SIGAS PR-Station Medical Dual-Loop Pressure Regulation Station

Overview

The SIGAS PR-Station is a CE-certified, DIN EN ISO 7396-1 compliant medical gas pressure regulation station engineered for continuous, fail-safe operation in hospital central utility systems. Designed specifically for integration into medical air compressor plants, liquid oxygen (LOX) vaporization skids, and zone-specific distribution networks across clinical floors, the PR-Station implements a dual-loop pressure reduction architecture grounded in the principles of redundant pneumatic control and ASME B31.9-compliant gas system integrity. Each loop incorporates a high-stability, stainless-steel diaphragm-type medium-pressure regulator calibrated for long-term drift resistance under variable flow conditions (0–300 Nm³/h typical). The system operates on the principle of parallel-path pressure stabilization—where one circuit remains active while the other remains pressurized but isolated—enabling zero-downtime maintenance without interrupting downstream gas supply to critical care zones, anesthesia workstations, or ICU ventilators.

Key Features

• Dual-circuit architecture with independent isolation ball valves, allowing live-switchover between primary and standby loops under full line pressure—no system depressurization required.
• Oxygen-clean, alcohol-free solvent compatible construction; all internal wetted surfaces fabricated from ASTM B111 C12200 de-greased copper tubing, certified per CGA G-4.1 and ISO 8573-1 Class 1 (oil-free, particle ≤0.1 µm).
• Each circuit equipped with a precision digital pressure transducer (0–1.6 MPa range, ±0.25% FS accuracy) and a tamper-resistant, non-resettable mechanical safety relief valve (optional, set at 1.0 MPa).
• Modular front-access panel design with IP54-rated enclosure; optional ATEX Zone 2 / IECEx certified explosion-proof housing (II 2G Ex d IIB T4 Gb) for installation in plant rooms with potential hydrocarbon vapor exposure.
• Emergency manual override handle integrated into the valve cabinet door, enabling rapid mechanical disengagement during actuator failure or power loss—compliant with NFPA 99 Chapter 5.1.12.3 requirements for manual bypass accessibility.
• Standardized 1/2″–2″ BSP/NPT inlet/outlet ports with configurable orientation (top/bottom/side entry); custom routing supports wall-mount, floor-stand, or skid-integrated deployment.

Sample Compatibility & Compliance

The PR-Station is validated for use with medical air (ISO 8573-1:2010 Class 1,3,2), oxygen (USP , Ph. Eur. 2.2.42), nitrous oxide, and nitrogen (all meeting ISO 7396-1:2016 Annex C purity and pressure stability criteria). All elastomeric seals conform to USP Class VI biocompatibility testing. System documentation includes EU Declaration of Conformity (DoC), Factory Acceptance Test (FAT) report per EN 13567, and traceable calibration certificates for each pressure sensor (NIST-traceable, accredited to ISO/IEC 17025). Installation complies with HTM 02-01 (UK), VDE 0100-710 (Germany), and ASSE 6040 certification pathways for medical gas shutoff and regulation assemblies.

Software & Data Management

While the base PR-Station operates as a fully mechanical-electropneumatic system, the optional SIGAS Remote Telemetry Module (RTM-PR) provides Modbus RTU (RS-485) and BACnet MS/TP outputs for integration into hospital-wide BMS or centralized medical gas monitoring platforms (e.g., MSA, VIGIL, or Siemens Desigo CC). Alarm states—including overpressure, underpressure, valve position fault, and door-open detection—are timestamped with audit-trail logging compliant with FDA 21 CFR Part 11 and EU Annex 11 requirements when paired with validated SCADA infrastructure. Configuration parameters are stored in non-volatile memory with write-protection enabled by default.

Applications

• Primary pressure reduction at hospital central plant outlets feeding branch distribution manifolds.
• Zonal pressure staging for surgical suites requiring stable 0.45 ±0.03 MPa medical air and 0.35 ±0.02 MPa oxygen.
• Backup regulation layer for LOX vaporizers where inlet pressure fluctuates due to ambient temperature cycling.
• Interface point between third-party gas suppliers (e.g., Linde, Air Liquide) and hospital-owned internal piping networks.
• Pressure conditioning for laboratory gas cabinets and cleanroom nitrogen purge systems requiring ISO 8573-1 Class 2 particulate control.

FAQ

Is the PR-Station suitable for oxygen service above 1.0 MPa inlet pressure?
No. Per CGA G-4.1 and ISO 7396-1, maximum allowable inlet pressure is 1.6 MPa—but for oxygen applications, SIGAS recommends limiting inlet to ≤1.0 MPa unless specified otherwise in the FAT protocol.
Can the digital pressure gauges be recalibrated onsite?
Yes—each gauge features a 4–20 mA analog output and HART® communication port; field recalibration is supported using a NIST-traceable deadweight tester and SIGAS Calibration Utility v3.2.
Does the system meet seismic qualification requirements for California hospitals?
When mounted on a qualified seismic bracket (tested per IBC 2021 Appendix Chapter A1, ICC-ES AC156), the PR-Station satisfies OSHPD Category IV structural anchorage requirements for medical gas equipment.
What maintenance intervals are recommended for the regulators?
Annual functional verification per HTM 02-01 Section 5.3.2; diaphragm replacement every 5 years or after 10,000 operating cycles—whichever occurs first—using SIGAS OEM spare kits (P/N REG-PR-DIA-01).