There is more to the design of a measurement facility than the word measurement suggests. Generally, measurement arena may include any or all of the following
1) Metering
2) Control
3) Gas quality
4) Others (Filtration, Odorization etc.)
The attached paper describes important factors to consider ...

A good presentation on basics of PSVs ...

1) Essentials of health and safety at work
Overview
The book explains what the law requires and helps employers put it into practice. Chapter 1 suggests how to tackle the basics of health and safety, also how to identify, assess and control the activities that might cause harm in a business ...

I would suggest following literature
1) ICI Catalyst Handbook
2) Reducing Energy while maintaining reliability in Ammonia plant - AIChE Ammonia Symposium Paper 1980
3) Advanced control & optimization applications in ammonia plant - AIChE Ammonia Symposium Paper 1991
4) Modern Techniques for ...

Excellent sharing

Attached is a quick data guide for engineers containing properties of selected compounds and other useful information.
Some of the contents in the guide are,
Unit Conversion Factors
Viscosity Data
Speeds of sound
Pipe Data
Di-electric constants
Density & Specific Gravity etc...

Further details on

https://www.npcc.ae/ATS_NET/Vacancies/frmVacancies.aspx

Further details on

http://www.orpc.co.om/disCareers.aspx?Dep=1

Further details available at

http://www.sipchem-careers.com/

Life depends on material of construction of your basket which may vary from case to case even in same configuration. There is more into it than just life, as with S-300 you will achieve same production level at relatively lower synthesis loop pressure so there is definitely some economic benefit ...