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API Recommended Configurations

The stack composition depends on the pressures which the BOPs will be expected to cope with (i. e. the working pressures). The API publishes a set of recommended stack configurations but leaves the selection of the most appropriate configuration to the operator.

An example of the API code (API RP 53) for describing the stack arrangement is (Figure 31):

5M — 13 5/8" — RSRdAG

where,

5M refers to the working pressure = 5000 psi

13 5/8" is the diameter of the vertical bore

RSRdAG is the order of components from the bottom up

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API Recommended Configurations

Figure 29 Killing through kill line

API Recommended Configurations

and where,

G

= rotating BOP for gas/air drilling

A

= annular preventer

Rd

= double ram-type preventer

S

= drilling spool

R

= single ram-type preventer

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BOP stacks are generally classified in terms of their pressure rating. The following BOP stack arrangements are examples of those commonly used and given in API RP 53:

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