SIST EN 16932-2:2018
(Main)Drain and sewer systems outside buildings - Pumping systems - Part 2: Positive pressure systems
Drain and sewer systems outside buildings - Pumping systems - Part 2: Positive pressure systems
This European Standard specifies requirements for design, construction and acceptance testing of wastewater pumping systems in drain and sewer systems outside the buildings they are intended to serve. It includes pumping systems installations in drain and sewer systems that operate essentially under gravity as well as systems using either positive pressure or partial vacuum.
This document is applicable to positive pressure systems.
Entwässerungssysteme außerhalb von Gebäuden - Pumpsysteme - Teil 2: Druckentwässerungssysteme
Diese Europäische Norm legt Anforderungen für die Planung, den Bau und die Abnahmeprüfung von Pumpsystemen in Entwässerungssystemen außerhalb von Gebäuden, zu deren Entwässerung sie dienen, fest. Sie betrifft Pumpsysteme in Entwässerungssystemen, welche hauptsächlich als Freispiegelsysteme, sowie Systeme, die entweder mit Überdruck oder Unterdruck betrieben werden.
Dieser Teil gilt für Überdrucksysteme.
Réseaux d'évacuation et d'assainissement à l'extérieur des bâtiments - Systèmes de pompage - Partie 2 : Systèmes sous pression
La présente norme européenne fournit des prescriptions pour la conception, la construction et les essais d’acceptation des systèmes de pompage des eaux usées dans les réseaux d’évacuation et d’assainissement à l’extérieur des bâtiments qu’ils sont destinés à desservir. Elle couvre les installations de systèmes de pompage dans les réseaux d’évacuation et d’assainissement, principalement les réseaux gravitaires, ainsi que les réseaux utilisant soit une pression positive, soit un vide partiel.
Le présent document s’applique aux réseaux sous pression positive.
Sistemi za odvod odpadne vode in kanalizacijo zunaj stavb - Črpalni sistemi - 2. del: Tlačni sistemi
Ta evropski standard določa zahteve za projektiranje, izdelavo in preskušanje sprejemljivosti črpalnih sistemov odpadnih vod v sistemih za odvod in kanalizacijo zunaj stavb, v katerih so namenjeni za delovanje. Vključuje inštalacije črpalnih sistemov v sistemih za odvod in kanalizacijo, ki delujejo zlasti s pomočjo gravitacije, kot tudi v sistemih, ki uporabljajo pozitivni tlak ali delni vakuum.
Ta dokument se uporablja za sisteme s pozitivnim tlakom.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 16932-2:2018
01-junij-2018
1DGRPHãþD
SIST EN 1091:2000
SIST EN 1671:1998
6LVWHPL]DRGYRGRGSDGQHYRGHLQNDQDOL]DFLMR]XQDMVWDYEýUSDOQLVLVWHPL
GHO 7ODþQLVLVWHPL
Drain and sewer systems outside buildings - Pumping systems - Part 2: Positive
pressure systems
Entwässerungssysteme außerhalb von Gebäuden - Pumpsysteme - Teil 2:
Druckentwässerungssysteme
Réseaux d'évacuation et d'assainissement à l'extérieur des bâtiments - Systèmes de
pompage - Partie 2 : Systèmes sous pression
Ta slovenski standard je istoveten z: EN 16932-2:2018
ICS:
93.030 Zunanji sistemi za odpadno External sewage systems
vodo
SIST EN 16932-2:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 16932-2:2018
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SIST EN 16932-2:2018
EN 16932-2
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2018
EUROPÄISCHE NORM
ICS 93.030 Supersedes EN 1091:1996, EN 1671:1997
English Version
Drain and sewer systems outside buildings - Pumping
systems - Part 2: Positive pressure systems
Réseaux d'évacuation et d'assainissement à l'extérieur Entwässerungssysteme außerhalb von Gebäuden -
des bâtiments - Systèmes de pompage - Partie 2: Pumpsysteme - Teil 2: Druckentwässerungssysteme
Systèmes sous pression
This European Standard was approved by CEN on 22 January 2018.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16932-2:2018 E
worldwide for CEN national Members.
