Guidlines for "Jockey" Pumps design

[Rireva]

Hello everybody, have a nice day.

Please if somebody knows whether a pair of pressure maintenance pump ("Jockey" pumps) in offshore installations (platforms), in the arrangement main and backup without hydro-pneumatic tank, should go with only one controller for both pumps or should go with two controllers (one for each)? And where do I find the text related to it? I have to say that I have read the NFPA 20 and doesn't explain the matter very good.

If somebody knows I would appreciate very much.

Gracias por la ayuda.

[nhsoraya92]

i think this book could help: Fire Fighting Pumping Systems at Industrial Facilities (Dennis P. Nolan). http(://)www(.)scribd(.)com/doc/86549632/Fire-Fighting-Pumping-Systems-at-Industrial-Facilities

imo, since "jockey" pump is not a main protection, and only a "back-up" protection, it's not necessary to install two controllers for both main and jockey pump. an on and off switch would be governing. cmiiw.

copy paste from the book:
In order for jockey pumps to perform as pressure maintenance pumps, a method of instrumentation and control is required, therefore, a pump “controller” is required for jockey pumps. In some instances a jockey pump may be arranged to continually operate and in these cases a controller mechanism is not required, only an on and off switch. Because water supply from jockey pumps is not critical, a listed or approved controller for firewater pump service is not normally required. Controllers for jockey pump service are available that are built to and have been listed to UL 508, Standard for Industrial Controls. Jockey pump controllers activate from pressure switch inputs. The pressure switch should be located on the system side (i.e., downstream) of the firewater pumps.

cmiiw.

[Rireva]

Thanks nhsoraya92 very helpful. I'm checking the text but I could'n get any copy of it.
Just as some additional information we actually submit the design with one controller for the pumps and the text give me a strong argument for that matter.
See ya.
Rireva
PD. If you know some link for the text would you mind to share, thanks in advance.

[nhsoraya92]

PM me your email and i'll send it to you later on. or you can just google the book and you'll find the scribd link easily.

[Rireva]

Hi, for some reason I don´t know the administrator doesn't allow me to replay, eliminating all of them when I try to put my mail on it. Recently I saw this way to do it. Regards, and if you send me the bibliography I would be great. Thanx. email "reydereyes26@yahoo.com.mx".

[inesse]

it's possible to put 2 pump jockey at the same time with deference of pressure .the first work from 2to 5 bar and the second from 5 to 9