API SPEC 10A:2010 pdf free download.Specification for Cements and Materials for Well Cementing
4 Requirements
4.1 Specification, chemical and physical requirements
4.1.1 Classes and grades
4.1.1.1 General Well cement shall be specified using classes A, B, C, D, G and H and the grades: ordinary (O), moderate sulfate- resistant (MSR) and high sulfate-resistant (HSR). A well cement that has been manufactured and supplied in accordance with this part of ISO 10426 may be mixed and placed in the field using water ratios or additives at the user’s discretion. It is not intended that manufacturing compliance with this part of ISO 10426 be based on such field conditions. Processing additives, set modifying agents or chemical additives used to reduce chromium (VI) shall not prevent a well cement from performing its intended functions.
4.1.1.2 Class A This product is obtained by grinding clinker, consisting essentially of hydraulic calcium silicates, usually containing one or more forms of calcium sulfate as an interground additive. At the option of the manufacturer, processing additives may be used in the manufacture of class A cement, provided that such materials in the amounts used have been shown to meet the requirements of ASTM C465. This product is intended for use when special properties are not required and is available only in O grade, similar to ASTM C150, type I.
4.1.1.3 Class B This product is obtained by grinding clinker, consisting essentially of hydraulic calcium silicates, usually containing one or more forms of calcium sulfate as an interground additive. At the option of the manufacturer, processing additives may be used in the manufacture of class B cement, provided that such materials in the amounts used have been shown to meet the requirements of ASTM C465. This product is intended for use when conditions require moderate or high sulfate resistance and is available in both MSR and HSR grades, similar to ASTM C150, type II.
4.1.1.4 Class C This product is obtained by grinding clinker, consisting essentially of hydraulic calcium silicates, usually containing one or more forms of calcium sulfate as an interground additive. At the option of the manufacturer, processing additives may be used in the manufacture of class C cement, provided that such materials in the amounts used have been shown to meet the requirements of ASTM C465. This product is intended for use when conditions require high, early strength and is available in O, MSR and HSR grades, similar to ASTM C150, type III.
4.1.1.5 Class D This product is obtained by grinding clinker, consisting essentially of hydraulic calcium silicates, usually containing one or more forms of calcium sulfate as an interground additive. At the option of the manufacturer, processing additives may be used in the manufacture of class D cement, provided that such materials in the amounts used have been shown to meet the requirements of ASTM C465. Further, at the option of the manufacturer, suitable set-modifying agents may be interground or blended during manufacture. This product is intended for use under conditions of moderately high temperatures and pressures and is available in MSR and HSR grades.
4.1.1.6 Class G This product is obtained by grinding clinker, consisting essentially of hydraulic calcium silicates, usually containing one or more forms of calcium sulfate as an interground additive. No additives other than calcium sulfate or water, or both, shall be interground or blended with the clinker during manufacture of class G well cement. Chemical additives, as required for chromium(VI) reduction, are permitted, provided that such additives do not prevent the well cement from performing its intended purpose. This product is intended for use as a basic well cement and is available in MSR and HSR grades.
4.1.1.7 Class H This product is obtained by grinding clinker, consisting essentially of hydraulic calcium silicates, usually containing one or more forms of calcium sulfate as an interground additive. No additives other than calcium sulfate or water, or both, shall be interground or blended with the clinker during manufacture of class H well cement. Chemical additives, as required for chromium(VI) reduction, are permitted, provided that such additives do not prevent the well cement from performing its intended purpose.API SPEC 10A pdf download.API SPEC 10A:2010 pdf free download