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SIST EN 16932-2:2018
EN 16932-2:2018 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Symbols and units . 7
5 General . 8
6 Planning of positive pressure systems . 8
6.1 Type of pumping station . 8
6.1.1 Introduction . 8
6.1.2 Pumping stations with submersible pumps . 9
6.1.3 Pumping stations with dry installed pumps . 11
6.1.4 Other types of pumping stations . 11
6.2 Selection of type of pumping station . 12
6.3 Route and profile of rising mains . 12
7 Hydraulic design of pumping systems . 13
7.1 Introduction . 13
7.2 Establish inflow rates . 15
7.2.1 Foul wastewater pumping stations . 15
7.2.2 Surface water pumping installations . 15
7.2.3 Combined sewer pumping stations . 15
7.3 Select desired pump flow rates . 15
7.4 Dimensioning collection tank . 15
7.5 Select rising main diameter. 16
7.5.1 Pumping stations . 16
7.5.2 Pressure sewer systems . 17
7.6 Retention period . 17
7.7 Calculation of system characteristics . 18
7.7.1 System head calculation . 18
7.7.2 Pressure sewer systems . 20
7.8 Selection of pump units and duty points . 20
7.9 Check pressure transients (waterhammer) . 22
8 Detailed design of pumping stations . 23
8.1 General . 23
8.2 Layout . 23
8.3 Collection tank . 24
8.4 Pump units . 25
8.4.1 Pumps . 25
8.4.2 Air compressor units . 25
8.5 Controls and electrical equipment and instrumentation . 25
9 Septicity . 26
9.1 General . 26
9.2 Control of septicity. 27
9.2.1 General . 27
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9.2.2 Limiting retention period . 27
9.2.3 Air flushing . 27
9.2.4 Chemical treatment . 28
9.2.5 Hydrogen sulphide stripping . 28
9.2.6 Dilution of the septic wastewater in fresh wastewater . 28
10 Testing and verification . 28
10.1 Pumping stations . 28
10.2 Rising mains . 28
10.3 Commissioning . 28
11 Operation and maintenance manual . 29
Bibliography . 30
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SIST EN 16932-2:2018
EN 16932-2:2018 (E)
European foreword
This document (EN 16932-2:2018) has been prepared by Technical Committee CEN/TC 165
“Waste water engineering”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by October 2018, and conflicting national standards shall
be withdrawn at the latest by October 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN not be held responsible for identifying any or all such patent rights.
Together with EN 16932-1:2018 and EN 16932-3:2018, this document supersedes EN 1091:1996 and
EN 1671:1997.
EN 16932, Drain and sewer systems outside buildings — Pumping systems, contains the following parts:
— Part 1: General requirements;
— Part 2: Positive pressure systems;
— Part 3: Vacuum systems.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
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SIST EN 16932-2:2018
EN 16932-2:2018 (E)
1 Scope
This European Standard specifies requirements for design, construction and acceptance testing of
wastewater pumping systems in drain and sewer systems outside the buildings they are intended to
serve. It includes pumping systems in drain and sewer systems that operate essentially under gravity as
well as systems using either positive pressure or partial vacuum.
This document is applicable to positive pressure systems.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 1610:2015, Construction and testing of drains and sewers
EN 12050-1:2015, Wastewater lifting plants for buildings and sites — Part 1: Lifting plants for
wastewater containing faecal matter
EN 12050-2, Wastewater lifting plants for buildings and sites — Part 2: Lifting plants for faecal-free
wastewater
EN 12050-3, Wastewater lifting plants for buildings and sites — Part 3: Lifting plants for limited
applications
EN 12050-4, Wastewater lifting plants for buildings and sites — Part 4: Non-return valves for faecal-free
wastewater and wastewater containing faecal matter
EN 16323:2014, Glossary of wastewater engineering terms
EN 16932-1:2018, Drain and sewer systems outside buildings — Pumping systems — Part 1: General
requirements
EN 16933-2:2017, Drain and sewer systems outside buildings — Design — Part 2: Hydraulic design
EN ISO 9906:2012, Rotodynamic pumps — Hydraulic performance acceptance tests — Grades 1, 2 and 3
(ISO 9906:2012)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 16323, in EN 16932-1 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
Note 1 to entry: Certain key definitions from EN 16323:2014 have been repeated below for clarity. The
following additional terms used in this document are defined in EN 16323:
aerobic; maintenance;
anaerobic; pumping station;
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SIST EN 16932-2:2018
EN 16932-2:2018 (E)
collection tank; relevant authority;
combined system; retention period;
confined space; rising main;
drain; septic wastewater;
dry weather flow; sewer;
extraneous flow; sewer system;
gradient; wastewater treatment plant.
