API STD 53 pdf free download

API STD 53 pdf free download.Well Control Equipment Systems for Drilling Wells.
4.1.2.2 After the classification of the BOP stack has been identified, the next nomenclature identifies the quantity of annular-type preventers installed and designated by an alphanumeric designation (e.g. A2 identifies that two annular preventers are installed). 4.1.2.3 The final alphanumeric designation shall be assigned to the quantity of rams or ram cavities, regardless of their use, installed in the BOP stack. The rams or ram cavities shall be designated with an “R” followed by the numeric quantity of rams or ram cavities. (e.g. R4 designates that four ram-type preventers are installed). NOTE For example, a Class 6 BOP stack installed with two annular-type and four ram-type preventers is designated as “Class 6-A2-R4”. 4.1.3 Adapter/Spacer Spools 4.1.3.1 Spacer spools may be used to allow additional space between preventers to facilitate stripping, hang off, and/or shear operations, but can serve other purposes in a stack as well. 4.1.3.2 Adapter/spacer spools shall: a) Have a minimum vertical bore diameter equal to the internal diameter of the mating equipment; b) Have an RWP (rated working pressure) equal to or greater than the lowest RWP of the mating equipment; c) Have no penetrations capable of exposing the wellbore to the environment. 4.1.4 Drilling Spools 4.1.4.1 Choke and kill lines may be connected either to side outlets of the BOPs or to a drilling spool installed below at least one BOP capable of closing on pipe. NOTE Utilization of the ram-type BOP side outlets reduces the number of stack connections and overall BOP stack height. However, a drilling spool may be used to provide stack outlets (to localize possible erosion in the dispensable spool) and to allow additional space between preventers to facilitate stripping, hang off, and/or shear operations. 4.1.4.2 Drilling spools for BOP stacks shall meet the following minimum requirements: a) For pressure-rated arrangements of 3K and 5K, have two side outlets no smaller than a 2 in. (5.08 cm) nominal size. b) For pressure-rated arrangements of 10K and greater, have two side outlets—one 3 in. (7.62 cm) nominal size as a minimum and one 2 in. (5.08 cm) nominal size as a minimum. C) Have a vertical bore diameter equal to the internal diameter of the mating BOPs and at least equal to the maximum bore of the uppermost wellhead or wellhead assembly. d) Have an RWP equal to the RWP of the installed ram BOP above the spool. 4.1.4.3 For drilling operations, wellhead or wellhead assembly outlets shall not be employed for choke or kill lines. 4.2 Choke and Kill Equipment 4.2.1 Specifications for Choke and Kill Equipment 4.2.1.1 Choke and kill equipment shall be in accordance with the edition of API 1 6C that was in effect at the time of manufacture. The latest edition should be used for modifications, remanufactured equipment, or replacement equipment.4.2.1.2 Modifications, alterations, or adjustments from the original design or intent of the choke and kill system shall be documented through the use of the equipment owner’s MOC system. Choke and Kill General 4.2.2.1 Choke and kill interconnect piping and piping downstream of the choke manifold shall be supported in accordance with ASME B31 .3. 4.2.2.2 Materials used in construction and installation shall be suitable for the expected service, in accordance with API 1 6C. 4.2.2.3 Choke and kill equipment shall meet the area classification requirements for the area in which it is installed. NOTE See API 500 and API 505 for information on area classification.API STD 53 pdf download.