INSTRUCTIONS FOR THE USE OF CHOKE AND KILL LINES.pdf

ContiTech Rubber Industrial Kft. Hose Technical Department

Doc. No.: TKO AS2

Revision: 8

Page: 1/6 HANDLING

Date: 31.07.2008

Invalidate the document TKO AS2 rev.7

Prepared by: Revised by: Approved by:

Imre Domonkos

József Dávid

Gyula Bétéri

FOR BEST IMAGE QUALITY SUGGESTED TO PRINT IN 600 DPI

INSTRUCTIONS FOR THE USE OF

CHOKE AND KILL LINES

ACC. TO API SPEC. 16C AND

API SPEC. 16C DRAFT 07C

HANDLING

Doc. No.: TKO AS2

Revision: 8 INSTRUCTIONS FOR THE USE OF CHOKE

AND KILL LINES Page: 2/6

1. INTRODUCTION

The function of flexible Choke and Kill lines is defined in API Spec 16C §9.14. as follows: “Choke and Kill lines are an integral part of the surface and subsea blowout prevention equipment required for drilling well control. The kill line provides a means of pumping fluid into the wellbore, when normal circulation trough the drill string cannot be employed. The choke and kill line and manifold provide a means of applying back pressure on the formation while circulation out formation fluid influx into the wellbore following a "kick".” The flexible Choke and Kill (C & K) hoses are designed and produced in general for topside application. For subsea application the user must specify the differential external pressure requirement already at the inquiry and later at the order. These flexible hoses are made with fittings at each end. Note:

- API Spec. 16 C: This is a specification for all of the equipment on a choke and kill system. The API Spec. 16 C has several drafts and a final issue. The API standard indicates that it doesn't inhibit from purchasing products to other specifications. e.g. the authority Det Norske Veritas gives approval only for the hoses, which are produced according to the final API Spec 16C standard. - ContiTech Rubber can produce according to API Spec. 16 C and API Spec. 16 C Draft 07C.

The choices for the suitable standard or the draft standard are the task of user. Before the order is given the user has to study and approve the selected standard. The present instruction could be used for both type of kill and choke hoses. Guidelines for the selection of Choke and Kill lines based on API Spec 16C para. 1.3: "Choke and kill Systems are mobile and are moved to different areas, all service conditions they may be exposed to cannot be defined in this document. However if severe corrosion, abrasion, temperatures or high levels of sour gas are expected, the user and manufacturer shall jointly address the requirements and determine the suitable product for the application." If the user can't define the technical parameters of the unexpected kicks at uninvestigated oilfields, then a decision has to be made for the hoses acc. to API Spec 16C. If the user can define the technical parameters and there is no gas service with rapid decompressions during the lifetime of the hose (except some gas bubbles which run only in seconds through the hoses), then hoses acc. to API Spec. 16C Draft 07/C can be ordered. The purpose of the short instruction is to inform the users about the most important special knowledge for the use of the hoses. A more detailed general publication for the handling, inspection and use -if it is not yet present at the user- can be requested at the following address:

ContiTech Beattie Ltd. Jubilee Industrial Estate Ashington, Northumberland NE63 8UB England Phone: +44 1670 528 700; Fax: +44 1670 520 535 e-mail: [email protected] WEB: www.contitechbeattie.co.uk

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Doc. No.: TKO AS2



Contitech Beattie, Corp. 11535 Brittmoore Park Drive Houston, TX 77041 USA Phone: +1 832 327-0141 Fax: +1 832 327-0148 e-mail: [email protected] WEB: www.contitechbeattie.com ContiTech Rubber Industrial Kft. 6728 Szeged, Budapesti út 10. Hungary Phone: +36 62 566-901; Fax: +36 62 566-999; e-mail: [email protected] WEB: www.contitech-rubber.hu

2. CHECKS PRIOR TO INSTALLATION OF THE HOSES

Before installation the size, pressure range, service requirements, working temperature, bending radius and subsea or topside execution have to be checked whether they are all in accordance with the specification. Cross check to the hose data book and purchase order requirements. Every individual element of the high pressure containment structure is sensitive to overloading. Frequent rapid transients in the operational conditions, including pressure, temperature and mechanical loads should be eliminated as a basis of operational philosophy, or limited as much as possible.

3. SPECIAL CONSIDERATIONS IN USE. (ADDITIONAL PRESCRIPTIONS SEE IN THE GENERAL HANDLING INSTRUCTION!)

3.1. Collapse Resistance Flexible lines subjected to subsea service shall be ordered and designed to with-stand the differential external pressure for the operational depth without deforming to a point where they can no longer function as the design specifies. Collapse resistance requirement specification is the task of the purchaser. If there is no specification in the order, the hoses are not designed for differential external pressure.

