api spec 16d - specification for control systems for...

2
Standard Edition Section Inquiry # Question Reply 16D 2nd Edition, July 2004 5.1.2.3 16D-02-12 Referring to API 16D, 5.1.2.3, is it ok for a relief valve to have a by-pass around it for relieving pressure from the system (the bypass does not isolate the relief valve)? A bypass around a relief valve is acceptable as long as it does not defeat the purpose of the relief valve it meets the intent of 5.1.2.3. 16D 2nd Edition, July 2004 5.5.2 16D-01-12 Background: We are in the commissioning stages of the diverter and well control equipment and require a clarification of API 16D, Section 5.5.2. We have a 49-1/2 in. diverter with insert packers for various size pipe; the main diverter packer is 35.5 in. ID. We are currently trying to test and confirm the closing times on a 10 in. bore insert packer installed closing on a 5 in. pipe mandrel. The manufacturer contends that “nominal bore” as stated in API 16D, Section 5.5.2, is defined as the main packer of the diverter, even though the actual bore is reduced to 10 in. due to the insert packer. By this interpretation, they contend that since the diverter main packer is larger than 20 in. and the closing time should be 45 seconds. Question: Since the insert packer is installed and thereby reducing the bore to 10 in., should the “nominal bore” be considered less than 20 in. and the closing time be 30 seconds in accordance with Section 5.5.2? The annular packing element and the insert packer are two different components used for sealing in a diverter, therefore, if an insert packer is used for a specific application, the closing time would still be based on the nominal bore of the annular packing element (i.e., the I.D. before the insert was installed). 16D 2nd Edition, July 2004 5.5.2.1 16D-01-08 In Section 5.2.2.1, what constitutes the “entire accumulator system” in this section for a subsea stack? All surface and subsea bottles are considered in the “entire accumulator system”. However, when and where those bottles are independent and/or assigned to a specific purpose or set of functions (i.e. acoustic, auto shear or deadman) they are not included in the entire accumulator system count. If for some reason they are “shared” they should be counted in the “entire system count”, but if they are in place and only support those specific tasks and not normally used in the day to day operation of the BOPE they are not counted in the “entire accumulator system” count. API Spec 16D - Specification for Control Systems for Drilling Well Control Equipment and Control Systems for Diverter Equipment Last update: January 23, 2013 Page 1 of 2

Upload: hoangtu

Post on 09-Feb-2018

488 views

Category:

Documents


21 download

TRANSCRIPT

Page 1: API Spec 16D - Specification for Control Systems for ...mycommittees.api.org/standards/techinterp/epequip/Shared Document… · Standard Edition Section Inquiry # Question Reply API

Standard Edition Section Inquiry # Question Reply

16D 2nd Edition,

July 2004

5.1.2.3 16D-02-12 Referring to API 16D, 5.1.2.3, is it ok for a relief valve to have a by-pass

around it for relieving pressure from the system (the bypass does not

isolate the relief valve)?

A bypass around a relief valve is acceptable as long as it does

not defeat the purpose of the relief valve it meets the intent of

5.1.2.3.

16D 2nd Edition,

July 2004

5.5.2 16D-01-12 Background: We are in the commissioning stages of the diverter and

well control equipment and require a clarification of API 16D, Section

5.5.2. We have a 49-1/2 in. diverter with insert packers for various size

pipe; the main diverter packer is 35.5 in. ID. We are currently trying to

test and confirm the closing times on a 10 in. bore insert packer

installed closing on a 5 in. pipe mandrel.

The manufacturer contends that “nominal bore” as stated in API 16D,

Section 5.5.2, is defined as the main packer of the diverter, even though

the actual bore is reduced to 10 in. due to the insert packer. By this

interpretation, they contend that since the diverter main packer is larger

than 20 in. and the closing time should be 45 seconds.

Question: Since the insert packer is installed and thereby reducing the

bore to 10 in., should the “nominal bore” be considered less than 20 in.

and the closing time be 30 seconds in accordance with Section 5.5.2?

The annular packing element and the insert packer are two

different components used for sealing in a diverter, therefore, if an

insert packer is used for a specific application, the closing time

would still be based on the nominal bore of the annular packing

element (i.e., the I.D. before the insert was installed).

16D 2nd Edition,

July 2004

5.5.2.1 16D-01-08 In Section 5.2.2.1, what constitutes the “entire accumulator system” in

this section for a subsea stack?

All surface and subsea bottles are considered in the “entire

accumulator system”. However, when and where those bottles are

independent and/or assigned to a specific purpose or set of

functions (i.e. acoustic, auto shear or deadman) they are not

included in the entire accumulator system count.

If for some reason they are “shared” they should be counted in

the “entire system count”, but if they are in place and only support

those specific tasks and not normally used in the day to day

operation of the BOPE they are not counted in the “entire

accumulator system” count.

API Spec 16D - Specification for Control Systems for Drilling Well Control Equipment and Control Systems for

Diverter EquipmentLast update: January 23, 2013

Page 1 of 2

Page 2: API Spec 16D - Specification for Control Systems for ...mycommittees.api.org/standards/techinterp/epequip/Shared Document… · Standard Edition Section Inquiry # Question Reply API

Standard Edition Section Inquiry # Question Reply

API Spec 16D - Specification for Control Systems for Drilling Well Control Equipment and Control Systems for

Diverter EquipmentLast update: January 23, 2013

16D 2nd Edition,

July 2004

10.1.2 16D-01-08 Background: Our inquiry is in regards to flame retardant flexible piping

outside of the API 500, Div. 1, area relative to the wellhead.

Section 4.3.4.2, Piping Systems, reads: “All rigid or flexible lines

between the control system and BOP stack shall be flame retardant,

including end connections, and shall have a rated working pressure at

least equal to the rated working pressure of the system or subsystem in

which the piping is installed.”

The second reference is Section 10.1.2, Fire Tests, which reads: “The

control lines, and any component of the control lines to a surface-

mounted BOP stack or diverter, located in a Division 1 area, as defined

by API 500 (area classification), shall be capable of containing the hose

rated working pressure in a flame temperature of 1300°F (700°C) for a 5-

minute period.”

Question: Is it required that flame retardant flexible piping outside an

API 500, Division 1 classified area comply with the API 16D, Section

10.1.2 fire testing requirements?

No, however system operators should keep in mind that

personnel will require time to evacuate to a safe location knowing

they retained control over the hydraulics to the subsea and

surface equipment during a fire. It is the responsibility of the

operator to ensure the safe evacuation of the personnel during

such an event.

16D 2nd Edition,

July 2004

Annex D 16D-01-09 Background: We have a request for quote from a customer that wants

us to supply a BOP control system with wireless remote interfaces built

and monogrammed to API 16D. I know that wireless interfaces are not

addressed in second edition of API 16D and have great concern with

trying to monogram a system with a wireless interface.

Question: Is it permissible for API 16D Monogram licensees to apply

the API monogram to BOP control systems with wireless interfaces?

Reply: No. The API Monogram license agreement states:

"Licensee agrees that use of the API Monogram on the products

shall constitute a representation and warranty by Licensee to API

and to the purchasers of the Licensee’s products that the

products conform to the applicable standards, specifications, and

requirements of API.”

Since API 16D does not contain requirements for wireless BOP

control systems, it is not possible for the licensee to warrant that

such systems comply with the standard.

Page 2 of 2