Mooring configuration

  The configuration of the PHSMO is shown in Fig.1. The specifications of buoy parts are given in Table 1. We adopted slack-line type mooring(the mooring line is longer than water depth) to reduce the tension along the mooring line (Fig.1). Thus, we can use smaller size parts such as surface float, shackles, chains, and anchor(Table 1), and make total system small, light with less construction and maintenance costs.

Table 1: PHSMO parts specifications

Surface float	diameter	1.8 m
	weight	800 kg
	buoyancy	3000 kg
Mooring line
wire cable	diameter	15 mm
	others	length 520 m
nylon rope	diameter	17 mm
	others	length depends on depth
polypropylene rope	diameter	19 mm
	others	length depends on depth
Underwater float for recovery	diameter	0.4 m (sphere) x 12
	weight	17.7 kg x 12
	buoyancy	25.4 kg x 12
	material	glass
Releaser	style	double acoustic releasers
Anchor	weight	3500 kg (in air)
Data transmission	under water	Inductive coupling data communication system
	satellite	Iridium Satellite Communications

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Contact:
Dr. Iwao Ueki
E-mail uekii [at] jamstec.go.jp