BS EN 15795:2010 pdf download

BS EN 15795:2010 pdf download.Products used for treatment of water intended for human consumption —Natural unexpanded aluminosilicates.
The structure is crystalline with a rough surface. The particle shape is spherical or cubic depending mainly on the origin and manufacturing procedure (quarrying or dredging, or crushing). The shape influences filtration performance, see A.4.
The product shall be generally homogeneous and shall be visibly free from impurities and contamination.
5.2 PartIcle size distribution
The particle size distribution shall be determined on samples taken al the point of manufacture using the method of test given in EN 12902.
NOTE I The particle size can decrease during traisportation and handbng.
The particle size distribution shall be described by either:
a) 1) effective size: (d10) with a permitted tolerance of ± 5%;
2) uniformity coefficient: (U) shall be less than 1.5;
3) mrrium size: (d1) with a permitted tolerance of ±5 %;
b) 1) by particle size range and by mass fraction of oversize and undersize particles according to application.
2) The mexWnum contents of oversize and undersize shaM be a mass fraction of 5 % for application of the product as a filtration layer in multi media filters and a mass fraction of 10 % for use in single media filters For use as a support layer, maximum mass fractions of oversize and undersize of 15 % are acceptable. See A,2.3 for examples of available particle sizes that are used.
NOTE 2 Other values can be necessary for certawi applications
5.3 DensIty
5.3.1 Bulk density loose
The bulk density loose shall be in the range of 1 250 kg/m3 to 1 550 kg/m3
5.3.2 Bulk densIty packed
The bulk density packed shall be in the range of 1 400 kg/m3 to 1 750 kg/ni3.
6 Chemical properties
This European Standard specifies the minImum punty requirements for natural unexpanded atuminosltleates used for the treatment of water intended for human consumption. Limits are given for impurities commonly present in the product Depending on the raw material and the manufactunng process other Impunties may be present and, if so. this shall be notified to the user and when necessary to relevant authorities.
NOTE I Users of this product ahould diedi the national regulations ii order to clarify whether it is of appropriate purity for treatment of water intended for human consumption, taking into account raw water quality, contents of other inwuflties and additives tned lithe products not stated in the product standard
A.3.4 Secondary effects
The products have no secondary effects.
A.4 Hydraulic characteristics
A.4.1 Interstitial volume
The interstitial volume Is approximately 0.4 to o.s v/v (40 % to 50 % by volume). If used for calculations the
interstitial volume should be measured.
A.4.2 Head loss In filtration
Head loss depends on size, shape and roughness of particles, filtration rate, filter bed depth, and water temperature.
A.4.3 Expansion in up-flow washing
The expansori during washing depends on flow rate, effective size, density, shape and roughness of particles, and water temperature
A.5 Rules for safe handling and use
Natural unexpanded aluminosilecates are not hazardous products but the following precautions should be taken:
— It recommended to avoid dust formation:
when handling dry product the use of a dust mask is recommended, especially when using air conveying
A.6 Emergency procedures
AOl First aid
In case of contact with skin, it is recommended to wash with water,
In case of contact with eyes, It is recommended to flush with plenty of water.
In case of inhalation, it is recommended to move to fresh air.
A.6.2 Spillage
It recommended to sweep up and to discard In a refuse container or repackage. It Is recommended to dispose of
in accordance with local regulatlons
A.6.3 Fire
No special requirements are necessary.