Otto Graf GmbH

Carat XXL underground tank

The Carat XXL underground tank has been specially developed for rainwater harvesting and for use as a retention cistern, firefighting water tank, process water tank and septic tank. It is available in sizes from 16,000 to 122,000 l. Suitable for vehicle loading / lorry loading.

Flexibility and stability are perfectly combined.
Suitable for vehicle loading / lorry loading
Dome opening with stainless steel profile for precision fit and secure mounting
No need for heavy load transport on trucks up to the size of 76,000 ltrs
Lorry bearing up to 40 t
Groundwater-stable
Lighter than equal tank made of concrete or steel
Numerous DN 100/150/200 connection surfaces
Optional DN 300 connection
Optional second tank dome

Specification

Carat XXL underground tank (16000 litres to 122000 litres) for rainwater harvesting.

40t (SLW40) passable.

Up to 16,000 litres seamlessly manufactured from one piece.

Made of high-quality polyethylene (PE) 100% recyclable.

Dome opening with rotated stainless steel ring - patented - for extreme stability as well as highest fitting
accuracy and assembly safety.

Large entrance dome (360° rotatable) according to DIN 1989.

Access opening Ø 800/650 mm, H = 610 mm. Optional production with second tank dome possible.

Sealed up to the top edge of the terrain in connection with telescopic dome shaft and profile seal.

Up to 76,000 litres volume can be transported without special transport.

Connection options: DN 100/ DN 150/ DN 200
Larger connection pipes on request

Fabricate: GRAF Carat XXL underground tank

Volume [l]	Length [mm]	Width [mm]	Height [mm]	Weight [kg]
16000	4590	2500	3160	770
22000	6230	2500	3160	1025
26000	7200	2500	3160	1125
32000	8555	2500	3160	1370
36000	9525	2500	3160	1470
42000	10880	2500	3160	1715
46000	11850	2500	3160	1815
52000	13205	2500	3160	2060
56000	14175	2500	3160	2160
62000	15530	2500	3160	2405
66000	16500	2500	3160	2505
72000	17855	2500	3160	2750
76000	18825	2500	3160	2850
82000	20180	2500	3160	3095
86000	21150	2500	3160	3195
92000	22505	2500	3160	3440
96000	23475	2500	3160	3540
102000	24830	2500	3160	3785
106000	25800	2500	3160	3885
112000	27155	2500	3160	4130
116000	28125	2500	3160	4230
122000	29480	2500	3160	4475

Technical specification

Unique ref.carat-xxl-underground-tank
TypeObject (single object)
Date of publishing2026-03-19
Edition number1

Links

Product urlhttps://www.graf.info/en/rainwater-harvesting/tanks-underground/rainwater-tank-carat-s/carat-xxl-underground-tank.html
Tendering informationhttps://www.graf.info/en/download/sizing-form-tender-file.html

Classification

BIMobject CategoryEngineering & Infrastructure - Water

Region availability

Europe	Asia	North America	Africa	South America	Oceania
Åland Islands	Afghanistan	Anguilla	Algeria	Argentina	American Samoa
Albania	Armenia	Antigua and Barbuda	Angola	Bolivia	Australia
Andorra	Azerbaijan	Aruba	Benin	Brazil	Cook Islands
Austria	Bahrain	Barbados	Botswana	Chile	Federated States of Micronesia
Belarus	Bangladesh	Belize	Burkina Faso	Colombia	Fiji
Belgium	Bhutan	Bermuda	Burundi	Ecuador	French Polynesia
Bosnia and Herzegovina	British Indian Ocean Territory	British Virgin Islands	Cameroon	Falkland Islands (Islas Malvinas)	Guam
Bulgaria	Brunei	Canada	Cape Verde	French Guiana	Kiribati
Croatia	Cambodia	Caribbean Netherlands	Central African Republic	Guyana	Marshall Islands
Cyprus	China	Cayman Islands	Chad	Paraguay	Nauru
Czech Republic	Christmas Island	Collectivity of Saint Martin	Comoros	Peru	New Caledonia
Denmark	Cocos (Keeling) Islands	Costa Rica	Côte d'Ivoire	Suriname	New Zealand
Estonia	Georgia	Cuba	Democratic Republic of the Congo	Uruguay	Niue
Faroe Islands	Hong Kong	Curaçao	Djibouti	Venezuela	Norfolk Island
Finland	India	Dominica	Egypt		Northern Mariana Islands
France	Indonesia	Dominican Republic	Equatorial Guinea		Palau
Germany	Iran	El Salvador	Eritrea		Papua New Guinea
Gibraltar	Iraq	Greenland	Eswatini		Pitcairn Islands
Greece	Israel	Grenada	Ethiopia		Samoa
Guernsey	Japan	Guadeloupe	Gabon		Solomon Islands
Hungary	Jordan	Guatemala	Ghana		Timor-Leste
Iceland	Kazakhstan	Haiti	Guinea		Tokelau
Ireland	Kuwait	Honduras	Guinea-Bissau		Tonga
Isle of Man	Kyrgyzstan	Jamaica	Kenya		Tuvalu
Italy	Laos	Martinique	Lesotho		United States Minor Outlying Islands
Jersey	Lebanon	Mexico	Liberia		Vanuatu
Latvia	Macau	Montserrat	Libya		Wallis and Futuna
Liechtenstein	Malaysia	Nicaragua	Madagascar
Lithuania	Maldives	Panama	Malawi
Luxembourg	Mongolia	Puerto Rico	Mali
Malta	Myanmar (Burma)	Saint Kitts and Nevis	Mauritania
Moldova	Nepal	Saint Lucia	Mauritius
Monaco	North Korea	Saint Pierre and Miquelon	Mayotte
Montenegro	Oman	Saint Vincent and the Grenadines	Morocco
Netherlands	Pakistan	Saint-Barthélemy	Mozambique
North Macedonia	Palestine	Sint Maarten	Namibia
Norway	Philippines	The Bahamas	Niger
Poland	Qatar	Trinidad and Tobago	Nigeria
Portugal	Saudi Arabia	Turks and Caicos Islands	Republic of the Congo
Romania	Singapore	U.S. Virgin Islands	Reunion
Russia	South Korea	United States	Rwanda
San Marino	Sri Lanka		Saint Helena
Serbia	Syria		São Tomé and Príncipe
Slovakia	Taiwan		Senegal
Slovenia	Tajikistan		Seychelles
Spain	Thailand		Sierra Leone
Svalbard and Jan Mayen	Türkiye		Somalia
Sweden	Turkmenistan		South Africa
Switzerland	United Arab Emirates		South Sudan
Ukraine	Uzbekistan		Sudan
United Kingdom	Vietnam		Tanzania
Vatican City	Yemen		The Gambia
			Togo
			Tunisia
			Uganda
			Western Sahara
			Zambia
			Zimbabwe

Carat XXL underground tank

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