13.1 GENERAL
These clauses shall be read in continuation of Section 1 of this specification.
13.1.1 All surface boxes and manhole covers shall be manufactured from ductile iron in accordance with BS-5834, Part 2 Grade A or EN 124, Class D-400 heavy duty or equivalent as specified.
13.1.2 All surface boxes and manhole covers shall be coated with a cold applied black bitumen solution in accordance with BS-3416.
13.1.3 All surface boxes and manhole covers shall be kite marked or a BIS Certificate of compliance with the relative standard must be supplied with all deliveries.
13.1.4 All surface boxes and manhole covers shall have open keyways and prising slot in frame.
13.1.5 Lifting keys, of malleable cast iron with loop handles or “T” handle as appropriate suitable for all surfaces box and manhole covers and shall be supplied One (1) set per Twenty (20) surface boxes.
13.1.6 All surface boxes and manhole covers shall have a height and depth of raised for recessed pattern, Letters, Symbols and KAHRAMAA logo with minimum of 5mm raised (See Appendix III).
13.1.7 All surface boxes and manhole covers shall have bounding ribs on the base frame.
13.2 GATE VALVE SURFACE BOXES(UP TO300MMØ VALVES)
13.2.1 The SV surface boxes shall be of the square type with a minimum 150 x 150mm clear opening or double triangular loose coupled type, with a nominal 150 x 150mm clear opening to BS 5834, Part 2 Grade A or EN 124, Class D-400 heavy duty or equivalent as specified.
13.2.2 The covers of the SV surface boxes shall have open keyways and prising slot in frame.
13.2.3 The covers of SV surface boxes are to have in the casting the letters ‘SV’ and Water/W with a minimum height of 25mm and the raised as per clause 13.1.6.
13.2.4 The covers of the SV surface boxes shall be fitted with security chains.
13.2.5 The SV surface box shall have KAHRAMAA Logo for identification and the raised as per clause 13.1.6.
13.3 GATE VALVE MANHOLE COVERS(400MMØ VALVES AND ABOVE)
13.3.1 The GV manhole covers shall be of the square type with a minimum 750 x 750mm double triangular type clear opening, and shall conform to BS-5834, Part 2 or EN-124, Class D-400 heavy duty or equivalent as specified.
13.3.2 The covers of the GV manhole covers shall have closed keyways and prising slots in frame.
13.3.3 The covers of GV manhole covers are to have in the casting, the letters ‘GV’ and Water/W with a minimum height of 50mm and the raised as per clause 13.1.6.
13.3.4 The GV manhole covers shall have KAHRAMAA Logo for identification and the raised as per clause 13.1.6.
13.4 AIR VALVE MANHOLE COVERS
13.4.1 The AV manhole covers shall be of the square type with a minimum 750 x 750mm double triangular type clear opening, and shall conform to BS-5834, Part 2 or EN-124, Class D-400 heavy duty or equivalent as specified.
13.4.2 The covers of the AV manhole covers shall have closed keyways and prising slots in frame.
13.4.3 The covers of AV manhole covers are to have in the casting, the letters ‘AV’ and Water/W with a minimum height of 50mm and the raised as per clause 13.1.6.
13.4.4 The AV manhole covers shall have KAHRAMAA Logo for identification and the raised as per clause 13.1.6.
13.5 BUTTERFLY VALVE MANHOLE COVERS
13.5.1 The BV manhole covers shall be of the square type with a minimum 750 x 750mm double triangular type clear opening, and shall conform to BS-5834, Part 2 or EN-124, Class D-400 heavy duty or equivalent as specified.
13.5.2 The covers of the BV manhole covers shall have closed keyways and prising slots in frame.
13.5.3 The covers of BV manhole covers are to have in the casting, the letters ‘BV’ and Water/W with a minimum height of 50mm and the raised as per clause 13.1.6.
13.5.4 The BV manhole covers shall have KAHRAMAA Logo for identification and the raised as per clause 13.1.6.
13.6 STOPCOCK AND FERRULES(SC) SURFACE BOX
13.6.1 The Surface Connection (SC) surface boxes shall be of the square type with a minimum 150 x 150mm clear opening or double triangular loose coupled type, with
a nominal 150 x 150mm clear opening to BS 5834, Part 2 Grade A or EN 124, Class D-400 heavy duty or equivalent as specified.