3.2. Excessive Axial Load C&K hoses may never be exposed to more axial load as its full fluid filled weight.

3.3. Accidental External Impact Loads These are amongst the most likely to cause permanent damage to the C&K line either by actually crushing the flexible line or damaging the external sheath, therefore must be avoided or if happens the manufacturer should be contacted.

3.4. Rapid decompression Rapid decompression should be avoided, but if it has to be taken into account, the hose has to be ordered according to API Spec. 16 C and then the user should take into account the exposure test according to the API Spec. 16 C § 9.14.12. for what the hose is designed.

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3.5. Fluid properties The flexible line materials are selected with regard to probability of accommodating adverse chemicals (sour conditions). In general C & K lines would be able to accommodate sour conditions only for a limited period of time. Choke and Kill hoses should never be used for well testing and production service. Choke and kill hose can be used in cementing applications, but the cement hose must never be used for choke and kill service. In any event if there is any doubt as to the effect of particular chemicals on the flexible line the manufacturer shall be consulted. Some information is included in the Appendix 1.

3.6. Fluid Velocity Fluid flowing through C & K flexible lines is almost certain to contain solids and the possibility of erosion should be born in mind during operation. To determine the flow velocity in the Choke and Kill line the regulation of API RP 14 E and DNV RP 0501 shall be taken into account.

3.7. Coupling Materials Steel materials to manufacture couplings are usually either forged or rolled steel. Steel structural elements (end-fittings) expected to see H2S service is in compliance with the recognised standards such as NACE MR-0175 / ISO 15156.

3.8. Welding No postwelding is allowed on the couplings

3.9 Temperature The temperature ranges are API Spec. 16C: -20°C ÷ +100°C -18°C ÷ +121°C API Spec. 16C Draft 07/C: -30°C ÷ +121°C The working temperature has to be defined in order.

4. ADDITIONAL REQUIREMENTS (ORDER SPECIFIC!) 4.1. Fire Test (API Spec 16C §10.5.1.) If fire rated C&K hose is required, it has to be able to withstand a 700 °C fire test for 30 minutes duration. The hose may not have visible leakage under normal working pressure as a result of the fire test during the test period, approved by Lloyd’s Register Shipping.

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4.2. High Temperature Exposure Test (API Spec 16C §10.5.2.) This test is intended to determine the maximum temperature that a flexible choke and kill line will withstand for a short duration when exposed to the rated working pressure. This test represents severe survival condition, and this is not used to define the temperature rating of the flexible line. It is imperative that both the line structure and the end terminations be exposed to the temperature excursions during the tests. Upon reaching the rated working pressure and maximum design temperature, the temperature is raised at a rate not to exceed 2.8 °C / hour to 177 ±5.5 °C and held for one hour. At the end of one hour, the temperature is raised at a rate not to exceed 2.8 °C. per hour until failure occurs. Failure is defined, as a fluid leak in the end connection the body of the lines or burst of line. The temperature and total time of exposure to 177 °C and above should be recorded. Acceptance criteria will be sustaining the 177 °C hold period at rated working pressure for one hour with no visible leakage.

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Doc. No.: TKO AS2



APPENDIX 1:

Product compatibility of Therban lined ContiTech Rubber Choke and Kill hoses

(Acc. to API Spec. 16C Draft 07C)

Temperature

0oC 75

oF 150

oF 200

oF 250

oF

Medium

Concentration

-18oCo 24

oC 66

oC 93

oC 121

oC

Hydrochloric acid HCl 15% + + - - -

Hydrofluoric acid HF 0,6% + + - - -

Xylene C6H4 (CH3)2 25% + + + L L

Methanol CH3OH 100% + + L - -

Zinc bromide ZnBr2 Saturated + + L L L

Calcium bromide CaBr2 Saturated + + L L L

Calcium chloride CaCl2 Saturated + + L L L

Sea water + + + - -

Diesel 100% + + + + -

Sodium hydroxide NaOH 50% L L - - -

Hydrogen sulfide H2S 20% for C&K + + + + +

Product compatibility of PA lined choke and kill lines Acc. to API Spec 16C

Temperature Medium Concentration

-18oCo 24

oC 66

oC 100

oC 121

oC

Hydrochloric acid HCl 15% - - - - -

Hydrofluoric acid HF 3% - - - - -

Methanol CH3OH 100% + + - - -

Zinc bromide ZnBr2 Saturated - - - - -

Calcium bromide CaBr2 Saturated L L L L -

Calcium chloride CaCl2 Saturated + + L L -

Methane CH4 100% + + + + +

Diesel 100% + + + + +

Crude oil 100% + + + + +

Hydrogen sulphide H2S <10% + + + + +

Sodium hydroxide NaOH <20% + L - - -

Xylene C6H4 (CH3)2 100% + + + L -

+ OK

- Not suitable

L Limited application

Documents

INSTRUCTIONS FOR THE USE OF CHOKE AND KILL LINES.pdf