Question

#3

a) What is a transportable gas? What is a salable gas? What three situations motivate maximization of condensate recovery?

b) What is "LET"? Under what condition may water removal not be absolutely necessary? Under what condition may gas exhibit hydrocarbon condensation in the pipeline? If we have condensates, what three alternative procedures can be adopted?

Answer 1

a)natural gas which is liquified and stored in the gas cylinders which can be transportable.Natural gas marketed under controlled quality conditions is a salable gas.

some sources for more info

https://www.academia.edu/5220517/CHEG481_Gas_Processing_Engineering._Spring_2012

http://www.hse.gov.uk/foi/internalops/ocs/300-399/308_13.htm

This OC provides advice on the design aspects of the Pressure Systems and Transportable Gas Containers (PSTGC) Regulations. These aspects of the Regulations (Regs 4 – 7) are relevant only for pressure equipment placed on the market before the Pressure Systems Safety Regulations 2000 came into force, since the design requirements of PSSR are not retrospective.  

Introduction

1 The PSTGC Regulations came fully into force on 1 July 1994. On 1 September 1996, the Carriage of Dangerous Goods (Classification, Packaging and Labelling) and Use of Transportable Pressure Receptacles Regulations 1996 (CDGCPL) revoked Part V of the PSTGC Regulations which covered transportable gas containers (now called transportable pressure receptacles (TPRs)). The requirements for TPRs are now covered by CDGCPL 2009 (as amended).

Background

2 The PSTGC Regulations have been revoked and replaced by PSSR 2000. This OC provides advice on the design aspects of the Pressure Systems and Transportable Gas Containers (PSTGC) Regulations. These aspects of the Regulations (Regs 4 – 7) are relevant only for pressure equipment placed on the market before the Pressure Systems Safety Regulations 2000 came into force, since the design requirements of PSSR are not retrospective.

3 The Simple Pressure Vessels (Safety) Regulations (SPVR) 1991, as amended, are concerned with the manufacture and supply of new welded pressure vessels containing air or nitrogen at a pressure greater than 0.5 bar but less than 30 bar. The SPVR are more limited in their scope than PSSR, as well as being primarily concerned with the initial integrity of vessels rather than their safe use. Manufacturers must, however, provide instructions which cover maintenance and installation for vessel safety. Further guidance on the application and enforcement of the SPVR is in the FOD guide to the inspection of the manufacture and supply of products and substances(chapter 4.2).

Regulation 2 - Interpretation

Pressure system

4 The definition in reg.2 of the PSTGC Regulations has 3 clauses: (a), (b) and (c) which should be read as alternatives. As a consequence of CDGCPL, definition (b) of a pressure system has been amended to read:
'....the pipework with its protective devices to which a transportable pressure receptacle is, or is intended to be, connected; '.

Regulaton 3 - Application and duties

Application and exceptions

5 The PSTGC Regulations apply to pressure systems, as defined, which are used or intended to be used at work. Equipment solely used in domestic premises is not covered. Commentary on particular exceptions is contained inAppendix 1.