Old joke, but hopefully no longer with any merits 
No it is NOT “good enough” A lot of factors decides how much pulling (or pushing) power you get from a given engine size.
The engine configuration, hull shape and most of all the type of propulsion (fixed pitch or CCP? Open or with nozzles?
The rule is therefore that a Bollard Pull certificate not more that 5 years old and based on a static pull test, carried out according to a sett of rules, (incl. min. water depth, max. wind force and cross current etc.) measured by a certified and calibrated loadcell and witnessed by a competent person from an approved organization (Class, MWS, Maritime Authorities)
Static BP is different from the pull force actually asserted on the towline during towing (Dynamic BP).
Modern towing vessels are equipped with load cell(s) on the towing winch.
This load can be watched in real time on the bridge and an alarm can be set to alert when the pull exceed predetermined parameter. This can be set based on SWL of the towing line, tow connection on the towed object, or whatever the MWS has set as the max, allowed in the CofA.
All you want to know about Bollard Pull:
PS> I have not proofread the entire article.
BP test carried out on a powerful AHT:
