Subfigure (a) uses present day environmental heads as the initial condition while subfigure (b) uses a
hydrostatic head condition computed assuming steady-state.
Doran, technical support engineer with Foxboro, says the electronic
hydrostatic head sensors have a high degree of accuracy in measuring the fluid level in a tank as long as the density of the liquid does not change dramatically due to temperature or compositional changes.
In real terms that is 0.6 inches of water and, converting to Joe Math, around 0.5 inch of
hydrostatic head. So a 35 mph wind blowing against a wall gives you about a 0.5 inch water gauge (w.g.).
ATI has just launched the FX 3000-IV
Hydrostatic Head Tester.
These advantages include
hydrostatic head, alcohol repellency, static decay and spray impact performance, Goldman adds.
Testing equipment manufacturer Textest, Zurich, Switzerland, has introduced the FX 3000-III automatic
hydrostatic head tester hydrotester.
The membrane also features a
hydrostatic head of greater than 12cm, a Gurley Hill porosity of greater than 10 seconds, a moisture vapor transmission rate, measured by the LYSSY method of 25g/m2/day.
This fine denier spunbond fabric of 17 gsm reaches 100-140 mmH2O
hydrostatic head, which complies with most of the market requirements for barrier leg cuffs with no melt blown layer between two spunbond layers.
It also has a
hydrostatic head of at least 60 cm and has a moisture vapor transmission rate, according to the desiccant method, of at least 2800 grams per [meter.sup.2] every 24 hours.
The following tests were performed according to current ASTM and INDA tests methods: basis weight, thickness and bulk density,
hydrostatic head, bending length and flexural rigidity.