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Bulletin 71.1:CP200

Type CP205 with Secondary Seat™

Protection

Refer to Figure 4. The Type CP205 provides

Secondary Seat Protection. As downstream demand

decreases and downstream pressure rises to the

regulator pressure lock-up value, the regulator will

lockup. If, however, damage has occurred to the

primary disk, to the primary orice’s seating surface, or

debris has become lodged between the primary disk

and primary orice, the outlet pressure will continue

to rise. This additional pressure causes the primary

disk to apply additional force to the orice seating

surface, which causes the Secondary seating surface

to move toward the Secondary disk or sealing surface.

If downstream demand decreases to zero, then the

secondary seating surface will contact the sealing

surface to provide lockup.

Type CP206 with Secondary Seat

Protection with Bleed

The Type CP206 provides small bleed to the

downstream system as an indication that the

Secondary Seat is providing lockup. In the event that

the primary orice and disk cannot provide lockup, the

secondary seating surface will move into contact with

a metal disk. This metal to metal interface will allow

a small amount of gas to bleed downstream thereby

increasing outlet pressure until the internal relief valve

begins to discharge gas to the atmosphere. The

odor of this discharged gas provides an indication

that the regulator is relying on the Secondary Seat for

overpressure protection.

Types CP205 and CP206

Secondary Seat Protection Limitations

Secondary Seat Protection does not provide additional

overpressure protection in the event the secondary

seating surface or disk is damaged by debris or

contamination in the pipeline or from conditions that

would cause the regulator to go wide open. When

selecting Secondary Seat Protection option, it is

recommended that:

• Other additional overpressure protection methods

be added in the downstream system as discussed

in the section on Overpressure Protection; and

• An annual downstream lock-up pressure test be

done to determine if the Secondary Seat Protection

option is operating and functional.

Installation

The CP200 Series regulators may be installed in

any position. However, the spring case vent of the

Type 67CP loading regulator should be pointed

downward. If gas escaping through Type 67CPR

pressure loading regulator token 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, obstruction-free tubing or piping at least

equal to the vent, and the end of the vent pipe must

be protected from anything that might clog it.

Overpressure Protection

The CP200 Series is an internally registered pressure

reducing regulator and has outlet pressure ratings

lower than the inlet pressure ratings. Complete

downstream overpressure protection is needed if the

actual inlet pressure exceeds the outlet pressure rating.

Token Relief

Types with a “T” in the type number, e.g., Type CP200IT

provide an optional small capacity or token relief located

in the Type 67CPR to relieve minor overpressure

caused by thermal expansion or minor nicks in the

orice or disk. Refer to Table 5 for Start-to-Discharge

Pressure Above Setpoint values.

Secondary Seat™ Protection

This overpressure protection provides lockup via a

secondary seating and disk surface in the event that

damage to the primary disk or orice seating surface,

or debris in the ow path, inhibit primary lockup.

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 is not exceeded. Regulator

operation within ratings does not prevent the possibility

of damage from external sources or from debris in the

pipeline. Refer to the relief sizing coefcients and the

Capacity Information section to determine the required

relief valve capacity.

1 2 3 4 5 6 7 8 9 10 11 12 ... 27 28

Bulletin 71.1:CP200 1

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