BS/EN 295-5-2013 pdf download.Vitrified clay pipe systems for drains and sewers Part 5: Requirements for perforated pipes and fittings.
This BS/EN 295-5 specifies different strength classes and areas of perforations.
NOTE 1 The speciflecslpurchasers can select them according to their requirements.
NOTE 2 Corresponding provisaons for the evaluation of confornity (ITT and FPC) and sampling and those for the test
methods are further specified in EN 295-2 and EN 295-3, respectively.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 295-1:2013, Vitrified clay pipe systems for drains and sewers — Part 1: Requirements for pipes. fittings and joints
EN 295-2:2013, Vitrified clay pipe systems fix drains and sewers — Part 2: Evaluation of conformity and sampling
EN 295-3:2012, Vitrified clay pipe systems for drains and sewers — Part 3: Test methods
3 Terms and definitions
For the purposes of this document, the temis and definitions given in EN 295-1:2013 and the following apply.
area of perforations
total area of holes or slots per metre length measured on the inside of the pipe
4 Requirements for pipes and fittings
4.1 Material, manufacture, water absorption and appearance
For material, manufacture, water absorption and appearance, perforated pipes and fittings shall comply with
EN 295-1:2013, 51.
4.2 Internal diameter
The internal diameter shall not be less than the vahies according to Table 1.
Other nominal sizes can be manufactured to comply with this standard, providing that the minimum internal
diameter shall be not less than 97,5 % of the nominal size, rounded to the nearest whole mm.
4.3 Length
Preferred lengths of pipes and straight fittings are not specified in this standard.
The length shall be measured to the nearest whole millimetre. The tolerance on the declared nominal length of
pipes and straight fittings shall be from —2 % to + 5%, or ± 10mm, whichever is the Larger.
4.4 Deviation from straightness
When tested in accordance with EN 295-3:2012, Clause 6, the deviation from straightness of the barrel of a pipe shall not be greater than the values given in Table 2, measured to the nearest whole millimetre.
4.6 Branch angle of junctions
The preferred nominal angles of junction arms are 45Q and 90°. The tolerance for the branch angle shall be ± 5° of the nominal value.
4.7 Perforations
4.7.1 General
The holes in perforated pipes shaH be either circular or slotted, and shall be cleanly cut. They shall be positioned in rows parallel to the longitudinal axis of the pipe, the holes in each row being spaced equidistantly. The permissible deviation of the spacing between the holes in any row shall not exceed ± 20 mm. Pipes need not be perforated within 100 mm of their ends. Fittings need not be perforated.
The diameter of circular holes at the inside of the pipe shall be not greater than 13 mm. If slots are used instead of circular holes, the width of slots at the inside of the pipe shall be not greater than 8 mm.
4.7.2 Arrangement of perforations
The perforations shall be arranged in one of the following configurations shown in Figure 1:
a) totally perforated pipe (TP) which is symmetrically perforated around its entire circumference;
b) locally perforated pipe (LP) which is symmethcally perforated over up to 270° of its circumference;
c) multipurpose pipe (MP), which is symmetrically perforated over up to 120° of its circumference.
This standard does not specify requirements for joints. Perforated pipes can be fitted with flexible Jdnts (e.g. according to EN 295-1) or used with other jornts. Where necessary, the joint material requirements shall be agreed between the manufacturer and the specifier/purchaser.
6 Common requirements for pipes and fittings
6.1 Reaction to fire
Where the use of perforated vitrified clay pipes and fittings is subject to national regulatory requirements on reaction to fire, their reaction to fire performance shall be declared. Perforated vitrified clay pipes and fittings in use are classified as Class Al without the need for testing (CWT) in accordance with the relevant Commission decision1).
NOTE1 Vitrified clay, as a homogeneously distnbuted material for these products, is considered as material of known and stable performance with respect to the reaction to fire performance as it does not consist of any organic material and consequently does not contribute to the fire. Under this condition it may be considered as the Class Al material.
NOTE 2 The class of reaction to fire performance of perforated vitrified day pipes with their joints is regarded as the class for the constituent material (I.e. vitrified clay).
Conversely, where use of this product is not subject to national regulatory requirements on reaction to fire, either the Class Al (see above) or Class F (see Note 3) may be declared.
NOTE 3 Class F according to EN 13501-1 is equivalent to “No Performance Determined” (NPO).
6.2 Durability
Perforated vitrified clay pipes and fittings for drains and sewers are products of known and stable performance for defined end use applications with respect to their established durability for which experience has been accumulated over a long period of time.
Durability of cwshing strength is ensured by meeting the requirements of 4.1 and 4.9.
6.3 Dangerous substances
National regulations on dangerous substances may require verification and declaration on release, and sometimes content, when construction products covered by this standard are placed on those markets. In the absence of European harmonised test methods, verification and declaration on release/content should be done taking into account national provisions in the place of use.
NOTE An informative database covering European and national provisions on dangerous subsiances is available at the Construction web site on EUROPA accessed through: h://ec.europa.eu/enterpnselconstructionJcrjd-dst.BS/EN 295-5-2013 pdf download.