Chinese suppliers for boilers, compressed air and hydraulics

Checked October 2026 on the investor's budget question. New
docs/suppliers/china-utilities.md: boiler makers (ZOZEN, Sitong,
Fangkuai, Taiguo, Yuanda, Yongxing, Taishan, Nobeth) with fit for 500
kg/h at 1.25 MPa, claimed certificates, Thai references and listing
prices; the Thai rules for an imported boiler (MR and MOI notification
B.E. 2549: ASME/JIS/EN or equivalent, certification-body verification,
once-through relief does not reach 10.5 bar, licensed controller, annual
inspection); compressor makers with Thai offices (Kaishan, Denair) and
sizing; hydraulic pump sets and accumulators (Huade, Yuci, Hengli, WMD,
Renowell, Inovance, NXQ makers), the shared-ring-main risks and Thai HPU
builders; duty and freight; open RFQs.

Result: about 2M THB at the midpoint (~2.5M with contingency), ~1 % of
the 216M target, mostly the boilers; Newbilt aggregates stay Newbilt's.
total-investment notes it and lists the uncosted central hydraulic
plant; utilities CSV gets the Chinese candidates and route estimates;
backlinks from equipment-suppliers, pressing-line, README.

docs/equipment/pressing-line.md

@@ -62,8 +62,11 @@ automated candidate). What it means:
   Classic add pump sets in parallel on one manifold with the accumulators,
   and a standby set follows. Each branch gets its own isolation valves and
   filter: with one shared oil system, a contamination event otherwise
-  reaches every press. Steam and cooling follow the same pattern; the
-  phased list for all three is in
+  reaches every press. Chinese pump sets and accumulators for the
+  standby set were checked in October 2026; the press aggregates stay
+  Newbilt's ([Chinese suppliers](../suppliers/china-utilities.md#hydraulics)).
+  Steam and cooling follow the same pattern; the phased list for all
+  three is in
   [scale](../scale.md#utility-phasing-backbone-once-modules-with-the-presses).
 - **Cell layout (October 2026).** Each Duplex system is one operator's
   cell, as sketched in [duplex-cell-layout-sketch.png](duplex-cell-layout-sketch.png)