This document proposes a private standard for the dimensions of a special ductile iron manhole cover. It would standardize the dimensions for covers with a diameter of 650mm/25.80in and loading classes of 360kN or 400kN. The standard aims to be consistent with regional standards like EN124, which do not specify dimensions for special products. It provides detailed drawings and specifications for the cover dimensions, including the lid, frame, openings, and reinforcement ribs. The standard would help standardize covers for water, sewer, and stormwater networks in vehicular areas.

1. A PROPOSAL ON THE SUBJECT OF PRIVATE STANDARDIZATION
THE SUBJECT OF PRIVATE STANDARD DEVELOPMENT
Date of proposal: Secretariat of Organization
TCs WGs
Author of proposal:
THE PROPOSAL
Title of proposal:
"Dimensions of special product of vehicular area manhole cover, of round opening, of ductile iron
construction, rated size - DN.650mm or 25.80in (D.650/655), and 360 or 400 kN loading class."
Material: - ductile iron - of grade to fit the loading class in compliance with thicknesses of pieces.
The proposal comes to settle up a dimensional based private standard normative document (as case, a
publication/deliverable) concerning the dimensions of a special product of a street manhole cover - in order
to be in concordance with requirements of one or more regional basic standard(s) of cast/ductile iron
manhole covers, - e.g. the regional CEN standard "EN124 - Gully tops and manhole tops for vehicular and
pedestrian areas. Design requirements, type testing, marking, quality control", - or, with other basic
standard concerning street, or residential area, manhole covers - as long as the basic standard (e.g. as the
EN124 is) does not apply for dimensions of special products of manhole covers.
As conclusion, the proposed private standard document (norm) aims to specify the main dimensions for a
special product of a ductile iron vehicular area manhole cover of a DN.650mm / 25.80in, rated dia. of
round opening; - and must, as case may be, completed with other standards which refers to testing,
marking, quality control. (e.g. the EN124 CEN standard).
Short description of design related to product and main dimensions:
= Round (circular) frame with round opening;
- overall dia. of lid piece: 650mm (25.625in),
- top opening of frame: dia. 655 (25.75in), - round,
- top dia. of frame: 700mm, (27.5625in), - round,
- lower (inner) opening of base of frame,
dia. 610mm (24in); 685mm (27in); 710mm (28in), 765mm (30.125in), 825mm (32.50"),
> to fit a manhole top opening (entry) of dia. 600mm (24in), 27in, 700mm (28in), 750mm (30in), 800mm (32in)
- clearance (clear opening) of frame, - about 600mm (23.625in),
- 4 vent/key holes of about 40sq.cm. (~6.20sq.in) at all clear opening;
which also allows an easy opening using common tools,
- optional, on designs of lid and frame - a hinge or locking system may be added.
The product which the subject of standardization consists in, may be useful for outdoor networks - water
supply, as well sewerage chambers or storm water, - in vehicular areas.
The type of public standard document, as possible the proposal may later transform into:
> concerning the terminology of EN45020:2006 description: - prestandard (3.3), product standard (5.4),
technical specification (3.4), unilaterally aligned standard (6.8), - all of these, in order to complete with
CEN standard EN124, which is a basic standard (5.1).
> concerning the terminology of ISO/CEI-2:2004: - international standard (3.3), technical specification
(3.4), technical report (3.5), publicly available specification (3.7).

