Sahawatthanakit (1988) Co., Ltd.
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Articles, news, and technical insights on construction materials, pallet racking, lubricants, and Thai industrial standards — sourced and cited from trusted references.

Food and cold-storage plant engineer planning refrigeration, hygienic floors, food-grade lubricants, and water/air systems for a food production line

Food & Beverage and Cold-Chain Factory Fit-Out and Maintenance Field Guide — Select Refrigeration/Refrigerants to ASHRAE 15/EN 378/ISO 5149 · Hot-Washdown PU-Cement Floors · NSF H1/ISO 21469 Food-Grade Lubricants · Food/Pharma Corrosion Coatings · Boiler-Cooling-RO Water · ISO 8573 Food-Contact Air · Safe Hot Work + How to Lock In Material Pricing

Field guide for food & beverage and cold-storage plant owners and engineering/maintenance teams: plan the whole factory with food safety governing every choice — select the refrigeration system/refrigerant by temperature band and refrigerant safety per ASHRAE 15/EN 378/ISO 5149, handle ultra-low/freeze-dry and retrofit of legacy R-13B1, lay PU-cement floors that survive hot-water washdown and food acids in wet zones, choose NSF H1/ISO 21469 food-grade lubricants for points above food, coat walls/tanks to food/pharma grade, control process water (boiler/cooling/RO/CIP) and cooling-tower legionella, control food-contact compressed-air quality to ISO 8573, and control hot work during repair/install per NFPA 51B — plus how to standardize materials to lock pricing and delivery for the whole plant.

food factoryfood and beveragecold storage
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HVAC contractor selecting refrigerant cylinders of multiple grades for installation and maintenance work

Pick the Right Refrigerant for the Job — A Contractor's Field Guide: Charge Tables by System (Split / VRF / Chiller / Cold Room / Ice Plant / Auto) + R-22/R-404A Replacements + How to Source Cylinders Fast

Field guide for HVAC/R contractors in Thailand: choose the correct refrigerant by actual system type (residential/commercial Split & VRF, chillers, MT/LT cold rooms, ice plants, automotive, ULT) + R-22/R-404A drop-in & retrofit table + compressor oil you must change with it (MO/POE) + how to source refrigerant fast at contractor/fleet pricing.

RefrigerantHVAC contractorR32
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Industrial counterflow induced-draft cooling tower with water treatment system for factories in Thailand

Industrial Cooling Tower Selection + Water Treatment: Types, Range/Approach, and Scaling/Corrosion/Legionella Control per CTI/ASHRAE 188 for Thai Plants

Buyer's guide to industrial cooling towers: compare open-circuit vs closed-circuit, counterflow vs crossflow, induced-draft vs forced-draft → calculate Range/Approach → water treatment for Scaling/LSI, Corrosion, Biofouling, and Legionella per CTI ATC-105 and ASHRAE Standard 188 for plants in Thailand.

Cooling TowerWater TreatmentLegionella
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Industrial cold storage room with evaporator and PIR sandwich panel for food and pharma plants in Thailand

Industrial Cold Room / Cold Storage: Chiller vs Freezer vs Blast Freezer + Refrigerant Selection + Cooling Load Calculation + EN 378/GDP Standards for Thai Food, Pharma & Logistics Plants

Buyer's guide to industrial cold storage: separate chiller (+2 to +8°C) / freezer (−18 to −25°C) / blast freezer → calculate real cooling load before sizing → compare refrigerants R-449A/R-448A/R-290/R-744/NH3 → choose PIR panel thickness → contractor checklist + EN 378/ISO 5149/GDP/HACCP standards for plants in Thailand.

Cold RoomCold StorageChiller Room
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Cascade refrigeration system of a freeze dryer with ultra-low-temperature gauges and an R-508B refrigerant cylinder

Very-Low / Ultra-Low Temperature Refrigerant Retrofit — Replacing R-13B1 / R-503 / R-13 in Freeze Dryers & Cascade Systems with R-508B, Done Right

A guide to very-low / ultra-low temperature (VLT/ULT) refrigerant retrofits for freeze dryers (lyophilizers), environmental chambers, blast freezers and cascade systems in Thailand: why R-13B1 (halon), R-503 and R-13 (CFC) are obsolete/unobtainable, the modern replacement R-508B across −40 to −80°C, the most-missed core of the job — changing compressor oil (mineral/AB → POE) and low-temperature oil return, how glide/azeotrope affects charging and the TXV, retrofitting both stages of a cascade, the correct procedure (recover → flush → change drier/seals → deep vacuum < 500 micron → charge by weight → pulldown), and why moisture is the deadly enemy at ULT — plus the high GWP of R-508B/R-23, lower-GWP options, and refrigerant import licensing via Thailand's DIW under Montreal/Kigali obligations.

refrigerantultvlt
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Cascade refrigeration system for a freeze dryer ice condenser in pharmaceutical and food lyophilization

Refrigeration System & Refrigerant Selection for Freeze Dryers / Lyophilizers — Buyer's Guide for Pharma, Food & Biotech in Thailand

How to select the right refrigeration system (single-stage, cascade, hybrid) and refrigerant for a freeze dryer ice condenser: calculate sublimation load → set cold trap temperature → compare R-23/R-508B/R-449A → supplier checklist. For pharmaceutical lyophilizers, food freeze-drying, and biotech operations in Thailand.

Freeze DryerLyophilizerRefrigerant
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Oil-free magnetic bearing centrifugal compressor compared with a screw compressor in a chiller plant room

Magnetic Bearing Compressor (Turbocor) vs Screw Compressor — 15-Year TCO for Thai Chillers

Comparing two chiller compressor types: oil-free magnetic bearing centrifugal (Danfoss Turbocor) versus positive-displacement screw — covering part-load IPLV efficiency, first cost, maintenance, oil-free vs oil-flooded, surge limits, and a 15-year TCO model at Thai electricity ~THB 4.5/kWh, with guidance for data centers, hospitals, malls and factories.

refrigerantturbocormagnetic-bearing
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R-134a refrigerant cylinders and a replacement transition plan for cooling systems

When Is R-134a Phased Out? The Kigali Amendment Timeline and Replacement Plan for Thailand

A guide to the R-134a phase-down timeline: why R-134a wasn't banned under the original Montreal Protocol but falls under the Kigali Amendment (HFC phase-down), Thailand's HFC quota reduction schedule (DIW), EU F-Gas + MAC Directive, replacements R-1234yf (automotive) and R-513A/R-1234ze (chillers), plus a transition plan for factories and vehicles in Thailand.

refrigerantr134akigali-amendment
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Glycol chiller secondary loop for a food processing plant with DX evaporator coil

Glycol Chiller vs DX Cooling for Food Plants — Choosing by ASHRAE 90.1 / Thailand BEC

Comparing two cooling architectures for food processing: DX (Direct Expansion) where refrigerant evaporates directly in the coil, versus a Glycol Chiller secondary loop using propylene glycol — covering refrigerant charge limits per ASHRAE 15 / EN 378, food-safety PG vs EG, energy performance per ASHRAE 90.1 / BEC, glycol concentration selection, and how to match the system to Thai food plant requirements.

refrigerantglycol-chillerdx-cooling
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