1AFTHAP m3a abreviado 10.03

Luis A. Agudo Fernández

AFTHAP CONFERENCE www.afthap.com

REINFORCED AND PRESTRESSED CONCRETE PIPE, STEEL CYLINDER TYPE

Module 3a:Tests on installed pipeline

(summary)

UNE-EN 805 Standard: Water supply.Requirements for systems and components outside buildings.

Instruction of the Eduardo Torroja Institute for reinforced or prestressed concrete pipes of Septiembre 2007 that follows and meets current European standards.

AFTHAP m3a abreviado 10.03 2

Standards

Calculated water hammer:

STP = MDP + 100 kPa = MDP + 1 atm

Not calculated water hammer the lowest of the following values:

- STP = MDP x 1,5

- STP = MDP + 500 kPa = MDP + 0.5 atm

AFTHAP m3a abreviado 10.03 3

Not calculating the water hammer increases pipes, anchorages, enclosures and so, considerably

TEST PRESSURE

Water supply

The amount of water that is neccessary to pump in order to hold the pressure for one hour is measured

Pressure loss

The pressure loss is measured for one hour

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Test methods

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Rw

max EeID

E1

ΔpV1,2ΔV

The admissible value of the water supply, at the end of the test, must not exceed the value of DV max

V --- volume of the pipeline stretch that is being tested in litres∆p --- admissible pressure loss, in kPa (20 kPa)Ew --- water modulus of elasticity, in kPaID --- inside diameter of the pipe, in meters e --- pipe wall thickness, in metersER --- tranversemodulus of elasticity of the pipe wall, in kPa1,2 --- correction factor (for example for residual air) during the pressure main test

PRUEBA THPCCJE VOLUMEN DE AGUA (LITROS)

3400

2100

1400

980 1040

450270 220 150 180

200

500

1000

1500

2000

2500

3000

3500

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Acceptance – reject criteria. Water supply method

La duración de la prueba de caída de presión debe ser de 1 hora, o de mayor duración si así lo especifica el proyectista.

Durante la prueba, la caída de presión ∆P debe presentar una tendencia regresiva y al finalizar la primera hora no debe exceder

de 20 kPaAFTHAP m3a abreviado 10.03 6

PRUEBA THPCCJE CICLOS PRESIÓN (EJEX-HORAS / EJEY- PRESION EN ATM)

0,6

6

3,8

2,7

6

4,5

3,93,53,4

6

54,6

6

4

6,5

4,9

6,5

5,45,14,94,8

6,5

5,7

6,5

5,9

6,5

5,3

5,9

6

6,16,5

0

1

2

3

4

5

6

7

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Acceptance – reject criteria. Pressure drop method

AFTHAP m3a abreviado 10.03 7

The test step by step

Type of pipe, material and joint

Diameter

Pressure

Length of the test stretches

constrution planning – logistics – temporal occupancy

pressure variation inside the stretch

water availability – water diversion between stretches

leveraging of valves, definitive anchorages and so.

hard searching of possible failures

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Points of attention

Surge pressures and negative pressures, water hammer

Air removal – provisional assembly

Pipeline closing and trenche filling

Anchorage of special elements

(elbows, bifurcations, valves)

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Test bulkheads and their anchorages

Points of attention

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Elements of anchorage laid out and with the proper safety

Air outlets operational (air valves can be removed during the filling of the pipe, not during the test)

Filling that favours, or at least that allows air exit (slow and from the bottom if possible)

Keep the pipe full and with pressure until concrete saturation (see tables of losses)

Control of anchorages during the test

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Test of a stretch