2. LID PIECE of D.650/655
Front side view
- Anti-skid pattern details
Loading class: 360 kN ; 400 kN
; D.655/660
( 650 rated dia.)
LID PIECE of D.650/655 ; D.655/660
( 650 rated dia.) Front side view
- Anti-skid pattern details
Loading class: 360 kN ; 400 kN
00 99
1818
O.D. (Overall dia.) 650 (25.625”)O.D. (Overall dia.) 650 (25.625”)
O 540 (21.25”)O 540 (21.25”)
O 388 (15.25”)O 388 (15.25”)
O 312 (12.25”)O 312 (12.25”)
O 464 (18.25”)O 464 (18.25”)
2
5
.
5
3
(9
2
”)
2
5
.
5
3
(9
2
”)
Ddohc - 195 ( 7.75”) > distance in-between opposite holes centres
A - A > the effective section (without behind parts) throw the lower part of lid,
those which contains the lid plate as well the ribs, but not contains the anti-skid pattern.
A1 - A1 > the effective section (rabbated throw A-A line) only of the upper part of lid,
those which contains the anti-skid pattern.
Holes are a at 90 degree, each to sequent other,
- and have a clearance of 30 (1.1875), 32 (1.25”), 35 (1.375”).
Ddohc - 195 ( 7.75”) > distance in-between opposite holes centres
A - A > the effective section (without behind parts) throw the lower part of lid,
those which contains the lid plate as well the ribs, but not contains the anti-skid pattern.
A1 - A1 > the effective section (rabbated throw A-A line) only of the upper part of lid,
those which contains the anti-skid pattern.
Holes are a at 90 degree, each to sequent other,
- and have a clearance of 30 (1.1875), 32 (1.25”), 35 (1.375”).
A1A1
A1A1
AA AA
Top level of lid
and trunks
Top level of lid
and trunks
Top level of
lid plate and
base of trunks
Top level of
lid plate and
base of trunks
240/244
base/top
240/244
base/top
608/612 top/base608/612 top/base
Cd 145/148
(5.6875”/5.8125”)
Cd 145/148
(5.6875”/5.8125”)
Ddohc 190dohc 190
INSCR IPTION
RESERVED
AREA
INSCR IPTION
RESERVED
AREA

4. overall dia. O 650 (25.625”)overall dia. O 650 (25.625”)
OO
OO
OO
OO
OO
OO
OO
LID Piece of D.650/655 Front side plane view
- anti-slip/skid pattern details
(vented lid)
Loading class, - 360 ; 400 kN
LID Piece of D.650/655 Front side plane view
- anti-slip/skid pattern details
(vented lid)
Loading class, - 360 ; 400 kN
O 620 - fictive circle of base of trunks tangentO 620 - fictive circle of base of trunks tangent
2-atbaseO~47
(75”9.)
2-atbaseO~47
(75”9.)
35/38
(1. 75”/1.5”
3
)
35/38
(1. 75”/1.5”
3
)
38/41
/1(1.5”.625”)
38/41
/1(1.5”.625”)
32/35
(1.25”/1.375”)
32/35
(1.25”/1.375”)
Ttop/baseTtop/base
Aanti-skid
pattern
trunks
Aanti-skid
pattern
trunks
attop1
5
5
3
3553153155
3
2312
38
81
8
3812
e
atbas
AAattop1
5
5
3
3553153155
3
2312
38
81
8
3812
e
atbas
/O145148/O145148 5050
cens tk en ru srt ;fo 3e 6lc tri ruc ne kv sit pci ef r5
r
8
ow
5
,
O
at~51mm(2”)eachtosequentone
cens tk en ru srt ;fo 3e 6lc tri ruc ne kv sit pci ef r5
r
8
ow
5
,
O
at~51mm(2”)eachtosequentone
(1.96875”)
”)521.91
3
(
0 t
5
ru
8
n
4
k
s
O
perrow,-atabout50.8mm
(2”)
”)521.91
3
(
0 t
5
ru
8
n
4
k
s
O
perrow,-atabout50.8mm
(2”)
83 5O ; 24 trunk
sperrow;atabout5
0.4
mm
83 5O ; 24 trunk
sperrow;atabout5
0.4
mm
OO OO
; 1858 tr2 unO ks
perrowatabout49,7m
m
; 1858 tr2 unO ks
perrowatabout49,7m
m
Ddohc 195
(7.75 ”)
dohc 195
(7.75 ”)
Trunk
Ddohc - 195 ( 7.75”) > distance in-between opposite holes centres
A - A > the effective section (without behind parts) throw the lower part of lid,
those which contains the lid plate as well the ribs, but not contains the anti-skid pattern.
A1 - A1 > the effective section (rabbated throw A-A line) only of the upper part of lid,
those which contains the anti-skid pattern.
Holes are a at 90 degree, each to sequent other,
- and have a clearance of 30 (1.1875), 32 (1.25”), 35 (1.375”).
Ddohc - 195 ( 7.75”) > distance in-between opposite holes centres
A - A > the effective section (without behind parts) throw the lower part of lid,
those which contains the lid plate as well the ribs, but not contains the anti-skid pattern.
A1 - A1 > the effective section (rabbated throw A-A line) only of the upper part of lid,
those which contains the anti-skid pattern.
Holes are a at 90 degree, each to sequent other,
- and have a clearance of 30 (1.1875), 32 (1.25”), 35 (1.375”).
A1A1
A1A1
AA
AA

