Looking at ways to bring LNG to Maharashtra

Vol 9, PW 15 (03 Nov 05) Midstream & Downstream
     

ISPAT is not idling away its time waiting for GAILs pipeline to happen.

It knows that a pipeline from Hazira to Uran and then to Dolvi is the best and most economical way to transport Shells LNG to its 4.2m t/y steel factory. But aware of GAILs difficulties, ISPAT has hired two consultants to compile detailed reports on alternative options in the absence of a pipeline: Enersea of Houston and Uhde of India.

Both consultants are expected to submit their reports sometime in November. ISPAT is considering two possibilities to bring in gas: either as LNG or as Compressed Natural Gas.

Under the first, LNG will be drawn directly from the Hazira terminal into cryogenic tanks mounted on trucks. These trucks will then roll on to a barge for the 12-hour sea voyage to the ISPAT jetty at Dharamtar 400-km south of Hazira.

Each barge can carry 20 cryogenic tanker trucks. At Dharamtar, the trucks will roll off and head for the ISPAT factory, where they will discharge the LNG into vaporisers (regassifying units) from where the gas will be sent at 10-bar pressure to the ISPAT steel factory.

Preliminary estimates are that ISPAT will bring in two barges per day carrying a total 500,000 cm/d. ISPAT might eventually have to set up onshore tanks to store the LNG.

Another option is to bring in the gas as CNG, in storage bullets or giant tanker ships. Under this option regassified LNG from Hazira will be filled into tankers where the gas will be compressed.

Regassified LNG can also be compressed on a barge and then filled into bullet containers, which can be stacked on the barge for the voyage to Dharamtar. Each barge can transport 150,000 cm/d CNG.

If ISPAT decides on CNG it will bring in two barges a day, totalling 300, 000 cm/d. Once the CNG lands at Dharamtar, it will be transported by pipeline at 10-bar pressure straight to the ISPAT factory.