Sullair 3700 - Page 54

To Next Page

To Previous Page

3000P-4500 USER MANUAL SECTION 4

Table 4-3: WATER TESTS

SEAWATER-COOLED UNITS

Water cleanliness is critical for operation of the

compressor. A strainer must be installed in the inlet

piping of the water system. It is also recommended

that a solenoid valve (normally closed) be installed

into the water outlet side of the compressor system.

Consult the Sullair Service Department for

assistance in setting up these recommended

precautionary functions. In addition, be aware that

cleaning of coolers as a result of fouling is a

customer responsibility.

Isolation valves with side drains should be installed

on both the inlet and outlet lines.

The recommended flow rate cannot be exceeded. An

orifice plate must be installed in the pipe-work at

least 3.3 ft (1 m) before the cooler. The orifice size

must be calculated to ensure that the maximum

seawater flow rate cannot be exceeded. Without

these precautions, the seawater flow rate through the

cooler may be several times the recommended

maximum, which will lead to rapid system failure.

No oil cooler manufacturer can guarantee that its

products will have an indefinite life and for this

reason, we suggest that the cooling system be

designed to minimize any damage caused by oil

cooler leaking. This can be achieved as follows:

1. The oil pressure should be maintained at a

pressure higher than the seawater pressure.

In the event of a leak occurring, the oil will be

prevented from becoming contaminated.

2. When the hydraulic system is not in use, the

coolers should be isolated from incoming

seawater under pressure.

3. The seawater outlet pipe from the cooler

should have an open run to waste piping.

OUTDOOR INSTALLATION (SHELTERED)

Many times a compressor must be installed outside

due to available space or other jobsite conditions.

When this is necessary, there are certain items that

should be incorporated into the system to help

ensure trouble-free operation. The unit must be

purchased with a TEFC motor. The standard

machine has NEMA 4 rated controls, which are

watertight.

Substances Test Interval Acceptable Concentration

Corrosivity Hardness, pH, Total Dissolved-

Solids, Temperature at inlet, Alkalinity

Monthly-if stable for 3 to 4 months,

analyze quarterly.

Langerlier Index 0 to 1

Iron Monthly <2ppm

Sulphate Monthly <50 ppm

Chloride Monthly <50 ppm

Nitrate Monthly <2 ppm

Silica Monthly <100 ppm

Desolated Oxygen Daily-if stable, analyze weekly 0 ppm (as low as possible)

Oil & Grease Monthly <5 ppm

Ammonia Monthly <1 ppm

NOTE

If seawater is to be used for cooling,

optional copper-nickel coolers must be

selected.

Seawater pressure

psi (bar)

Orifice diameter in inch

(mm) to give a maximum

seawater flow or 40 US

gal/min (152 l/min)

25 (1.7) 0.675 (17)

35 (2.4) 0.62 (16)

45 (3.1) 0.58 (15)

55 (3.8) 0.55 (14)

65 (4.5) 0.53 (13.5)

75 (5.2) 0.51 (13)