Emerson CS400 Arkusz Danych Pobierz pdf (Strona 11)

Bulletin 71.1:CS400

Installation

The CS400 Series regulators may be installed in any

position. However, the spring case vent should be

pointed downward. If gas escaping through the

CS400 Series internal relief valve could constitute a

hazard, the spring case vent must be piped to a location

where escaping gas will not be hazardous. If the vented

gas will be piped to another location, use obstruction-free

tubing or piping at least equal in size to the vent and the

end of the vent pipe must be protected from anything

that might clog it. Regulators with External Registration

require the use of an external control line.

Downstream Control Line Connection

A CS400 Series regulator with an EN, ET or ER in the

type number has a blocked throat, an O-ring stem seal

and a 3/4 NPT control line tapping in the lower diaphragm

casing, Figure 5. A regulator with a downstream

control line is used for monitoring installations or other

applications where there are other equipment installed

between the regulator and the pressure control point.

The O-ring stem seal helps separate body pressure

from diaphragm case pressure on monitor installations

where leakage cannot be tolerated.



The CS400 Series regulators have outlet pressure

ratings that are lower than their inlet pressure

ratings. A pressure relieving or pressure limiting

device is needed for Types CS400IN, CS400IT,

CP400EN and CS400ET if inlet pressure can exceed

the outlet pressure rating as these regulators do not

have standard internal relief, high outlet pressure

shutoff or integral slam-shut module. Optional

internal relief constructions are available and

denoted by the last letter of the Type Number sufx

and are dened in the following paragraphs.

Overpressuring any portion of a regulator or associated

equipment may cause personal injury, leakage or

property damage due to bursting of pressure-containing

parts or explosion of accumulated gas. Provide

appropriate pressure relieving or pressure limiting

devices to ensure that the limits in the Specications

section are not exceeded. Regulator operation within

ratings does not prevent the possibility of damage from

external sources or from debris in the pipeline.



Type numbers with the “R” sufx, e.g. Type CS400IR,

provide internal relief discharge across the diaphragm

assembly (Figure 4) to minimize overpressure. Any

outlet pressure above the start-to-discharge point of the

non-adjustable relief spring moves the diaphragm off

the relief seat, allowing excess pressure to discharge

through the vent. If emergency conditions should exist

that prevent normal operation of the regulator or internal

relief valve, the relief valve stem acts as a secondary

travel stop contacting the underside of the closing

cap and stopping the upward travel of the relief seat.

Since the diaphragm continues to rise as downstream

pressure builds, the diaphragm lifts off of the relief seat

to provide relief operation. The secondary travel stop for

internal relief is not available on token relieving units.

See Figures 10, 11, 12, 13 and 14 for relief capacity.



Type numbers with the “T” sufx, e.g. Type CS400IT,

provide low capacity/token internal relief. Token relief

provides relief only from minor overpressure caused

by nicks or dents on the orice or disk or by thermal

expansion of gas in the downstream line. Token relief

also provides a token or signal, in the form of odor,

that an overpressure situation is occurring. Start-to-

discharge values of the Token relief are consistent with

the Internal relief values found in Table 4.



Type numbers with the “N” sufx, e.g. Type CS400IN,

do NOT provide internal relief discharge across the

diaphragm assembly.

Integral True-Monitor™ Protection

Types CS403IN, CS403EN, CS403IT and CS403ET

combine the operation of a conventional two-regulator

wide-open monitor set into one body. The Integral True-

Monitor is installed on the inlet side of the body and serves

to throttle ow and maintain an acceptable downstream

pressure in the case where the primary regulator fails

to regulate. Unlike multiple seat designs that rely on the

primary regulator for all protection against loss of pressure

control modes, the CS403 Series provides protection from

a wide variety of conditions that could cause the primary

regulator not to regulate downstream pressure.

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Reducing Regulators 1
Bulletin 71.1:CS400 10

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