Acronym help please!
Acronym help please!
(OP)
I have a 'Compressor Cylinder Engineering Information' sheet on one of our 2 stage IR recips.
Information listed includes:
1st Stage 2nd Stage
Inlet press 256PSI 524PSI
Inlet Temp 124F 120F
Dis press 531PSI 1090PSI
Dis Temp 221F 222F
RDP/HTP 585/1288 1150/2530
The last row has me stumped. RDP must be *something* Discharge Pressure, HTP - Hydrostatic Test Pressure?
The information is going on the equipment database, so I'd like to capture as much relevant information as possible but I don't want to make guesses.
Thanks in advance.
Lew
Information listed includes:
1st Stage 2nd Stage
Inlet press 256PSI 524PSI
Inlet Temp 124F 120F
Dis press 531PSI 1090PSI
Dis Temp 221F 222F
RDP/HTP 585/1288 1150/2530
The last row has me stumped. RDP must be *something* Discharge Pressure, HTP - Hydrostatic Test Pressure?
The information is going on the equipment database, so I'd like to capture as much relevant information as possible but I don't want to make guesses.
Thanks in advance.
Lew





RE: Acronym help please!
I'm in complete agreement with you. If you are at the point of entering this information into your database and can't confirm the manufacturer's use of the acronyms, then call Dresser and obtain their confirmation that:
RDP = Running Design Pressure
HTP = Hydrostatic Test Pressure
-- which would be my guess. But I would not store any "guesses" in something as important as your database. I've operated well over 50 IR reciprocating compressors in my career and I've never run into those acronyms. They must have come up with new ones.
By the way, while you are talking with Dresser, get the official, documented pressure/temperature ratings of the cast iron flanges on each one of your cylinders. This question came up in one of the forums and it is a practical need that an operator must have available -as in a database- for identifying his piping specs and "breaks" as well as the MAWP of the piping and any PSV.
Good luck!
RE: Acronym help please!
Could the R mean rated ?
Lewtam, would you satisfy our curiosity ?
RE: Acronym help please!
However, I cannot imagine HTP being the hydrotest pressure. This would be a hydro at well over 2.0 times the RDP. This is a bit strange
Chris Foley
Midland, TX
RE: Acronym help please!
corporation's specifications.
Their URL is www.ariel.com
RE: Acronym help please!
David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
The harder I work, the luckier I seem
RE: Acronym help please!
I cannot remember if this also appears in API618.
Chris Foley
Midland, TX
RE: Acronym help please!
RE: Acronym help please!
you say; ''why they chose to add a new acronym that seems to be synonymous with MAWP or MAOP'', I don't think so they use synonymous words.
If you use Ariel's performance program, you can reach Application manual via internet or on your computer, they say in the application manual;
''Rated Discharge Pressure is derived from the Maximum Allowable Working Pressure based on the following table, per API 11P and API-618.
MAWP 0-275 psig, 275 and up
RDP MAWP-25 psig, MAWP/1.1
The RDP of a cylinder is a guideline for limiting the cylinder discharge pressure. Cylinders may be operated above the RDP provided a pressure relief valve is selected to protect the cylinder from ever exceeding the MAWP.''
RE: Acronym help please!
Thanks for explaining that the compressor manufactureres didn't "come up" with this term except through their participatation on API committees.
I still wonder, with all of the safety factors in MAWP what does an additional -10% factor really do for them?
David
David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
The harder I work, the luckier I seem
RE: Acronym help please!
I have often wondered about this myself.
Chris Foley
RE: Acronym help please!
HTP does stand for Hydrostatic Test Pressure, the unit in question is 25 years old and was originally manufactured for higher discharge pressures (860psi/1670psi), but was de-rated after the original owner changed plant process. The company in charge of the retrofit didn't do a thorough job of the paperwork.
Despite this happening 18 years ago, the old dog knew it straight off the top of his head. I'm having trouble remembering what I had for breakfast.
Lew