HMS Overview

The SMC Helideck Monitoring System is designed with all the criteria of the current international code requirements for operations in an offshore environment. To ensure complete compliance with different rules and regulations the SMChms provides motion and meteorological information in a clear and comprehensive graphical interface. Together with SMC’s unique modular software solution that provides a flexibility to a vessels array of additional environmental instruments standard and custom displays can be used by different operational teams with one seamless software.

The SMC Helideck Monitoring System meets all current international certification agencies codes from UK CAA & HCA, Norwegian CAA & Brazilian DCP.

The SMChms is a single price solution with no hidden service add-ons. The software cost includes but is not limited to:

  • Access via LAN/WAN as standard along with Multiple external outputs
  • Unlimited User / Technician / Admin licences. Setup and controlled by software owner
  • Safe secure security roles that reduce risk for software modification
  • Unlimited data logging for all instruments with data extraction for investigation and study
  • Pre-flight reports



Day and Night color scheme


Helideck Standards CAP437

The SMChms Helideck Monitoring system is as flexible as many of today’s offshore vessels. Current industry requirements may require that a vessel works in various locations around the globe. Being able to meet all of the required Code and standards applicable in different regions is of critical importance.

The SMC Helideck Monitoring System meets all of the following:

  • UK CAA CAP437 standard
  • UK HCA (Helideck Certificate Agency) Standard Helideck Monitoring Systems Rev 8 & 9
  • Norwegian Requirements CAA BSL D 5-1
  • Brazilian DPC Normam-27

Communication

Graphical Communications

Following the installation of the Helideck monitoring system software on a server PC a full software display is available using a standard Web browser User Interface format. Alternatively, a client software program is installed that can be used as a viewing option.

By standardizing on Web browser format, the SMChms software can be viewed across multiple platforms PC’s, Macs, Tablets, Smartphones and other PDU systems that are connected to the LAN/WAN that has permission to access the data. This reduces the need for additional software tools to be loaded onto multiple PC’s/Platforms. Multiple remote connections are available across the network and the number of simultaneous connected users is unlimited and not restricted by separately purchase individual user licenses.

External Data Output

The SMChms software offers multiple options for output communications connecting to external systems supplying data from the Motion sensors and Weather instruments over for example SNMP, Modbus TCP/RTU and ASCII.

Helimet

Helimet is a shared weather information tool used by the offshore oil and gas industry in the UK. A configuration enables a standard Helimet transmission for the Offshore Helicopter Weather Network.

VFC

With the installation of an optional Voltage Free Contacts card in the HMS server PC a dry voltage output signal can be generated for use with Helideck Lights and other alarm outputs. Additional VFC’s can be installed in the HMS server PC to support these functions.


Instruments

A standard for HMS Systems usually requires but is not limited to the following motion and meteorological instruments. Motion, Wind, Air Pressure, Temperature and Humidity information, Cloud height and Visibility.

Typically, the type of vessel and operational areas will determine the list of instruments required. Fixed installations, Semi Submersibles, crane and lay barges, FSU’s, large ships, drill ships, FPSO’s and jack up rigs all are required to have the full list of instruments.

Smaller vessels and vessels with less frequent helicopter operations such as DSV’s, support and seismic vessels along with tankers and super yachts require only Motion, Wind, Air Pressure, Temperature and Dew point information.

Motion Sensors

Current guidelines for the CAP437 as described in the HCA HMS v9 specification requires a Roll & Pitch accuracy of better than ±0.1°RMS over 0 – 3.5° and a Heave Rate of better than ±0.1 m/s RMS over a range of 0 to 1.3 m/s. Additionally with the new MSI Helideck Accelerations better than ±0.01 m/s² RMS in the range of 0 – 0.2 m/s² are required.

Inclination and Significant Heave Rate (SHR) are calculated within the HMS software along with the MSI Motion Severity Index.

Wind Speed and Direction

Dependent on the standard and requirements typically an instrument should be accurate to ±1kn (0.51m/s), or ±10% for wind speeds in excess of 10kn (5.1m/s) across an operating range from 0 – 100kn (0 – 51m/s). And for direction with wind speeds over 2kn (1m/s) the accuracy should be better than ±10%.

As an extra note in installations where the primary anemometer is obstructed by a vessel structure a second unit should be added at a separate location to cover any angles obstructed by the first.

Relative wind direction (RWD) and Wind Severity Index (WSI) are calculated with the HMS Software.

Air Temperature and Humidity

Dependent on the standard and requirements typically an instrument with ±1.0°C for air temperature and dew point over a Temperature range of -25°C to +50° and Humidity of 5 – 100% relative humidity condensing.

Any instruments should be exposed in an instrument housing radiation shield or Stevenson screen as close to the helideck as possible away from exhausts or building heating.

Barometric Pressure

Typically depending on the standard two co-located pressure sensors that are accurate to within 0.5 Hectopascal of each other with a ±0.5 Hectopascal minimum accuracy should be used. These should have an intolerance range of 900 – 1050hPa.

QNH and QFE data is set up within the HMS software.

Visibility and Present Weather

Visibility distances of up to 10km should be displayed along with a selection of present weather phenomena that are detailed in CAP437 E7 & CAP 746 (Chapter 4) need to be reported. Examples such as Thunderstorms, Rain and type, Snow and Ice along with Fog.

Cloud Height

Cloud is to be reported as laid out in CAP437 E.9 & CAP 746 (Chapter 4), examples would be: FEW, SCT, BKN, OVC along with additional cloud type and heights up to 5000ft unless Cumulonimbus (CB) or Towering Cumulus (TCU) clouds are present.

Wave Height

If a wave height sensor has been installed measurements of significant wave height should be displayed.

Gyrocompass

A vessels heading is required to show Magnetic North and corresponding compass directions. A Compass display showing vessel heading as well as being used to calculate the True Wind data.

GPS

Vessel Position data is displayed within the HMS software and is also recorded for Pre-Flight reports and Data logging. The GPS position data is also used to calculate True Wind Data.