Fleet: one shared hydraulic and air supply; room for ten more Classics

User, October 2026: the presses run from one shared hydraulic supply
and one compressed-air supply, and the plant may add up to ten more
Newbilt Classics at some point.

- pressing-line: fleet table and intro (shared central supply), new
  bullets on the shared supply and the expansion option, re-quote point
  (central supply for the whole fleet, extendable, can the Classic run
  from it), Hydraulics bullet now the plan.
- scale: "Expansion (option)" capacity row, ~4.7 to 5.8M records/yr on
  the same basis, explicitly outside revenue model and investment;
  utilities note: fifteen presses would need ~2.3 to 2.7 t/h steam and
  up to ~1.9 MW cooling, a utility phase of its own.

docs/equipment/pressing-line.md

@@ -2,17 +2,18 @@
 
 ## Current plan: an all-Newbilt fleet of five presses (October 2026)
 
-Two **Newbilt Duplex** systems, each with two HRP 12 presses on one
-hydraulic unit, fed by an **EX 50** main extruder with an **EX 35**
-auxiliary extruder beside it for a second colour, plus one **Newbilt
-Classic** fully automatic press:
+Two **Newbilt Duplex** systems, each with two HRP 12 presses fed by an
+**EX 50** main extruder with an **EX 35** auxiliary extruder beside it for
+a second colour, plus one **Newbilt Classic** fully automatic press. The
+whole fleet runs from **one shared hydraulic supply and one shared
+compressed-air supply** (October 2026):
 
-| | Presses | Extruders | Hydraulics |
+| | Presses | Extruders | Hydraulics and air |
 |---|---|---|---|
-| Duplex system 1 | 2 semi-automatic | EX 50 main + EX 35 colour | one unit for the system |
-| Duplex system 2 | 2 semi-automatic | EX 50 main + EX 35 colour | one unit for the system |
-| Classic | 1 fully automatic | built in | its own |
-| **Fleet** | **5: 4 semi-automatic, 1 automatic** | **2 EX 50, 2 EX 35, 1 built in** | |
+| Duplex system 1 | 2 semi-automatic | EX 50 main + EX 35 colour | shared central supply |
+| Duplex system 2 | 2 semi-automatic | EX 50 main + EX 35 colour | shared central supply |
+| Classic | 1 fully automatic | built in | shared central supply (to confirm with Newbilt) |
+| **Fleet** | **5: 4 semi-automatic, 1 automatic** | **2 EX 50, 2 EX 35, 1 built in** | **one hydraulic plant, one air plant** |
 
 This replaces the earlier target of a 50/50 split between automated and
 semi-automatic presses (two of each, with the Pheenix AD12 as the
@@ -35,6 +36,24 @@ automated candidate). What it means:
   The second press and the EX 35 complete system 1; system 2 and the
   Classic complete the fleet ([scale](../scale.md) capacity table,
   [roadmap](../roadmap.md) item 24).
+- **One shared hydraulic and air supply.** A central hydraulic plant
+  (pumps, tank, accumulators) and one compressed-air plant feed every
+  press through ring mains, instead of a hydraulic unit per system. It
+  means one plant room to maintain and one place for noise and heat, and
+  it makes adding presses a matter of tapping the ring main. In the
+  [Payap scenario model](../site-candidates.md#payap-scenario-model-october-2026)
+  it is a plant room at the west end of the press hall, with a service
+  trench along the press rows. Open for the re-quote (below): whether the
+  Single 2.1's own aggregate becomes part of the central plant or a
+  standby, and whether the Classic can run from it.
+- **Room to grow: possibly ten more Classics.** The plant may add up to
+  ten more Newbilt Classics at some point. This is an option, not part of
+  the plan or the investment: the layout keeps floor for it (ten Classic
+  positions in the Payap scenario model), and the central hydraulic and
+  air plant should be sized or extendable for it. At Newbilt's per-press
+  figures, fifteen presses would draw ~2.3 to 2.7 t/h of steam and up to
+  ~1.9 MW of cooling, so boiler, chiller and grid connection would be a
+  phase of their own ([scale](../scale.md)).
 - **Capacity** at maturity stays at ~1.0 to 1.5 million records a year on
   two shifts, the range the [revenue model](../finance/revenue-model.md)
   uses: four semi-automatic presses at 60 to 80 records an hour (estimate)
@@ -55,9 +74,10 @@ automated candidate). What it means:
   complete system, and whether the EX 50 is the VEX 50 of the 2024 quote;
   whether one EX 50 keeps both presses of a system at full rate (the
   flyer's Duplex main configuration runs two presses on one extruder); the
-  Classic's price, weight, power, steam and cooling figures; and a
-  central hydraulic supply shared by both Duplex systems (an option the
-  flyer offers).
+  Classic's price, weight, power, steam and cooling figures; and the
+  central hydraulic supply (an option the flyer offers) for the whole
+  fleet, extendable to ten more Classics, including whether the Classic
+  can run from it.
 
