Clarke FG2000 Especificaciones descargar pdf (Pagina 3)

Boil-out Gage Practice and Policy

On new boiler installations, it is common procedure to initially operate the boiler at a reduced

pressure for a short time to ‘cook out’ foreign materials (pipe joint compound, grease, oil, flux,

etc.) that remain in the drum or other pressurized parts of the system after the boiler has been

constructed. During this boil-out period, most of the suspended or dissolved debris is flushed

out with blow-down discharges. However, a small amount of residue is unavoidably deposited

as a film on all internal wetted surfaces… including those of the water gage glass. This type of

scum layer is nearly impossible to remove by blowing down the gage glass, particularly if the

gage glasses are protected by mica shields, as they must be, in high pressure installations.

As a practical matter, it is more expedient to employ an inexpensive temporary level gage,

which can be discarded or returned after the boil-out procedure, rather than to use then rebuild

the gage glass intended for regular service. For boil-out purposes on new water columns, Clark-

Reliance provides a temporary level gage at no charge, or at a refundable charge, under one of

the following conditions:

1) When a Prismatic, Flat Glass, or Simpliport gage having ¾” O.D. end nipples is supplied as

part of a water column, and the boil-out pressure will not exceed 200 PSIG, Clark-Reliance

automatically will furnish for temporary boil-out service the following parts at no charge:

1 pc. – ¾” O.D. tubular glass gage cut to the proper length

2 pcs. – Rubber packing rings (*)

1 pc. – Low visibility shield (so that low vision in the tubular glass gage is the same as in the

gage glass that will be used for regular service).

At the conclusion of the boil-out procedure, all of the above parts should be discarded. When

the gage having stainless steel nipples is installed, it is essential that the appropriate (non-

rubber) packing rings are used, to assure durable sealing of the stainless steel nipples.

2) When a gage glass having flanged connections is supplied as part of a water column, and

the boil-out pressure will not exceed 200 PSIG, Clark-Reliance will furnish the following parts at

no charge:

1 set – VB991 gage valves with ½” MNPT connections

1 pc. 5/8” O.D. tubular glass gage cut to the proper length

1 pc. – Low visibility shield.

The boil-out gage valves should be temporarily installed in the ½” FNPT “Test” connections in

the flanges of the regular water gage shut-off valves, which are on the water column. This

equipment may be discarded after the boil-out has been completed.

3) On installations like the above, but where the boil-out pressure will exceed 200 PSIG, consult

Clark-Reliance to discuss options for an appropriate temporary use gage and valves. The cost

of this assembly will be listed separately on our order invoice. However, full credit will be issued

upon its return to Clark-Reliance.

* Bronze valves are supplied with rubber packing rings. These are to be used for the boil-out procedure. Steel valves are supplied

with packing cartridges and separate rubber packing rings (to beused for boil-out).

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Clarke FG2000 Especificaciones Pagina 3