ДСТУ Б EN 295-1:2012
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(EN 295-1:1991+
(EN 295-1:1991+
1 2 3 4 IV
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9
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^aц?io^aё?ь?^и?й? 1 2 3 4 5 6 7 CONTENTS
Page
Foreword IV
1 General 1
2 Pipes and fittings 3
3 Joint assemblies 9
4 Sampling for tests 16
5 Designation 16
6 Marking 17
7 Quality assurance 17 EN 295-1:1991 - - - d)
^AЦ?IO^AЁ?Ь?^И?Й? Vitrified clay pipes and fittings and pipe joints for drains and sewers - Part 1: Specifications 1 1.1 1 General
1.1 Object and field of application
This part of this European Standard specifies requirements for flexibly jointed vitrified clay pipes and fittings with or without sockets for the construction of drainage and sewerage systems. Although normally operated under gravity, the pipes and fittings covered by this Standard will accept periodic hydraulic surcharge.
If pipes are required to withstand continuous working under low pressure, the pressure used in tests in this standard shall be agreed between the manufacturer and the purchaser with a maximum test pressure of 600 kPa (6,0 bar).
The preferred dimensions for pipe lengths, curvature of bends and angles of junction arms are specified in this standard. Other values for these dimensions are acceptable providing the products meet all the relevant performance requirements and are marked correctly.
Fittings groups covered by this part of this standard are given in Table 2 of EN 295-2.
Where this standard provides for different strength classes, different systems of jointing dimensions, different lengths and different fittings, the specifiers/ purchasers may select according to their requirements.
1.2 ^ EN 295-2 1991 EN 295-3 1991 EN 681-1:1996 1.3 B 1.3.1 1.3.2 1.3.3 3’ 1.3.4 ^ 1.3.5 y 1.3.6 1.3.7 ^ 1.3.8 1.3.9 ^ 1.2 Normative references
EN 295-2:1991 Vitrified clay pipes and fittings and pipe joints for drains and sewers: Part 2: Quality control and sampling.
EN 295-3:1991 Vitrified clay pipes and fittings and pipe joints for drains and sewers: Part 3: Test methods.
EN 681-1:1996 Elastomeric seals - Material requirements for pipe joint seals used in water and drainage applications - Part 1: Vulcanized rubber.
1.3 Definitions
For the purposes of this European Standard the following definitions apply:
1.3.1 Nominal Size (DN)
A numerical designation of size which is a convenient round number equal to or approximately equal to the bore in millimetres.
1.3.2 Curvature
The angle subtended by the length of a curved fitting at the centre of a circle of nominal radius through the centreline of the fitting.
1.3.3 Joint assembly
The adjacent ends of pipes, fittings or adaptors and the means of joining them.
1.3.4 Bearing elements
Spigots and sockets or couplings designed to include sealing elements with or without fairings.
1.3.5 Sealing elements
Factory made components which seal the joints, and are supplied by the pipe manufacturer.
1.3.6 Fairings
Any components located between bearing and sealing elements to reduce tolerances of sealing surfaces.
1.3.7 Minimum bore
Smallest bore measured within 100 mm of the ends of the pipe.
1.3.8 Pipe section
A short length of pipe barrel equal to or greater than 300 mm.
1.3.9 Nominal length
Numerical designation of length approximately equal to the internal length of the pipe barrel.
2 2.1 2 Pipes and fittings
2.1 Materials and manufacture
Pipes and fittings shall be made from suitable clays and fired to vitrification. The clays shall be of such a quality and homogeneity that the final product is in accordance with this standard. Pipes and fittings shall be sound and free from such defects as would impair their function when in service.
Visual defects, such as missing glaze, uneve- ness, creasings in the transition from pipe to socket and slight surface damage are acceptable, providing the impermeability, durability and flow characteristics of the pipes and Gttings are unaffected. Pipes and fittings may be unglazed or glazed on the interior and/or exterior. When glazed they need not be glazed on the jointing surfaces of the spigot and socket.
Pipes and fittings are regarded as rigid (stiff), the joints as flexible, and all have a high corrosion resistance. Fittings may be completed by fixing fired parts together. Products may be surface treated after firing.
2.2 Table 1 - Minimum bore
^ 2.3 ^ Other nominal sizes > DN 100 may be manufactured to comply with this standard, providing that the minimum permissible bore is not more than 2,5% less than the nominal size, rounded to the nearest mm.
2.3 Length
The preferred nominal lengths of pipes of DN 200 and greater either shall be as in table 2 or they shall be whole multiples of 250 mm. There are no preferred nominal lengths for DN 100 and DN 150 pip Nominal size (DN) 2.4 2.5 Moreover lengths of 1,0 m, 1,6 m and 1,85 m are also preferred for the range DN 200-450.
