Thanks Mike and Joe for your input. I am reviewing design of another company, not doing design myself. If I was doing it I would always consider it and if I decide to ignore, I will add my reasoning for ignoring it.
But when you are commenting on someone's design you have to be more careful...
When designing any pr. vessel we consider additional pressure due to static head which is a normal practice in design and also a requirement by the CODE. However sometimes, if the static head is low it is ignored by few designers. Does anyone know what the criteria or thumb rule can be used when...
Thanks friends for your input. Just to mention these two pumps are working fine for last twenty years. However we are now considering to connect the suction lines of these two pumps to add redundancy in our operation. In our present configuration we have ecc. reducer 6 x 4" just before the...
Thanks for your suggestions. I know ideal configuration is 7-8D OR atleast 5 dia. This is again debatable.This 5D is 5 times the dia of nozzle or dia of suction pipe??? In most of the cases suction pipe is larger than suction nozzle.
And secondally in cases where 5D is not practical, what sort...
We have two identical centrifugal pumps (same model,size 4x3x10; 4" suction, 3" discharge)installed in our power plant. Suction line is 6". We intend to interconnect the suction lines (6") of the two pumps for redundancy in our operation. Because of the space restriction we are considering to...
You are right, Lane. Normally stop valve is provided by the boiler supplier particularly in case of rental boiler. But this case is different. Somehow someone from our side placed wrong order (300#). When we (design) were told to support the installation, we raised all concerns. Supplier...
Thanks Lane for your advise.
Yes that is we have decided now after discussing with the boiler supplier. To keep the boiler registered as 300 psi and design the piping with additional RVs at 150 psig with full capacity (based on the maximum steaming capacity at 150 psig).
We intend to provide...
Thanks Unclesyd
Yes the nozzle is flanged.
We will get the approval from the jurisdictional authority (CNSC and TSSA)before installing the boiler.
Proposal is to put a Tee on the nozzle so that the RV can be installed in vertical direction. On the branch side of the tee stop valve will be...
Friends,
We have recd. a rental boiler for emergency heating steam requirements during the winter period. Boiler supplied is 300 psig rating and our existing system is 150 psig. Vender has offered to put a relief valve @150 psig on the steam outlet nozzle before the stop valve by providing a...
Thanks unclesyd for responding.
De-rating the boiler to 150 psi was the first option we thought of but since that requires re-registration we are trying to avoid that.
Two PSVs @300 will stay. Additional RV at 150 is to protect the existing system.
The boiler is oil fired (start up with...
Freinds,
Is it acceptable to put a relief valve on the main steam outlet nozzle. We have a rental boiler for emergency heating steam requirements during the winter period. Boiler supplied is 300 psig rating and our existing system is 150 psig. Vender has offered to put a relief valve @150 psig...
