PIPING PROGRESS MONITORING THROUGH INSPECTION DOCUMENTATION ( Line history sheet entry (LHS entry / Pipe Book entry)

PIPING PROGRESS TRACKING 

WITH 

LINE HISTORY SHEET

Monitoring piping weld joint progress is one of the tedious and most important job in a piping project. There are many ways a piping weld joint progress can be tracked. Here we are discussing about monitoring the progress with the help of Line History Sheet (LHS), where the actual weld joint progress is recorded.

How weld joint progress can be monitored through QC activities and LHS?

1. Monitor the Fitup report entry against WeldVisual report entry and vice versa.

Controlling Parameter: Should be always in the range of 500nos of joints. (This number can differ depends on site condition. This is a good figure if you are engaging approximate 30 welders and your daily weld joint progress is 1000"Dia.)

Points to Check and control if gone outside the limit

a) Check whether your area engineer is making the reports - daily wise (Create an excel sheet to monitor how many reports are submitted by each area engineer for daily entry (for fitup and weld visual)

b) Whether your client in that area is inspecting the joints offered by your engineer on a daily basis?

c) Whether your subcontractor(if so) is offering joints to your engineer?

d) Is your subcontractor doing the rectifications as instructed by your area engineer?

e) Check with which welder you find more time in dressing the joints for weld visual.


2)  The Backlog of Radiography Testing against Weld Visual report entry and/or PWHT report entry.

Controlling Parameter: It should not be greater than the average of radiography ( in number of joints) that can be taken in two days time by your NDT agency.

Points to Check and control if gone outside the limit
a) Check whether proper offering (in nos of joints) is getting to your NDT agency from your area engineers.

b) Check your NDT agency is taking joints which are being offerred.

c) Check whether your NDT agency is having experienced technicians (experienced technicians will take more joints - speed will be more) .

d) Check whether you are providing proper number of riggers and scaffolding for your NDT agency (Speak with your night NDT technicians.)

e) Check whether proper lighting is available night near each and every joint that you are offering.

3)  Backlog of PWHT report entry against Weld Visual report entry.


Controlling Parameter: It should not be greater than the average of PWHT (in number of joints) that can be done in two days time by your PWHT agency.

Points to Check and control if gone outside the limit
a) Check whether proper offering (in nos of joints) is getting to your PWHT agency from your area engineers.

b) Check your PWHT agency is doing joints which are being offerred.

c) Check whether your PWHT agency is having experienced technicians (experienced technicians will do more joints - speed will be more) .

d) Check whether you are providing proper number of riggers and scaffolding for your pwht agency in time (Speak with your PWHT technicians.)

e) Check whether proper number of coils (in gauge, numbers), cables (compensating and power cable in sufficient lengh and qty), ceramic wool (the inventry of wool should be monitored regularly), binding wire etc are available with your PWHT agency.

f) Check whether shift of works are properly overlapped - of your PWHT agency. When a shift starts, the shift technicians along with helpers should execute the PWHT of the joints- made ready in previous shift- as well as prepare the joints (coil wrapping, wool wrapping, connection etc.) for next shift.

g) Under stand the thump rule (a general rule based on the commonly available machines) is , to one PID, 3 numbers of coils can be connected and these three coils can be monitored using three recorders. So it should be ensured that with each PID machine 3 recorders should be available. With each recorder 6 numbers(there are mcahines with 12 thermocouple also) of thermocouples can be connected. So as per the number of thermocouples for each joint, the number of joints that can be done (PWHT) can be calculated. When calculating keep in mind that 6 themocouple in one recorder but one recorder to one coil only. that is if size is big for example 30" joint (3 themocouples) and one coil is used to wrap it, then one coil - one recorder but to this recorder only 3 termocouples will be connected (balance 3 thermocouple points in this recorder will be free - not connected)

4)  Backlog of DPT report entry against Weld Visual report entry and/or PWHT/RT entry.


Controlling Parameter: It should not be greater than the average of DPT (in number of joints) that can be done in two days time by your NDTagency/In house level-1 technicians.

Points to Check and control if gone outside the limit
a) Check whether proper offering (in nos of joints) is getting to your ND agency from your area engineers.

b) Check your NDT agency is doing joints which are being offerred.

c) Check whether your NDT agency is having experienced technicians (experienced technicians will do more joints - speed will be more) .

d) Check whether you are providing proper number of riggers and scaffolding for your NDT agency in time (Speak with your NDT technicians.)

d) Check whether your mechnical sub contractor is attending repairs as instructed by your area engineer.

5)  Repair status

a) Make a rule that, if a joint is found of having defects, that welder (who welded the defective joint) should not weld further before attending the repairs.

6) PMI status


a) Check PMI report progress against total scope

b) Check the time period over which you have to do the job and plan for PMI machine and operator. One day of 8hrs duty time, one operator- one PMI machine can check a maximum of 250Spots on an average.


7) Ferrite/Hardness checking status

a) Check Ferrite report progress against total scope



b) Check the time period over which you have to do the job and plan for Ferrite/Hardness checking machine and operator. One day of 8hrs duty time, one operator- one machine can check a maximum of 300 Spots on an average.