Instrumentation Inspection and Quality Control CBT 2021 Questioner – Part-03

Instrumentation Inspection and Quality Control CBT 2021 Questioner – Part-03

فحص الأجهزة ومراقبة الجودة CBT 2021 السائل – الجزء -03

Q. What is Foundation Field bus system?

A fully digital control system is called Foundation Field bus system.

Q. What are meant FAT, SAT, RAT?

FAT : Factory Acceptance Test

SAT : Site Acceptance Test

RAT : Run Acceptance Test

Q. What is Microprocessor Control System? Give a brief of PLC, DCS and SCADA?

Computer based control system is called Microprocessor control system.

The brief of PLC, DCS and SCADA are as following:

PLC : Program Logic Control system

PLC’s are used in practice with the aim of achieving higher degree of availability

or fault tolerance. The types are as follow:

Fault Tolerant: 1 out of 2 objective systems objective: Reduce the probability of

losses of production by switching to a standby system.

Fail Safe: 2 out of 2 system objective: Protect life, the environment and

investment by safely disconnecting to a secure “off” position.

DCS : Distributed Control System.

SCADA : Supervisory Control And Data Acquisition.

Q. What are inspection points for a cable tray installation?

Material check as per approved spec, size and type, trays hook‐up, proper distance structure,

tray to tray i.e. power/control/signal/low voltage and high voltage, support and fixed strong not

shaking.

Q. What are inspection points for field instruments with impulse tubing?

Material inspection as per approved spec material, type and size, installation as per Hook‐up,

check line route to avoid any obstruction, check tube bending and check tube support,

compression fitting of ferrules and then test (Hydro‐static test) shall be done.

Q. What are inspection points for cable laying?

Material inspection as per approved materials, type and size, meggering, cable routing drawing,

completion of cable route (tray, conduit or trench etc) and cable numbering (tags), cable

bending, use of proper tools and equipment for cable pulling.

Q. What are inspection points for Junction Box and Marshalling Cabinets?

Material inspection, type size as per approved specification, installation hook‐up for frame,

bracket or stands, fixed properly means shaking free, Name Plate and Tag No.

Q. What are standard methods of Ferrules addressing to and from a Junction Box?

For to side only Terminal’s Address required which shall be close to terminal either side and

complete information shall be off from side after or before as per left and right side.

Q. What are standards of installing a DP Transmitter in gas service and why?

Inst. (DP Transmitter) in gas service shall be above the process to avoid the malfunctioning and

drain the liquid (condensate) into the process line easily.

Q. What is RFI? When and RFI will be raised?

Request for Inspection (RFI), RFI shall be raised only when the status of the preliminary

inspection satisfactory, and the works (items) or Hold or Witness Points.

Q. What is final RFI? When it shall be raised up?

When the QA/QC department of contractor is satisfied that the work detailed in the

construction RFI is completed then request submitted for inspection to the client QA/QC

department.

Q. What are the required documents for an inspection?

Following are the required documents for an inspection:

: RFI (Request for Inspection)

: P&ID for line inspection

: PP for location

: Wiring diagram for wiring details.

: Data Sheet for calibration and pressure test.

: Hook‐up etc. for remote tubing/air line

: QR for maintaining record.

: WP (Work Procedure) to check each and every step as per spec.

: QCO for issuing in case of little violation.

: NCR (Non Compliance Report) for issuing in case of major violation etc.

Q. What are the required documents for a Remote Loop folder?

Following are the required documents for a Remote Loop folder:

: Loop package Check list

: ILD (Instrument Loop Diagrams)

: Instrument Loop Acceptance record (TR/Test Record)

: P&ID (Piping & Instrumentations Diagram)

: ISS/IDS (Inst. Spec Sheet/Inst. Data Sheet)

: Alarm List

: Calibration Record (TR)

: Cable Megger Report (Primary Prior to Pulling)

: Cable Megger Report (Secondary after Pulling)

: Pressure Test Record (TR)

: MC Check Record (Remote Loop) (Green Color)

: MC (Marshalling Cabinet) Punch List

: Loop Check Punch List

Q. Explain why shield of signal cable is not earthed on both sides?

To avoid the current noise (Resonance)

Q. How do you determine the correct installation of flow orifice?

The orifice data tag shall be punched in the upstream of orifice, the data (tag) side shall be in

the upstream of flow direction.

Q. What are the required documents for a Local Loop folder?

Following are the required documents for a Remote Loop folder:

: Loop package check list

: ILD (if not mechanical loop)

: Cable Megger Report (Primary Prior to Pulling) if not mechanical loop.

: Cable Megger Report (Secondary after Pulling) if not mechanical loop.

: Alarm Loop (If not Mechanical Loop)

: P&ID

: ISS/IDS

: Calibration Record (TR)

: Pressure Test Record (TR) if required

: MC Check Record (Local Loop) (Green Color)

: MC Punch List

: Visual Check Punch List/Loop Check Punch List.

Q. What are the previous levels of inspection? Explain

They are as following:

Level of Inspection for Material

a) Level 0 : Documents requirements only, no Inspection

b) Level 1 : Inspection prior to shipping

c) Level 2 : Minimum requirements, pre‐inspection meetings, one or more

unspecified “in progress” surveillance visits.

d) Level 3 : Same as level 2, except that “in progress” surveillance inspection shall

be in regular basis.

e) Level 4 : Resident Inspector continuously monitors the works.

Level of Inspection for construction phase:

a) Hold Points (H) : The inspection activity will not proceed without the presence of

Inspector.

b) Witness Points (W) : Inspection activities can be proceeding after issuing RFI.

c) Review (R) : Verification of documentation (NMR) on its correctness as per

spec and approved drawings.

d) Surveillance (S) : Inspector has right to conduct random inspection of works.

e) Inspect (I)/

Perform (P)/ : Construction can be proceeding to next phase without client

Test (T) inspection.

Q. What is ITP’s? What are hold and witness Points?

ITP means “Inspection and Test Plan” details of work scope and required types of Inspections.

Hold Point (H) is the level of inspection that client inspection must required through RFI

and cannot be proceed until inspection is done by client.

Witness Point (W) is the level of inspection that inspection activity can be preceded

without client inspection or client is not available as per RFI timing.

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