A). Adsorb H₂S gases with a minimum 98% efficiency at the average H₂S  concentrationand  95%   at                                   the maximum H₂S concentration based on data given under equipment schedule.

B). Provide vertical single or double bed adsorber(s),complete with supporting screens, nozzles,valves,               gauges, piping, and controls as specified.

C). Provide materials resistant to corrosive action of 10 percent sulphuric acid solution in water.
D). Provide NEMA 4X, electrical components.
E). Adsorber Vessel Materials: Filament wound construction, fibre glass reinforced thermosetting

 1). Fabricate adsorber vessel of vinylester resin.

2). Provide corrosion barrier and inner surface cured with dimethylaniline-benzoyle peroxide cure system.

3). Provide clear ultra-violet absorbers in final resin coats; do not paint.

4). Make inner surface a minimum of 0.5 mm thick applied in a minimum of 2 layers with a resin content of not less than 90 percent with a synthetic polyester surfacing veil.

5). Make corrosion barrier a minimum of 2.5mm  thick applied in a minimum resin content of 75 percent. Apply glass in a labyrinth pattern.

6). Interior and exterior  layers to  achieve  structural requirements of adsorber with a resin content of not less than 65 percent.

7). Provide outer  surface  of adsorber with  an  application  of resin rich coating of 0.5 mm thick having a resin content of not less than 90 percent, use “C” glass veil.

8). For glass in structural portion of adsorber, apply alternate layers of resin saturated woven roving and chopped glass mat. Apply non-continuous glass strands using fibres of a maximum of 50 mm.

9). Laminate reinforcing shapes and members as a primary bond. Secondary bonding is not acceptable.

10). Water Supply to Adsorber vessel: Fresh Water 11). Provide adsorber with a bed or beds  of activated  carbon  arranged  between meshed  screens to prevent bed fluidisation. 12). Support adsorber’s bed(s) with plastic grating of at least 70 percent open area. Do not use laminated wood or other laminated materials inside adsorber. Provide grating and supports for full bed depth under all condition conditions of operation, including flooding. 13). Flange and gasket all  access/inspection hatches. Do  not use  laminated or encapsulated bolts an fasteners. Bolts and fasteners to be replaceable. 14). All nozzle fittings: Flanged, one-piece, contact-moulded construction.Pressure taps:threaded CPVC fittings. Face and drill flanges to ISD PN6 Standard. Project flanges 150mm from adsorber surface and  reinforce with conical gusseting or four-bonded gusset plates, which extend to outside edge of flanges. 15). Provide adsorber vessel equipped with inspection hatch if applicable, water connection nozzle,drain and overflow nozzles, pressure gauge taps, air inlet and outlet connections. 16). Design adsorber to withstand full range of vacuum or pressure conditions,but not less than 3000 Pa. 17). Provide adsorber equipped with anchor pads and lifting lugs for field erection. 18). Gasketing and Sealing: a) Make sealing methods and materials resistant to adsorber gases and solutions. b) Provide manufacturer’s standard girth flange gaskets for adsorber. c) Flanged nozzles: Viton or hypalon full-face gaskets of 50 to 60 Shore “A” Durometer hardness. d) Fabricated gaskets: Machine-made or die-stamped with inside and outside edges parallel or concentric, as applicable. Oversize bolt holes to prevent crimping of gasket when installed.

E. Nozzles and appurtenances shall include as a minimum
1). Make-up water inlet.
2). Overflow equipped with transparent sight glass
3). Scrubber liquor recirculation inlet (to spray header)
4). Scrubber liquor recirculation outlet (to pump suction).
5). pH probe mounting.
6). ORP probe mounting.
7). Level sensor/ transmitter mounting connections with stilling well.
8). A minimum of three manholes with neoprene gaskets(for servicing spray nozzle,packed bed and for
for scrubber sump)
9). Hydrochloric acid supply connection.
10). Four GRP tie down lugs or base flange.
11). Mounting brackets for scrubber recirculation piping.
12). GRP ladder and working platform as shown on drawings.
13). Sight glass with suitable PVC isolation valves,to monitor visually the sumpliquid level.
14). Liquid sampling valve

F. The scrubber tower shall be capable of operating at the design flow rate with a maximum total static pressure loss of 75 mm water column. The packing depth,recirculation rate, and recirculation solution shall be designed to meet the specified removal efficiency.
G. An internal entrainment separator section of corrosion resistant construction shall be furnished with each tower.The separator shall be designed to remove not less than 99 percent of the entrained moisture of the air exiting the scrubber, consistingof droplets 10 microns and larger.

H. Packing support plates for the main bed shall be manufactured from a chemical grade GRP resin,  having 40 mm by 40 mm square openings and 40 mm deep.Packing supportplates,ifrequired, for the entrainment separator section shall be manufactured from injection molded GRP,having a minimum 84 percent open area,or same as above. Any internal supports required shall be of the same material  as the shell.

I.The scrubbing liquid distribution system shall be the spray type of manufacturer’sstandard design, sized for the flow rates required to meet the performance requirements of this specification and taking into account varying air delivery rates of + 10%. No liquidre- distributors shall be permitted.Spray headers shall beplaced at the manufacturer’s recommend distance above the packing. Material of  construction shall be Schedule 80 PVC or other approved material for the scrubber service conditions.

J. The scrubber shall be designed with an integral sump to supply scrubbing solution to the recirculation pumps. Design of this sump shall be to hold a minimum of two minutes supply of scrubbing liquid.Proper allowance for low level shutdown of the recirculation pumps and high level alarms shall be provided in designing of the sump height. The sump shall be furnished with a level sensor as specified herein.

K.No internal wetted metal bolts and fasteners are permitted.All external bolts,fasteners including anchor bolts and flanged bolts shall be type 316 stainless steel.Stainless steel anchor bolts and clips shall be provided by the manufacturer.

L. The scrubber shall be supplied with integral mounting lugs and pipe supports forthe scrubber liquor recirculation piping. Pipe supports shall be non-metallic,channels and straps.

M. The scrubber shall have pressure taps located below the main packed bed and above the entrainment separator. A manometer type pressure differential gauge shall be provided which shall be calibrated in mm of water column.

Carbon
Adsorber for
Kuwait SE19
Project
4.250m dia.x
6.0m Height.