ISO 7186:2011 下水道用ダクタイル鋳鉄製品 | ページ 5

3.1

ductile iron

type of cast iron used for pipes, fittings and accessories in which graphite is present primarily in spheroidal form

[SOURCE:ISO 2531:2009, definition 3.8]

3.2

pipe

casting of uniform bore, with straight axis, having either socket, spigot or flanged ends

Note 1 to entry: This does not apply to flanged sockets, flanged spigots and collars, which are classified as fittings.

[SOURCE:ISO 2531:2009, definition 3.22]

3.3

fitting

casting other than a pipe, which allows pipeline deviation, change of direction or bore

Note 1 to entry: Flanged sockets, flanged spigots and collars are also classified as fittings.

[SOURCE:ISO 2531:2009, definition 3.9]

3.4

accessory

any casting other than a pipe or fitting, which is used in a pipeline

[SOURCE:ISO 2531:2009, definition 3.1]

3.5

inspection chamber

component of a discharge system, of a drain or of a sewer providing access from the ground surface for inspection and maintenance equipment

3.6

manhole

component of a sewer of sufficient size to provide access from the ground surface for inspection and maintenance operations by personnel and equipment

3.7

flange

end of a pipe or fitting, extending perpendicular to its axis, with bolt holes equally spaced on a circle

Note 1 to entry: A flange can be fixed (e.g. integrally cast, screwed-on or welded-on) or adjustable. An adjustable flange comprises a ring, in one or several parts bolted together, which bears on an end joint hub and can be freely rotated around the barrel axis before jointing.

[SOURCE:ISO 2531:2009, definition 3.10]

3.8

spigot

male end of a pipe or fitting

[SOURCE:ISO 2531:2009, definition 3.26]

3.9

spigot end

maximum insertion depth of the spigot, L_i, plus 50 mm

[SOURCE:ISO 2531:2009, definition 3.27]

3.10

socket

female end of a pipe or fitting to make the connection with the spigot of the next component

[SOURCE:ISO 2531:2009, definition 3.25]

3.11

gasket

sealing component of a joint

[SOURCE:ISO 2531:2009, definition 3.13]

3.12

joint

connection between the ends of pipes and/or fittings in which a gasket is used to effect a seal

[SOURCE:ISO 2531:2009, definition 3.15]

3.13

flexible joint

joint providing significant angular deflection and movement parallel and/or perpendicular to the pipe axis

[SOURCE:ISO 2531:2009, definition 3.12]

3.14

push-in flexible joint

flexible joint assembled by pushing the spigot through the gasket into the socket of the mating component

[SOURCE:ISO 2531:2009, definition 3.23]

3.15

mechanical flexible joint

flexible joint in which sealing is obtained by applying pressure to the gasket by mechanical means, e.g. a gland

[SOURCE:ISO 2531:2009, definition 3.18]

3.16

restrained joint

joint in which a means is provided to prevent separation of the assembled joint

[SOURCE:ISO 2531:2009, definition 3.24]

3.17

flanged joint

joint between two flanged ends

[SOURCE:ISO 2531:2009, definition 3.11]

3.18

nominal size

DN

alphanumeric designation of size for components of a pipework system, which is used for reference purposes

Note 1 to entry: It comprises the letters DN followed by a dimensionless whole number, which is indirectly related to the physical size, in millimetres, of the bore or outside diameter of the end connections.

Note 2 to entry: Adapted from ISO 6708:1995, definition 2.1.

3.19

nominal pressure

PN

numerical designation, which is a convenient rounded number, used for reference purposes

Note 1 to entry: All components of the same nominal size, DN, designated by the same PN number have compatible mating dimensions.

Note 2 to entry: Adapted from ISO 7268.

3.20

leaktightness test pressure

pressure applied to a component during manufacturing in order to ensure its leaktightness

3.21

allowable operating pressure

PFA

maximum internal pressure, excluding surge, that a component can safely withstand in permanent service

[SOURCE:ISO 2531:2009, definition 3.2]

3.22

allowable maximum operating pressure

PMA

maximum internal pressure, including surge, which a component can safely withstand in service

Note 1 to entry: Adapted from ISO 2531:2009, definition 3.17.

