HAZOP_GUIDE_BRITISH_STANDARD_IEC_61882_2001

Norhayati petroliam nasional berhad 4397000 01

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Unformatted text preview: ips pump B JK 3 MORE Material A More material A: supply tank over full Filling of tank from tanker when insufficient capacity exists Tank will overflow into bounded area None shown Remark: This would have been identified during examination of the tank Consider high-level alarm if not previously identified EK 95 – 2 © BSI 28 August 2001 1002−80 ISB © Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad 4397000, 01 October 2003, Uncontrolled Copy, (c) BSI STUDY TITLE: P ROCESS EXAMPLE SHEET: 2 of 4 Drawing No.: REV. No.: DATE: D ecember 17, 1998 TEAM COMPOSITION: LB, DH, EK, NE, MG, JK MEETING DATE: D ecember 15, 1998 PART CONSIDERED: Transfer line from supply tank A to reactor DESIGN INTENT: Material: A Source: Tank for A No. 4 Guide word Destination: Reactor Possible causes Consequences Material A More transfer Wrong size impeller Possible reduction in yield Wrong pump fitted Low level in tank Comments Product will contain large excess A Less A Safeguards Inadequate net positive suction head None Actions required Check pump flows and characteristics during commissioning Action allocated to JK Revise the commissioning procedure None Unacceptable Same as 1 Low-level alarm in tank Same as 1 MG None shown Not acceptable Same as 2 – 16 – LESS Transfer A Deviation T ransfer continuously at a rate greater than B Increased flow rate of A 5 MORE Element Activity: 6 8812 E I2:C100 © BSI 28 August 1002−80 ISB © 2001 Table B.1 ( continued) JK Possible vortexing and leading to an explosion Inadequate flow 6 LESS Transfer A. (at rate >B) Reduced flow rate of A Explosion 31 13 BS IEC 61882:2001 Line partially blocked, leakage, pump underperforming, etc. Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad 4397000, 01 October 2003, Uncontrolled Copy, (c) BSI STUDY TITLE: P ROCESS EXAMPLE SHEET: 3 of 4 Drawing No.: REV. No.: DATE: D ecember 17, 1998 TEAM COMPOSITION: LB, DH, EK, NE, MG, JK MEETING DATE: D ecember 15, 1998 PART CONSIDERED: Transfer line from supply tank A to reactor DESIGN INTENT: Material: A Source: Tank for A Deviation Activity: T ransfer continuously at a rate greater than B Destination: Reactor No. Guide word Element 7 AS WELL AS Material A As well as A there is other fluid material also present in the supply tank Contaminated supply to tank 8 AS WELL AS Transfer A As well as transferring A, something else happens such as corrosion, erosion, crystallization or decomposition The potential for each would need to be considered in the light of more specific details 9 AS WELL AS Destination reactor As well as to reactor Line, valve or gland leaks Possible causes Consequences Not known Safeguards Contents of all tankers checked and analysed prior to discharge into tank Comments Considered acceptable Actions required Check operating procedure Action allocated to LB NE – 36 – External leaks 6 8812 E BS IEC 61882:2001 I2:C100 32 23 Table B.1 ( continued) Environmental contamination Possible explosion Use of accepted piping code/ standard Qualified acceptance Locate flow sensor for trip as close as possible to the reactor DH © BSI 28 August 2001 1002−80 ISB © Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad 4397000, 01 October 2003, Uncontrolled Copy, (c) BSI STUDY TITLE: P ROCESS EXAMPLE SHEET: 4 of 4 Drawing No.: REV. No.: DATE: D ecember 17, 1998 TEAM COMPOSITION: LB, DH, EK, NE, MG, JK MEETING DATE: D ecember 15, 1998 PART CONSIDERED: Transfer line from supply tank A to reactor DESIGN INTENT: Material: A Source: Tank for A No. 10 Guide word REVERSE Element Transfer A Material A OTHER THAN Destination reactor Destination: Reactor Possible causes Reverse direction of flow Pressure in reactor higher than pump discharge pressure Back contamination of supply tank with reaction material None shown Position not satisfactory Wrong material in supply tank Unknown Would depend on material Tanker contents identity checked and analysed prior to discharge Position acceptable Line fracture Environmental contamination and possible explosion Integrity of piping Check piping design Other than A Material other than A in supply tank External leak Nothing reaches reactor Consequences Safeguards Comments Actions required Action allocated to Consider installing a nonreturn valve in the line MG Specify that proposed flow trip should have a sufficiently rapid response to prevent an explosion MG – 56 – 12 OTHER THAN T ransfer continuously at a rate greater than B Deviation Material flows from reactor to supply tank 11 Activity: 6 8812 E I2:C100 © BSI 28 August 1002−80 ISB © 2001 Table B.1 ( continued) BS IEC 61882:2001 33 33 BS IEC 61882:2001 6 1882 Ó I EC:2001 B.2 – 35 – Procedures Consider a small batch process for the manufacture of a safety critical plastic component. The component has to meet a tight specification in terms both of its material properties and its colour. The processing sequence is as follows: Licensed Copy: Puan Ms. Norhayati, Petroliam Nasional Berhad 4397000, 01 October 2003, Uncontrolled Copy, (c) BSI a) take 12 kg of powder “A”; b) place in blender; c) take 3 kg of colorant powder “B”; d) place in blender; e) start blender; f) mix for 15 min; stop blender...
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This note was uploaded on 09/15/2011 for the course ECON 102 taught by Professor Calvin during the Winter '11 term at Oxford Brookes.

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