Ravva - Cairn’s first development success story has been the bedrock of innovation, and the foundation of our success story in the country and the region. Ravva, which in Sanskrit and Telegu means “diamond” showcases the journey of growth that Cairn has been able to achieve in its business. Incidentally, Ravva is the only field in India to get such a unique name indicating the belief of the nation in it.

1.
RAVVA
Celebrating 16 Years of Technical Excellence
Satellite Gas Development Project

2. RAVVA – Celebrating 16 years of Technical Excellence
Pioneering Development
Ravva Satellite Gas Development Project
As part of the Ravva Satellite Gas Development Project (RSGDP) in 2001, Cairn installed new gas
treatment facilities at Ravva Terminal (RT) & one offshore platform (RH). The new facilities process gas
from new gas wellheads on RD, RH and RF platforms, and from the existing wellheads on the RG
platform.
New Gas Compression, Dew Point Control, MEG
Regeneration and Custody Transfer facilities are provided
onshore, and are tied into the existing slug catching and
receiving facilities as part of the project.
Hydrocarbon dew point (HDP) is similar to the water dew
point issue, except that there is a multi-component system.
Natural gas typically contains many liquid hydrocarbon
components with the heavier components found in smaller
amounts than the lighter gaseous ends. It is the heaviest
components that first condense and define the hydrocarbon
dew point temperature of the gas. The dew point temperature
also varies in relation to the pressure.
Mono Ethylene Glycol solution (MEG) is injected at the
upstream of gas/gas exchangers as hydrate formation
inhibitor. Corrosion inhibitor with other chemicals (i.e. Amine,
etc.), are injected in the sub-sea lines between the offshore
platforms and the onshore receiving facilities.
Installation of a new water injection pipeline from RT to the
existing RC platform was also included in the RSGDP
upgrades.
All RSGDP facilities were installed in a dedicated area within the existing RT Plant, except for the new
Gas Pig Receiver and Water Injection launcher, which were located in the existing pig launching/receiving
area. The new facilities included:
 Gas receiving and processing facilities
 Local Control Room - Located in a safe area within RSGDP facilities
 Compressor House - Accommodates the new gas engine driven compressors
 MCC Room
 New High Pressure flare tip
 Water Injection Launcher
A new pig receiver has been provided at RT Onshore Terminal for the incoming gas from RH. Gas arriving
from RH Platform is tied into the existing Slug Catcher RT-V-301 downstream of the pig receiver. The
Slug Catcher also receives gas from the existing RG Platform.
Liquid from the Slug Catcher flows to the existing Crude Stabilisation System. Gas from the Slug Catcher
can either flow to the compression trains or bypass them.
Three reciprocating compression trains with a capacity of 0.55 MMSCMD each driven by ‘Waukesha’ gas
engine were provided. Gas from compression (or its bypass) flows to the Dew Point Control Package.
The Dew Point Control Package comprises Gas/Gas Exchanger and Propane Refrigeration Unit. Gas is
pre-cooled by exchanging heat with the cold gas in the Gas/Gas Exchanger, followed by further cooling to

3. RAVVA – Celebrating 16 years of Technical Excellence
Pioneering Development
-5o C in the Propane Chiller. MEG is injected into the tube sheets of Gas/Gas Exchanger and Propane
Chiller to prevent hydrate formation and corrosion in these exchangers.
Gas from the Propane Chiller flows to the Low Temperature Separator (LTS), where the gas rich MEG
and condensate are separated. Gas from the LTS is routed to the Gas Exchanger where it exchanges
heat with the warm, untreated gas. Rich MEG is sent to the MEG Regeneration Package and condensate
is directed to the existing Crude Stabilisation system.
Rich glycol from the Low Temperature Separator flows to the MEG Regeneration Package, where MEG is
reconcentrated by boiling off the absorbed water and then routed back to DPCU.
Treated gas from the Gas/Gas Exchanger flows to the Sales Gas Metering Skid. This skid contains
2x100% orifice meter runs and a Dew Point Analyser.
A back-pressure control valve maintains the pressure upstream of the meter runs at 7453 kPa(g). The
natural gas after metering is exported to the GAIL Pipeline.