13.6.2 The covers of the SC surface boxes shall have open keyways and prising slot in frame.
13.6.3 The covers of SC surface boxes are to have in the casting the letters ‘SC’ and Water/W with a minimum height of 25mm and the raised as per clause 13.1.6.
13.6.4 The covers of the SC surface boxes shall be fitted with security chains.
13.6.5 The SC surface box shall have KAHRAMAA Logo for identification and the raised as per clause 13.1.6.
13.7 UNDER GROUND FIRE HYDRANT MANHOLE COVERS
13.7.1 Fire hydrant (FH) manhole covers shall be of the Rectangle type with a minimum 380 x 230mm clear opening and shall conform to BS-5834, Part 2 or EN-124, Class D-400 heavy duty or equivalent as specified.
13.7.2 The covers of the FH manhole covers shall have closed keyways and prising slots in frame.
13.7.3 The covers of FH manhole covers shall have in the casting either the words ‘Fire Hydrant’, in letters 25mm minimum in height or the letters ‘FH’ and Water/W with a minimum height of 50mm and the raised as per clause 13.1.6.
13.7.4 The covers of the FH manhole covers shall be fitted with security chains.
13.7.5 The FH manhole covers shall have KAHRAMAA Logo for identification and the raised as per clause 13.1.6.
13.8 WASHOUT MANHOLE COVERS
13.8.1 The WO manhole covers shall be of the square type with a minimum 750 x 750mm double triangular type clear opening, and shall conform to BS-5834, Part 2 or EN-124, Class D-400 heavy duty or equivalent as specified.
13.8.2 The covers of the WO manhole covers shall have closed keyways and prising slots in frame.
13.8.3 The covers of WO manhole covers are to have in the casting, the letters ‘WO’ and Water/W with a minimum height of 50mm and the raised as per clause 13.1.6.
13.8.4 The BV manhole covers shall have KAHRAMAA Logo for identification and the raised as per clause 13.1.6.
13.9 MARKER POST
13.9.1 Marker post shall be manufactured from steel channel as detailed in the standard drawing
13.9.2 Each post will be supplied with a steel backing plate use for GV, AV and FH, and Each post will be supplied
with:-A) Six (6) Nos. of M-8 x 30mm long counter sunk bolts with hexagon drive.
B) Four (4) Nos. of M-6 x 30mm long slotted round head bolts with nuts and spring washers.
13.9.3 All posts and backing plates are to be grit blasted prior to the application of a suitable three stages epoxy paint system. The color shall be light aircraft gray color Code RAL 7035.
13.9.4 All post & backing plates shall have identification metal strip (i.e. name or logo of the manufacturers).
13.10INDICATOR PLATE
13.10.1 Indicator plates and tiles will be from the ‘F’ range. The Engineer will notify Numbers and letters in Arabic and English to be shown on the tiles.
13.10.2 Fire hydrant plates will have the letter ‘H’ cross and commas be empty of tiles and have a plastic backing plate.
13.10.3 Gate valve and air valve plates will have the Arabic ‘Water’ ‘T’ cross and commas, be empty of tiles and have a plastic backing plate.
13.11 ALUMINUM
INDICATOR PLATE
13.11.1 All aluminum indicator plate shall be designed as per the standard drawing No. NDS-SD-902 (See Appendix III).
13.11.2 Aluminum Plate Thickness: 3mm
13.11.3 Type of Coating: Electro static powder coating
13.11.4 International coating cooler code: RAL 5019 (Blue)/ RAL 3002 (Red) 13.11.5 Coating thickness: 100 micron
13.11.6 Depth of engraved letters: 0.8mm
13.11.7 Coating UV resistance: ASTM G 154 (UVB- 131) cycle at 50C UV and 4 hours at 40C condensation, no chalking, excellent gloss retention & color stability after 1000 hours testing. Series: 1307, Gloss: 77 ±7, Finish: smooth.
13.12PACKING
13.12.1 The packing shall be as per Section 1, Clause 1.8 of this specification.
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