Manhole and Soakaway Components

Sizes

Nominal Diameter (mm)	Actual Internal Diameter (mm)	Wall Thickness (mm)	Manhole Dept (mm)							Approx Weight / metre(kg)
			250	500	750	1000	500	750	1000
900	914	70								490
1050	1067	75								644
1200	1219	90								852
1350	1372	100	-							1118
1500	1524	100	-							1289
1800	1800	115	-							1695
2100	2100	125	-							2150
2400	2400	130	-							2553
2700	2700	140	-							3051
3000	3000	160	-							3820
*4000	4000	200	-		-		-	-	-	6440

*4000 ring supplied in 2 halves of 3220kg/m depth.
All manholes from DN 1050 to DN 3000 are available with or without double steps fitted.

Perforation Detail for Soakaways

Nominal Depth	900	1050	1200	1350	1500	1800	2100	2400	2700	300
500	6	6	7	8	9	12	11	13	15	17
750	8	10	12	12	14	16	23	27	30	34
1000	12	12	14	16	18	21	23	27	30	34

View Soakaway Design

Chamber Ring Capacity

Nominal Internal Dimeter
	900	1050	1200	1350	1500	1800	2100	2400	2700	3000	4000
Litres/metre depth of chamber ring	656	894	1167	1478	1824	2544	3464	4524	5725	7069	12566

1Litre = 0.001m³
Note: Joints for Soakaways should be made with cement mortor to ensure even bedding of the units, but need not be watertight.

Cover and Reducing Slabs

Important: The following table shows the size and position of access to comply with current Health and Safety Guidelines under the Confined Spaces Regulations 1997.

Summary of Requirements – Position and sizes of access

Shaft/Chamber Size DN	Manhole less than 1.5m deep cover level to pipe soffit (mm)	Manhole greater than or equal to 1.5m deep cover level to pipe soffit (mm)
900	600 x 600 central	600 x 600 central
1050	750 x 750 central	600 x 600 central
1200	750 x 600 eccentric	*750 x 600 eccentric
1350 - 1500	1200 x 675 central	*750 x 600 eccentric
1800 - 3000	1200 x 675 eccentric	*750 x 600 eccentric
4000		900 x 600

*These sizes are to provide a 600 x 600 access when used in combination with one Type 1 and one or two Type 2 cover frame seating rings depending on depth to make up.

Other sizes access are available to order (Non BS Standard). DN 1350-1 for less than 1.5m depth. DN 1350-2 for greater than equal to 1.5m depth.

Cover Slab

Diameter (mm)	900	1050	1200	1350-1	1350-2	1500	1800	2100	2400	2700	3000	4000
Effective Depth (mm)	125	125	125	150	125	150	150	165	165	180	200	275
Nom Wt (kg)	163	253	317	635	503	759	1113	1645	2163	2998	4164	9900*

*DN 4000 supplied in two halves

Reducing Slabs

(250mm deep no step for ladders or with double step fitted)

Note: Reducing slabs reduce to a 1200 shaft. It is recommended that manholes of up to and including DN 1500mm continue to ground level and do not reduce in diameter but continue in the specified diameter for the whole construction.

Diameter (mm)	1800	2100	2400	2700	3000	4000
Approx Wt (kg)	1371	1934	2678	3543	4569	9420

*DN 4000 supplied in two halves, effective depth 275mm.

Landing Slabs

(Access size 900mm diameter)

Diameter (mm)	1500	1800	2100	2400	2700	3000	4000
Effective Depth (mm)	150	150	165	165	180	200	165
Nom Wt (kg)	710	1060	1590	2110	2940	4100	4750

*Other access diameters are available to order.

All cover slabs, reducing slabs and landing slabs are Type 2 internal register except the DN 1350 cover slab with the 1200 x 675 access and the DN 4000 landing slab which is available as a half landing slab or a full slab supplied in two halves.

Cover Frame Seating Ring

Access Size (mm)	Thickness (mm)	Nom Wt (kg)	No Pallet
Type 1 (eccentric)	600 x 600	65	414	10
Type 2	600 x 600	65	73	15

600 x 600 cover and frame to BS EN 124
Type 2 cover frame seating ring with 600 x 600 central access hole
Type 1 cover frame seating ring with 600 x 600 eccentric access hole positioned to align with double steps

Four additional cover frame seating rings with 1200 x 675 access, 750 x 750, 750 x 600 and 675 x 675 access are available but not included in BS 5911-200

Jointing

Tongue and groove joint provided can be sealed using a joint can be made using Miljoint butyl resin sealent available from Milton Pipes.

View Miljoint Sealant