 The Pheenix AD12 leaves the plan; it stays in the
 [vendor landscape](../suppliers/vendor-landscape.md) as the comparison if
@@ -119,8 +139,9 @@ What this changes in the plan:
   trim per press (estimate): one Granulator 400 at 200 to 250 kg/h runs in
   short batches, not continuously.
 - **Hydraulics.** One central hydraulic supply for several systems is an
-  option; it changes the machine-floor layout and the utility list in
-  [scale.md](../scale.md).
+  option on the flyer and is now the plan, together with one shared
+  compressed-air supply (see "Current plan" above); it changes the
+  machine-floor layout and the utility list in [scale.md](../scale.md).
 - **Colour effects.** The EX 35 is the add-on for multi-colour work on the
   semi-automatic side. It is not in the 2024 quote; the current plan has
   one per Duplex system.

docs/scale.md

@@ -12,6 +12,7 @@ page as real quotes and the site decision land.
 | Launch | 1 semi-auto press (Newbilt Single, the first half of Duplex system 1), 1 shift | ~90,000 to 135,000 records/yr |
 | Duplex | 2 semi-auto presses (Duplex system 1: EX 50 main and EX 35 colour extruder), 1 to 2 shifts | ~175,000 to 540,000 records/yr |
 | Mature | 4 semi-auto (two Duplex systems, each EX 50 + EX 35) + 1 automated (Newbilt Classic), 2 shifts | ~1.0 to 1.5 million records/yr |
+| Expansion (option) | the mature fleet + up to 10 more Newbilt Classics, 2 shifts | ~4.7 to 5.8 million records/yr (estimate) |
 
 Basis: the current fleet plan of October 2026
 ([pressing line](equipment/pressing-line.md)). The automated Classic
@@ -22,7 +23,10 @@ effectiveness of 60 to 70% applied: 368 to 448 records/hour, ~1.06 to 1.5
 million a year. The theoretical ceiling of the mature fleet at 100% uptime
 is roughly 1.8 to 2.2 million records per year. (The earlier 50/50 fleet,
 two semi-automatic presses and two Pheenix AD12s, landed in the same
-range.)
+range.) The expansion row is an option the plant keeps room for, not a
+plan: ten more Classics add ~1,280 records/hour on the same basis, and
+neither the [revenue model](finance/revenue-model.md) nor the investment
+includes them.
 
 **The 60–70% effectiveness assumption is worth challenging, but not yet
 changing.** Newbilt publishes ≥95% yield and ≥95% uptime for the Classic
@@ -178,7 +182,11 @@ and peak rows above are sized for one Duplex's ~250 kW of cooling; at
 Newbilt's up to 125 kW of cooling per press, five presses need up to ~625
 kW, so the chiller's electrical draw and the plant peak rise accordingly.
 Re-size with the Newbilt re-quote figures, together with the steam below
-([pressing line](equipment/pressing-line.md)).
+([pressing line](equipment/pressing-line.md)). The presses share one
+central hydraulic plant and one compressed-air plant; their draw replaces
+the per-system hydraulic units in the pressing row above. The optional
+ten more Classics would need up to ~1.9 MW of cooling and ~2.3 to 2.7 t/h
+of steam: a utility phase of its own.
 
 Tariff: PEA Schedule 3.2.2, Medium General Service on time of use at
 22 kV (the flat rate is closed to new customers): 132.93 THB/kW demand