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.

README.md

@@ -75,6 +75,8 @@ steps are open planning items.
   ~161M to 292M THB (midpoint ~227M), so 216M is a realistic target with
   four levers and 180M a low-quote case
   ([total investment](docs/finance/total-investment.md#launch-plant-october-2026)).
+  Chinese boilers, compressor and hydraulics save about 2M THB of that
+  ([Chinese suppliers](docs/suppliers/china-utilities.md)).
   The business plan is being re-based on it.
 
 ## Planning Documents
@@ -108,6 +110,10 @@ The detail lives in dedicated documents:
   (Pheenix Alpha, the comparison for the Classic)
 - [Equipment needs and supplier map](docs/suppliers/equipment-suppliers.md):
   the full needs list per production step with supplier tables and contacts
+- [Chinese suppliers](docs/suppliers/china-utilities.md): boilers,
+  compressed air and hydraulics from China (makers, published prices,
+  Thai offices, Thai boiler rules for imports); saves about 2M THB, ~1 %
+  of the budget
 - [Sustainability](docs/sustainability.md): the solar installation (Deye
   inverters, 271 kWh Gobel Power battery stack), the PEA grid tariff and
   what it decides (biomass steam at a quarter to a tenth of the cost of
@@ -299,7 +305,8 @@ docs/
 │                          construction RFQ, PEA electricity tariff
 │                          schedule (pea/), biomass fuel market
 │                          reports (biomass/)
-├── suppliers/             Supplier contacts, vendor landscape, supplier map
+├── suppliers/             Supplier contacts, vendor landscape, supplier map,
+│                          Chinese utility suppliers (china-utilities.md)
 ├── artist-order.html      Artist ordering and fan-funding demo page
 ├── artist-platform.md     Upload, price calculator, fan-funded pressing
 ├── biomass.md             Biomass fuel strategy and the 60 rai coppice idea