BS EN 545:2006 pdf download

BS EN 545:2006 pdf download.Ductile iron pipes,fittings, accessories and
their joints for water pipelines一Requirements and test methods.
— metallic zinc spray complying with 4.4.2.2. or application of zinc-rich paint containing at least 90 % zinc by mass of dry f’dm and with a mean mass of applied paint not less than 150 g/m2: and
application & a finishing layer complying with 4.4.2.2.
4.4.3 Internal lining of cement mortar
4.4.3.1 Gneral
Unless specified in the corresponding European Standard, the internal cement mortar lining of ductile iron pipes shall comply with the following requirements.
The cement mortar lining of ductile iron pipes shall constitute a dense, homogeneous Layer covering the total intemal surface of the pipe barrel.
It shall be works-applied by a centrifugal spinning process or a centrifugal spray head or a combination of these methods, Smoothing with a trowel is permitted
Prior to application of the lining, the metal surface shall be free from loose material and oil or grease.
The cement mortar mix shall compnse cement, sand and water. If admixtures are used, they shall comply with 4.1.4, and they shall be declared. The ratio by mass of sand to cement shall not exceed 3,5. At the mixing stage, the ratio by mass of total water to cement depends on the manufacturing process and shall be determined such that the lining is In accordance with 4.4.3.2 and 4.4.3.3.
The cement shall be one of those listed in EN 197-1 or sulphate resisting cement. High alumina cement may be used for raw water or for specific applications as agreed between manufacturer and purchaser. The cured lining shall comply with 4.1.4. The sand shall have an appropriate grading and shall not contain organic rpurities or fine clay particles which may affect the lining quality. The water used in the mortar mix shall be drinking water or water of comparable quality.
After application of the fresh lining, controlled curing shall be carried out so as to provide sufficient hydration to the cement.
The cured lining shall comply with 4.1.4, 4 4.3.2 and 4.4.3.3.
4.4.3.2 Strength of the lining
When measured in accordance with 7.1, the compressive strength of the cement mortar after 28 days of cunng shall be not less than 50 MPa.
NOTE The compwessrve strength of the lining ‘s directly reLated to other functional properties such hl) density, good bond and low porosity
4.4.3.3 Thickness and surface condition
The nominal thickness of the cement mortar lining and its tolerance shall be as given in Table 8. When measured in accordance with 6.8, the lining thickness shall be within the specified tolerance
The surface of the cement mortar lining shall be uniform and smooth. Trowel marks, protrusion of sand alns and surface texture inherent to the method of manufacture are acceptable. But there shall be no recesses or local defects which reduce the thickness to below the minimum value given in Table 8.
Fine crazing and hairline cracks associated with cement rich surface may appear in dry linings. When shrinkage cracks inherent to cement-bound materials have developed In the dry linings, the crack width and the corresponding radial displacement shall not exceed the values given in Table 8.
NOTE I Ceineni moilar linings at pe ends can have a diamler of maximum length 20 mm,
NOTE 2 Storage of pipes and ltttings in a hot, dry envronrnent can cause metal expansion and mortar shrrikage wtuch may result in the dry hnwig developing areas 01 disbandment end shrwikage cracks exceedrig the width given in Table 8 When the lining is re-exposed to water, it will swell by absorption of moisture and the cracks will close to conform to Table 8 and will eventually heal by an autogenous process.
4.4.3.4 Repairs
Repairs to areas of damaged linings shall be effected by the use of either cement mortar (see 4.4.3.1) or a compatible polymer mortar application may be by hand.
Prior to the application of the repair mortar, the damaged area shall be cut back to the sound lining or to the metal surface and all loose material shall be removed. After completion of the repair, the lining shafl be in accordance with 4.4.3.1, 4.4.3.2,4.4.3.3, and 4.1.4.
4.5 Coatings for fittings and accessories
4.5.1 General
Unless otherwise agreed between manufacturer and purchaser, all fittings, accessories and pipes not centrifugally cast shall be delivered externally and internally coated by a paint coating in conformity with 4.5.2; fittings may also receive an internal lining of cement mortar conforming with 4.4,3, machine or hand applied, as a supplement to or as a replacement of the above paint coating.
The following coatings may also be supplied, depending on the external and witernal conditions of use:
a) External coatings:
— zinc rich-paint coaling with fmeshlng layer;
— polyethylene sleeving (as a supplement to the paint coating or to the zinc rich paint coating with finishing layer);
thicker electro-deposited coating with a mmwnum thickness of 50 ljm, applied on a blast-cleaned and phosphated surface;
adhesive tape;
— epoxy coating.