6. LID PIECE of D.650/655 Front side plane view - Solid lid
- details of anti-skid pattern
- Loading class: 360; 400 kN
LID PIECE of D.650/655 Front side plane view - Solid lid
- L
- details of anti-skid pattern
oading class: 360; 400 kN
Overall dia. 650 ( 25.625”)Overall dia. 650 ( 25.625”)
Base level
of ribs, and
top level of
structure
Base level
of ribs, and
top level of
structure
Top
level
of lid
Top
level
of lid
A
A1
A
A1
A - A > the effective section (without behind parts) throw the lower part of lid,
those which contains the lid plate as well the ribs, but not contains the anti-skid pattern.
A1 - A1 > the effective section (rabbated throw A-A line) only of the upper part of lid,
those which contains the anti-skid pattern.
A - A > the effective section (without behind parts) throw the lower part of lid,
those which contains the lid plate as well the ribs, but not contains the anti-skid pattern.
A1 - A1 > the effective section (rabbated throw A-A line) only of the upper part of lid,
those which contains the anti-skid pattern.
1414
1616
6262
A
A1
A
A1
310 (5x62)
in-between opposite ribs
310 (5x62)
in-between opposite ribs
EV DRE
S S
E
IT
R
E
NOIT
P I IR NC S
EV DRE
S S
E
IT
R
E
NOIT
P I IR NC S
6262

8. LID Piece D.650/655 Plane view of backside
Loading class , - 360 kN ; 400 kN
LID Piece D.650/655 Plane view of backside
Loading class , - 360 kN ; 400 kN
O 125O 125
Ddohc 195Ddohc 195
O 575 central axe of ribO 575 central axe of rib
Overall dia. O 650Overall dia. O 650
Ddohc - distance in-between holes centres.
(Only in case if vent holes exists)
Ddohc - distance in-between holes centres.
(Only in case if vent holes exists)
AA AA

10. 6 reinforcing ribs
at 60 degree
each to other
6 reinforcing ribs
at 60 degree
each to other
FRAME Piece of D.650/655 Top plane view
- Loading class, - 360; 400 kN
FRAME Piece of D.650/655 Top plane view
- Loading class, - 360; 400 kN
Clearance dia. (Clear opening) dia. O 600Clearance dia. (Clear opening) dia. O 600
Top opening dia. O 655 (25.75”)Top opening dia. O 655 (25.75”)
Top outer dia. O 690; 700Top outer dia. O 690; 700
AA
AA
Overall dia. ( at base) O 730; 750; 800; 850; 900; 925; 950AOverall dia. (Aat base) O 730; 750; 800; 850; 900; 925; 950

11. Clearance dia. O 600Clearance dia. O 600
Reinforcing
ribs/blocks
Reinforcing
ribs/blocks
FRAME Piece of D.650/655 Below part plane view
- Loading class, - 360; 400 kN
FRAME Piece of D.650/655 Below part plane view
- Loading class, - 360; 400 kN
AA
AA
Overall dia. 730; 750; 800; 850; 900; 925; 950Overall dia. 730; 750; 800; 850; 900; 925; 950