3.23

allowable site test pressure

PEA

maximum hydrostatic pressure that a newly installed component can withstand for a relatively short duration, when either fixed above ground level or laid and backfilled underground, in order to measure the integrity and tightness of the pipeline

Note 1 to entry: This test pressure is different from the system test pressure which is related to the design pressure of the pipeline.

[SOURCE:ISO 2531:2009, definition 3.3]

3.24

diametral stiffness of a pipe

characteristic of a pipe allowing it to resist diametral deflection under loading

[SOURCE:ISO 2531:2009, definition 3.7]

3.25

discharge system

system of pipes, fittings, accessories and joints used to collect and drain waste water and rainwater from a building

Note 1 to entry: It comprises discharge pipes, stack ventilation pipes and rainwater downpipes, installed within the limits of a building or attached to the building.

3.26

drain

system of pipes, fittings, accessories and joints installed outside the limits of a building in order to connect the discharge system of the building to a sewer or a septic tank

3.27

sewer

pipeline designed to collect waste water and rainwater from buildings and surface water and to convey them to the point of disposal or treatment

3.28

gravity sewer

sewer operating normally under free flowing conditions

3.29

pumping sewer

pressure sewer

sewer (or section of a sewer) operating under positive pressure

3.30

vacuum sewer

sewer operating under negative pressure

3.31

combined sewer

sewer collecting together rainwater, surface water and waste water

3.32

separate sewer system

sewerage system which collects waste water separately from surface water

3.33

batch

quantity of castings from which a sample may be taken for testing purposes during manufacture

[SOURCE:ISO 2531:2009, definition 3.4]

3.34

type test

proof-of-design test, which is done once and is repeated only after change of design

[SOURCE:ISO 2531:2009, definition 3.29]

3.35

laying length

L_e

length by which a pipeline progresses when an additional pipe is installed

Note 1 to entry: For socket and spigot pipes, it is equal to the total length of the pipe, L_tot, minus the maximum spigot insertion depth, L_i, as given by the manufacturer and as shown in Figure 5. For flanged pipes, it is equal to the total length of the pipe.

Note 2 to entry: It is expressed in metres.

Note 3 to entry: Adapted from ISO 2531:2009, definition 3.16.

3.36

standardized length

length of pipe barrel and fitting body or branch

Note 1 to entry: For socket and spigot pipes, it is designated L_u ( l_u for branches). For flanged pipes, and fittings, it is designated L ( l for branches). See Figure 5 and ISO 2531.

Note 2 to entry: For flanged pipes and fittings, the standardized length L ( l for branches) is equal to the total length. For socketed pipes and fittings, the standardized length L_u ( l_u for branches) is equal to the total length minus the depth of socket, as indicated in the manufacturer's handbooks.

Note 3 to entry: Adapted from ISO 2531:2009, definition 3.28

3.37

ovality

out-of-roundness of a pipe section, equal to Equation (1):

(1)

where

A1	is the maximum axis, in millimetres;
A2	is the minimum axis, in millimetres.

[SOURCE:ISO 2531:2009, definition 3.21]

3.38

deviation

amount by which the design length may differ from the standardized length of a pipe or a fitting

Note 1 to entry: Pipes and fittings are designed to a length selected in the range of standard length plus or minus the deviation (see Table 3); they are manufactured to this length plus or minus the tolerance given in Table 4.

Note 2 to entry: Adapted from ISO 2531:2009, definition 3.6.

3.39

component

any product defined as an element of a pipeline, such as a pipe, fitting or accessory

[SOURCE:ISO 2531:2009, definition 3.5]

3.40

hoop stress

σ

stress in a pipe or fitting under pressure, acting tangentially to the perimeter of a transverse section

[SOURCE:ISO 2531:2009, definition 3.14]