DriSteem Vapor-Logic Instalační příručka stáhnout pdf (Strana 30)

Page 28 • DRI-STEEM GTS Humidifier Installation, Operation, and Maintenance Manual

Example

For this example, refer to the tables on the previous page.

To determine gas piping size, begin by calculating the cubic

feet/hour (ft

/hr) or m

/hr using the following formula:

Btuh (kW) input

Calorific value of gas

Calorific values are:

• Natural gas: 1025 Btu/ft

(10.6 kW-hr/m

)

• Propane: 2500 Btu/ft

(25.9 kW-hr/m

)

For example, if you have a GTS-400 operating on natural gas,

calculate the ft

/hr or m

/hr as follows:

400,000 Btuh

= 390 ft

/hr

1025 Btu/ft

117.2 kW

= 11.1 m

/hr

10.6 kW-hr/m

If you need to run your gas piping 60 feet (18 m), see Table 27-2 on

the previous page and look horizontally across the 60 ft (18 m) row

until you locate the next highest value above your calculated ft

/hr

or m

/hr. In this example, you are looking for the next highest value

above 390 ft

/hr (11.05 m

/hr), which is 400 ft

/hr (11.3 m

/hr) and

indicates the use of a 1¼" (DN32) pipe for this application.

Using the same example, if the specific gravity of your natural

gas was 0.55 (instead of the 0.60 standard), see Table 27-2 for an

adjustment factor. In this case, the factor would be 1.04, which you

multiply by the 390 ft

/hr (11.05 m

/hr) value. This gives you a new

value of 406 ft

/hr (11.49 m

/hr). Referring again to the gas pipe

capacities table (Table 27-2), you see that for the same 60 ft (18 m)

length, you now need to use 1½" (DN40) pipe due to the change in

the specific gravity of the gas.

G a s p i p i n g ( c o n t i n u e d )

Gas leak testing

• When leak-testing the gas supply piping

system, disconnect the humidifier and

its gas shutoff valve during any pressure

in excess of 24" wc (6 kPa). Isolate the

humidifier from the gas supply piping

system by closing its field-installed

manual shutoff valve during any pressure

not equal to 24" wc (6 kPa).

• With all burners running, check gas

supply pressure at the inlet pressure tap

of the combination gas control valve.

For North American models, the

recommended supply pressure is

7" wc (1.75 kPa) for natural gas or

11" wc (1.83 kPa) for LP gas. Perform

gas piping purging as described in ANSI

Z223.1 (latest edition) or in Canada, CAN/

CGA-B149 codes. The minimum supply

pressure is 6" wc (1 kPa) for natural gas

or LP gas.

For European models, the required supply

pressure is 20 or 25 mbar for natural gas

and 30, 37, or 50 mbar for propane gas.

More gas piping instructions on the next page ▶

Installation

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