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/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