Payap model: Duplex cells at Newbilt sizes; fire water per facility-security

User, October 2026: the Duplex sketch is not to scale, check it against
the documents; the fire water tank is too small.

Model (changed live in the open FreeCAD 26.3 document):
- both Duplex cells rebuilt in the sketched arrangement at the documented
  sizes: presses 0.95 m square (0.9 m2) turned 45 deg, EX 50 0.5 x 1.0 m
  (0.5 m2), EX 35 0.4 x 0.8 m and trimmer 0.6 x 0.6 m (estimates),
  operator position marked; 0.6 to 0.8 m between machines;
- fire water: the ~25 m3 yard tank replaced by the facility-security
  planning tank, 9 m x 4 m (254 m3 gross, ~200 m3 usable), new params
  fw_dia, fw_h, fw_x, fw_y, at the front by the access road, outside the
  production yard, on a ring foundation, with a pump house (duty electric,
  standby diesel, jockey); the yard process water tank is now the 5 x 3 m
  raw water tank of the phase 1 RFQ.

Docs: site-candidates (cell, raw water, fire water bullet),
facility-security (the Payap model draws the tank; 6 m racking and twice
the floor area make ~200 m3 a floor there).

docs/facility-security.md

@@ -136,7 +136,12 @@ sprinkler demand, so the site carries its own reserve and pumps.
 **Warehouse racking height drives the real number.** If finished-goods
 storage goes above roughly 3.7 m, the commodity classification and sprinkler
 design change, and the stored volume grows with them. Fix the racking height
-before the fire design is frozen, not after.
+before the fire design is frozen, not after. The
+[Payap scenario model](site-candidates.md#payap-scenario-model-october-2026)
+draws the 9 m × 4 m tank with its pump house at the front. It also draws
+6 m warehouse racking and about twice the floor area this figure was
+based on, a paper store among it, so treat ~200 m³ as a floor there,
+not as the answer.
 
 The property insurer will drive much of the final specification, so involve
 them before the design is fixed. The archive gas system and the BESS

docs/site-candidates.md

@@ -146,7 +146,10 @@ and every equipment envelope is an estimate.
     ([pressing line](equipment/pressing-line.md)).
   - **Press hall** (~870 m²): two Duplex systems, each two HRP 12 presses
     with an EX 50 and an EX 35, the Classic, and ten more Classic
-    positions in two rows.
+    positions in two rows. Each Duplex is one operator's cell of about
+    5 × 3 m at Newbilt's machine sizes: presses either side turned
+    towards the operator, the extruders behind him, one trimmer in front
+    ([pressing line](equipment/pressing-line.md)).
   - **One shared hydraulic and compressed-air supply**: a central plant
     room (~62 m²) at the west end of the press hall, and a service trench
     along the press rows for the hydraulic ring main, compressed air,
@@ -199,13 +202,20 @@ and every equipment envelope is an estimate.
 - **Utility yard** behind the press hall, across a 6 m lane:
   - boiler house with chimney and a covered fuel store;
   - chiller and cooling tower;
-  - process and fire water tanks;
+  - a raw water tank (5 m × 3 m, as in the phase 1 RFQ);
   - PEA transformer;
   - a pipe bridge that drops into the service trench.
 
   Boiler, chiller and transformer are drawn at the one-Duplex sizes. They
   need re-sizing for five presses, and again if the Classics are added
   ([scale](scale.md)).
+- **Fire water** at the front, reachable from the frontage without
+  entering the production yard
+  ([facility security](facility-security.md#fire-water-supply)): a
+  9 m × 4 m tank (~200 m³ usable, planning figure) on a ring foundation,
+  with a pump house for the duty (electric), standby (diesel) and jockey
+  pumps. The model's 6 m warehouse racking and its larger buildings will
+  raise the volume; the hydraulic design sets it.
 - **Access**:
   - one gate on the south side opens onto a truck apron in front of the
     dock doors;