infiltration;
Note 2 to entry: The following terms used in this part of this standard are defined in EN 16932-1:2018:
collection chamber; pump;
duty point; pump unit
forwarding pump; pumping system;
level sensor; vacuum station.
lift station;
profile;
3.1
ball passage
passage where a ball with a defined diameter can pass through without deformation
[SOURCE: EN 12050-1:2015, 3.1.9]
3.2
foul wastewater
wastewater comprising domestic wastewater and/or industrial wastewater
[SOURCE: EN 16323:2014, 2.1.2.6]
3.3
net positive suction head
NPSH
amount of the absolute value of the total head above the head equivalent to the vapour pressure of the
liquid at the particular temperature, with reference to the NPSH-datum plane
[SOURCE: EN ISO 17769-1:2012, 2.2.2.1]
3.4
NPSH datum plane
horizontal plane through the centre of the circle described by the external points of the entrance edges
of the impeller blades, in the first stage in the case of multi-stage pumps
[SOURCE: EN ISO 17769-1:2012, 2.2.2.1]
3.5
surface water
water from precipitation, which has not seeped into the ground and is discharged to the drain or sewer
system directly from the ground or from exterior building surfaces
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EN 16932-2:2018 (E)
[SOURCE: EN 16323:2014, 2.1.1.3]
3.6
wastewater
water composed of any combination of water discharged from domestic, industrial or commercial
premises, surface run-off and accidentally any sewer infiltration water
[SOURCE: EN 16323:2014, 2.3.10.65]
4 Symbols and units
a wave speed of pressure transients, in metres per second [m/s]
D internal diameter of the pipe (bore), in metres [m]
D internal diameter of the pipe (bore) in section i, in metres [m]
i
E 2
P elastic modulus of the pipe material, in Newtons per square metre [N/m ]
E 2
W elastic modulus of wastewater, in Newtons per square metre [N/m ]
f maximum permitted frequency of pump starts per hour [1/h]
g 2
acceleration due to gravity, in metres per second squared [m/s ]
H total head of the system, in metres [m]
s
H total head at the pump unit, in metres [m]
p
H required pump head in an air flushed rising main, or a rising main where air or gas
A
accumulation can occur, in metres [m]
h local head loss in the bends, valves and other fittings, in metres [m]
f
h head loss, in metres [m]
l
h head loss due to friction in the pipe, in metres [m]
p
h level difference between the end of the rising main and pump unit(s), in metres [m]
z,rm
Σh sum of the level differences of all downsloping sections in the rising main which can be
A,i
filled with air or gas, (i.e. the level differences between all their high and subsequent low
points), in metres [m]
h hydrostatic head, in metres [m]
z
Σk sum of the local head loss coefficients in bends, valves and other fittings in the pipeline
p
(dimensionless) [-]
Σk sum of the local head loss coefficients in bends, valves and other fittings in section i,
p,i
dimensionless [-]
L length of the pipeline, in metres [m]
L length of section i of the rising main, in metres [m]
i
L length of the pipeline before or after a closing device, in metres [m]
t
ΣL sum of the lengths of the downsloping sections in section i, which can be filled with air, in
A,i
metres [m]
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P power consumption of the pump unit, in Watts [W]
P
Δp Joukowski surge pressure, in Pascals [Pa]
max
Q 3
p pump flow rate, in cubic metres per second [m /s]
Q mean capacity of the active pump between switch on and switch off levels for the pump, in
pm
3
cubic metres per hour [m /h]
s wall thickness of the pipe, in metres [m]
t reflection period of the pressure wave, in seconds [s]
R
V working volume of the collection tank, which is the volume between the lowest pump
c
3
switch on level and the lowest switch off level, in cubic metres [m ]
v velocity in the direction of flow averaged across the flow cross-section, in metres per
second [m/s]
v velocity needed for air removal, in metres per second [m/s]
AR
v velocity of the design wastewater flow in section i, in metres per second [m/s]
i
Δv change in flow velocity, in metres per second [m/s]
α angle of the downsloping section downstream of a high point, in degrees
η efficiency of the pump unit, dimensionless [-]
P
λ friction coefficient, which is the pipeline headloss per unit length, dimensionless [-]
λ friction coefficient in section i, dimensionless [-]
i
μ lateral contraction coefficient of the pipe material, dimensionless [-]
ρ 3
density of wastewater, in kilogrammes per cubic metre [kg/m ]
5 General
This European Standard shall be read in conjunction with EN 16932-1. Positive pressure systems shall
comply with the requirements of EN 16932-1 as well as the requirements of this European Standard.
