Labour and Staffing for a Block Factory in Iraq: Shift Coverage, Not Headcount

Labour and staffing for a block factory in Iraq is a shift coverage problem before it is a payroll problem. The number that decides output is not how many names sit on the roster but whether every post on the line is filled during every hour the plant runs. A complete automatic line of the QSGW type needs 3 to 6 people per shift depending on how batching, palletising and packing are configured, and a curing and palletising line of the QSRGY type finishes its entire task list with 3 to 4. Six names on a day shift produce less than four people who can also cover the night.

Which posts does a block plant have to cover?

The post list is short and does not change with machine size. Batching and the cement silo, the main machine operator, the pallet and curing line, finished block packing and loading, and the maintenance electrician. A line rated 90,000 standard bricks in a shift and one rated 220,000 carry the same five posts. What changes is how many bodies each post needs, and whether one trained person can hold two posts while the line is idle.

• Batching and cement silo: aggregate and cement feed, mix ratio, moisture, and the first place a blockage starts.
• Main machine operator: cycle rhythm, block height, vibration sound, mould condition, start and stop.
• Pallet and curing line: pallet magazine level, stacker, transfer, and green block that must not be touched early.
• Packing and loading: block count per bundle, strap and edge protection, forklift movement in the yard.
• Maintenance electrician: hydraulic pressure, electrical alarms, sensor faults, and the decision to stop the line.

How many people does one shift need?

The working figure for a complete automatic line is 3 to 6 people per shift, and configuration decides where in that band you land. Three holds up when the batching machine meters aggregate against a set mix, the silo is fed by conveyor, and the stacker discharges to a fixed lane. Six holds up when packing is manual, when blocks leave the yard on forklifts loaded by hand, and when batching, pressing and curing each need their own set of eyes.

A curing and palletising line is a different animal. It completes the whole production task with 3 to 4 people, because pallet handling, stacking and discharge are machine driven and the crew supervises rather than lifts. Staffing then becomes a layout decision: every transfer you automate removes a post, and every manual transfer adds one.

Count posts, not headcount. A post that stands empty for part of a shift is a stopped line for that part of the shift, and two people who each hold half a post hold no post at all.

What has to be settled at a two shift handover?

The handover is where a two shift plan fails quietly. The outgoing operator knows which mould is in the machine, which pallet stack is below the minimum, whether the mixer is running wet, and which alarm was cleared twice in the shift. None of that reaches the production board.

Keep the handover sheet to five lines: mould in the machine, pallet count at the stacker, batch ratio in use, alarms cleared during the shift, and what the next crew must not touch. A quarter of an hour of talk at the change point is cheaper than an hour of a night crew guessing at a mix.

The second decision is night minimum manning. Someone on the night shift has to clear a blocked hopper or a jam under the mould, and someone has to hold the authority to stop the machine and keep it stopped. If that person leaves with the day shift, the night shift runs on hope until something breaks.

Why the maintenance role cannot ride on the main operator

The main operator watches rhythm: cycle time, block height, the sound of the vibration, the way the face closes. That is a full attention load on a 15 to 25 second cycle, with no room left for a pressure gauge. A press rated at 31.5 MPa gives warning through small things, a slower stroke, a softer face, a drift in height, and those signals need a person who is looking for them.

The electrical side is separate again: alarms on the panel, a contactor that chatters, a sensor that drops its signal once an hour, a stacker that stops mid travel. Someone has to read those within 24 hours, because a fault that repeats becomes a failure.

One electrician can cover two shifts on a small plant, and that is workable. What is not workable is writing him into the roster as a second operator. The moment the maintenance post is used as spare labour, the pressure readings stop and the alarm log goes unread, and the first sign of trouble is a broken machine.

How long does a new operator take to become independent?

Three weeks is a working number, and the weeks are not interchangeable. In week one the new operator rides the machine with the person leaving the post: the sequence, the sound of a normal cycle, where the emergency stop sits, what the stacker does at the end of a pallet row.

Week two he runs the machine with the trainer behind him: start-up, shutdown, block height checks, the pallet magazine, and a product change at low speed. He should be making saleable blocks by the end of it.

Week three is mould change and fault clearing: which bolts come out, how the mould seats, what to look at when the block face is soft, and when to stop and call the electrician instead of adjusting. A person is not covered until week three is done, so train the night shift first. A plant that trains only the day shift ends up with one trained shift and one that improvises.

What does one stopped hour remove from a shift?

Take a QST6-15 running a 390 x 190 x 190 mm hollow block at 6 blocks per mould. The listed output is 8,640 to 11,520 hollow blocks in an 8 hour shift, which is 1,080 to 1,440 blocks in one hour. On standard brick at 32 to 36 per mould the same machine is listed at 46,080 to 61,440 bricks in 8 hours, or 5,760 to 7,680 in one hour.

The spread is the cycle itself. A 15 second cycle puts 240 cycles into an hour, a 23 second cycle puts 156, and the difference is not a rounding error, it is a third of the shift. At the top of the range a QST1800 is rated 220,000 standard bricks in 8 hours, which is 27,500 bricks in one hour at nameplate.

Bricks are the visible loss. The hidden loss sits on the pallets: an hour of stopped machine leaves green blocks standing in the curing line, and those blocks hold pallets that the next shift needs. An hour lost at the press is often an hour lost at the stacker as well.

Send the shift pattern you intend to run, the product mix, and the automation level you want at batching, packing and loading. Staffing then becomes a post table with names against it, sized on your configuration rather than on a rule of thumb. A plant laid out for four people and run with three will show it in the pallet count before it shows in the sales report.