres plus. http://www.horseware.com/faq.asp?FAQ=5 Not being a clever dick. I sound it on a google search. That should satisfy your curiosity. -- I smile and go off waving (Amiably) - for that's my way Baal "Baal" wrote in message ... http://www.awta.com.au/Textiles/Publ...s/pdf/T29B.pdf -- I smile and go off waving (Amiably) - for that's my way Baal "Richard" wrote in message ... In specs for bivvys they quote a hydrostatic head, for example 3,500mm or 5,000mm. Can someone please explain what this means. Cheers ....... Richard --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.518 / Virus Database: 316 - Release Date: 9/11/03 |
| All times are GMT +1. The time now is 11:22 AM. |
Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004 - 2006 FishingBanter