6 Planning of positive pressure systems
6.1 Type of pumping station
6.1.1 Introduction
Typical pumping station types include the following:
— pumping stations with submersible pumps;
— pumping stations with dry installed pumps;
— pumping stations with screw pumps;
— pumping assemblies;
— ejector tank stations.
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6.1.2 Pumping stations with submersible pumps
Pumping stations with submersible pumps are the most common type of pumping stations in drain and
sewer systems. They comprise one or more submersible rotodynamic pump units in a collection tank.
The pump units are connected to the rising main using fittings that allow the pump units to be removed
from, and replaced in the collection tank from the surface without the need for personnel to enter the
collection tank.
Key
1 collection tank 4 non-return valve
2 pump unit 5 isolating valve (alternative positions shown)
3 level sensor (pressure sensor shown, other 6 controls and electrical equipment and
methods are possible) instrumentation cabinet
Figure 1 — Example of pumping station with submersible pumps and no external valve chamber
The non-return valves can be installed either in the collection tank (see Figure 1) or in an adjacent valve
chamber (see Figure 2), allowing easier access for maintenance. Isolating valves can be buried directly
in the ground or installed in the collection tank (see Figure 1), or installed in a separate valve chamber
(see Figure 2). The choice depends on the anticipated frequency of maintenance and the availability of
access. The position of non-return valves should be sufficiently low to ensure tight closure.
An isolating valve can also be fitted on the incoming gravity drain or sewer.
Such pumping stations are suitable for a wide range of applications within the sewer network.
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Key
1 collection tank 5 isolating valve
2 pump unit 6 controls and electrical equipment and
instrumentation cabinet
3 level sensor (float switch shown, other methods 7 valve chamber
are possible)
4 non-return valve
Figure 2 — Example of pumping station with submersible pumps and external valve chamber
Key
1 collection tank 4 non-return valve
2 pump unit 5 isolating valve
3 level sensor (float switch shown, other methods
are possible)
Figure 3 — Example of a pumping station for use in pressure sewer systems
Figure 3 shows an example of a pumping station with submersible pumps for use in pressure sewer
systems.
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EN 16932-2:2018 (E)
6.1.3 Pumping stations with dry installed pumps
Pumping stations with dry installed pumps (see Figure 4) comprise a collection tank and one or more
rotodynamic pump units installed in an adjacent dry well. The pumping station valves are also installed
in the dry well. The advantage of this type of pumping station is that the pump units and associated
equipment can be installed in a cleaner and less hazardous environment.
Key
1 collection tank 5 isolating valve
2 pump unit 6 controls and electrical equipment and
instrumentation cabinet
3 level sensor (ultrasonic sensor shown other 7 dry well
methods are possible)
4 non-return valve
Figure 4 — Example of a pumping station with dry well installed pumps
6.1.4 Other types of pumping stations
Other types of pumping stations for special applications are available. These include:
a) In an ejector tank station wastewater flows by gravity into one or more sealed tanks. Each tank is
periodically emptied by closing its inlet and ventilation pipe, and admitting compressed air into the
top of the tank. This forces the wastewater from the bottom of the tank into the rising main.
