Been ask to renew on the LNG Plant:
1. the old LNG pumps for a new model(more capacity and rpm). Which brand is the best
2. the old valves (remote and hand operated). Which brand is the best (cost/reliability)
How much at what head and what temperature (more rpm???????)? Intermittent or continuous operation? Spared or non-spared? Submerged or pipeline or, or or....
I do not have much of knowledge about LNG valve but LNG pump.
First of all, liquid LNG is nothing but very low temperature service. It is cryogenic service. In the market, there are more than 10 vendors that can supply cryogenic service pump.
Technically, nothing special because no corrosion is anticipated. The only point you need to take care is again low temperature service. That limit the material selection and hardness also.
If you stay in Amerian area, you may contact Flowserve, Goulds. In Asian area, Ebara, SHN and many. In Eropean area, KSB, Sulzer and many.
Remember one thing, your pump agency location does not always match pump manufacturing location. For example, if you order to KSB, then they can make it in Germany, India and Brazil based on order amount.
I suppose the valve is the same situation. You may first contact the existing valve supplier for renewal or new valve