Skid-mounted Unit - Jimmy Lea

The relevant design codes and Australian Standards applied in this modular plant design were:

- Electrical performance according to EN60034-1
- Hydraulic performance according to ISO9906
- Mechanical seal according to 12756 & ISO 3069
- International protection marking, IP Code IEC standard 60529

Skid & Ladder
- AS 4100:1998 Steel structures
- AS 1657:2018 Fixed platforms, walkways, stairways and ladders -

  Design, construction and installation
- AS 1170:2007 Structural design actions
- AS 1554:2004 Structural steel welding

- AS 1692:2006 Steel tanks for flammable & combustible liquids

- AS 2129:2000 Flanges for pipes, valves and fittings
- AS 4130:2009 Polyethylene (PE) pipes for pressure application
- AS NZS 2033:2008 Installation of polyethylene pipe systems
- AS 4041:2006 Pressure piping
- AS 1345:1995 Identification of the contents of pipes conduits and


IP Rating
- AS 1939:1990 Degrees of protection provided by enclosures for

  electrical equipment (IP Code)

- AS IEC 61882:2003 Hazard and operability studies (HAZOP studies)

  Application guide

- AS 1100.101:1992 Technical drawing - General principles
- AS 1100.201:1992 Technical drawing part 201 Mechanical

  engineering drawing

Modular Design & Fabrication - Jimmy Lea
Modular Design & Fabrication - Jimmy Lea
Modular Design & Fabrication - Jimmy Lea
Skid-mounted Unit - Jimmy Lea

Jimmy Lea, being one of the few simulation-based engineering design firms, provides modular design & fabrication of an effective and efficient skid-mounted ballast water treatment system (BWTS). Our system focuses on filter units + UV photoreactor because these technologies are:

(1) inherently safe and simple to operate
(2) does not require chemicals
(3) does not create any carcinogenic by-products and
(4) unaffected by salinity, temperature, pH or organic loading.

We differentiate ourselves from other engineering firms in the sense that all our designs are supported by in-house simulation technologies to ensure effective & efficient systems. We customise our BWTS to suit whatever flow rates required. Our system will ensure ship operators meet IMO Regulations D-2 ballast water discharge limits. 

Skid-mounted Unit - Jimmy Lea

One of the modular plant design projects which our consulting engineers delivered involved designing a modular unit which consisted of a stainless steel tank, skid structure and ladder. This modular design also consists of pumps, instrumentation and process control, pipe and fittings. The project started off by developing the design basis and then completing the process engineering design and mechanical engineering design components.

Process engineering design

- pipe sizing

- calculating pressure drop by simulation

- multiphase process calculations

- selecting and sizing valves

- selecting and sizing instrumentation

- developing the functional specification for process control

- computational fluid dynamics (CFD) multiphase simulations

Mechanical engineering design

- mechanical design of tank, skid structure and ladder

- mechanical stress calculations

- specifying nozzles and appropriate flanges

- pipe material and schedule selection

- pipe fittings selection

- pipe routing

- developing the layout

- finite element analysis (FEA) structural simulations

Skid-mounted Unit - Jimmy Lea
Skid-mounted Unit - Jimmy Lea
Skid-mounted Unit - Jimmy Lea


​​​Modular Plant Design Firm

Since the introduction of steel-hulled vessels around 120 years ago, water has been used as ballast to stabilise vessels at sea. Ballast water is pumped in to maintain safe operating conditions throughout a voyage. This practice reduces stress on the hull, provides transverse stability, improves propulsion and manoeuvrability, and compensates for weight changes in various cargo load levels and due to fuel and water consumption. Whilst ballast water is important, the uptake and discharge cycles may pose serious problems to the marine ecosystem due to the swapping of microorganisms which include bacteria, microbes, small invertebrates, eggs, cysts and larvae of various species. The transferred species may survive to establish a reproductive population in the host environment, becoming invasive, out-competing native species and multiplying into pest proportions. To resolve this issue, the international maritime organisation (IMO) launched the Ballast Water Management Convention in 2004 effective on 8 September 2017. The convention which was ratified by 30 states that represented 35% of the world’s merchant shipping tonnage, stated that ballast water must be treated to IMO Regulations D-2 discharge limits before it can be discharged. As an engineering design firm, we will support our client in the shipping industry to meet these requirements through modular design & fabrication.

IMO Regulations D-2 specifies that:
For organisms larger or equal to 50micron, vessels can only discharge less than 10 viable organisms/m3.
For organisms smaller than 50micron but larger or equal to 10 micron, vessels can only discharge 10 viable organisms/mL.
For organisms smaller than 10micron, specific concentrations are provided for each microbe.