National or local regulations or the relevant authority can require the periodic inspection of
pressure vessels. Ejector tank stations are suitable for high head and low flow applications. Ejector
tanks can also be used in vacuum stations instead of forwarding pumps, but are not usually used on
pressure sewer systems. Ejector tank stations have the additional advantage that they can also be
used for air flushing of the rising main by admitting more compressed air than is necessary to
empty the ejector tanks.
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EN 16932-2:2018 (E)
b) Pumping assemblies comprise a collection tank, pump units and valves in a single assembly. They
can be used for small applications (e.g. serving a single building). They can be installed in a dry
chamber on the drain from a building or site. Pumping assemblies shall be manufactured in
accordance with EN 12050 (all parts).
c) Progressive cavity pumping stations comprise a collection tank with a progressive cavity pump unit
with grinder at the pump inlet. The pump is typically powered by an electric motor. The rising main
is equipped with an isolation valve. They can be used for small applications (e.g. serving a single
building and in pressure sewer systems). Since they can develop very high pressures an automatic
over-pressure cut-out is required to avoid damage to the rising main. Progressive cavity pumps
have some suction lift capability. They can therefore be installed above ground.
6.2 Selection of type of pumping station
The type of pumping station should be selected taking account of the performance requirements, any
external constraints and the following criteria:
a) space available;
b) location in relation to the main traffic flow (e.g. pumping station not in the middle of the road, but
on the side)
c) geotechnical conditions on the site (e.g. groundwater level, load bearing capacity);
d) integration of pumping stations into other infrastructure (e.g. integration in a road underpass)
e) hydraulic performance requirements (i.e. the required head and flow rate);
f) whether it is necessary to create pressure or just lift the wastewater;
g) solids handling requirements;
h) access required for maintenance;
i) whole life costs (including initial costs,, operation and maintenance costs);
j) power consumption;
k) health and safety;
l) environmental impact.
6.3 Route and profile of rising mains
The route and profile of rising mains shall consider the following.
a) The profile shall provide adequate depth of cover to the pipe to protect the pipe from imposed
loads, frost and to avoid interference with other utility services.
b) Air or gas accumulation in rising mains reduces their capacity and creates conditions for corrosion
of the main. The profile and flow conditions of the main should ensure that air or gas accumulation
does not affect the performance of the main. Air or gas accumulation should be managed by one or
more of the following approaches:
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EN 16932-2:2018 (E)
1) minimizing the entry of unwanted air into the system by careful hydraulic design of the
collecting tank to reduce splashing and air entrainment;
2) preventing generation of gas by control of the formation of septic wastewater;
3) avoiding prominent high points in the profile of the rising main;
4) design of the rising main with very little downslope and a flow velocity that is sufficient to
drive air or gas through the rising main, thus preventing air or gas accumulation behind high
points;
5) provision of air valves at unavoidable prominent high points to remove accumulated air or gas;
6) operation of pumps in a manner that avoids drawing in air.
c) Sediment deposits reduce the capacity of the rising mains. The profile and flow conditions in the
main should ensure that sediment build-up does not occur. If sediment build up cannot be
prevented, provision should be made for appropriate maintenance activities for its removal. If
cleaning is to be carried out by pigging then provision should be made for insertion and removal of
the pig.
d) Where air valves or washout valves are provided the route shall ensure that appropriate access can
be provided to the locations where valve chambers are required for operations and maintenance
purposes and at locations where pigs are to be inserted or removed (see EN 16932-1:2018, 9.5.2).
e) Where air valves, washout valves and discharge points are in proximity to occupied buildings or are
in another location that can cause nuisance, the provision of means for control of odour and noise
should be considered.
7 Hydraulic design of pumping systems
7.1 Introduction
The performance of a pump and its associated rising main are interrelated. The basic hydraulic design
of the pumping station and of the rising main shall therefore be considered together.
The hydraulic design process is illustrated in Figure 5.
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