The limits of tolerance on the nominal length for pipes measured to the nearest whole mm shall be -1 % +4 %, with minimum limits of tolerance of 2.4 Squareness of ends
The deviation from squareness measured at the pipe ends shall be not greater than 6 mm up to and including DN 300.
Greater than DN 300, the deviation shall not exceed 2 % of DN. The test method is given in clause 2 of EN 295-3.
2.5 Deviation from straightness
When tested in accordance with clause 3 of EN 295-3, the permissible deviation from straightness of the barrel of a pipe shall be not greater than the values given in table 3, measured to the nearest whole mm. Table 3 - Deviation from straightness in mm/m nominal length
^ <DN150 2.6 2.7 2.8 2.9 2.6 Water seal of fittings
Trapped fittings for drainage outside buildings and sewerage shall provide a minimum water seal depth of 50 mm.
2.7 Angle of curvature and radius of bends
The preferred nominal curvatures of bends are 11,25 The tolerance of curvature shall be The radius, measured to the neutral axis, shall be not less than the nominal size in mm except for knuckle bends, which are allowed up to DN 150.
2.8 Branch angle of junctions
The preferred nominal angles of junction arms are 45 2.9 Crushing strength (FN)
When tested in accordance with clause 4 of EN 295-3, the crushing strength (FN) of pipes or pipe sections shall be not less than the values given in tables 4 and 5. Table 4 - Crushing strength (FN) in kN/m DN 100 and 150
^ ^ Higher crushing strengths may be declared for DN 100 or DN 150 pipes, provided that the increase is in steps of 6 kN/m. Table 5 - Crushing strength (FN) in kN/m DN > 200
* Lower strength pipes.
The crushing strength of other nominal sizes other than Class L shall be calculated from the formula
1000 Class Number Crushing strength = 1000
2.10 Higher crushing strengths may be declared providing that they conform to the requirements of the next higher class. Class numbers are restricted to 95,120, 160 and 200, thereafter in increments of 40.
Note: For the purpose of structural design the nominal wall thickness and/or nominal outside diameter should be declared by the manufacturer.
2.10 Bending tensile strength
Where whole pipes or pipe sections are not available a bending tensile strength test in accordance with clause 5 of EN 295-3 may be carried out on broken pipe pieces to determine the crushing strength of a pipe.
The crushing strength of the pipe shall be calculated from the mean bending tensile strength of at least 10 test pieces.
2.11 2.11 Bending moment resistance (BMR)
When tested in accordance with clause 6 of EN 295-3 the bending moment resistance for pipes with nominal sizes up to and including 225 and with nominal lengths greater than 1,1 m shall be not less than that given in table 6 Table 6 - Bending moment resistance (BMR) in kN • m for crushing strength values (FN) in kN/m
^ 2.12 2.12.1 Mi^i 2.12.2 M 2.13 ^ Higher bending moment resistance values may be required if higher values for crushing strength than those in tables 4 and 5 are declared.
2.12 Bond strength of adhesive used for fixing fired clay parts together
2.12.1 Minimum bending tensile strength
Fabricated test specimens shall not fracture through the adhesive nor at the adhesive clay interface under a bending tensile stress of 5 N/mm 2 after full curing when made and tested in accordance with clause 7 of EN 295-3.
2.12.2 Minimum strength after immersion
Test as in 2.12.1 but after immersion in test solutions as specified in clause 20 of EN 295-3.
2.13 Fatigue strength under pulsating load
Vitrified clay pipes specified in this standard are resistant to fatigue from pulsating loads. For special circumstances of application the resistance to fatigue shall be verified by cyclic loading of 2 2.14 Bo 2.15 X 2.16 2.17 2.18 2.14 Watertightness of pipes, bends and junctions
When pipes bends, junctions or pipe sections are tested in accordance with clause 9 of EN 295-3 the water addition W 15 needed to maintain the pressure of 50 kPa (0,5 bar) shall not exceed 0,07 litres/m 2 of internal pipe wetted surface area without leakage.
2.15 Chemical resistance
Vitrified clay pipes and fittings specified in this standard are resistant to chemical attack. For special circumstances of application the chemical resistance may be determined by the use of the test in clause 10 of EN 295-3.
2.16 Hydraulic roughness
Vitrified clay pipes and fittings specified in this standard have a low hydraulic roughness. For special circumstances of application the hydraulic roughness may be verified by the use of the test in clause 11 of EN 295-3.
2.17 Abrasion resistance
Vitrified clay pipes and fittings specified in this standard are resistant to abrasion. For special circumstances of application the abrasion resistance may be determined by the use of the test method in clause 12 of EN 295-3.
2.18 Airtightness
Pipes, bends, junctions and pipe sections shall be tested in accordance with clause 13 of EN 295-3:1991.
The barrels shall be tested by either method LA, LB, LC or LD given in table 7 and shall withstand an initial air pressure p 0 . The measur